IABSD.fr/src/usr.bin/ssh/readconf.c

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• Author : jsg
  Date : 2024-05-17 02:39:11
  Hash : 9574f1dc
  Message : spelling; ok djm@

• usr.bin/ssh/readconf.c

• /* $OpenBSD: readconf.c,v 1.387 2024/05/17 02:39:11 jsg Exp $ */
  /*
   * Author: Tatu Ylonen <ylo@cs.hut.fi>
   * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
   *                    All rights reserved
   * Functions for reading the configuration files.
   *
   * As far as I am concerned, the code I have written for this software
   * can be used freely for any purpose.  Any derived versions of this
   * software must be clearly marked as such, and if the derived work is
   * incompatible with the protocol description in the RFC file, it must be
   * called by a name other than "ssh" or "Secure Shell".
   */
  
  #include <sys/types.h>
  #include <sys/stat.h>
  #include <sys/socket.h>
  #include <sys/wait.h>
  #include <sys/un.h>
  
  #include <net/if.h>
  #include <netinet/in.h>
  #include <netinet/ip.h>
  
  #include <ctype.h>
  #include <errno.h>
  #include <fcntl.h>
  #include <glob.h>
  #include <ifaddrs.h>
  #include <netdb.h>
  #include <paths.h>
  #include <pwd.h>
  #include <signal.h>
  #include <stdio.h>
  #include <string.h>
  #include <stdarg.h>
  #include <unistd.h>
  #include <limits.h>
  #include <util.h>
  #include <vis.h>
  
  #include "xmalloc.h"
  #include "ssh.h"
  #include "ssherr.h"
  #include "cipher.h"
  #include "pathnames.h"
  #include "log.h"
  #include "sshkey.h"
  #include "misc.h"
  #include "readconf.h"
  #include "match.h"
  #include "kex.h"
  #include "mac.h"
  #include "uidswap.h"
  #include "myproposal.h"
  #include "digest.h"
  
  /* Format of the configuration file:
  
     # Configuration data is parsed as follows:
     #  1. command line options
     #  2. user-specific file
     #  3. system-wide file
     # Any configuration value is only changed the first time it is set.
     # Thus, host-specific definitions should be at the beginning of the
     # configuration file, and defaults at the end.
  
     # Host-specific declarations.  These may override anything above.  A single
     # host may match multiple declarations; these are processed in the order
     # that they are given in.
  
     Host *.ngs.fi ngs.fi
       User foo
  
     Host fake.com
       Hostname another.host.name.real.org
       User blaah
       Port 34289
       ForwardX11 no
       ForwardAgent no
  
     Host books.com
       RemoteForward 9999 shadows.cs.hut.fi:9999
       Ciphers 3des-cbc
  
     Host fascist.blob.com
       Port 23123
       User tylonen
       PasswordAuthentication no
  
     Host puukko.hut.fi
       User t35124p
       ProxyCommand ssh-proxy %h %p
  
     Host *.fr
       PublicKeyAuthentication no
  
     Host *.su
       Ciphers aes128-ctr
       PasswordAuthentication no
  
     Host vpn.fake.com
       Tunnel yes
       TunnelDevice 3
  
     # Defaults for various options
     Host *
       ForwardAgent no
       ForwardX11 no
       PasswordAuthentication yes
       StrictHostKeyChecking yes
       TcpKeepAlive no
       IdentityFile ~/.ssh/identity
       Port 22
       EscapeChar ~
  
  */
  
  static int read_config_file_depth(const char *filename, struct passwd *pw,
      const char *host, const char *original_host, Options *options,
      int flags, int *activep, int *want_final_pass, int depth);
  static int process_config_line_depth(Options *options, struct passwd *pw,
      const char *host, const char *original_host, char *line,
      const char *filename, int linenum, int *activep, int flags,
      int *want_final_pass, int depth);
  
  /* Keyword tokens. */
  
  typedef enum {
  	oBadOption,
  	oHost, oMatch, oInclude, oTag,
  	oForwardAgent, oForwardX11, oForwardX11Trusted, oForwardX11Timeout,
  	oGatewayPorts, oExitOnForwardFailure,
  	oPasswordAuthentication,
  	oXAuthLocation,
  	oIdentityFile, oHostname, oPort, oRemoteForward, oLocalForward,
  	oPermitRemoteOpen,
  	oCertificateFile, oAddKeysToAgent, oIdentityAgent,
  	oUser, oEscapeChar, oProxyCommand,
  	oGlobalKnownHostsFile, oUserKnownHostsFile, oConnectionAttempts,
  	oBatchMode, oCheckHostIP, oStrictHostKeyChecking, oCompression,
  	oTCPKeepAlive, oNumberOfPasswordPrompts,
  	oLogFacility, oLogLevel, oLogVerbose, oCiphers, oMacs,
  	oPubkeyAuthentication,
  	oKbdInteractiveAuthentication, oKbdInteractiveDevices, oHostKeyAlias,
  	oDynamicForward, oPreferredAuthentications, oHostbasedAuthentication,
  	oHostKeyAlgorithms, oBindAddress, oBindInterface, oPKCS11Provider,
  	oClearAllForwardings, oNoHostAuthenticationForLocalhost,
  	oEnableSSHKeysign, oRekeyLimit, oVerifyHostKeyDNS, oConnectTimeout,
  	oAddressFamily, oGssAuthentication, oGssDelegateCreds,
  	oServerAliveInterval, oServerAliveCountMax, oIdentitiesOnly,
  	oSendEnv, oSetEnv, oControlPath, oControlMaster, oControlPersist,
  	oHashKnownHosts,
  	oTunnel, oTunnelDevice,
  	oLocalCommand, oPermitLocalCommand, oRemoteCommand,
  	oVisualHostKey,
  	oKexAlgorithms, oIPQoS, oRequestTTY, oSessionType, oStdinNull,
  	oForkAfterAuthentication, oIgnoreUnknown, oProxyUseFdpass,
  	oCanonicalDomains, oCanonicalizeHostname, oCanonicalizeMaxDots,
  	oCanonicalizeFallbackLocal, oCanonicalizePermittedCNAMEs,
  	oStreamLocalBindMask, oStreamLocalBindUnlink, oRevokedHostKeys,
  	oFingerprintHash, oUpdateHostkeys, oHostbasedAcceptedAlgorithms,
  	oPubkeyAcceptedAlgorithms, oCASignatureAlgorithms, oProxyJump,
  	oSecurityKeyProvider, oKnownHostsCommand, oRequiredRSASize,
  	oEnableEscapeCommandline, oObscureKeystrokeTiming, oChannelTimeout,
  	oIgnore, oIgnoredUnknownOption, oDeprecated, oUnsupported
  } OpCodes;
  
  /* Textual representations of the tokens. */
  
  static struct {
  	const char *name;
  	OpCodes opcode;
  } keywords[] = {
  	/* Deprecated options */
  	{ "protocol", oIgnore }, /* NB. silently ignored */
  	{ "cipher", oDeprecated },
  	{ "fallbacktorsh", oDeprecated },
  	{ "globalknownhostsfile2", oDeprecated },
  	{ "rhostsauthentication", oDeprecated },
  	{ "userknownhostsfile2", oDeprecated },
  	{ "useroaming", oDeprecated },
  	{ "usersh", oDeprecated },
  	{ "useprivilegedport", oDeprecated },
  
  	/* Unsupported options */
  	{ "afstokenpassing", oUnsupported },
  	{ "kerberosauthentication", oUnsupported },
  	{ "kerberostgtpassing", oUnsupported },
  	{ "rsaauthentication", oUnsupported },
  	{ "rhostsrsaauthentication", oUnsupported },
  	{ "compressionlevel", oUnsupported },
  
  	/* Sometimes-unsupported options */
  #if defined(GSSAPI)
  	{ "gssapiauthentication", oGssAuthentication },
  	{ "gssapidelegatecredentials", oGssDelegateCreds },
  # else
  	{ "gssapiauthentication", oUnsupported },
  	{ "gssapidelegatecredentials", oUnsupported },
  #endif
  #ifdef ENABLE_PKCS11
  	{ "pkcs11provider", oPKCS11Provider },
  	{ "smartcarddevice", oPKCS11Provider },
  # else
  	{ "smartcarddevice", oUnsupported },
  	{ "pkcs11provider", oUnsupported },
  #endif
  
  	{ "forwardagent", oForwardAgent },
  	{ "forwardx11", oForwardX11 },
  	{ "forwardx11trusted", oForwardX11Trusted },
  	{ "forwardx11timeout", oForwardX11Timeout },
  	{ "exitonforwardfailure", oExitOnForwardFailure },
  	{ "xauthlocation", oXAuthLocation },
  	{ "gatewayports", oGatewayPorts },
  	{ "passwordauthentication", oPasswordAuthentication },
  	{ "kbdinteractiveauthentication", oKbdInteractiveAuthentication },
  	{ "kbdinteractivedevices", oKbdInteractiveDevices },
  	{ "challengeresponseauthentication", oKbdInteractiveAuthentication }, /* alias */
  	{ "skeyauthentication", oKbdInteractiveAuthentication }, /* alias */
  	{ "tisauthentication", oKbdInteractiveAuthentication },  /* alias */
  	{ "pubkeyauthentication", oPubkeyAuthentication },
  	{ "dsaauthentication", oPubkeyAuthentication },		    /* alias */
  	{ "hostbasedauthentication", oHostbasedAuthentication },
  	{ "identityfile", oIdentityFile },
  	{ "identityfile2", oIdentityFile },			/* obsolete */
  	{ "identitiesonly", oIdentitiesOnly },
  	{ "certificatefile", oCertificateFile },
  	{ "addkeystoagent", oAddKeysToAgent },
  	{ "identityagent", oIdentityAgent },
  	{ "hostname", oHostname },
  	{ "hostkeyalias", oHostKeyAlias },
  	{ "proxycommand", oProxyCommand },
  	{ "port", oPort },
  	{ "ciphers", oCiphers },
  	{ "macs", oMacs },
  	{ "remoteforward", oRemoteForward },
  	{ "localforward", oLocalForward },
  	{ "permitremoteopen", oPermitRemoteOpen },
  	{ "user", oUser },
  	{ "host", oHost },
  	{ "match", oMatch },
  	{ "tag", oTag },
  	{ "escapechar", oEscapeChar },
  	{ "globalknownhostsfile", oGlobalKnownHostsFile },
  	{ "userknownhostsfile", oUserKnownHostsFile },
  	{ "connectionattempts", oConnectionAttempts },
  	{ "batchmode", oBatchMode },
  	{ "checkhostip", oCheckHostIP },
  	{ "stricthostkeychecking", oStrictHostKeyChecking },
  	{ "compression", oCompression },
  	{ "tcpkeepalive", oTCPKeepAlive },
  	{ "keepalive", oTCPKeepAlive },				/* obsolete */
  	{ "numberofpasswordprompts", oNumberOfPasswordPrompts },
  	{ "syslogfacility", oLogFacility },
  	{ "loglevel", oLogLevel },
  	{ "logverbose", oLogVerbose },
  	{ "dynamicforward", oDynamicForward },
  	{ "preferredauthentications", oPreferredAuthentications },
  	{ "hostkeyalgorithms", oHostKeyAlgorithms },
  	{ "casignaturealgorithms", oCASignatureAlgorithms },
  	{ "bindaddress", oBindAddress },
  	{ "bindinterface", oBindInterface },
  	{ "clearallforwardings", oClearAllForwardings },
  	{ "enablesshkeysign", oEnableSSHKeysign },
  	{ "verifyhostkeydns", oVerifyHostKeyDNS },
  	{ "nohostauthenticationforlocalhost", oNoHostAuthenticationForLocalhost },
  	{ "rekeylimit", oRekeyLimit },
  	{ "connecttimeout", oConnectTimeout },
  	{ "addressfamily", oAddressFamily },
  	{ "serveraliveinterval", oServerAliveInterval },
  	{ "serveralivecountmax", oServerAliveCountMax },
  	{ "sendenv", oSendEnv },
  	{ "setenv", oSetEnv },
  	{ "controlpath", oControlPath },
  	{ "controlmaster", oControlMaster },
  	{ "controlpersist", oControlPersist },
  	{ "hashknownhosts", oHashKnownHosts },
  	{ "include", oInclude },
  	{ "tunnel", oTunnel },
  	{ "tunneldevice", oTunnelDevice },
  	{ "localcommand", oLocalCommand },
  	{ "permitlocalcommand", oPermitLocalCommand },
  	{ "remotecommand", oRemoteCommand },
  	{ "visualhostkey", oVisualHostKey },
  	{ "kexalgorithms", oKexAlgorithms },
  	{ "ipqos", oIPQoS },
  	{ "requesttty", oRequestTTY },
  	{ "sessiontype", oSessionType },
  	{ "stdinnull", oStdinNull },
  	{ "forkafterauthentication", oForkAfterAuthentication },
  	{ "proxyusefdpass", oProxyUseFdpass },
  	{ "canonicaldomains", oCanonicalDomains },
  	{ "canonicalizefallbacklocal", oCanonicalizeFallbackLocal },
  	{ "canonicalizehostname", oCanonicalizeHostname },
  	{ "canonicalizemaxdots", oCanonicalizeMaxDots },
  	{ "canonicalizepermittedcnames", oCanonicalizePermittedCNAMEs },
  	{ "streamlocalbindmask", oStreamLocalBindMask },
  	{ "streamlocalbindunlink", oStreamLocalBindUnlink },
  	{ "revokedhostkeys", oRevokedHostKeys },
  	{ "fingerprinthash", oFingerprintHash },
  	{ "updatehostkeys", oUpdateHostkeys },
  	{ "hostbasedacceptedalgorithms", oHostbasedAcceptedAlgorithms },
  	{ "hostbasedkeytypes", oHostbasedAcceptedAlgorithms }, /* obsolete */
  	{ "pubkeyacceptedalgorithms", oPubkeyAcceptedAlgorithms },
  	{ "pubkeyacceptedkeytypes", oPubkeyAcceptedAlgorithms }, /* obsolete */
  	{ "ignoreunknown", oIgnoreUnknown },
  	{ "proxyjump", oProxyJump },
  	{ "securitykeyprovider", oSecurityKeyProvider },
  	{ "knownhostscommand", oKnownHostsCommand },
  	{ "requiredrsasize", oRequiredRSASize },
  	{ "enableescapecommandline", oEnableEscapeCommandline },
  	{ "obscurekeystroketiming", oObscureKeystrokeTiming },
  	{ "channeltimeout", oChannelTimeout },
  
  	{ NULL, oBadOption }
  };
  
  static const char *lookup_opcode_name(OpCodes code);
  
  const char *
  kex_default_pk_alg(void)
  {
  	static char *pkalgs;
  
  	if (pkalgs == NULL) {
  		char *all_key;
  
  		all_key = sshkey_alg_list(0, 0, 1, ',');
  		pkalgs = match_filter_allowlist(KEX_DEFAULT_PK_ALG, all_key);
  		free(all_key);
  	}
  	return pkalgs;
  }
  
  char *
  ssh_connection_hash(const char *thishost, const char *host, const char *portstr,
      const char *user, const char *jumphost)
  {
  	struct ssh_digest_ctx *md;
  	u_char conn_hash[SSH_DIGEST_MAX_LENGTH];
  
  	if ((md = ssh_digest_start(SSH_DIGEST_SHA1)) == NULL ||
  	    ssh_digest_update(md, thishost, strlen(thishost)) < 0 ||
  	    ssh_digest_update(md, host, strlen(host)) < 0 ||
  	    ssh_digest_update(md, portstr, strlen(portstr)) < 0 ||
  	    ssh_digest_update(md, user, strlen(user)) < 0 ||
  	    ssh_digest_update(md, jumphost, strlen(jumphost)) < 0 ||
  	    ssh_digest_final(md, conn_hash, sizeof(conn_hash)) < 0)
  		fatal_f("mux digest failed");
  	ssh_digest_free(md);
  	return tohex(conn_hash, ssh_digest_bytes(SSH_DIGEST_SHA1));
  }
  
  /*
   * Adds a local TCP/IP port forward to options.  Never returns if there is an
   * error.
   */
  
  void
  add_local_forward(Options *options, const struct Forward *newfwd)
  {
  	struct Forward *fwd;
  	int i;
  
  	/* Don't add duplicates */
  	for (i = 0; i < options->num_local_forwards; i++) {
  		if (forward_equals(newfwd, options->local_forwards + i))
  			return;
  	}
  	options->local_forwards = xreallocarray(options->local_forwards,
  	    options->num_local_forwards + 1,
  	    sizeof(*options->local_forwards));
  	fwd = &options->local_forwards[options->num_local_forwards++];
  
  	fwd->listen_host = newfwd->listen_host;
  	fwd->listen_port = newfwd->listen_port;
  	fwd->listen_path = newfwd->listen_path;
  	fwd->connect_host = newfwd->connect_host;
  	fwd->connect_port = newfwd->connect_port;
  	fwd->connect_path = newfwd->connect_path;
  }
  
  /*
   * Adds a remote TCP/IP port forward to options.  Never returns if there is
   * an error.
   */
  
  void
  add_remote_forward(Options *options, const struct Forward *newfwd)
  {
  	struct Forward *fwd;
  	int i;
  
  	/* Don't add duplicates */
  	for (i = 0; i < options->num_remote_forwards; i++) {
  		if (forward_equals(newfwd, options->remote_forwards + i))
  			return;
  	}
  	options->remote_forwards = xreallocarray(options->remote_forwards,
  	    options->num_remote_forwards + 1,
  	    sizeof(*options->remote_forwards));
  	fwd = &options->remote_forwards[options->num_remote_forwards++];
  
  	fwd->listen_host = newfwd->listen_host;
  	fwd->listen_port = newfwd->listen_port;
  	fwd->listen_path = newfwd->listen_path;
  	fwd->connect_host = newfwd->connect_host;
  	fwd->connect_port = newfwd->connect_port;
  	fwd->connect_path = newfwd->connect_path;
  	fwd->handle = newfwd->handle;
  	fwd->allocated_port = 0;
  }
  
  static void
  clear_forwardings(Options *options)
  {
  	int i;
  
  	for (i = 0; i < options->num_local_forwards; i++) {
  		free(options->local_forwards[i].listen_host);
  		free(options->local_forwards[i].listen_path);
  		free(options->local_forwards[i].connect_host);
  		free(options->local_forwards[i].connect_path);
  	}
  	if (options->num_local_forwards > 0) {
  		free(options->local_forwards);
  		options->local_forwards = NULL;
  	}
  	options->num_local_forwards = 0;
  	for (i = 0; i < options->num_remote_forwards; i++) {
  		free(options->remote_forwards[i].listen_host);
  		free(options->remote_forwards[i].listen_path);
  		free(options->remote_forwards[i].connect_host);
  		free(options->remote_forwards[i].connect_path);
  	}
  	if (options->num_remote_forwards > 0) {
  		free(options->remote_forwards);
  		options->remote_forwards = NULL;
  	}
  	options->num_remote_forwards = 0;
  	options->tun_open = SSH_TUNMODE_NO;
  }
  
  void
  add_certificate_file(Options *options, const char *path, int userprovided)
  {
  	int i;
  
  	if (options->num_certificate_files >= SSH_MAX_CERTIFICATE_FILES)
  		fatal("Too many certificate files specified (max %d)",
  		    SSH_MAX_CERTIFICATE_FILES);
  
  	/* Avoid registering duplicates */
  	for (i = 0; i < options->num_certificate_files; i++) {
  		if (options->certificate_file_userprovided[i] == userprovided &&
  		    strcmp(options->certificate_files[i], path) == 0) {
  			debug2_f("ignoring duplicate key %s", path);
  			return;
  		}
  	}
  
  	options->certificate_file_userprovided[options->num_certificate_files] =
  	    userprovided;
  	options->certificate_files[options->num_certificate_files++] =
  	    xstrdup(path);
  }
  
  void
  add_identity_file(Options *options, const char *dir, const char *filename,
      int userprovided)
  {
  	char *path;
  	int i;
  
  	if (options->num_identity_files >= SSH_MAX_IDENTITY_FILES)
  		fatal("Too many identity files specified (max %d)",
  		    SSH_MAX_IDENTITY_FILES);
  
  	if (dir == NULL) /* no dir, filename is absolute */
  		path = xstrdup(filename);
  	else if (xasprintf(&path, "%s%s", dir, filename) >= PATH_MAX)
  		fatal("Identity file path %s too long", path);
  
  	/* Avoid registering duplicates */
  	for (i = 0; i < options->num_identity_files; i++) {
  		if (options->identity_file_userprovided[i] == userprovided &&
  		    strcmp(options->identity_files[i], path) == 0) {
  			debug2_f("ignoring duplicate key %s", path);
  			free(path);
  			return;
  		}
  	}
  
  	options->identity_file_userprovided[options->num_identity_files] =
  	    userprovided;
  	options->identity_files[options->num_identity_files++] = path;
  }
  
  int
  default_ssh_port(void)
  {
  	static int port;
  	struct servent *sp;
  
  	if (port == 0) {
  		sp = getservbyname(SSH_SERVICE_NAME, "tcp");
  		port = sp ? ntohs(sp->s_port) : SSH_DEFAULT_PORT;
  	}
  	return port;
  }
  
  /*
   * Execute a command in a shell.
   * Return its exit status or -1 on abnormal exit.
   */
  static int
  execute_in_shell(const char *cmd)
  {
  	char *shell;
  	pid_t pid;
  	int status;
  
  	if ((shell = getenv("SHELL")) == NULL)
  		shell = _PATH_BSHELL;
  
  	if (access(shell, X_OK) == -1) {
  		fatal("Shell \"%s\" is not executable: %s",
  		    shell, strerror(errno));
  	}
  
  	debug("Executing command: '%.500s'", cmd);
  
  	/* Fork and execute the command. */
  	if ((pid = fork()) == 0) {
  		char *argv[4];
  
  		if (stdfd_devnull(1, 1, 0) == -1)
  			fatal_f("stdfd_devnull failed");
  		closefrom(STDERR_FILENO + 1);
  
  		argv[0] = shell;
  		argv[1] = "-c";
  		argv[2] = xstrdup(cmd);
  		argv[3] = NULL;
  
  		execv(argv[0], argv);
  		error("Unable to execute '%.100s': %s", cmd, strerror(errno));
  		/* Die with signal to make this error apparent to parent. */
  		ssh_signal(SIGTERM, SIG_DFL);
  		kill(getpid(), SIGTERM);
  		_exit(1);
  	}
  	/* Parent. */
  	if (pid == -1)
  		fatal_f("fork: %.100s", strerror(errno));
  
  	while (waitpid(pid, &status, 0) == -1) {
  		if (errno != EINTR && errno != EAGAIN)
  			fatal_f("waitpid: %s", strerror(errno));
  	}
  	if (!WIFEXITED(status)) {
  		error("command '%.100s' exited abnormally", cmd);
  		return -1;
  	}
  	debug3("command returned status %d", WEXITSTATUS(status));
  	return WEXITSTATUS(status);
  }
  
  /*
   * Check whether a local network interface address appears in CIDR pattern-
   * list 'addrlist'. Returns 1 if matched or 0 otherwise.
   */
  static int
  check_match_ifaddrs(const char *addrlist)
  {
  	struct ifaddrs *ifa, *ifaddrs = NULL;
  	int r, found = 0;
  	char addr[NI_MAXHOST];
  	socklen_t salen;
  
  	if (getifaddrs(&ifaddrs) != 0) {
  		error("match localnetwork: getifaddrs failed: %s",
  		    strerror(errno));
  		return 0;
  	}
  	for (ifa = ifaddrs; ifa != NULL; ifa = ifa->ifa_next) {
  		if (ifa->ifa_addr == NULL || ifa->ifa_name == NULL ||
  		    (ifa->ifa_flags & IFF_UP) == 0)
  			continue;
  		switch (ifa->ifa_addr->sa_family) {
  		case AF_INET:
  			salen = sizeof(struct sockaddr_in);
  			break;
  		case AF_INET6:
  			salen = sizeof(struct sockaddr_in6);
  			break;
  		case AF_LINK:
  			/* ignore */
  			continue;
  		default:
  			debug2_f("interface %s: unsupported address family %d",
  			    ifa->ifa_name, ifa->ifa_addr->sa_family);
  			continue;
  		}
  		if ((r = getnameinfo(ifa->ifa_addr, salen, addr, sizeof(addr),
  		    NULL, 0, NI_NUMERICHOST)) != 0) {
  			debug2_f("interface %s getnameinfo failed: %s",
  			    ifa->ifa_name, gai_strerror(r));
  			continue;
  		}
  		debug3_f("interface %s addr %s", ifa->ifa_name, addr);
  		if (addr_match_cidr_list(addr, addrlist) == 1) {
  			debug3_f("matched interface %s: address %s in %s",
  			    ifa->ifa_name, addr, addrlist);
  			found = 1;
  			break;
  		}
  	}
  	freeifaddrs(ifaddrs);
  	return found;
  }
  
  /*
   * Parse and execute a Match directive.
   */
  static int
  match_cfg_line(Options *options, char **condition, struct passwd *pw,
      const char *host_arg, const char *original_host, int final_pass,
      int *want_final_pass, const char *filename, int linenum)
  {
  	char *arg, *oattrib, *attrib, *cmd, *cp = *condition, *host, *criteria;
  	const char *ruser;
  	int r, port, this_result, result = 1, attributes = 0, negate;
  	char thishost[NI_MAXHOST], shorthost[NI_MAXHOST], portstr[NI_MAXSERV];
  	char uidstr[32];
  
  	/*
  	 * Configuration is likely to be incomplete at this point so we
  	 * must be prepared to use default values.
  	 */
  	port = options->port <= 0 ? default_ssh_port() : options->port;
  	ruser = options->user == NULL ? pw->pw_name : options->user;
  	if (final_pass) {
  		host = xstrdup(options->hostname);
  	} else if (options->hostname != NULL) {
  		/* NB. Please keep in sync with ssh.c:main() */
  		host = percent_expand(options->hostname,
  		    "h", host_arg, (char *)NULL);
  	} else {
  		host = xstrdup(host_arg);
  	}
  
  	debug2("checking match for '%s' host %s originally %s",
  	    cp, host, original_host);
  	while ((oattrib = attrib = strdelim(&cp)) && *attrib != '\0') {
  		/* Terminate on comment */
  		if (*attrib == '#') {
  			cp = NULL; /* mark all arguments consumed */
  			break;
  		}
  		arg = criteria = NULL;
  		this_result = 1;
  		if ((negate = (attrib[0] == '!')))
  			attrib++;
  		/* Criterion "all" has no argument and must appear alone */
  		if (strcasecmp(attrib, "all") == 0) {
  			if (attributes > 1 || ((arg = strdelim(&cp)) != NULL &&
  			    *arg != '\0' && *arg != '#')) {
  				error("%.200s line %d: '%s' cannot be combined "
  				    "with other Match attributes",
  				    filename, linenum, oattrib);
  				result = -1;
  				goto out;
  			}
  			if (arg != NULL && *arg == '#')
  				cp = NULL; /* mark all arguments consumed */
  			if (result)
  				result = negate ? 0 : 1;
  			goto out;
  		}
  		attributes++;
  		/* criteria "final" and "canonical" have no argument */
  		if (strcasecmp(attrib, "canonical") == 0 ||
  		    strcasecmp(attrib, "final") == 0) {
  			/*
  			 * If the config requests "Match final" then remember
  			 * this so we can perform a second pass later.
  			 */
  			if (strcasecmp(attrib, "final") == 0 &&
  			    want_final_pass != NULL)
  				*want_final_pass = 1;
  			r = !!final_pass;  /* force bitmask member to boolean */
  			if (r == (negate ? 1 : 0))
  				this_result = result = 0;
  			debug3("%.200s line %d: %smatched '%s'",
  			    filename, linenum,
  			    this_result ? "" : "not ", oattrib);
  			continue;
  		}
  		/* All other criteria require an argument */
  		if ((arg = strdelim(&cp)) == NULL ||
  		    *arg == '\0' || *arg == '#') {
  			error("Missing Match criteria for %s", attrib);
  			result = -1;
  			goto out;
  		}
  		if (strcasecmp(attrib, "host") == 0) {
  			criteria = xstrdup(host);
  			r = match_hostname(host, arg) == 1;
  			if (r == (negate ? 1 : 0))
  				this_result = result = 0;
  		} else if (strcasecmp(attrib, "originalhost") == 0) {
  			criteria = xstrdup(original_host);
  			r = match_hostname(original_host, arg) == 1;
  			if (r == (negate ? 1 : 0))
  				this_result = result = 0;
  		} else if (strcasecmp(attrib, "user") == 0) {
  			criteria = xstrdup(ruser);
  			r = match_pattern_list(ruser, arg, 0) == 1;
  			if (r == (negate ? 1 : 0))
  				this_result = result = 0;
  		} else if (strcasecmp(attrib, "localuser") == 0) {
  			criteria = xstrdup(pw->pw_name);
  			r = match_pattern_list(pw->pw_name, arg, 0) == 1;
  			if (r == (negate ? 1 : 0))
  				this_result = result = 0;
  		} else if (strcasecmp(attrib, "localnetwork") == 0) {
  			if (addr_match_cidr_list(NULL, arg) == -1) {
  				/* Error already printed */
  				result = -1;
  				goto out;
  			}
  			r = check_match_ifaddrs(arg) == 1;
  			if (r == (negate ? 1 : 0))
  				this_result = result = 0;
  		} else if (strcasecmp(attrib, "tagged") == 0) {
  			criteria = xstrdup(options->tag == NULL ? "" :
  			    options->tag);
  			r = match_pattern_list(criteria, arg, 0) == 1;
  			if (r == (negate ? 1 : 0))
  				this_result = result = 0;
  		} else if (strcasecmp(attrib, "exec") == 0) {
  			char *conn_hash_hex, *keyalias, *jmphost;
  
  			if (gethostname(thishost, sizeof(thishost)) == -1)
  				fatal("gethostname: %s", strerror(errno));
  			jmphost = option_clear_or_none(options->jump_host) ?
  			    "" : options->jump_host;
  			strlcpy(shorthost, thishost, sizeof(shorthost));
  			shorthost[strcspn(thishost, ".")] = '\0';
  			snprintf(portstr, sizeof(portstr), "%d", port);
  			snprintf(uidstr, sizeof(uidstr), "%llu",
  			    (unsigned long long)pw->pw_uid);
  			conn_hash_hex = ssh_connection_hash(thishost, host,
  			    portstr, ruser, jmphost);
  			keyalias = options->host_key_alias ?
  			    options->host_key_alias : host;
  
  			cmd = percent_expand(arg,
  			    "C", conn_hash_hex,
  			    "L", shorthost,
  			    "d", pw->pw_dir,
  			    "h", host,
  			    "k", keyalias,
  			    "l", thishost,
  			    "n", original_host,
  			    "p", portstr,
  			    "r", ruser,
  			    "u", pw->pw_name,
  			    "i", uidstr,
  			    "j", jmphost,
  			    (char *)NULL);
  			free(conn_hash_hex);
  			if (result != 1) {
  				/* skip execution if prior predicate failed */
  				debug3("%.200s line %d: skipped exec "
  				    "\"%.100s\"", filename, linenum, cmd);
  				free(cmd);
  				continue;
  			}
  			r = execute_in_shell(cmd);
  			if (r == -1) {
  				fatal("%.200s line %d: match exec "
  				    "'%.100s' error", filename,
  				    linenum, cmd);
  			}
  			criteria = xstrdup(cmd);
  			free(cmd);
  			/* Force exit status to boolean */
  			r = r == 0;
  			if (r == (negate ? 1 : 0))
  				this_result = result = 0;
  		} else {
  			error("Unsupported Match attribute %s", attrib);
  			result = -1;
  			goto out;
  		}
  		debug3("%.200s line %d: %smatched '%s%s%.100s%s' ",
  		    filename, linenum, this_result ? "": "not ", oattrib,
  		    criteria == NULL ? "" : " \"",
  		    criteria == NULL ? "" : criteria,
  		    criteria == NULL ? "" : "\"");
  		free(criteria);
  	}
  	if (attributes == 0) {
  		error("One or more attributes required for Match");
  		result = -1;
  		goto out;
  	}
   out:
  	if (result != -1)
  		debug2("match %sfound", result ? "" : "not ");
  	*condition = cp;
  	free(host);
  	return result;
  }
  
  /* Remove environment variable by pattern */
  static void
  rm_env(Options *options, const char *arg, const char *filename, int linenum)
  {
  	u_int i, j, onum_send_env = options->num_send_env;
  
  	/* Remove an environment variable */
  	for (i = 0; i < options->num_send_env; ) {
  		if (!match_pattern(options->send_env[i], arg + 1)) {
  			i++;
  			continue;
  		}
  		debug3("%s line %d: removing environment %s",
  		    filename, linenum, options->send_env[i]);
  		free(options->send_env[i]);
  		options->send_env[i] = NULL;
  		for (j = i; j < options->num_send_env - 1; j++) {
  			options->send_env[j] = options->send_env[j + 1];
  			options->send_env[j + 1] = NULL;
  		}
  		options->num_send_env--;
  		/* NB. don't increment i */
  	}
  	if (onum_send_env != options->num_send_env) {
  		options->send_env = xrecallocarray(options->send_env,
  		    onum_send_env, options->num_send_env,
  		    sizeof(*options->send_env));
  	}
  }
  
  /*
   * Returns the number of the token pointed to by cp or oBadOption.
   */
  static OpCodes
  parse_token(const char *cp, const char *filename, int linenum,
      const char *ignored_unknown)
  {
  	int i;
  
  	for (i = 0; keywords[i].name; i++)
  		if (strcmp(cp, keywords[i].name) == 0)
  			return keywords[i].opcode;
  	if (ignored_unknown != NULL &&
  	    match_pattern_list(cp, ignored_unknown, 1) == 1)
  		return oIgnoredUnknownOption;
  	error("%s: line %d: Bad configuration option: %s",
  	    filename, linenum, cp);
  	return oBadOption;
  }
  
  static void
  free_canon_cnames(struct allowed_cname *cnames, u_int n)
  {
  	u_int i;
  
  	if (cnames == NULL || n == 0)
  		return;
  	for (i = 0; i < n; i++) {
  		free(cnames[i].source_list);
  		free(cnames[i].target_list);
  	}
  	free(cnames);
  }
  
  /* Multistate option parsing */
  struct multistate {
  	char *key;
  	int value;
  };
  static const struct multistate multistate_flag[] = {
  	{ "true",			1 },
  	{ "false",			0 },
  	{ "yes",			1 },
  	{ "no",				0 },
  	{ NULL, -1 }
  };
  static const struct multistate multistate_yesnoask[] = {
  	{ "true",			1 },
  	{ "false",			0 },
  	{ "yes",			1 },
  	{ "no",				0 },
  	{ "ask",			2 },
  	{ NULL, -1 }
  };
  static const struct multistate multistate_strict_hostkey[] = {
  	{ "true",			SSH_STRICT_HOSTKEY_YES },
  	{ "false",			SSH_STRICT_HOSTKEY_OFF },
  	{ "yes",			SSH_STRICT_HOSTKEY_YES },
  	{ "no",				SSH_STRICT_HOSTKEY_OFF },
  	{ "ask",			SSH_STRICT_HOSTKEY_ASK },
  	{ "off",			SSH_STRICT_HOSTKEY_OFF },
  	{ "accept-new",			SSH_STRICT_HOSTKEY_NEW },
  	{ NULL, -1 }
  };
  static const struct multistate multistate_yesnoaskconfirm[] = {
  	{ "true",			1 },
  	{ "false",			0 },
  	{ "yes",			1 },
  	{ "no",				0 },
  	{ "ask",			2 },
  	{ "confirm",			3 },
  	{ NULL, -1 }
  };
  static const struct multistate multistate_addressfamily[] = {
  	{ "inet",			AF_INET },
  	{ "inet6",			AF_INET6 },
  	{ "any",			AF_UNSPEC },
  	{ NULL, -1 }
  };
  static const struct multistate multistate_controlmaster[] = {
  	{ "true",			SSHCTL_MASTER_YES },
  	{ "yes",			SSHCTL_MASTER_YES },
  	{ "false",			SSHCTL_MASTER_NO },
  	{ "no",				SSHCTL_MASTER_NO },
  	{ "auto",			SSHCTL_MASTER_AUTO },
  	{ "ask",			SSHCTL_MASTER_ASK },
  	{ "autoask",			SSHCTL_MASTER_AUTO_ASK },
  	{ NULL, -1 }
  };
  static const struct multistate multistate_tunnel[] = {
  	{ "ethernet",			SSH_TUNMODE_ETHERNET },
  	{ "point-to-point",		SSH_TUNMODE_POINTOPOINT },
  	{ "true",			SSH_TUNMODE_DEFAULT },
  	{ "yes",			SSH_TUNMODE_DEFAULT },
  	{ "false",			SSH_TUNMODE_NO },
  	{ "no",				SSH_TUNMODE_NO },
  	{ NULL, -1 }
  };
  static const struct multistate multistate_requesttty[] = {
  	{ "true",			REQUEST_TTY_YES },
  	{ "yes",			REQUEST_TTY_YES },
  	{ "false",			REQUEST_TTY_NO },
  	{ "no",				REQUEST_TTY_NO },
  	{ "force",			REQUEST_TTY_FORCE },
  	{ "auto",			REQUEST_TTY_AUTO },
  	{ NULL, -1 }
  };
  static const struct multistate multistate_sessiontype[] = {
  	{ "none",			SESSION_TYPE_NONE },
  	{ "subsystem",			SESSION_TYPE_SUBSYSTEM },
  	{ "default",			SESSION_TYPE_DEFAULT },
  	{ NULL, -1 }
  };
  static const struct multistate multistate_canonicalizehostname[] = {
  	{ "true",			SSH_CANONICALISE_YES },
  	{ "false",			SSH_CANONICALISE_NO },
  	{ "yes",			SSH_CANONICALISE_YES },
  	{ "no",				SSH_CANONICALISE_NO },
  	{ "always",			SSH_CANONICALISE_ALWAYS },
  	{ NULL, -1 }
  };
  static const struct multistate multistate_pubkey_auth[] = {
  	{ "true",			SSH_PUBKEY_AUTH_ALL },
  	{ "false",			SSH_PUBKEY_AUTH_NO },
  	{ "yes",			SSH_PUBKEY_AUTH_ALL },
  	{ "no",				SSH_PUBKEY_AUTH_NO },
  	{ "unbound",			SSH_PUBKEY_AUTH_UNBOUND },
  	{ "host-bound",			SSH_PUBKEY_AUTH_HBOUND },
  	{ NULL, -1 }
  };
  static const struct multistate multistate_compression[] = {
  #ifdef WITH_ZLIB
  	{ "yes",			COMP_ZLIB },
  #endif
  	{ "no",				COMP_NONE },
  	{ NULL, -1 }
  };
  
  static int
  parse_multistate_value(const char *arg, const char *filename, int linenum,
      const struct multistate *multistate_ptr)
  {
  	int i;
  
  	if (!arg || *arg == '\0') {
  		error("%s line %d: missing argument.", filename, linenum);
  		return -1;
  	}
  	for (i = 0; multistate_ptr[i].key != NULL; i++) {
  		if (strcasecmp(arg, multistate_ptr[i].key) == 0)
  			return multistate_ptr[i].value;
  	}
  	return -1;
  }
  
  /*
   * Processes a single option line as used in the configuration files. This
   * only sets those values that have not already been set.
   */
  int
  process_config_line(Options *options, struct passwd *pw, const char *host,
      const char *original_host, char *line, const char *filename,
      int linenum, int *activep, int flags)
  {
  	return process_config_line_depth(options, pw, host, original_host,
  	    line, filename, linenum, activep, flags, NULL, 0);
  }
  
  #define WHITESPACE " \t\r\n"
  static int
  process_config_line_depth(Options *options, struct passwd *pw, const char *host,
      const char *original_host, char *line, const char *filename,
      int linenum, int *activep, int flags, int *want_final_pass, int depth)
  {
  	char *str, **charptr, *endofnumber, *keyword, *arg, *arg2, *p;
  	char **cpptr, ***cppptr, fwdarg[256];
  	u_int i, *uintptr, max_entries = 0;
  	int r, oactive, negated, opcode, *intptr, value, value2, cmdline = 0;
  	int remotefwd, dynamicfwd, ca_only = 0, found = 0;
  	LogLevel *log_level_ptr;
  	SyslogFacility *log_facility_ptr;
  	long long val64;
  	size_t len;
  	struct Forward fwd;
  	const struct multistate *multistate_ptr;
  	glob_t gl;
  	const char *errstr;
  	char **oav = NULL, **av;
  	int oac = 0, ac;
  	int ret = -1;
  	struct allowed_cname *cnames = NULL;
  	u_int ncnames = 0;
  	char **strs = NULL; /* string array arguments; freed implicitly */
  	u_int nstrs = 0;
  
  	if (activep == NULL) { /* We are processing a command line directive */
  		cmdline = 1;
  		activep = &cmdline;
  	}
  
  	/* Strip trailing whitespace. Allow \f (form feed) at EOL only */
  	if ((len = strlen(line)) == 0)
  		return 0;
  	for (len--; len > 0; len--) {
  		if (strchr(WHITESPACE "\f", line[len]) == NULL)
  			break;
  		line[len] = '\0';
  	}
  
  	str = line;
  	/* Get the keyword. (Each line is supposed to begin with a keyword). */
  	if ((keyword = strdelim(&str)) == NULL)
  		return 0;
  	/* Ignore leading whitespace. */
  	if (*keyword == '\0')
  		keyword = strdelim(&str);
  	if (keyword == NULL || !*keyword || *keyword == '\n' || *keyword == '#')
  		return 0;
  	/* Match lowercase keyword */
  	lowercase(keyword);
  
  	/* Prepare to parse remainder of line */
  	if (str != NULL)
  		str += strspn(str, WHITESPACE);
  	if (str == NULL || *str == '\0') {
  		error("%s line %d: no argument after keyword \"%s\"",
  		    filename, linenum, keyword);
  		return -1;
  	}
  	opcode = parse_token(keyword, filename, linenum,
  	    options->ignored_unknown);
  	if (argv_split(str, &oac, &oav, 1) != 0) {
  		error("%s line %d: invalid quotes", filename, linenum);
  		return -1;
  	}
  	ac = oac;
  	av = oav;
  
  	switch (opcode) {
  	case oBadOption:
  		/* don't panic, but count bad options */
  		goto out;
  	case oIgnore:
  		argv_consume(&ac);
  		break;
  	case oIgnoredUnknownOption:
  		debug("%s line %d: Ignored unknown option \"%s\"",
  		    filename, linenum, keyword);
  		argv_consume(&ac);
  		break;
  	case oConnectTimeout:
  		intptr = &options->connection_timeout;
  parse_time:
  		arg = argv_next(&ac, &av);
  		if (!arg || *arg == '\0') {
  			error("%s line %d: missing time value.",
  			    filename, linenum);
  			goto out;
  		}
  		if (strcmp(arg, "none") == 0)
  			value = -1;
  		else if ((value = convtime(arg)) == -1) {
  			error("%s line %d: invalid time value.",
  			    filename, linenum);
  			goto out;
  		}
  		if (*activep && *intptr == -1)
  			*intptr = value;
  		break;
  
  	case oForwardAgent:
  		intptr = &options->forward_agent;
  
  		arg = argv_next(&ac, &av);
  		if (!arg || *arg == '\0') {
  			error("%s line %d: missing argument.",
  			    filename, linenum);
  			goto out;
  		}
  
  		value = -1;
  		multistate_ptr = multistate_flag;
  		for (i = 0; multistate_ptr[i].key != NULL; i++) {
  			if (strcasecmp(arg, multistate_ptr[i].key) == 0) {
  				value = multistate_ptr[i].value;
  				break;
  			}
  		}
  		if (value != -1) {
  			if (*activep && *intptr == -1)
  				*intptr = value;
  			break;
  		}
  		/* ForwardAgent wasn't 'yes' or 'no', assume a path */
  		if (*activep && *intptr == -1)
  			*intptr = 1;
  
  		charptr = &options->forward_agent_sock_path;
  		goto parse_agent_path;
  
  	case oForwardX11:
  		intptr = &options->forward_x11;
   parse_flag:
  		multistate_ptr = multistate_flag;
   parse_multistate:
  		arg = argv_next(&ac, &av);
  		if ((value = parse_multistate_value(arg, filename, linenum,
  		    multistate_ptr)) == -1) {
  			error("%s line %d: unsupported option \"%s\".",
  			    filename, linenum, arg);
  			goto out;
  		}
  		if (*activep && *intptr == -1)
  			*intptr = value;
  		break;
  
  	case oForwardX11Trusted:
  		intptr = &options->forward_x11_trusted;
  		goto parse_flag;
  
  	case oForwardX11Timeout:
  		intptr = &options->forward_x11_timeout;
  		goto parse_time;
  
  	case oGatewayPorts:
  		intptr = &options->fwd_opts.gateway_ports;
  		goto parse_flag;
  
  	case oExitOnForwardFailure:
  		intptr = &options->exit_on_forward_failure;
  		goto parse_flag;
  
  	case oPasswordAuthentication:
  		intptr = &options->password_authentication;
  		goto parse_flag;
  
  	case oKbdInteractiveAuthentication:
  		intptr = &options->kbd_interactive_authentication;
  		goto parse_flag;
  
  	case oKbdInteractiveDevices:
  		charptr = &options->kbd_interactive_devices;
  		goto parse_string;
  
  	case oPubkeyAuthentication:
  		multistate_ptr = multistate_pubkey_auth;
  		intptr = &options->pubkey_authentication;
  		goto parse_multistate;
  
  	case oHostbasedAuthentication:
  		intptr = &options->hostbased_authentication;
  		goto parse_flag;
  
  	case oGssAuthentication:
  		intptr = &options->gss_authentication;
  		goto parse_flag;
  
  	case oGssDelegateCreds:
  		intptr = &options->gss_deleg_creds;
  		goto parse_flag;
  
  	case oBatchMode:
  		intptr = &options->batch_mode;
  		goto parse_flag;
  
  	case oCheckHostIP:
  		intptr = &options->check_host_ip;
  		goto parse_flag;
  
  	case oVerifyHostKeyDNS:
  		intptr = &options->verify_host_key_dns;
  		multistate_ptr = multistate_yesnoask;
  		goto parse_multistate;
  
  	case oStrictHostKeyChecking:
  		intptr = &options->strict_host_key_checking;
  		multistate_ptr = multistate_strict_hostkey;
  		goto parse_multistate;
  
  	case oCompression:
  		intptr = &options->compression;
  		multistate_ptr = multistate_compression;
  		goto parse_multistate;
  
  	case oTCPKeepAlive:
  		intptr = &options->tcp_keep_alive;
  		goto parse_flag;
  
  	case oNoHostAuthenticationForLocalhost:
  		intptr = &options->no_host_authentication_for_localhost;
  		goto parse_flag;
  
  	case oNumberOfPasswordPrompts:
  		intptr = &options->number_of_password_prompts;
  		goto parse_int;
  
  	case oRekeyLimit:
  		arg = argv_next(&ac, &av);
  		if (!arg || *arg == '\0') {
  			error("%.200s line %d: Missing argument.", filename,
  			    linenum);
  			goto out;
  		}
  		if (strcmp(arg, "default") == 0) {
  			val64 = 0;
  		} else {
  			if (scan_scaled(arg, &val64) == -1) {
  				error("%.200s line %d: Bad number '%s': %s",
  				    filename, linenum, arg, strerror(errno));
  				goto out;
  			}
  			if (val64 != 0 && val64 < 16) {
  				error("%.200s line %d: RekeyLimit too small",
  				    filename, linenum);
  				goto out;
  			}
  		}
  		if (*activep && options->rekey_limit == -1)
  			options->rekey_limit = val64;
  		if (ac != 0) { /* optional rekey interval present */
  			if (strcmp(av[0], "none") == 0) {
  				(void)argv_next(&ac, &av);	/* discard */
  				break;
  			}
  			intptr = &options->rekey_interval;
  			goto parse_time;
  		}
  		break;
  
  	case oIdentityFile:
  		arg = argv_next(&ac, &av);
  		if (!arg || *arg == '\0') {
  			error("%.200s line %d: Missing argument.",
  			    filename, linenum);
  			goto out;
  		}
  		if (*activep) {
  			intptr = &options->num_identity_files;
  			if (*intptr >= SSH_MAX_IDENTITY_FILES) {
  				error("%.200s line %d: Too many identity files "
  				    "specified (max %d).", filename, linenum,
  				    SSH_MAX_IDENTITY_FILES);
  				goto out;
  			}
  			add_identity_file(options, NULL,
  			    arg, flags & SSHCONF_USERCONF);
  		}
  		break;
  
  	case oCertificateFile:
  		arg = argv_next(&ac, &av);
  		if (!arg || *arg == '\0') {
  			error("%.200s line %d: Missing argument.",
  			    filename, linenum);
  			goto out;
  		}
  		if (*activep) {
  			intptr = &options->num_certificate_files;
  			if (*intptr >= SSH_MAX_CERTIFICATE_FILES) {
  				error("%.200s line %d: Too many certificate "
  				    "files specified (max %d).",
  				    filename, linenum,
  				    SSH_MAX_CERTIFICATE_FILES);
  				goto out;
  			}
  			add_certificate_file(options, arg,
  			    flags & SSHCONF_USERCONF);
  		}
  		break;
  
  	case oXAuthLocation:
  		charptr=&options->xauth_location;
  		goto parse_string;
  
  	case oUser:
  		charptr = &options->user;
  parse_string:
  		arg = argv_next(&ac, &av);
  		if (!arg || *arg == '\0') {
  			error("%.200s line %d: Missing argument.",
  			    filename, linenum);
  			goto out;
  		}
  		if (*activep && *charptr == NULL)
  			*charptr = xstrdup(arg);
  		break;
  
  	case oGlobalKnownHostsFile:
  		cpptr = (char **)&options->system_hostfiles;
  		uintptr = &options->num_system_hostfiles;
  		max_entries = SSH_MAX_HOSTS_FILES;
  parse_char_array:
  		i = 0;
  		value = *uintptr == 0; /* was array empty when we started? */
  		while ((arg = argv_next(&ac, &av)) != NULL) {
  			if (*arg == '\0') {
  				error("%s line %d: keyword %s empty argument",
  				    filename, linenum, keyword);
  				goto out;
  			}
  			/* Allow "none" only in first position */
  			if (strcasecmp(arg, "none") == 0) {
  				if (i > 0 || ac > 0) {
  					error("%s line %d: keyword %s \"none\" "
  					    "argument must appear alone.",
  					    filename, linenum, keyword);
  					goto out;
  				}
  			}
  			i++;
  			if (*activep && value) {
  				if ((*uintptr) >= max_entries) {
  					error("%s line %d: too many %s "
  					    "entries.", filename, linenum,
  					    keyword);
  					goto out;
  				}
  				cpptr[(*uintptr)++] = xstrdup(arg);
  			}
  		}
  		break;
  
  	case oUserKnownHostsFile:
  		cpptr = (char **)&options->user_hostfiles;
  		uintptr = &options->num_user_hostfiles;
  		max_entries = SSH_MAX_HOSTS_FILES;
  		goto parse_char_array;
  
  	case oHostname:
  		charptr = &options->hostname;
  		goto parse_string;
  
  	case oTag:
  		charptr = &options->tag;
  		goto parse_string;
  
  	case oHostKeyAlias:
  		charptr = &options->host_key_alias;
  		goto parse_string;
  
  	case oPreferredAuthentications:
  		charptr = &options->preferred_authentications;
  		goto parse_string;
  
  	case oBindAddress:
  		charptr = &options->bind_address;
  		goto parse_string;
  
  	case oBindInterface:
  		charptr = &options->bind_interface;
  		goto parse_string;
  
  	case oPKCS11Provider:
  		charptr = &options->pkcs11_provider;
  		goto parse_string;
  
  	case oSecurityKeyProvider:
  		charptr = &options->sk_provider;
  		goto parse_string;
  
  	case oKnownHostsCommand:
  		charptr = &options->known_hosts_command;
  		goto parse_command;
  
  	case oProxyCommand:
  		charptr = &options->proxy_command;
  		/* Ignore ProxyCommand if ProxyJump already specified */
  		if (options->jump_host != NULL)
  			charptr = &options->jump_host; /* Skip below */
  parse_command:
  		if (str == NULL) {
  			error("%.200s line %d: Missing argument.",
  			    filename, linenum);
  			goto out;
  		}
  		len = strspn(str, WHITESPACE "=");
  		if (*activep && *charptr == NULL)
  			*charptr = xstrdup(str + len);
  		argv_consume(&ac);
  		break;
  
  	case oProxyJump:
  		if (str == NULL) {
  			error("%.200s line %d: Missing argument.",
  			    filename, linenum);
  			goto out;
  		}
  		len = strspn(str, WHITESPACE "=");
  		/* XXX use argv? */
  		if (parse_jump(str + len, options, *activep) == -1) {
  			error("%.200s line %d: Invalid ProxyJump \"%s\"",
  			    filename, linenum, str + len);
  			goto out;
  		}
  		argv_consume(&ac);
  		break;
  
  	case oPort:
  		arg = argv_next(&ac, &av);
  		if (!arg || *arg == '\0') {
  			error("%.200s line %d: Missing argument.",
  			    filename, linenum);
  			goto out;
  		}
  		value = a2port(arg);
  		if (value <= 0) {
  			error("%.200s line %d: Bad port '%s'.",
  			    filename, linenum, arg);
  			goto out;
  		}
  		if (*activep && options->port == -1)
  			options->port = value;
  		break;
  
  	case oConnectionAttempts:
  		intptr = &options->connection_attempts;
  parse_int:
  		arg = argv_next(&ac, &av);
  		if ((errstr = atoi_err(arg, &value)) != NULL) {
  			error("%s line %d: integer value %s.",
  			    filename, linenum, errstr);
  			goto out;
  		}
  		if (*activep && *intptr == -1)
  			*intptr = value;
  		break;
  
  	case oCiphers:
  		arg = argv_next(&ac, &av);
  		if (!arg || *arg == '\0') {
  			error("%.200s line %d: Missing argument.",
  			    filename, linenum);
  			goto out;
  		}
  		if (*arg != '-' &&
  		    !ciphers_valid(*arg == '+' || *arg == '^' ? arg + 1 : arg)){
  			error("%.200s line %d: Bad SSH2 cipher spec '%s'.",
  			    filename, linenum, arg ? arg : "<NONE>");
  			goto out;
  		}
  		if (*activep && options->ciphers == NULL)
  			options->ciphers = xstrdup(arg);
  		break;
  
  	case oMacs:
  		arg = argv_next(&ac, &av);
  		if (!arg || *arg == '\0') {
  			error("%.200s line %d: Missing argument.",
  			    filename, linenum);
  			goto out;
  		}
  		if (*arg != '-' &&
  		    !mac_valid(*arg == '+' || *arg == '^' ? arg + 1 : arg)) {
  			error("%.200s line %d: Bad SSH2 MAC spec '%s'.",
  			    filename, linenum, arg ? arg : "<NONE>");
  			goto out;
  		}
  		if (*activep && options->macs == NULL)
  			options->macs = xstrdup(arg);
  		break;
  
  	case oKexAlgorithms:
  		arg = argv_next(&ac, &av);
  		if (!arg || *arg == '\0') {
  			error("%.200s line %d: Missing argument.",
  			    filename, linenum);
  			goto out;
  		}
  		if (*arg != '-' &&
  		    !kex_names_valid(*arg == '+' || *arg == '^' ?
  		    arg + 1 : arg)) {
  			error("%.200s line %d: Bad SSH2 KexAlgorithms '%s'.",
  			    filename, linenum, arg ? arg : "<NONE>");
  			goto out;
  		}
  		if (*activep && options->kex_algorithms == NULL)
  			options->kex_algorithms = xstrdup(arg);
  		break;
  
  	case oHostKeyAlgorithms:
  		charptr = &options->hostkeyalgorithms;
  		ca_only = 0;
  parse_pubkey_algos:
  		arg = argv_next(&ac, &av);
  		if (!arg || *arg == '\0') {
  			error("%.200s line %d: Missing argument.",
  			    filename, linenum);
  			goto out;
  		}
  		if (*arg != '-' &&
  		    !sshkey_names_valid2(*arg == '+' || *arg == '^' ?
  		    arg + 1 : arg, 1, ca_only)) {
  			error("%s line %d: Bad key types '%s'.",
  			    filename, linenum, arg ? arg : "<NONE>");
  			goto out;
  		}
  		if (*activep && *charptr == NULL)
  			*charptr = xstrdup(arg);
  		break;
  
  	case oCASignatureAlgorithms:
  		charptr = &options->ca_sign_algorithms;
  		ca_only = 1;
  		goto parse_pubkey_algos;
  
  	case oLogLevel:
  		log_level_ptr = &options->log_level;
  		arg = argv_next(&ac, &av);
  		value = log_level_number(arg);
  		if (value == SYSLOG_LEVEL_NOT_SET) {
  			error("%.200s line %d: unsupported log level '%s'",
  			    filename, linenum, arg ? arg : "<NONE>");
  			goto out;
  		}
  		if (*activep && *log_level_ptr == SYSLOG_LEVEL_NOT_SET)
  			*log_level_ptr = (LogLevel) value;
  		break;
  
  	case oLogFacility:
  		log_facility_ptr = &options->log_facility;
  		arg = argv_next(&ac, &av);
  		value = log_facility_number(arg);
  		if (value == SYSLOG_FACILITY_NOT_SET) {
  			error("%.200s line %d: unsupported log facility '%s'",
  			    filename, linenum, arg ? arg : "<NONE>");
  			goto out;
  		}
  		if (*log_facility_ptr == -1)
  			*log_facility_ptr = (SyslogFacility) value;
  		break;
  
  	case oLogVerbose:
  		cppptr = &options->log_verbose;
  		uintptr = &options->num_log_verbose;
  		i = 0;
  		while ((arg = argv_next(&ac, &av)) != NULL) {
  			if (*arg == '\0') {
  				error("%s line %d: keyword %s empty argument",
  				    filename, linenum, keyword);
  				goto out;
  			}
  			/* Allow "none" only in first position */
  			if (strcasecmp(arg, "none") == 0) {
  				if (i > 0 || ac > 0) {
  					error("%s line %d: keyword %s \"none\" "
  					    "argument must appear alone.",
  					    filename, linenum, keyword);
  					goto out;
  				}
  			}
  			i++;
  			if (*activep && *uintptr == 0) {
  				*cppptr = xrecallocarray(*cppptr, *uintptr,
  				    *uintptr + 1, sizeof(**cppptr));
  				(*cppptr)[(*uintptr)++] = xstrdup(arg);
  			}
  		}
  		break;
  
  	case oLocalForward:
  	case oRemoteForward:
  	case oDynamicForward:
  		arg = argv_next(&ac, &av);
  		if (!arg || *arg == '\0') {
  			error("%.200s line %d: Missing argument.",
  			    filename, linenum);
  			goto out;
  		}
  
  		remotefwd = (opcode == oRemoteForward);
  		dynamicfwd = (opcode == oDynamicForward);
  
  		if (!dynamicfwd) {
  			arg2 = argv_next(&ac, &av);
  			if (arg2 == NULL || *arg2 == '\0') {
  				if (remotefwd)
  					dynamicfwd = 1;
  				else {
  					error("%.200s line %d: Missing target "
  					    "argument.", filename, linenum);
  					goto out;
  				}
  			} else {
  				/* construct a string for parse_forward */
  				snprintf(fwdarg, sizeof(fwdarg), "%s:%s", arg,
  				    arg2);
  			}
  		}
  		if (dynamicfwd)
  			strlcpy(fwdarg, arg, sizeof(fwdarg));
  
  		if (parse_forward(&fwd, fwdarg, dynamicfwd, remotefwd) == 0) {
  			error("%.200s line %d: Bad forwarding specification.",
  			    filename, linenum);
  			goto out;
  		}
  
  		if (*activep) {
  			if (remotefwd) {
  				add_remote_forward(options, &fwd);
  			} else {
  				add_local_forward(options, &fwd);
  			}
  		}
  		break;
  
  	case oPermitRemoteOpen:
  		uintptr = &options->num_permitted_remote_opens;
  		cppptr = &options->permitted_remote_opens;
  		found = *uintptr == 0;
  		while ((arg = argv_next(&ac, &av)) != NULL) {
  			arg2 = xstrdup(arg);
  			/* Allow any/none only in first position */
  			if (strcasecmp(arg, "none") == 0 ||
  			    strcasecmp(arg, "any") == 0) {
  				if (nstrs > 0 || ac > 0) {
  					error("%s line %d: keyword %s \"%s\" "
  					    "argument must appear alone.",
  					    filename, linenum, keyword, arg);
  					free(arg2);
  					goto out;
  				}
  			} else {
  				p = hpdelim(&arg);
  				if (p == NULL) {
  					fatal("%s line %d: missing host in %s",
  					    filename, linenum,
  					    lookup_opcode_name(opcode));
  				}
  				p = cleanhostname(p);
  				/*
  				 * don't want to use permitopen_port to avoid
  				 * dependency on channels.[ch] here.
  				 */
  				if (arg == NULL || (strcmp(arg, "*") != 0 &&
  				    a2port(arg) <= 0)) {
  					fatal("%s line %d: bad port number "
  					    "in %s", filename, linenum,
  					    lookup_opcode_name(opcode));
  				}
  			}
  			opt_array_append(filename, linenum,
  			    lookup_opcode_name(opcode),
  			    &strs, &nstrs, arg2);
  			free(arg2);
  		}
  		if (nstrs == 0)
  			fatal("%s line %d: missing %s specification",
  			    filename, linenum, lookup_opcode_name(opcode));
  		if (found && *activep) {
  			*cppptr = strs;
  			*uintptr = nstrs;
  			strs = NULL; /* transferred */
  			nstrs = 0;
  		}
  		break;
  
  	case oClearAllForwardings:
  		intptr = &options->clear_forwardings;
  		goto parse_flag;
  
  	case oHost:
  		if (cmdline) {
  			error("Host directive not supported as a command-line "
  			    "option");
  			goto out;
  		}
  		*activep = 0;
  		arg2 = NULL;
  		while ((arg = argv_next(&ac, &av)) != NULL) {
  			if (*arg == '\0') {
  				error("%s line %d: keyword %s empty argument",
  				    filename, linenum, keyword);
  				goto out;
  			}
  			if ((flags & SSHCONF_NEVERMATCH) != 0) {
  				argv_consume(&ac);
  				break;
  			}
  			negated = *arg == '!';
  			if (negated)
  				arg++;
  			if (match_pattern(host, arg)) {
  				if (negated) {
  					debug("%.200s line %d: Skipping Host "
  					    "block because of negated match "
  					    "for %.100s", filename, linenum,
  					    arg);
  					*activep = 0;
  					argv_consume(&ac);
  					break;
  				}
  				if (!*activep)
  					arg2 = arg; /* logged below */
  				*activep = 1;
  			}
  		}
  		if (*activep)
  			debug("%.200s line %d: Applying options for %.100s",
  			    filename, linenum, arg2);
  		break;
  
  	case oMatch:
  		if (cmdline) {
  			error("Host directive not supported as a command-line "
  			    "option");
  			goto out;
  		}
  		value = match_cfg_line(options, &str, pw, host, original_host,
  		    flags & SSHCONF_FINAL, want_final_pass,
  		    filename, linenum);
  		if (value < 0) {
  			error("%.200s line %d: Bad Match condition", filename,
  			    linenum);
  			goto out;
  		}
  		*activep = (flags & SSHCONF_NEVERMATCH) ? 0 : value;
  		/*
  		 * If match_cfg_line() didn't consume all its arguments then
  		 * arrange for the extra arguments check below to fail.
  		 */
  
  		if (str == NULL || *str == '\0')
  			argv_consume(&ac);
  		break;
  
  	case oEscapeChar:
  		intptr = &options->escape_char;
  		arg = argv_next(&ac, &av);
  		if (!arg || *arg == '\0') {
  			error("%.200s line %d: Missing argument.",
  			    filename, linenum);
  			goto out;
  		}
  		if (strcmp(arg, "none") == 0)
  			value = SSH_ESCAPECHAR_NONE;
  		else if (arg[1] == '\0')
  			value = (u_char) arg[0];
  		else if (arg[0] == '^' && arg[2] == 0 &&
  		    (u_char) arg[1] >= 64 && (u_char) arg[1] < 128)
  			value = (u_char) arg[1] & 31;
  		else {
  			error("%.200s line %d: Bad escape character.",
  			    filename, linenum);
  			goto out;
  		}
  		if (*activep && *intptr == -1)
  			*intptr = value;
  		break;
  
  	case oAddressFamily:
  		intptr = &options->address_family;
  		multistate_ptr = multistate_addressfamily;
  		goto parse_multistate;
  
  	case oEnableSSHKeysign:
  		intptr = &options->enable_ssh_keysign;
  		goto parse_flag;
  
  	case oIdentitiesOnly:
  		intptr = &options->identities_only;
  		goto parse_flag;
  
  	case oServerAliveInterval:
  		intptr = &options->server_alive_interval;
  		goto parse_time;
  
  	case oServerAliveCountMax:
  		intptr = &options->server_alive_count_max;
  		goto parse_int;
  
  	case oSendEnv:
  		/* XXX appends to list; doesn't respect first-match-wins */
  		while ((arg = argv_next(&ac, &av)) != NULL) {
  			if (*arg == '\0' || strchr(arg, '=') != NULL) {
  				error("%s line %d: Invalid environment name.",
  				    filename, linenum);
  				goto out;
  			}
  			found = 1;
  			if (!*activep)
  				continue;
  			if (*arg == '-') {
  				/* Removing an env var */
  				rm_env(options, arg, filename, linenum);
  				continue;
  			}
  			opt_array_append(filename, linenum,
  			    lookup_opcode_name(opcode),
  			    &options->send_env, &options->num_send_env, arg);
  		}
  		if (!found) {
  			fatal("%s line %d: no %s specified",
  			    filename, linenum, keyword);
  		}
  		break;
  
  	case oSetEnv:
  		found = options->num_setenv == 0;
  		while ((arg = argv_next(&ac, &av)) != NULL) {
  			if (strchr(arg, '=') == NULL) {
  				error("%s line %d: Invalid SetEnv.",
  				    filename, linenum);
  				goto out;
  			}
  			if (lookup_setenv_in_list(arg, strs, nstrs) != NULL) {
  				debug2("%s line %d: ignoring duplicate env "
  				    "name \"%.64s\"", filename, linenum, arg);
  				continue;
  			}
  			opt_array_append(filename, linenum,
  			    lookup_opcode_name(opcode),
  			    &strs, &nstrs, arg);
  		}
  		if (nstrs == 0) {
  			fatal("%s line %d: no %s specified",
  			    filename, linenum, keyword);
  		}
  		if (found && *activep) {
  			options->setenv = strs;
  			options->num_setenv = nstrs;
  			strs = NULL; /* transferred */
  			nstrs = 0;
  		}
  		break;
  
  	case oControlPath:
  		charptr = &options->control_path;
  		goto parse_string;
  
  	case oControlMaster:
  		intptr = &options->control_master;
  		multistate_ptr = multistate_controlmaster;
  		goto parse_multistate;
  
  	case oControlPersist:
  		/* no/false/yes/true, or a time spec */
  		intptr = &options->control_persist;
  		arg = argv_next(&ac, &av);
  		if (!arg || *arg == '\0') {
  			error("%.200s line %d: Missing ControlPersist"
  			    " argument.", filename, linenum);
  			goto out;
  		}
  		value = 0;
  		value2 = 0;	/* timeout */
  		if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0)
  			value = 0;
  		else if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0)
  			value = 1;
  		else if ((value2 = convtime(arg)) >= 0)
  			value = 1;
  		else {
  			error("%.200s line %d: Bad ControlPersist argument.",
  			    filename, linenum);
  			goto out;
  		}
  		if (*activep && *intptr == -1) {
  			*intptr = value;
  			options->control_persist_timeout = value2;
  		}
  		break;
  
  	case oHashKnownHosts:
  		intptr = &options->hash_known_hosts;
  		goto parse_flag;
  
  	case oTunnel:
  		intptr = &options->tun_open;
  		multistate_ptr = multistate_tunnel;
  		goto parse_multistate;
  
  	case oTunnelDevice:
  		arg = argv_next(&ac, &av);
  		if (!arg || *arg == '\0') {
  			error("%.200s line %d: Missing argument.",
  			    filename, linenum);
  			goto out;
  		}
  		value = a2tun(arg, &value2);
  		if (value == SSH_TUNID_ERR) {
  			error("%.200s line %d: Bad tun device.",
  			    filename, linenum);
  			goto out;
  		}
  		if (*activep && options->tun_local == -1) {
  			options->tun_local = value;
  			options->tun_remote = value2;
  		}
  		break;
  
  	case oLocalCommand:
  		charptr = &options->local_command;
  		goto parse_command;
  
  	case oPermitLocalCommand:
  		intptr = &options->permit_local_command;
  		goto parse_flag;
  
  	case oRemoteCommand:
  		charptr = &options->remote_command;
  		goto parse_command;
  
  	case oVisualHostKey:
  		intptr = &options->visual_host_key;
  		goto parse_flag;
  
  	case oInclude:
  		if (cmdline) {
  			error("Include directive not supported as a "
  			    "command-line option");
  			goto out;
  		}
  		value = 0;
  		while ((arg = argv_next(&ac, &av)) != NULL) {
  			if (*arg == '\0') {
  				error("%s line %d: keyword %s empty argument",
  				    filename, linenum, keyword);
  				goto out;
  			}
  			/*
  			 * Ensure all paths are anchored. User configuration
  			 * files may begin with '~/' but system configurations
  			 * must not. If the path is relative, then treat it
  			 * as living in ~/.ssh for user configurations or
  			 * /etc/ssh for system ones.
  			 */
  			if (*arg == '~' && (flags & SSHCONF_USERCONF) == 0) {
  				error("%.200s line %d: bad include path %s.",
  				    filename, linenum, arg);
  				goto out;
  			}
  			if (!path_absolute(arg) && *arg != '~') {
  				xasprintf(&arg2, "%s/%s",
  				    (flags & SSHCONF_USERCONF) ?
  				    "~/" _PATH_SSH_USER_DIR : SSHDIR, arg);
  			} else
  				arg2 = xstrdup(arg);
  			memset(&gl, 0, sizeof(gl));
  			r = glob(arg2, GLOB_TILDE, NULL, &gl);
  			if (r == GLOB_NOMATCH) {
  				debug("%.200s line %d: include %s matched no "
  				    "files",filename, linenum, arg2);
  				free(arg2);
  				continue;
  			} else if (r != 0) {
  				error("%.200s line %d: glob failed for %s.",
  				    filename, linenum, arg2);
  				goto out;
  			}
  			free(arg2);
  			oactive = *activep;
  			for (i = 0; i < gl.gl_pathc; i++) {
  				debug3("%.200s line %d: Including file %s "
  				    "depth %d%s", filename, linenum,
  				    gl.gl_pathv[i], depth,
  				    oactive ? "" : " (parse only)");
  				r = read_config_file_depth(gl.gl_pathv[i],
  				    pw, host, original_host, options,
  				    flags | SSHCONF_CHECKPERM |
  				    (oactive ? 0 : SSHCONF_NEVERMATCH),
  				    activep, want_final_pass, depth + 1);
  				if (r != 1 && errno != ENOENT) {
  					error("Can't open user config file "
  					    "%.100s: %.100s", gl.gl_pathv[i],
  					    strerror(errno));
  					globfree(&gl);
  					goto out;
  				}
  				/*
  				 * don't let Match in includes clobber the
  				 * containing file's Match state.
  				 */
  				*activep = oactive;
  				if (r != 1)
  					value = -1;
  			}
  			globfree(&gl);
  		}
  		if (value != 0)
  			ret = value;
  		break;
  
  	case oIPQoS:
  		arg = argv_next(&ac, &av);
  		if ((value = parse_ipqos(arg)) == -1) {
  			error("%s line %d: Bad IPQoS value: %s",
  			    filename, linenum, arg);
  			goto out;
  		}
  		arg = argv_next(&ac, &av);
  		if (arg == NULL)
  			value2 = value;
  		else if ((value2 = parse_ipqos(arg)) == -1) {
  			error("%s line %d: Bad IPQoS value: %s",
  			    filename, linenum, arg);
  			goto out;
  		}
  		if (*activep && options->ip_qos_interactive == -1) {
  			options->ip_qos_interactive = value;
  			options->ip_qos_bulk = value2;
  		}
  		break;
  
  	case oRequestTTY:
  		intptr = &options->request_tty;
  		multistate_ptr = multistate_requesttty;
  		goto parse_multistate;
  
  	case oSessionType:
  		intptr = &options->session_type;
  		multistate_ptr = multistate_sessiontype;
  		goto parse_multistate;
  
  	case oStdinNull:
  		intptr = &options->stdin_null;
  		goto parse_flag;
  
  	case oForkAfterAuthentication:
  		intptr = &options->fork_after_authentication;
  		goto parse_flag;
  
  	case oIgnoreUnknown:
  		charptr = &options->ignored_unknown;
  		goto parse_string;
  
  	case oProxyUseFdpass:
  		intptr = &options->proxy_use_fdpass;
  		goto parse_flag;
  
  	case oCanonicalDomains:
  		found = options->num_canonical_domains == 0;
  		while ((arg = argv_next(&ac, &av)) != NULL) {
  			/* Allow "none" only in first position */
  			if (strcasecmp(arg, "none") == 0) {
  				if (nstrs > 0 || ac > 0) {
  					error("%s line %d: keyword %s \"none\" "
  					    "argument must appear alone.",
  					    filename, linenum, keyword);
  					goto out;
  				}
  			}
  			if (!valid_domain(arg, 1, &errstr)) {
  				error("%s line %d: %s", filename, linenum,
  				    errstr);
  				goto out;
  			}
  			opt_array_append(filename, linenum, keyword,
  			    &strs, &nstrs, arg);
  		}
  		if (nstrs == 0) {
  			fatal("%s line %d: no %s specified",
  			    filename, linenum, keyword);
  		}
  		if (found && *activep) {
  			options->canonical_domains = strs;
  			options->num_canonical_domains = nstrs;
  			strs = NULL; /* transferred */
  			nstrs = 0;
  		}
  		break;
  
  	case oCanonicalizePermittedCNAMEs:
  		found = options->num_permitted_cnames == 0;
  		while ((arg = argv_next(&ac, &av)) != NULL) {
  			/*
  			 * Either 'none' (only in first position), '*' for
  			 * everything or 'list:list'
  			 */
  			if (strcasecmp(arg, "none") == 0) {
  				if (ncnames > 0 || ac > 0) {
  					error("%s line %d: keyword %s \"none\" "
  					    "argument must appear alone.",
  					    filename, linenum, keyword);
  					goto out;
  				}
  				arg2 = "";
  			} else if (strcmp(arg, "*") == 0) {
  				arg2 = arg;
  			} else {
  				lowercase(arg);
  				if ((arg2 = strchr(arg, ':')) == NULL ||
  				    arg2[1] == '\0') {
  					error("%s line %d: "
  					    "Invalid permitted CNAME \"%s\"",
  					    filename, linenum, arg);
  					goto out;
  				}
  				*arg2 = '\0';
  				arg2++;
  			}
  			cnames = xrecallocarray(cnames, ncnames, ncnames + 1,
  			    sizeof(*cnames));
  			cnames[ncnames].source_list = xstrdup(arg);
  			cnames[ncnames].target_list = xstrdup(arg2);
  			ncnames++;
  		}
  		if (ncnames == 0) {
  			fatal("%s line %d: no %s specified",
  			    filename, linenum, keyword);
  		}
  		if (found && *activep) {
  			options->permitted_cnames = cnames;
  			options->num_permitted_cnames = ncnames;
  			cnames = NULL; /* transferred */
  			ncnames = 0;
  		}
  		/* un-transferred cnames is cleaned up before exit */
  		break;
  
  	case oCanonicalizeHostname:
  		intptr = &options->canonicalize_hostname;
  		multistate_ptr = multistate_canonicalizehostname;
  		goto parse_multistate;
  
  	case oCanonicalizeMaxDots:
  		intptr = &options->canonicalize_max_dots;
  		goto parse_int;
  
  	case oCanonicalizeFallbackLocal:
  		intptr = &options->canonicalize_fallback_local;
  		goto parse_flag;
  
  	case oStreamLocalBindMask:
  		arg = argv_next(&ac, &av);
  		if (!arg || *arg == '\0') {
  			error("%.200s line %d: Missing StreamLocalBindMask "
  			    "argument.", filename, linenum);
  			goto out;
  		}
  		/* Parse mode in octal format */
  		value = strtol(arg, &endofnumber, 8);
  		if (arg == endofnumber || value < 0 || value > 0777) {
  			error("%.200s line %d: Bad mask.", filename, linenum);
  			goto out;
  		}
  		options->fwd_opts.streamlocal_bind_mask = (mode_t)value;
  		break;
  
  	case oStreamLocalBindUnlink:
  		intptr = &options->fwd_opts.streamlocal_bind_unlink;
  		goto parse_flag;
  
  	case oRevokedHostKeys:
  		charptr = &options->revoked_host_keys;
  		goto parse_string;
  
  	case oFingerprintHash:
  		intptr = &options->fingerprint_hash;
  		arg = argv_next(&ac, &av);
  		if (!arg || *arg == '\0') {
  			error("%.200s line %d: Missing argument.",
  			    filename, linenum);
  			goto out;
  		}
  		if ((value = ssh_digest_alg_by_name(arg)) == -1) {
  			error("%.200s line %d: Invalid hash algorithm \"%s\".",
  			    filename, linenum, arg);
  			goto out;
  		}
  		if (*activep && *intptr == -1)
  			*intptr = value;
  		break;
  
  	case oUpdateHostkeys:
  		intptr = &options->update_hostkeys;
  		multistate_ptr = multistate_yesnoask;
  		goto parse_multistate;
  
  	case oHostbasedAcceptedAlgorithms:
  		charptr = &options->hostbased_accepted_algos;
  		ca_only = 0;
  		goto parse_pubkey_algos;
  
  	case oPubkeyAcceptedAlgorithms:
  		charptr = &options->pubkey_accepted_algos;
  		ca_only = 0;
  		goto parse_pubkey_algos;
  
  	case oAddKeysToAgent:
  		arg = argv_next(&ac, &av);
  		arg2 = argv_next(&ac, &av);
  		value = parse_multistate_value(arg, filename, linenum,
  		    multistate_yesnoaskconfirm);
  		value2 = 0; /* unlimited lifespan by default */
  		if (value == 3 && arg2 != NULL) {
  			/* allow "AddKeysToAgent confirm 5m" */
  			if ((value2 = convtime(arg2)) == -1) {
  				error("%s line %d: invalid time value.",
  				    filename, linenum);
  				goto out;
  			}
  		} else if (value == -1 && arg2 == NULL) {
  			if ((value2 = convtime(arg)) == -1) {
  				error("%s line %d: unsupported option",
  				    filename, linenum);
  				goto out;
  			}
  			value = 1; /* yes */
  		} else if (value == -1 || arg2 != NULL) {
  			error("%s line %d: unsupported option",
  			    filename, linenum);
  			goto out;
  		}
  		if (*activep && options->add_keys_to_agent == -1) {
  			options->add_keys_to_agent = value;
  			options->add_keys_to_agent_lifespan = value2;
  		}
  		break;
  
  	case oIdentityAgent:
  		charptr = &options->identity_agent;
  		arg = argv_next(&ac, &av);
  		if (!arg || *arg == '\0') {
  			error("%.200s line %d: Missing argument.",
  			    filename, linenum);
  			goto out;
  		}
    parse_agent_path:
  		/* Extra validation if the string represents an env var. */
  		if ((arg2 = dollar_expand(&r, arg)) == NULL || r) {
  			error("%.200s line %d: Invalid environment expansion "
  			    "%s.", filename, linenum, arg);
  			goto out;
  		}
  		free(arg2);
  		/* check for legacy environment format */
  		if (arg[0] == '$' && arg[1] != '{' &&
  		    !valid_env_name(arg + 1)) {
  			error("%.200s line %d: Invalid environment name %s.",
  			    filename, linenum, arg);
  			goto out;
  		}
  		if (*activep && *charptr == NULL)
  			*charptr = xstrdup(arg);
  		break;
  
  	case oEnableEscapeCommandline:
  		intptr = &options->enable_escape_commandline;
  		goto parse_flag;
  
  	case oRequiredRSASize:
  		intptr = &options->required_rsa_size;
  		goto parse_int;
  
  	case oObscureKeystrokeTiming:
  		value = -1;
  		while ((arg = argv_next(&ac, &av)) != NULL) {
  			if (value != -1) {
  				error("%s line %d: invalid arguments",
  				    filename, linenum);
  				goto out;
  			}
  			if (strcmp(arg, "yes") == 0 ||
  			    strcmp(arg, "true") == 0)
  				value = SSH_KEYSTROKE_DEFAULT_INTERVAL_MS;
  			else if (strcmp(arg, "no") == 0 ||
  			    strcmp(arg, "false") == 0)
  				value = 0;
  			else if (strncmp(arg, "interval:", 9) == 0) {
  				if ((errstr = atoi_err(arg + 9,
  				    &value)) != NULL) {
  					error("%s line %d: integer value %s.",
  					    filename, linenum, errstr);
  					goto out;
  				}
  				if (value <= 0 || value > 1000) {
  					error("%s line %d: value out of range.",
  					    filename, linenum);
  					goto out;
  				}
  			} else {
  				error("%s line %d: unsupported argument \"%s\"",
  				    filename, linenum, arg);
  				goto out;
  			}
  		}
  		if (value == -1) {
  			error("%s line %d: missing argument",
  			    filename, linenum);
  			goto out;
  		}
  		intptr = &options->obscure_keystroke_timing_interval;
  		if (*activep && *intptr == -1)
  			*intptr = value;
  		break;
  
  	case oChannelTimeout:
  		found = options->num_channel_timeouts == 0;
  		while ((arg = argv_next(&ac, &av)) != NULL) {
  			/* Allow "none" only in first position */
  			if (strcasecmp(arg, "none") == 0) {
  				if (nstrs > 0 || ac > 0) {
  					error("%s line %d: keyword %s \"none\" "
  					    "argument must appear alone.",
  					    filename, linenum, keyword);
  					goto out;
  				}
  			} else if (parse_pattern_interval(arg,
  			    NULL, NULL) != 0) {
  				fatal("%s line %d: invalid channel timeout %s",
  				    filename, linenum, arg);
  			}
  			opt_array_append(filename, linenum, keyword,
  			    &strs, &nstrs, arg);
  		}
  		if (nstrs == 0) {
  			fatal("%s line %d: no %s specified",
  			    filename, linenum, keyword);
  		}
  		if (found && *activep) {
  			options->channel_timeouts = strs;
  			options->num_channel_timeouts = nstrs;
  			strs = NULL; /* transferred */
  			nstrs = 0;
  		}
  		break;
  
  	case oDeprecated:
  		debug("%s line %d: Deprecated option \"%s\"",
  		    filename, linenum, keyword);
  		argv_consume(&ac);
  		break;
  
  	case oUnsupported:
  		error("%s line %d: Unsupported option \"%s\"",
  		    filename, linenum, keyword);
  		argv_consume(&ac);
  		break;
  
  	default:
  		error("%s line %d: Unimplemented opcode %d",
  		    filename, linenum, opcode);
  		goto out;
  	}
  
  	/* Check that there is no garbage at end of line. */
  	if (ac > 0) {
  		error("%.200s line %d: keyword %s extra arguments "
  		    "at end of line", filename, linenum, keyword);
  		goto out;
  	}
  
  	/* success */
  	ret = 0;
   out:
  	free_canon_cnames(cnames, ncnames);
  	opt_array_free2(strs, NULL, nstrs);
  	argv_free(oav, oac);
  	return ret;
  }
  
  /*
   * Reads the config file and modifies the options accordingly.  Options
   * should already be initialized before this call.  This never returns if
   * there is an error.  If the file does not exist, this returns 0.
   */
  int
  read_config_file(const char *filename, struct passwd *pw, const char *host,
      const char *original_host, Options *options, int flags,
      int *want_final_pass)
  {
  	int active = 1;
  
  	return read_config_file_depth(filename, pw, host, original_host,
  	    options, flags, &active, want_final_pass, 0);
  }
  
  #define READCONF_MAX_DEPTH	16
  static int
  read_config_file_depth(const char *filename, struct passwd *pw,
      const char *host, const char *original_host, Options *options,
      int flags, int *activep, int *want_final_pass, int depth)
  {
  	FILE *f;
  	char *line = NULL;
  	size_t linesize = 0;
  	int linenum;
  	int bad_options = 0;
  
  	if (depth < 0 || depth > READCONF_MAX_DEPTH)
  		fatal("Too many recursive configuration includes");
  
  	if ((f = fopen(filename, "r")) == NULL)
  		return 0;
  
  	if (flags & SSHCONF_CHECKPERM) {
  		struct stat sb;
  
  		if (fstat(fileno(f), &sb) == -1)
  			fatal("fstat %s: %s", filename, strerror(errno));
  		if (((sb.st_uid != 0 && sb.st_uid != getuid()) ||
  		    (sb.st_mode & 022) != 0))
  			fatal("Bad owner or permissions on %s", filename);
  	}
  
  	debug("Reading configuration data %.200s", filename);
  
  	/*
  	 * Mark that we are now processing the options.  This flag is turned
  	 * on/off by Host specifications.
  	 */
  	linenum = 0;
  	while (getline(&line, &linesize, f) != -1) {
  		/* Update line number counter. */
  		linenum++;
  		/*
  		 * Trim out comments and strip whitespace.
  		 * NB - preserve newlines, they are needed to reproduce
  		 * line numbers later for error messages.
  		 */
  		if (process_config_line_depth(options, pw, host, original_host,
  		    line, filename, linenum, activep, flags, want_final_pass,
  		    depth) != 0)
  			bad_options++;
  	}
  	free(line);
  	fclose(f);
  	if (bad_options > 0)
  		fatal("%s: terminating, %d bad configuration options",
  		    filename, bad_options);
  	return 1;
  }
  
  /* Returns 1 if a string option is unset or set to "none" or 0 otherwise. */
  int
  option_clear_or_none(const char *o)
  {
  	return o == NULL || strcasecmp(o, "none") == 0;
  }
  
  /*
   * Returns 1 if CanonicalizePermittedCNAMEs have been specified, 0 otherwise.
   * Allowed to be called on non-final configuration.
   */
  int
  config_has_permitted_cnames(Options *options)
  {
  	if (options->num_permitted_cnames == 1 &&
  	    strcasecmp(options->permitted_cnames[0].source_list, "none") == 0 &&
  	    strcmp(options->permitted_cnames[0].target_list, "") == 0)
  		return 0;
  	return options->num_permitted_cnames > 0;
  }
  
  /*
   * Initializes options to special values that indicate that they have not yet
   * been set.  Read_config_file will only set options with this value. Options
   * are processed in the following order: command line, user config file,
   * system config file.  Last, fill_default_options is called.
   */
  
  void
  initialize_options(Options * options)
  {
  	memset(options, 'X', sizeof(*options));
  	options->host_arg = NULL;
  	options->forward_agent = -1;
  	options->forward_agent_sock_path = NULL;
  	options->forward_x11 = -1;
  	options->forward_x11_trusted = -1;
  	options->forward_x11_timeout = -1;
  	options->stdio_forward_host = NULL;
  	options->stdio_forward_port = 0;
  	options->clear_forwardings = -1;
  	options->exit_on_forward_failure = -1;
  	options->xauth_location = NULL;
  	options->fwd_opts.gateway_ports = -1;
  	options->fwd_opts.streamlocal_bind_mask = (mode_t)-1;
  	options->fwd_opts.streamlocal_bind_unlink = -1;
  	options->pubkey_authentication = -1;
  	options->gss_authentication = -1;
  	options->gss_deleg_creds = -1;
  	options->password_authentication = -1;
  	options->kbd_interactive_authentication = -1;
  	options->kbd_interactive_devices = NULL;
  	options->hostbased_authentication = -1;
  	options->batch_mode = -1;
  	options->check_host_ip = -1;
  	options->strict_host_key_checking = -1;
  	options->compression = -1;
  	options->tcp_keep_alive = -1;
  	options->port = -1;
  	options->address_family = -1;
  	options->connection_attempts = -1;
  	options->connection_timeout = -1;
  	options->number_of_password_prompts = -1;
  	options->ciphers = NULL;
  	options->macs = NULL;
  	options->kex_algorithms = NULL;
  	options->hostkeyalgorithms = NULL;
  	options->ca_sign_algorithms = NULL;
  	options->num_identity_files = 0;
  	memset(options->identity_keys, 0, sizeof(options->identity_keys));
  	options->num_certificate_files = 0;
  	memset(options->certificates, 0, sizeof(options->certificates));
  	options->hostname = NULL;
  	options->host_key_alias = NULL;
  	options->proxy_command = NULL;
  	options->jump_user = NULL;
  	options->jump_host = NULL;
  	options->jump_port = -1;
  	options->jump_extra = NULL;
  	options->user = NULL;
  	options->escape_char = -1;
  	options->num_system_hostfiles = 0;
  	options->num_user_hostfiles = 0;
  	options->local_forwards = NULL;
  	options->num_local_forwards = 0;
  	options->remote_forwards = NULL;
  	options->num_remote_forwards = 0;
  	options->permitted_remote_opens = NULL;
  	options->num_permitted_remote_opens = 0;
  	options->log_facility = SYSLOG_FACILITY_NOT_SET;
  	options->log_level = SYSLOG_LEVEL_NOT_SET;
  	options->num_log_verbose = 0;
  	options->log_verbose = NULL;
  	options->preferred_authentications = NULL;
  	options->bind_address = NULL;
  	options->bind_interface = NULL;
  	options->pkcs11_provider = NULL;
  	options->sk_provider = NULL;
  	options->enable_ssh_keysign = - 1;
  	options->no_host_authentication_for_localhost = - 1;
  	options->identities_only = - 1;
  	options->rekey_limit = - 1;
  	options->rekey_interval = -1;
  	options->verify_host_key_dns = -1;
  	options->server_alive_interval = -1;
  	options->server_alive_count_max = -1;
  	options->send_env = NULL;
  	options->num_send_env = 0;
  	options->setenv = NULL;
  	options->num_setenv = 0;
  	options->control_path = NULL;
  	options->control_master = -1;
  	options->control_persist = -1;
  	options->control_persist_timeout = 0;
  	options->hash_known_hosts = -1;
  	options->tun_open = -1;
  	options->tun_local = -1;
  	options->tun_remote = -1;
  	options->local_command = NULL;
  	options->permit_local_command = -1;
  	options->remote_command = NULL;
  	options->add_keys_to_agent = -1;
  	options->add_keys_to_agent_lifespan = -1;
  	options->identity_agent = NULL;
  	options->visual_host_key = -1;
  	options->ip_qos_interactive = -1;
  	options->ip_qos_bulk = -1;
  	options->request_tty = -1;
  	options->session_type = -1;
  	options->stdin_null = -1;
  	options->fork_after_authentication = -1;
  	options->proxy_use_fdpass = -1;
  	options->ignored_unknown = NULL;
  	options->num_canonical_domains = 0;
  	options->num_permitted_cnames = 0;
  	options->canonicalize_max_dots = -1;
  	options->canonicalize_fallback_local = -1;
  	options->canonicalize_hostname = -1;
  	options->revoked_host_keys = NULL;
  	options->fingerprint_hash = -1;
  	options->update_hostkeys = -1;
  	options->hostbased_accepted_algos = NULL;
  	options->pubkey_accepted_algos = NULL;
  	options->known_hosts_command = NULL;
  	options->required_rsa_size = -1;
  	options->enable_escape_commandline = -1;
  	options->obscure_keystroke_timing_interval = -1;
  	options->tag = NULL;
  	options->channel_timeouts = NULL;
  	options->num_channel_timeouts = 0;
  }
  
  /*
   * A petite version of fill_default_options() that just fills the options
   * needed for hostname canonicalization to proceed.
   */
  void
  fill_default_options_for_canonicalization(Options *options)
  {
  	if (options->canonicalize_max_dots == -1)
  		options->canonicalize_max_dots = 1;
  	if (options->canonicalize_fallback_local == -1)
  		options->canonicalize_fallback_local = 1;
  	if (options->canonicalize_hostname == -1)
  		options->canonicalize_hostname = SSH_CANONICALISE_NO;
  }
  
  /*
   * Called after processing other sources of option data, this fills those
   * options for which no value has been specified with their default values.
   */
  int
  fill_default_options(Options * options)
  {
  	char *all_cipher, *all_mac, *all_kex, *all_key, *all_sig;
  	char *def_cipher, *def_mac, *def_kex, *def_key, *def_sig;
  	int ret = 0, r;
  
  	if (options->forward_agent == -1)
  		options->forward_agent = 0;
  	if (options->forward_x11 == -1)
  		options->forward_x11 = 0;
  	if (options->forward_x11_trusted == -1)
  		options->forward_x11_trusted = 0;
  	if (options->forward_x11_timeout == -1)
  		options->forward_x11_timeout = 1200;
  	/*
  	 * stdio forwarding (-W) changes the default for these but we defer
  	 * setting the values so they can be overridden.
  	 */
  	if (options->exit_on_forward_failure == -1)
  		options->exit_on_forward_failure =
  		    options->stdio_forward_host != NULL ? 1 : 0;
  	if (options->clear_forwardings == -1)
  		options->clear_forwardings =
  		    options->stdio_forward_host != NULL ? 1 : 0;
  	if (options->clear_forwardings == 1)
  		clear_forwardings(options);
  
  	if (options->xauth_location == NULL)
  		options->xauth_location = xstrdup(_PATH_XAUTH);
  	if (options->fwd_opts.gateway_ports == -1)
  		options->fwd_opts.gateway_ports = 0;
  	if (options->fwd_opts.streamlocal_bind_mask == (mode_t)-1)
  		options->fwd_opts.streamlocal_bind_mask = 0177;
  	if (options->fwd_opts.streamlocal_bind_unlink == -1)
  		options->fwd_opts.streamlocal_bind_unlink = 0;
  	if (options->pubkey_authentication == -1)
  		options->pubkey_authentication = SSH_PUBKEY_AUTH_ALL;
  	if (options->gss_authentication == -1)
  		options->gss_authentication = 0;
  	if (options->gss_deleg_creds == -1)
  		options->gss_deleg_creds = 0;
  	if (options->password_authentication == -1)
  		options->password_authentication = 1;
  	if (options->kbd_interactive_authentication == -1)
  		options->kbd_interactive_authentication = 1;
  	if (options->hostbased_authentication == -1)
  		options->hostbased_authentication = 0;
  	if (options->batch_mode == -1)
  		options->batch_mode = 0;
  	if (options->check_host_ip == -1)
  		options->check_host_ip = 0;
  	if (options->strict_host_key_checking == -1)
  		options->strict_host_key_checking = SSH_STRICT_HOSTKEY_ASK;
  	if (options->compression == -1)
  		options->compression = 0;
  	if (options->tcp_keep_alive == -1)
  		options->tcp_keep_alive = 1;
  	if (options->port == -1)
  		options->port = 0;	/* Filled in ssh_connect. */
  	if (options->address_family == -1)
  		options->address_family = AF_UNSPEC;
  	if (options->connection_attempts == -1)
  		options->connection_attempts = 1;
  	if (options->number_of_password_prompts == -1)
  		options->number_of_password_prompts = 3;
  	/* options->hostkeyalgorithms, default set in myproposals.h */
  	if (options->add_keys_to_agent == -1) {
  		options->add_keys_to_agent = 0;
  		options->add_keys_to_agent_lifespan = 0;
  	}
  	if (options->num_identity_files == 0) {
  		add_identity_file(options, "~/", _PATH_SSH_CLIENT_ID_RSA, 0);
  		add_identity_file(options, "~/", _PATH_SSH_CLIENT_ID_ECDSA, 0);
  		add_identity_file(options, "~/",
  		    _PATH_SSH_CLIENT_ID_ECDSA_SK, 0);
  		add_identity_file(options, "~/",
  		    _PATH_SSH_CLIENT_ID_ED25519, 0);
  		add_identity_file(options, "~/",
  		    _PATH_SSH_CLIENT_ID_ED25519_SK, 0);
  		add_identity_file(options, "~/", _PATH_SSH_CLIENT_ID_XMSS, 0);
  #ifdef WITH_DSA
  		add_identity_file(options, "~/", _PATH_SSH_CLIENT_ID_DSA, 0);
  #endif
  	}
  	if (options->escape_char == -1)
  		options->escape_char = '~';
  	if (options->num_system_hostfiles == 0) {
  		options->system_hostfiles[options->num_system_hostfiles++] =
  		    xstrdup(_PATH_SSH_SYSTEM_HOSTFILE);
  		options->system_hostfiles[options->num_system_hostfiles++] =
  		    xstrdup(_PATH_SSH_SYSTEM_HOSTFILE2);
  	}
  	if (options->update_hostkeys == -1) {
  		if (options->verify_host_key_dns <= 0 &&
  		    (options->num_user_hostfiles == 0 ||
  		    (options->num_user_hostfiles == 1 && strcmp(options->
  		    user_hostfiles[0], _PATH_SSH_USER_HOSTFILE) == 0)))
  			options->update_hostkeys = SSH_UPDATE_HOSTKEYS_YES;
  		else
  			options->update_hostkeys = SSH_UPDATE_HOSTKEYS_NO;
  	}
  	if (options->num_user_hostfiles == 0) {
  		options->user_hostfiles[options->num_user_hostfiles++] =
  		    xstrdup(_PATH_SSH_USER_HOSTFILE);
  		options->user_hostfiles[options->num_user_hostfiles++] =
  		    xstrdup(_PATH_SSH_USER_HOSTFILE2);
  	}
  	if (options->log_level == SYSLOG_LEVEL_NOT_SET)
  		options->log_level = SYSLOG_LEVEL_INFO;
  	if (options->log_facility == SYSLOG_FACILITY_NOT_SET)
  		options->log_facility = SYSLOG_FACILITY_USER;
  	if (options->no_host_authentication_for_localhost == - 1)
  		options->no_host_authentication_for_localhost = 0;
  	if (options->identities_only == -1)
  		options->identities_only = 0;
  	if (options->enable_ssh_keysign == -1)
  		options->enable_ssh_keysign = 0;
  	if (options->rekey_limit == -1)
  		options->rekey_limit = 0;
  	if (options->rekey_interval == -1)
  		options->rekey_interval = 0;
  	if (options->verify_host_key_dns == -1)
  		options->verify_host_key_dns = 0;
  	if (options->server_alive_interval == -1)
  		options->server_alive_interval = 0;
  	if (options->server_alive_count_max == -1)
  		options->server_alive_count_max = 3;
  	if (options->control_master == -1)
  		options->control_master = 0;
  	if (options->control_persist == -1) {
  		options->control_persist = 0;
  		options->control_persist_timeout = 0;
  	}
  	if (options->hash_known_hosts == -1)
  		options->hash_known_hosts = 0;
  	if (options->tun_open == -1)
  		options->tun_open = SSH_TUNMODE_NO;
  	if (options->tun_local == -1)
  		options->tun_local = SSH_TUNID_ANY;
  	if (options->tun_remote == -1)
  		options->tun_remote = SSH_TUNID_ANY;
  	if (options->permit_local_command == -1)
  		options->permit_local_command = 0;
  	if (options->visual_host_key == -1)
  		options->visual_host_key = 0;
  	if (options->ip_qos_interactive == -1)
  		options->ip_qos_interactive = IPTOS_DSCP_AF21;
  	if (options->ip_qos_bulk == -1)
  		options->ip_qos_bulk = IPTOS_DSCP_CS1;
  	if (options->request_tty == -1)
  		options->request_tty = REQUEST_TTY_AUTO;
  	if (options->session_type == -1)
  		options->session_type = SESSION_TYPE_DEFAULT;
  	if (options->stdin_null == -1)
  		options->stdin_null = 0;
  	if (options->fork_after_authentication == -1)
  		options->fork_after_authentication = 0;
  	if (options->proxy_use_fdpass == -1)
  		options->proxy_use_fdpass = 0;
  	if (options->canonicalize_max_dots == -1)
  		options->canonicalize_max_dots = 1;
  	if (options->canonicalize_fallback_local == -1)
  		options->canonicalize_fallback_local = 1;
  	if (options->canonicalize_hostname == -1)
  		options->canonicalize_hostname = SSH_CANONICALISE_NO;
  	if (options->fingerprint_hash == -1)
  		options->fingerprint_hash = SSH_FP_HASH_DEFAULT;
  	if (options->sk_provider == NULL)
  		options->sk_provider = xstrdup("internal");
  	if (options->required_rsa_size == -1)
  		options->required_rsa_size = SSH_RSA_MINIMUM_MODULUS_SIZE;
  	if (options->enable_escape_commandline == -1)
  		options->enable_escape_commandline = 0;
  	if (options->obscure_keystroke_timing_interval == -1) {
  		options->obscure_keystroke_timing_interval =
  		    SSH_KEYSTROKE_DEFAULT_INTERVAL_MS;
  	}
  
  	/* Expand KEX name lists */
  	all_cipher = cipher_alg_list(',', 0);
  	all_mac = mac_alg_list(',');
  	all_kex = kex_alg_list(',');
  	all_key = sshkey_alg_list(0, 0, 1, ',');
  	all_sig = sshkey_alg_list(0, 1, 1, ',');
  	/* remove unsupported algos from default lists */
  	def_cipher = match_filter_allowlist(KEX_CLIENT_ENCRYPT, all_cipher);
  	def_mac = match_filter_allowlist(KEX_CLIENT_MAC, all_mac);
  	def_kex = match_filter_allowlist(KEX_CLIENT_KEX, all_kex);
  	def_key = match_filter_allowlist(KEX_DEFAULT_PK_ALG, all_key);
  	def_sig = match_filter_allowlist(SSH_ALLOWED_CA_SIGALGS, all_sig);
  #define ASSEMBLE(what, defaults, all) \
  	do { \
  		if ((r = kex_assemble_names(&options->what, \
  		    defaults, all)) != 0) { \
  			error_fr(r, "%s", #what); \
  			goto fail; \
  		} \
  	} while (0)
  	ASSEMBLE(ciphers, def_cipher, all_cipher);
  	ASSEMBLE(macs, def_mac, all_mac);
  	ASSEMBLE(kex_algorithms, def_kex, all_kex);
  	ASSEMBLE(hostbased_accepted_algos, def_key, all_key);
  	ASSEMBLE(pubkey_accepted_algos, def_key, all_key);
  	ASSEMBLE(ca_sign_algorithms, def_sig, all_sig);
  #undef ASSEMBLE
  
  #define CLEAR_ON_NONE(v) \
  	do { \
  		if (option_clear_or_none(v)) { \
  			free(v); \
  			v = NULL; \
  		} \
  	} while(0)
  #define CLEAR_ON_NONE_ARRAY(v, nv, none) \
  	do { \
  		if (options->nv == 1 && \
  		    strcasecmp(options->v[0], none) == 0) { \
  			free(options->v[0]); \
  			free(options->v); \
  			options->v = NULL; \
  			options->nv = 0; \
  		} \
  	} while (0)
  	CLEAR_ON_NONE(options->local_command);
  	CLEAR_ON_NONE(options->remote_command);
  	CLEAR_ON_NONE(options->proxy_command);
  	CLEAR_ON_NONE(options->control_path);
  	CLEAR_ON_NONE(options->revoked_host_keys);
  	CLEAR_ON_NONE(options->pkcs11_provider);
  	CLEAR_ON_NONE(options->sk_provider);
  	CLEAR_ON_NONE(options->known_hosts_command);
  	CLEAR_ON_NONE_ARRAY(channel_timeouts, num_channel_timeouts, "none");
  #undef CLEAR_ON_NONE
  #undef CLEAR_ON_NONE_ARRAY
  	if (options->jump_host != NULL &&
  	    strcmp(options->jump_host, "none") == 0 &&
  	    options->jump_port == 0 && options->jump_user == NULL) {
  		free(options->jump_host);
  		options->jump_host = NULL;
  	}
  	if (options->num_permitted_cnames == 1 &&
  	    !config_has_permitted_cnames(options)) {
  		/* clean up CanonicalizePermittedCNAMEs=none */
  		free(options->permitted_cnames[0].source_list);
  		free(options->permitted_cnames[0].target_list);
  		memset(options->permitted_cnames, '\0',
  		    sizeof(*options->permitted_cnames));
  		options->num_permitted_cnames = 0;
  	}
  	/* options->identity_agent distinguishes NULL from 'none' */
  	/* options->user will be set in the main program if appropriate */
  	/* options->hostname will be set in the main program if appropriate */
  	/* options->host_key_alias should not be set by default */
  	/* options->preferred_authentications will be set in ssh */
  
  	/* success */
  	ret = 0;
   fail:
  	free(all_cipher);
  	free(all_mac);
  	free(all_kex);
  	free(all_key);
  	free(all_sig);
  	free(def_cipher);
  	free(def_mac);
  	free(def_kex);
  	free(def_key);
  	free(def_sig);
  	return ret;
  }
  
  void
  free_options(Options *o)
  {
  	int i;
  
  	if (o == NULL)
  		return;
  
  #define FREE_ARRAY(type, n, a) \
  	do { \
  		type _i; \
  		for (_i = 0; _i < (n); _i++) \
  			free((a)[_i]); \
  	} while (0)
  
  	free(o->forward_agent_sock_path);
  	free(o->xauth_location);
  	FREE_ARRAY(u_int, o->num_log_verbose, o->log_verbose);
  	free(o->log_verbose);
  	free(o->ciphers);
  	free(o->macs);
  	free(o->hostkeyalgorithms);
  	free(o->kex_algorithms);
  	free(o->ca_sign_algorithms);
  	free(o->hostname);
  	free(o->host_key_alias);
  	free(o->proxy_command);
  	free(o->user);
  	FREE_ARRAY(u_int, o->num_system_hostfiles, o->system_hostfiles);
  	FREE_ARRAY(u_int, o->num_user_hostfiles, o->user_hostfiles);
  	free(o->preferred_authentications);
  	free(o->bind_address);
  	free(o->bind_interface);
  	free(o->pkcs11_provider);
  	free(o->sk_provider);
  	for (i = 0; i < o->num_identity_files; i++) {
  		free(o->identity_files[i]);
  		sshkey_free(o->identity_keys[i]);
  	}
  	for (i = 0; i < o->num_certificate_files; i++) {
  		free(o->certificate_files[i]);
  		sshkey_free(o->certificates[i]);
  	}
  	free(o->identity_agent);
  	for (i = 0; i < o->num_local_forwards; i++) {
  		free(o->local_forwards[i].listen_host);
  		free(o->local_forwards[i].listen_path);
  		free(o->local_forwards[i].connect_host);
  		free(o->local_forwards[i].connect_path);
  	}
  	free(o->local_forwards);
  	for (i = 0; i < o->num_remote_forwards; i++) {
  		free(o->remote_forwards[i].listen_host);
  		free(o->remote_forwards[i].listen_path);
  		free(o->remote_forwards[i].connect_host);
  		free(o->remote_forwards[i].connect_path);
  	}
  	free(o->remote_forwards);
  	free(o->stdio_forward_host);
  	FREE_ARRAY(u_int, o->num_send_env, o->send_env);
  	free(o->send_env);
  	FREE_ARRAY(u_int, o->num_setenv, o->setenv);
  	free(o->setenv);
  	free(o->control_path);
  	free(o->local_command);
  	free(o->remote_command);
  	FREE_ARRAY(int, o->num_canonical_domains, o->canonical_domains);
  	for (i = 0; i < o->num_permitted_cnames; i++) {
  		free(o->permitted_cnames[i].source_list);
  		free(o->permitted_cnames[i].target_list);
  	}
  	free(o->revoked_host_keys);
  	free(o->hostbased_accepted_algos);
  	free(o->pubkey_accepted_algos);
  	free(o->jump_user);
  	free(o->jump_host);
  	free(o->jump_extra);
  	free(o->ignored_unknown);
  	explicit_bzero(o, sizeof(*o));
  #undef FREE_ARRAY
  }
  
  struct fwdarg {
  	char *arg;
  	int ispath;
  };
  
  /*
   * parse_fwd_field
   * parses the next field in a port forwarding specification.
   * sets fwd to the parsed field and advances p past the colon
   * or sets it to NULL at end of string.
   * returns 0 on success, else non-zero.
   */
  static int
  parse_fwd_field(char **p, struct fwdarg *fwd)
  {
  	char *ep, *cp = *p;
  	int ispath = 0;
  
  	if (*cp == '\0') {
  		*p = NULL;
  		return -1;	/* end of string */
  	}
  
  	/*
  	 * A field escaped with square brackets is used literally.
  	 * XXX - allow ']' to be escaped via backslash?
  	 */
  	if (*cp == '[') {
  		/* find matching ']' */
  		for (ep = cp + 1; *ep != ']' && *ep != '\0'; ep++) {
  			if (*ep == '/')
  				ispath = 1;
  		}
  		/* no matching ']' or not at end of field. */
  		if (ep[0] != ']' || (ep[1] != ':' && ep[1] != '\0'))
  			return -1;
  		/* NUL terminate the field and advance p past the colon */
  		*ep++ = '\0';
  		if (*ep != '\0')
  			*ep++ = '\0';
  		fwd->arg = cp + 1;
  		fwd->ispath = ispath;
  		*p = ep;
  		return 0;
  	}
  
  	for (cp = *p; *cp != '\0'; cp++) {
  		switch (*cp) {
  		case '\\':
  			memmove(cp, cp + 1, strlen(cp + 1) + 1);
  			if (*cp == '\0')
  				return -1;
  			break;
  		case '/':
  			ispath = 1;
  			break;
  		case ':':
  			*cp++ = '\0';
  			goto done;
  		}
  	}
  done:
  	fwd->arg = *p;
  	fwd->ispath = ispath;
  	*p = cp;
  	return 0;
  }
  
  /*
   * parse_forward
   * parses a string containing a port forwarding specification of the form:
   *   dynamicfwd == 0
   *	[listenhost:]listenport|listenpath:connecthost:connectport|connectpath
   *	listenpath:connectpath
   *   dynamicfwd == 1
   *	[listenhost:]listenport
   * returns number of arguments parsed or zero on error
   */
  int
  parse_forward(struct Forward *fwd, const char *fwdspec, int dynamicfwd, int remotefwd)
  {
  	struct fwdarg fwdargs[4];
  	char *p, *cp;
  	int i, err;
  
  	memset(fwd, 0, sizeof(*fwd));
  	memset(fwdargs, 0, sizeof(fwdargs));
  
  	/*
  	 * We expand environment variables before checking if we think they're
  	 * paths so that if ${VAR} expands to a fully qualified path it is
  	 * treated as a path.
  	 */
  	cp = p = dollar_expand(&err, fwdspec);
  	if (p == NULL || err)
  		return 0;
  
  	/* skip leading spaces */
  	while (isspace((u_char)*cp))
  		cp++;
  
  	for (i = 0; i < 4; ++i) {
  		if (parse_fwd_field(&cp, &fwdargs[i]) != 0)
  			break;
  	}
  
  	/* Check for trailing garbage */
  	if (cp != NULL && *cp != '\0') {
  		i = 0;	/* failure */
  	}
  
  	switch (i) {
  	case 1:
  		if (fwdargs[0].ispath) {
  			fwd->listen_path = xstrdup(fwdargs[0].arg);
  			fwd->listen_port = PORT_STREAMLOCAL;
  		} else {
  			fwd->listen_host = NULL;
  			fwd->listen_port = a2port(fwdargs[0].arg);
  		}
  		fwd->connect_host = xstrdup("socks");
  		break;
  
  	case 2:
  		if (fwdargs[0].ispath && fwdargs[1].ispath) {
  			fwd->listen_path = xstrdup(fwdargs[0].arg);
  			fwd->listen_port = PORT_STREAMLOCAL;
  			fwd->connect_path = xstrdup(fwdargs[1].arg);
  			fwd->connect_port = PORT_STREAMLOCAL;
  		} else if (fwdargs[1].ispath) {
  			fwd->listen_host = NULL;
  			fwd->listen_port = a2port(fwdargs[0].arg);
  			fwd->connect_path = xstrdup(fwdargs[1].arg);
  			fwd->connect_port = PORT_STREAMLOCAL;
  		} else {
  			fwd->listen_host = xstrdup(fwdargs[0].arg);
  			fwd->listen_port = a2port(fwdargs[1].arg);
  			fwd->connect_host = xstrdup("socks");
  		}
  		break;
  
  	case 3:
  		if (fwdargs[0].ispath) {
  			fwd->listen_path = xstrdup(fwdargs[0].arg);
  			fwd->listen_port = PORT_STREAMLOCAL;
  			fwd->connect_host = xstrdup(fwdargs[1].arg);
  			fwd->connect_port = a2port(fwdargs[2].arg);
  		} else if (fwdargs[2].ispath) {
  			fwd->listen_host = xstrdup(fwdargs[0].arg);
  			fwd->listen_port = a2port(fwdargs[1].arg);
  			fwd->connect_path = xstrdup(fwdargs[2].arg);
  			fwd->connect_port = PORT_STREAMLOCAL;
  		} else {
  			fwd->listen_host = NULL;
  			fwd->listen_port = a2port(fwdargs[0].arg);
  			fwd->connect_host = xstrdup(fwdargs[1].arg);
  			fwd->connect_port = a2port(fwdargs[2].arg);
  		}
  		break;
  
  	case 4:
  		fwd->listen_host = xstrdup(fwdargs[0].arg);
  		fwd->listen_port = a2port(fwdargs[1].arg);
  		fwd->connect_host = xstrdup(fwdargs[2].arg);
  		fwd->connect_port = a2port(fwdargs[3].arg);
  		break;
  	default:
  		i = 0; /* failure */
  	}
  
  	free(p);
  
  	if (dynamicfwd) {
  		if (!(i == 1 || i == 2))
  			goto fail_free;
  	} else {
  		if (!(i == 3 || i == 4)) {
  			if (fwd->connect_path == NULL &&
  			    fwd->listen_path == NULL)
  				goto fail_free;
  		}
  		if (fwd->connect_port <= 0 && fwd->connect_path == NULL)
  			goto fail_free;
  	}
  
  	if ((fwd->listen_port < 0 && fwd->listen_path == NULL) ||
  	    (!remotefwd && fwd->listen_port == 0))
  		goto fail_free;
  	if (fwd->connect_host != NULL &&
  	    strlen(fwd->connect_host) >= NI_MAXHOST)
  		goto fail_free;
  	/*
  	 * XXX - if connecting to a remote socket, max sun len may not
  	 * match this host
  	 */
  	if (fwd->connect_path != NULL &&
  	    strlen(fwd->connect_path) >= PATH_MAX_SUN)
  		goto fail_free;
  	if (fwd->listen_host != NULL &&
  	    strlen(fwd->listen_host) >= NI_MAXHOST)
  		goto fail_free;
  	if (fwd->listen_path != NULL &&
  	    strlen(fwd->listen_path) >= PATH_MAX_SUN)
  		goto fail_free;
  
  	return (i);
  
   fail_free:
  	free(fwd->connect_host);
  	fwd->connect_host = NULL;
  	free(fwd->connect_path);
  	fwd->connect_path = NULL;
  	free(fwd->listen_host);
  	fwd->listen_host = NULL;
  	free(fwd->listen_path);
  	fwd->listen_path = NULL;
  	return (0);
  }
  
  int
  parse_jump(const char *s, Options *o, int active)
  {
  	char *orig, *sdup, *cp;
  	char *host = NULL, *user = NULL;
  	int r, ret = -1, port = -1, first;
  
  	active &= o->proxy_command == NULL && o->jump_host == NULL;
  
  	orig = sdup = xstrdup(s);
  
  	/* Remove comment and trailing whitespace */
  	if ((cp = strchr(orig, '#')) != NULL)
  		*cp = '\0';
  	rtrim(orig);
  
  	first = active;
  	do {
  		if (strcasecmp(s, "none") == 0)
  			break;
  		if ((cp = strrchr(sdup, ',')) == NULL)
  			cp = sdup; /* last */
  		else
  			*cp++ = '\0';
  
  		if (first) {
  			/* First argument and configuration is active */
  			r = parse_ssh_uri(cp, &user, &host, &port);
  			if (r == -1 || (r == 1 &&
  			    parse_user_host_port(cp, &user, &host, &port) != 0))
  				goto out;
  		} else {
  			/* Subsequent argument or inactive configuration */
  			r = parse_ssh_uri(cp, NULL, NULL, NULL);
  			if (r == -1 || (r == 1 &&
  			    parse_user_host_port(cp, NULL, NULL, NULL) != 0))
  				goto out;
  		}
  		first = 0; /* only check syntax for subsequent hosts */
  	} while (cp != sdup);
  	/* success */
  	if (active) {
  		if (strcasecmp(s, "none") == 0) {
  			o->jump_host = xstrdup("none");
  			o->jump_port = 0;
  		} else {
  			o->jump_user = user;
  			o->jump_host = host;
  			o->jump_port = port;
  			o->proxy_command = xstrdup("none");
  			user = host = NULL;
  			if ((cp = strrchr(s, ',')) != NULL && cp != s) {
  				o->jump_extra = xstrdup(s);
  				o->jump_extra[cp - s] = '\0';
  			}
  		}
  	}
  	ret = 0;
   out:
  	free(orig);
  	free(user);
  	free(host);
  	return ret;
  }
  
  int
  parse_ssh_uri(const char *uri, char **userp, char **hostp, int *portp)
  {
  	char *user = NULL, *host = NULL, *path = NULL;
  	int r, port;
  
  	r = parse_uri("ssh", uri, &user, &host, &port, &path);
  	if (r == 0 && path != NULL)
  		r = -1;		/* path not allowed */
  	if (r == 0) {
  		if (userp != NULL) {
  			*userp = user;
  			user = NULL;
  		}
  		if (hostp != NULL) {
  			*hostp = host;
  			host = NULL;
  		}
  		if (portp != NULL)
  			*portp = port;
  	}
  	free(user);
  	free(host);
  	free(path);
  	return r;
  }
  
  /* XXX the following is a near-verbatim copy from servconf.c; refactor */
  static const char *
  fmt_multistate_int(int val, const struct multistate *m)
  {
  	u_int i;
  
  	for (i = 0; m[i].key != NULL; i++) {
  		if (m[i].value == val)
  			return m[i].key;
  	}
  	return "UNKNOWN";
  }
  
  static const char *
  fmt_intarg(OpCodes code, int val)
  {
  	if (val == -1)
  		return "unset";
  	switch (code) {
  	case oAddressFamily:
  		return fmt_multistate_int(val, multistate_addressfamily);
  	case oVerifyHostKeyDNS:
  	case oUpdateHostkeys:
  		return fmt_multistate_int(val, multistate_yesnoask);
  	case oStrictHostKeyChecking:
  		return fmt_multistate_int(val, multistate_strict_hostkey);
  	case oControlMaster:
  		return fmt_multistate_int(val, multistate_controlmaster);
  	case oTunnel:
  		return fmt_multistate_int(val, multistate_tunnel);
  	case oRequestTTY:
  		return fmt_multistate_int(val, multistate_requesttty);
  	case oSessionType:
  		return fmt_multistate_int(val, multistate_sessiontype);
  	case oCanonicalizeHostname:
  		return fmt_multistate_int(val, multistate_canonicalizehostname);
  	case oAddKeysToAgent:
  		return fmt_multistate_int(val, multistate_yesnoaskconfirm);
  	case oPubkeyAuthentication:
  		return fmt_multistate_int(val, multistate_pubkey_auth);
  	case oFingerprintHash:
  		return ssh_digest_alg_name(val);
  	default:
  		switch (val) {
  		case 0:
  			return "no";
  		case 1:
  			return "yes";
  		default:
  			return "UNKNOWN";
  		}
  	}
  }
  
  static const char *
  lookup_opcode_name(OpCodes code)
  {
  	u_int i;
  
  	for (i = 0; keywords[i].name != NULL; i++)
  		if (keywords[i].opcode == code)
  			return(keywords[i].name);
  	return "UNKNOWN";
  }
  
  static void
  dump_cfg_int(OpCodes code, int val)
  {
  	if (code == oObscureKeystrokeTiming) {
  		if (val == 0) {
  			printf("%s no\n", lookup_opcode_name(code));
  			return;
  		} else if (val == SSH_KEYSTROKE_DEFAULT_INTERVAL_MS) {
  			printf("%s yes\n", lookup_opcode_name(code));
  			return;
  		}
  		/* FALLTHROUGH */
  	}
  	printf("%s %d\n", lookup_opcode_name(code), val);
  }
  
  static void
  dump_cfg_fmtint(OpCodes code, int val)
  {
  	printf("%s %s\n", lookup_opcode_name(code), fmt_intarg(code, val));
  }
  
  static void
  dump_cfg_string(OpCodes code, const char *val)
  {
  	if (val == NULL)
  		return;
  	printf("%s %s\n", lookup_opcode_name(code), val);
  }
  
  static void
  dump_cfg_strarray(OpCodes code, u_int count, char **vals)
  {
  	u_int i;
  
  	for (i = 0; i < count; i++)
  		printf("%s %s\n", lookup_opcode_name(code), vals[i]);
  }
  
  static void
  dump_cfg_strarray_oneline(OpCodes code, u_int count, char **vals)
  {
  	u_int i;
  
  	printf("%s", lookup_opcode_name(code));
  	if (count == 0)
  		printf(" none");
  	for (i = 0; i < count; i++)
  		printf(" %s",  vals[i]);
  	printf("\n");
  }
  
  static void
  dump_cfg_forwards(OpCodes code, u_int count, const struct Forward *fwds)
  {
  	const struct Forward *fwd;
  	u_int i;
  
  	/* oDynamicForward */
  	for (i = 0; i < count; i++) {
  		fwd = &fwds[i];
  		if (code == oDynamicForward && fwd->connect_host != NULL &&
  		    strcmp(fwd->connect_host, "socks") != 0)
  			continue;
  		if (code == oLocalForward && fwd->connect_host != NULL &&
  		    strcmp(fwd->connect_host, "socks") == 0)
  			continue;
  		printf("%s", lookup_opcode_name(code));
  		if (fwd->listen_port == PORT_STREAMLOCAL)
  			printf(" %s", fwd->listen_path);
  		else if (fwd->listen_host == NULL)
  			printf(" %d", fwd->listen_port);
  		else {
  			printf(" [%s]:%d",
  			    fwd->listen_host, fwd->listen_port);
  		}
  		if (code != oDynamicForward) {
  			if (fwd->connect_port == PORT_STREAMLOCAL)
  				printf(" %s", fwd->connect_path);
  			else if (fwd->connect_host == NULL)
  				printf(" %d", fwd->connect_port);
  			else {
  				printf(" [%s]:%d",
  				    fwd->connect_host, fwd->connect_port);
  			}
  		}
  		printf("\n");
  	}
  }
  
  void
  dump_client_config(Options *o, const char *host)
  {
  	int i, r;
  	char buf[8], *all_key;
  
  	/*
  	 * Expand HostKeyAlgorithms name lists. This isn't handled in
  	 * fill_default_options() like the other algorithm lists because
  	 * the host key algorithms are by default dynamically chosen based
  	 * on the host's keys found in known_hosts.
  	 */
  	all_key = sshkey_alg_list(0, 0, 1, ',');
  	if ((r = kex_assemble_names(&o->hostkeyalgorithms, kex_default_pk_alg(),
  	    all_key)) != 0)
  		fatal_fr(r, "expand HostKeyAlgorithms");
  	free(all_key);
  
  	/* Most interesting options first: user, host, port */
  	dump_cfg_string(oHost, o->host_arg);
  	dump_cfg_string(oUser, o->user);
  	dump_cfg_string(oHostname, host);
  	dump_cfg_int(oPort, o->port);
  
  	/* Flag options */
  	dump_cfg_fmtint(oAddressFamily, o->address_family);
  	dump_cfg_fmtint(oBatchMode, o->batch_mode);
  	dump_cfg_fmtint(oCanonicalizeFallbackLocal, o->canonicalize_fallback_local);
  	dump_cfg_fmtint(oCanonicalizeHostname, o->canonicalize_hostname);
  	dump_cfg_fmtint(oCheckHostIP, o->check_host_ip);
  	dump_cfg_fmtint(oCompression, o->compression);
  	dump_cfg_fmtint(oControlMaster, o->control_master);
  	dump_cfg_fmtint(oEnableSSHKeysign, o->enable_ssh_keysign);
  	dump_cfg_fmtint(oClearAllForwardings, o->clear_forwardings);
  	dump_cfg_fmtint(oExitOnForwardFailure, o->exit_on_forward_failure);
  	dump_cfg_fmtint(oFingerprintHash, o->fingerprint_hash);
  	dump_cfg_fmtint(oForwardX11, o->forward_x11);
  	dump_cfg_fmtint(oForwardX11Trusted, o->forward_x11_trusted);
  	dump_cfg_fmtint(oGatewayPorts, o->fwd_opts.gateway_ports);
  #ifdef GSSAPI
  	dump_cfg_fmtint(oGssAuthentication, o->gss_authentication);
  	dump_cfg_fmtint(oGssDelegateCreds, o->gss_deleg_creds);
  #endif /* GSSAPI */
  	dump_cfg_fmtint(oHashKnownHosts, o->hash_known_hosts);
  	dump_cfg_fmtint(oHostbasedAuthentication, o->hostbased_authentication);
  	dump_cfg_fmtint(oIdentitiesOnly, o->identities_only);
  	dump_cfg_fmtint(oKbdInteractiveAuthentication, o->kbd_interactive_authentication);
  	dump_cfg_fmtint(oNoHostAuthenticationForLocalhost, o->no_host_authentication_for_localhost);
  	dump_cfg_fmtint(oPasswordAuthentication, o->password_authentication);
  	dump_cfg_fmtint(oPermitLocalCommand, o->permit_local_command);
  	dump_cfg_fmtint(oProxyUseFdpass, o->proxy_use_fdpass);
  	dump_cfg_fmtint(oPubkeyAuthentication, o->pubkey_authentication);
  	dump_cfg_fmtint(oRequestTTY, o->request_tty);
  	dump_cfg_fmtint(oSessionType, o->session_type);
  	dump_cfg_fmtint(oStdinNull, o->stdin_null);
  	dump_cfg_fmtint(oForkAfterAuthentication, o->fork_after_authentication);
  	dump_cfg_fmtint(oStreamLocalBindUnlink, o->fwd_opts.streamlocal_bind_unlink);
  	dump_cfg_fmtint(oStrictHostKeyChecking, o->strict_host_key_checking);
  	dump_cfg_fmtint(oTCPKeepAlive, o->tcp_keep_alive);
  	dump_cfg_fmtint(oTunnel, o->tun_open);
  	dump_cfg_fmtint(oVerifyHostKeyDNS, o->verify_host_key_dns);
  	dump_cfg_fmtint(oVisualHostKey, o->visual_host_key);
  	dump_cfg_fmtint(oUpdateHostkeys, o->update_hostkeys);
  	dump_cfg_fmtint(oEnableEscapeCommandline, o->enable_escape_commandline);
  
  	/* Integer options */
  	dump_cfg_int(oCanonicalizeMaxDots, o->canonicalize_max_dots);
  	dump_cfg_int(oConnectionAttempts, o->connection_attempts);
  	dump_cfg_int(oForwardX11Timeout, o->forward_x11_timeout);
  	dump_cfg_int(oNumberOfPasswordPrompts, o->number_of_password_prompts);
  	dump_cfg_int(oServerAliveCountMax, o->server_alive_count_max);
  	dump_cfg_int(oServerAliveInterval, o->server_alive_interval);
  	dump_cfg_int(oRequiredRSASize, o->required_rsa_size);
  	dump_cfg_int(oObscureKeystrokeTiming,
  	    o->obscure_keystroke_timing_interval);
  
  	/* String options */
  	dump_cfg_string(oBindAddress, o->bind_address);
  	dump_cfg_string(oBindInterface, o->bind_interface);
  	dump_cfg_string(oCiphers, o->ciphers);
  	dump_cfg_string(oControlPath, o->control_path);
  	dump_cfg_string(oHostKeyAlgorithms, o->hostkeyalgorithms);
  	dump_cfg_string(oHostKeyAlias, o->host_key_alias);
  	dump_cfg_string(oHostbasedAcceptedAlgorithms, o->hostbased_accepted_algos);
  	dump_cfg_string(oIdentityAgent, o->identity_agent);
  	dump_cfg_string(oIgnoreUnknown, o->ignored_unknown);
  	dump_cfg_string(oKbdInteractiveDevices, o->kbd_interactive_devices);
  	dump_cfg_string(oKexAlgorithms, o->kex_algorithms);
  	dump_cfg_string(oCASignatureAlgorithms, o->ca_sign_algorithms);
  	dump_cfg_string(oLocalCommand, o->local_command);
  	dump_cfg_string(oRemoteCommand, o->remote_command);
  	dump_cfg_string(oLogLevel, log_level_name(o->log_level));
  	dump_cfg_string(oMacs, o->macs);
  #ifdef ENABLE_PKCS11
  	dump_cfg_string(oPKCS11Provider, o->pkcs11_provider);
  #endif
  	dump_cfg_string(oSecurityKeyProvider, o->sk_provider);
  	dump_cfg_string(oPreferredAuthentications, o->preferred_authentications);
  	dump_cfg_string(oPubkeyAcceptedAlgorithms, o->pubkey_accepted_algos);
  	dump_cfg_string(oRevokedHostKeys, o->revoked_host_keys);
  	dump_cfg_string(oXAuthLocation, o->xauth_location);
  	dump_cfg_string(oKnownHostsCommand, o->known_hosts_command);
  	dump_cfg_string(oTag, o->tag);
  
  	/* Forwards */
  	dump_cfg_forwards(oDynamicForward, o->num_local_forwards, o->local_forwards);
  	dump_cfg_forwards(oLocalForward, o->num_local_forwards, o->local_forwards);
  	dump_cfg_forwards(oRemoteForward, o->num_remote_forwards, o->remote_forwards);
  
  	/* String array options */
  	dump_cfg_strarray(oIdentityFile, o->num_identity_files, o->identity_files);
  	dump_cfg_strarray_oneline(oCanonicalDomains, o->num_canonical_domains, o->canonical_domains);
  	dump_cfg_strarray(oCertificateFile, o->num_certificate_files, o->certificate_files);
  	dump_cfg_strarray_oneline(oGlobalKnownHostsFile, o->num_system_hostfiles, o->system_hostfiles);
  	dump_cfg_strarray_oneline(oUserKnownHostsFile, o->num_user_hostfiles, o->user_hostfiles);
  	dump_cfg_strarray(oSendEnv, o->num_send_env, o->send_env);
  	dump_cfg_strarray(oSetEnv, o->num_setenv, o->setenv);
  	dump_cfg_strarray_oneline(oLogVerbose,
  	    o->num_log_verbose, o->log_verbose);
  	dump_cfg_strarray_oneline(oChannelTimeout,
  	    o->num_channel_timeouts, o->channel_timeouts);
  
  	/* Special cases */
  
  	/* PermitRemoteOpen */
  	if (o->num_permitted_remote_opens == 0)
  		printf("%s any\n", lookup_opcode_name(oPermitRemoteOpen));
  	else
  		dump_cfg_strarray_oneline(oPermitRemoteOpen,
  		    o->num_permitted_remote_opens, o->permitted_remote_opens);
  
  	/* AddKeysToAgent */
  	if (o->add_keys_to_agent_lifespan <= 0)
  		dump_cfg_fmtint(oAddKeysToAgent, o->add_keys_to_agent);
  	else {
  		printf("addkeystoagent%s %d\n",
  		    o->add_keys_to_agent == 3 ? " confirm" : "",
  		    o->add_keys_to_agent_lifespan);
  	}
  
  	/* oForwardAgent */
  	if (o->forward_agent_sock_path == NULL)
  		dump_cfg_fmtint(oForwardAgent, o->forward_agent);
  	else
  		dump_cfg_string(oForwardAgent, o->forward_agent_sock_path);
  
  	/* oConnectTimeout */
  	if (o->connection_timeout == -1)
  		printf("connecttimeout none\n");
  	else
  		dump_cfg_int(oConnectTimeout, o->connection_timeout);
  
  	/* oTunnelDevice */
  	printf("tunneldevice");
  	if (o->tun_local == SSH_TUNID_ANY)
  		printf(" any");
  	else
  		printf(" %d", o->tun_local);
  	if (o->tun_remote == SSH_TUNID_ANY)
  		printf(":any");
  	else
  		printf(":%d", o->tun_remote);
  	printf("\n");
  
  	/* oCanonicalizePermittedCNAMEs */
  	printf("canonicalizePermittedcnames");
  	if (o->num_permitted_cnames == 0)
  		printf(" none");
  	for (i = 0; i < o->num_permitted_cnames; i++) {
  		printf(" %s:%s", o->permitted_cnames[i].source_list,
  		    o->permitted_cnames[i].target_list);
  	}
  	printf("\n");
  
  	/* oControlPersist */
  	if (o->control_persist == 0 || o->control_persist_timeout == 0)
  		dump_cfg_fmtint(oControlPersist, o->control_persist);
  	else
  		dump_cfg_int(oControlPersist, o->control_persist_timeout);
  
  	/* oEscapeChar */
  	if (o->escape_char == SSH_ESCAPECHAR_NONE)
  		printf("escapechar none\n");
  	else {
  		vis(buf, o->escape_char, VIS_WHITE, 0);
  		printf("escapechar %s\n", buf);
  	}
  
  	/* oIPQoS */
  	printf("ipqos %s ", iptos2str(o->ip_qos_interactive));
  	printf("%s\n", iptos2str(o->ip_qos_bulk));
  
  	/* oRekeyLimit */
  	printf("rekeylimit %llu %d\n",
  	    (unsigned long long)o->rekey_limit, o->rekey_interval);
  
  	/* oStreamLocalBindMask */
  	printf("streamlocalbindmask 0%o\n",
  	    o->fwd_opts.streamlocal_bind_mask);
  
  	/* oLogFacility */
  	printf("syslogfacility %s\n", log_facility_name(o->log_facility));
  
  	/* oProxyCommand / oProxyJump */
  	if (o->jump_host == NULL)
  		dump_cfg_string(oProxyCommand, o->proxy_command);
  	else {
  		/* Check for numeric addresses */
  		i = strchr(o->jump_host, ':') != NULL ||
  		    strspn(o->jump_host, "1234567890.") == strlen(o->jump_host);
  		snprintf(buf, sizeof(buf), "%d", o->jump_port);
  		printf("proxyjump %s%s%s%s%s%s%s%s%s\n",
  		    /* optional additional jump spec */
  		    o->jump_extra == NULL ? "" : o->jump_extra,
  		    o->jump_extra == NULL ? "" : ",",
  		    /* optional user */
  		    o->jump_user == NULL ? "" : o->jump_user,
  		    o->jump_user == NULL ? "" : "@",
  		    /* opening [ if hostname is numeric */
  		    i ? "[" : "",
  		    /* mandatory hostname */
  		    o->jump_host,
  		    /* closing ] if hostname is numeric */
  		    i ? "]" : "",
  		    /* optional port number */
  		    o->jump_port <= 0 ? "" : ":",
  		    o->jump_port <= 0 ? "" : buf);
  	}
  }