thodg/got/libexec/got-read-gitconfig/got-read-gitconfig.c

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  Commit

• Author : Stefan Sperling
  Date : 2020-03-22 17:20:18
  Hash : e70bf110
  Message : move functions from privsep.c to the helpers which use them where possible

• libexec/got-read-gitconfig/got-read-gitconfig.c

• /*
   * Copyright (c) 2019 Stefan Sperling <stsp@openbsd.org>
   *
   * Permission to use, copy, modify, and distribute this software for any
   * purpose with or without fee is hereby granted, provided that the above
   * copyright notice and this permission notice appear in all copies.
   *
   * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
   * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   */
  
  #include <sys/types.h>
  #include <sys/queue.h>
  #include <sys/uio.h>
  #include <sys/time.h>
  #include <sys/syslimits.h>
  
  #include <stdint.h>
  #include <imsg.h>
  #include <limits.h>
  #include <signal.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <sha1.h>
  #include <zlib.h>
  
  #include "got_error.h"
  #include "got_object.h"
  #include "got_repository.h"
  
  #include "got_lib_delta.h"
  #include "got_lib_object.h"
  #include "got_lib_privsep.h"
  #include "got_lib_gitconfig.h"
  
  static volatile sig_atomic_t sigint_received;
  
  static void
  catch_sigint(int signo)
  {
  	sigint_received = 1;
  }
  
  static const struct got_error *
  send_gitconfig_int(struct imsgbuf *ibuf, int value)
  {
  	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_INT_VAL, 0, 0, -1,
  	    &value, sizeof(value)) == -1)
  		return got_error_from_errno("imsg_compose GITCONFIG_INT_VAL");
  
  	return got_privsep_flush_imsg(ibuf);
  }
  
  static const struct got_error *
  gitconfig_num_request(struct imsgbuf *ibuf, struct got_gitconfig *gitconfig,
      char *section, char *tag, int def)
  {
  	int value;
  
  	if (gitconfig == NULL)
  		return got_error(GOT_ERR_PRIVSEP_MSG);
  
  	value = got_gitconfig_get_num(gitconfig, section, tag, def);
  	return send_gitconfig_int(ibuf, value);
  }
  
  static const struct got_error *
  send_gitconfig_str(struct imsgbuf *ibuf, const char *value)
  {
  	size_t len = value ? strlen(value) + 1 : 0;
  
  	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_STR_VAL, 0, 0, -1,
  	    value, len) == -1)
  		return got_error_from_errno("imsg_compose GITCONFIG_STR_VAL");
  
  	return got_privsep_flush_imsg(ibuf);
  }
  
  static const struct got_error *
  gitconfig_str_request(struct imsgbuf *ibuf, struct got_gitconfig *gitconfig,
      char *section, char *tag)
  {
  	char *value;
  
  	if (gitconfig == NULL)
  		return got_error(GOT_ERR_PRIVSEP_MSG);
  
  	value = got_gitconfig_get_str(gitconfig, section, tag);
  	return send_gitconfig_str(ibuf, value);
  }
  
  static const struct got_error *
  send_gitconfig_remotes(struct imsgbuf *ibuf, struct got_remote_repo *remotes,
      int nremotes)
  {
  	const struct got_error *err = NULL;
  	struct got_imsg_remotes iremotes;
  	int i;
  
  	iremotes.nremotes = nremotes;
  	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_REMOTES, 0, 0, -1,
  	    &iremotes, sizeof(iremotes)) == -1)
  		return got_error_from_errno("imsg_compose GITCONFIG_REMOTES");
  
  	err = got_privsep_flush_imsg(ibuf);
  	imsg_clear(ibuf);
  	if (err)
  		return err;
  
  	for (i = 0; i < nremotes; i++) {
  		struct got_imsg_remote iremote;
  		size_t len = sizeof(iremote);
  		struct ibuf *wbuf;
  
  		iremote.mirror_references = remotes[i].mirror_references;
  		iremote.name_len = strlen(remotes[i].name);
  		len += iremote.name_len;
  		iremote.url_len = strlen(remotes[i].url);
  		len += iremote.url_len;
  
  		wbuf = imsg_create(ibuf, GOT_IMSG_GITCONFIG_REMOTE, 0, 0, len);
  		if (wbuf == NULL)
  			return got_error_from_errno(
  			    "imsg_create GITCONFIG_REMOTE");
  
  		if (imsg_add(wbuf, &iremote, sizeof(iremote)) == -1) {
  			err = got_error_from_errno(
  			    "imsg_add GITCONFIG_REMOTE");
  			ibuf_free(wbuf);
  			return err;
  		}
  
  		if (imsg_add(wbuf, remotes[i].name, iremote.name_len) == -1) {
  			err = got_error_from_errno(
  			    "imsg_add GITCONFIG_REMOTE");
  			ibuf_free(wbuf);
  			return err;
  		}
  		if (imsg_add(wbuf, remotes[i].url, iremote.url_len) == -1) {
  			err = got_error_from_errno(
  			    "imsg_add GITCONFIG_REMOTE");
  			ibuf_free(wbuf);
  			return err;
  		}
  
  		wbuf->fd = -1;
  		imsg_close(ibuf, wbuf);
  		err = got_privsep_flush_imsg(ibuf);
  		if (err)
  			return err;
  	}
  
  	return NULL;
  }
  
  
  static const struct got_error *
  gitconfig_remotes_request(struct imsgbuf *ibuf, struct got_gitconfig *gitconfig)
  {
  	const struct got_error *err = NULL;
  	struct got_gitconfig_list *sections;
  	struct got_gitconfig_list_node *node;
  	struct got_remote_repo *remotes = NULL;
  	int nremotes = 0, i;
  
  	if (gitconfig == NULL)
  		return got_error(GOT_ERR_PRIVSEP_MSG);
  
  	err = got_gitconfig_get_section_list(&sections, gitconfig);
  	if (err)
  		return err;
  
  	TAILQ_FOREACH(node, &sections->fields, link) {
  		if (strncasecmp("remote \"", node->field, 8) != 0)
  			continue;
  		nremotes++;
  	}
  
  	if (nremotes == 0) {
  		err = send_gitconfig_remotes(ibuf, NULL, 0);
  		goto done;
  	}
  
  	remotes = recallocarray(NULL, 0, nremotes, sizeof(*remotes));
  	if (remotes == NULL) {
  		err = got_error_from_errno("recallocarray");
  		goto done;
  	}
  
  	i = 0;
  	TAILQ_FOREACH(node, &sections->fields, link) {
  		char *name, *end, *mirror;
  
  		if (strncasecmp("remote \"", node->field, 8) != 0)
  			continue;
  
  		name = strdup(node->field + 8);
  		if (name == NULL) {
  			err = got_error_from_errno("strdup");
  			goto done;
  		}
  		end = strrchr(name, '"');
  		if (end)
  			*end = '\0';
  		remotes[i].name = name;
  
  		remotes[i].url = got_gitconfig_get_str(gitconfig,
  		    node->field, "url");
  		if (remotes[i].url == NULL) {
  			err = got_error(GOT_ERR_GITCONFIG_SYNTAX);
  			goto done;
  		}
  
  		remotes[i].mirror_references = 0;
  		mirror = got_gitconfig_get_str(gitconfig, node->field,
  		    "mirror");
  		if (mirror != NULL &&
  		    (strcasecmp(mirror, "true") == 0 ||
  		    strcasecmp(mirror, "on") == 0 ||
  		    strcasecmp(mirror, "yes") == 0 ||
  		    strcmp(mirror, "1") == 0))
  			remotes[i].mirror_references = 1;
  
  		i++;
  	}
  
  	err = send_gitconfig_remotes(ibuf, remotes, nremotes);
  done:
  	for (i = 0; i < nremotes; i++)
  		free(remotes[i].name);
  	free(remotes);
  	got_gitconfig_free_list(sections);
  	return err;
  }
  
  static const struct got_error *
  gitconfig_owner_request(struct imsgbuf *ibuf, struct got_gitconfig *gitconfig)
  {
  	char *value;
  
  	if (gitconfig == NULL)
  		return got_error(GOT_ERR_PRIVSEP_MSG);
  
  	value = got_gitconfig_get_str(gitconfig, "gotweb", "owner");
  	if (value)
  		return send_gitconfig_str(ibuf, value);
  	value = got_gitconfig_get_str(gitconfig, "gitweb", "owner");
  	return send_gitconfig_str(ibuf, value);
  }
  
  int
  main(int argc, char *argv[])
  {
  	const struct got_error *err = NULL;
  	struct imsgbuf ibuf;
  	size_t datalen;
  	struct got_gitconfig *gitconfig = NULL;
  #if 0
  	static int attached;
  
  	while (!attached)
  		sleep(1);
  #endif
  	signal(SIGINT, catch_sigint);
  
  	imsg_init(&ibuf, GOT_IMSG_FD_CHILD);
  
  #ifndef PROFILE
  	/* revoke access to most system calls */
  	if (pledge("stdio recvfd", NULL) == -1) {
  		err = got_error_from_errno("pledge");
  		got_privsep_send_error(&ibuf, err);
  		return 1;
  	}
  #endif
  
  	for (;;) {
  		struct imsg imsg;
  
  		memset(&imsg, 0, sizeof(imsg));
  		imsg.fd = -1;
  
  		if (sigint_received) {
  			err = got_error(GOT_ERR_CANCELLED);
  			break;
  		}
  
  		err = got_privsep_recv_imsg(&imsg, &ibuf, 0);
  		if (err) {
  			if (err->code == GOT_ERR_PRIVSEP_PIPE)
  				err = NULL;
  			break;
  		}
  
  		if (imsg.hdr.type == GOT_IMSG_STOP)
  			break;
  
  		switch (imsg.hdr.type) {
  		case GOT_IMSG_GITCONFIG_PARSE_REQUEST:
  			datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
  			if (datalen != 0) {
  				err = got_error(GOT_ERR_PRIVSEP_LEN);
  				break;
  			}
  			if (imsg.fd == -1){
  				err = got_error(GOT_ERR_PRIVSEP_NO_FD);
  				break;
  			}
  
  			if (gitconfig)
  				got_gitconfig_close(gitconfig);
  			err = got_gitconfig_open(&gitconfig, imsg.fd);
  			break;
  		case GOT_IMSG_GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST:
  			err = gitconfig_num_request(&ibuf, gitconfig, "core",
  			    "repositoryformatversion", 0);
  			break;
  		case GOT_IMSG_GITCONFIG_AUTHOR_NAME_REQUEST:
  			err = gitconfig_str_request(&ibuf, gitconfig, "user",
  			    "name");
  			break;
  		case GOT_IMSG_GITCONFIG_AUTHOR_EMAIL_REQUEST:
  			err = gitconfig_str_request(&ibuf, gitconfig, "user",
  			    "email");
  			break;
  		case GOT_IMSG_GITCONFIG_REMOTES_REQUEST:
  			err = gitconfig_remotes_request(&ibuf, gitconfig);
  			break;
  		case GOT_IMSG_GITCONFIG_OWNER_REQUEST:
  			err = gitconfig_owner_request(&ibuf, gitconfig);
  			break;
  		default:
  			err = got_error(GOT_ERR_PRIVSEP_MSG);
  			break;
  		}
  
  		if (imsg.fd != -1) {
  			if (close(imsg.fd) == -1 && err == NULL)
  				err = got_error_from_errno("close");
  		}
  
  		imsg_free(&imsg);
  		if (err)
  			break;
  	}
  
  	imsg_clear(&ibuf);
  	if (err) {
  		if (!sigint_received && err->code != GOT_ERR_PRIVSEP_PIPE) {
  			fprintf(stderr, "%s: %s\n", getprogname(), err->msg);
  			got_privsep_send_error(&ibuf, err);
  		}
  	}
  	if (close(GOT_IMSG_FD_CHILD) != 0 && err == NULL)
  		err = got_error_from_errno("close");
  	return err ? 1 : 0;
  }