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IABSD.fr/src/lib/libpcap/nametoaddr.c
deraadt
- lib/libpcap/nametoaddr.c
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/* $OpenBSD: nametoaddr.c,v 1.25 2024/04/05 18:01:56 deraadt Exp $ */ /* * Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that: (1) source code distributions * retain the above copyright notice and this paragraph in its entirety, (2) * distributions including binary code include the above copyright notice and * this paragraph in its entirety in the documentation or other materials * provided with the distribution, and (3) all advertising materials mentioning * features or use of this software display the following acknowledgement: * ``This product includes software developed by the University of California, * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of * the University nor the names of its contributors may be used to endorse * or promote products derived from this software without specific prior * written permission. * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. * * Name to id translation routines used by the scanner. * These functions are not time critical. */ #include <sys/types.h> /* concession to AIX */ #include <sys/socket.h> #include <sys/time.h> #include <net/if.h> #include <netinet/in.h> #include <netinet/if_ether.h> #include <arpa/inet.h> #include <ctype.h> #include <errno.h> #include <stdlib.h> #include <netdb.h> #include <stdio.h> #include <string.h> #include "pcap-int.h" #include "gencode.h" #include <pcap-namedb.h> #ifdef HAVE_OS_PROTO_H #include "os-proto.h" #endif #ifndef NTOHL #define NTOHL(x) (x) = ntohl(x) #define NTOHS(x) (x) = ntohs(x) #endif static __inline int xdtoi(int); /* * Convert host name to internet address. * Return 0 upon failure. */ bpf_u_int32 ** pcap_nametoaddr(const char *name) { #ifndef h_addr static bpf_u_int32 *hlist[2]; #endif bpf_u_int32 **p; struct hostent *hp; if ((hp = gethostbyname(name)) != NULL) { #ifndef h_addr hlist[0] = (bpf_u_int32 *)hp->h_addr; NTOHL(hp->h_addr); return hlist; #else for (p = (bpf_u_int32 **)hp->h_addr_list; *p; ++p) NTOHL(**p); return (bpf_u_int32 **)hp->h_addr_list; #endif } else return 0; } #ifdef INET6 struct addrinfo * pcap_nametoaddrinfo(const char *name) { struct addrinfo hints, *res; int error; memset(&hints, 0, sizeof(hints)); hints.ai_family = PF_UNSPEC; hints.ai_socktype = SOCK_STREAM; /*not really*/ error = getaddrinfo(name, NULL, &hints, &res); if (error) return NULL; else return res; } #endif /*INET6*/ /* * Convert net name to internet address. * Return 0 upon failure. */ bpf_u_int32 pcap_nametonetaddr(const char *name) { struct netent *np; if ((np = getnetbyname(name)) != NULL) return np->n_net; else return 0; } /* * Convert a port name to its port and protocol numbers. * We assume only TCP or UDP. * Return 0 upon failure. */ int pcap_nametoport(const char *name, int *port, int *proto) { struct servent *sp; char *other; sp = getservbyname(name, (char *)0); if (sp != NULL) { NTOHS(sp->s_port); *port = sp->s_port; *proto = pcap_nametoproto(sp->s_proto); /* * We need to check /etc/services for ambiguous entries. * If we find the ambiguous entry, and it has the * same port number, change the proto to PROTO_UNDEF * so both TCP and UDP will be checked. */ if (*proto == IPPROTO_TCP) other = "udp"; else other = "tcp"; sp = getservbyname(name, other); if (sp != 0) { NTOHS(sp->s_port); #ifdef notdef if (*port != sp->s_port) /* Can't handle ambiguous names that refer to different port numbers. */ warning("ambiguous port %s in /etc/services", name); #endif *proto = PROTO_UNDEF; } return 1; } #if defined(ultrix) || defined(__osf__) /* Special hack in case NFS isn't in /etc/services */ if (strcmp(name, "nfs") == 0) { *port = 2049; *proto = PROTO_UNDEF; return 1; } #endif return 0; } int pcap_nametoproto(const char *str) { struct protoent *p; p = getprotobyname(str); if (p != 0) return p->p_proto; else return PROTO_UNDEF; } #include "ethertype.h" struct eproto { char *s; u_short p; }; /* Static data base of ether protocol types. */ static const struct eproto _eproto_db[] = { { "pup", ETHERTYPE_PUP }, { "xns", ETHERTYPE_NS }, { "ip", ETHERTYPE_IP }, #ifdef INET6 { "ip6", ETHERTYPE_IPV6 }, #endif { "arp", ETHERTYPE_ARP }, { "rarp", ETHERTYPE_REVARP }, { "lldp", ETHERTYPE_LLDP }, { "slow", ETHERTYPE_SLOW }, { "sprite", ETHERTYPE_SPRITE }, { "mopdl", ETHERTYPE_MOPDL }, { "moprc", ETHERTYPE_MOPRC }, { "decnet", ETHERTYPE_DN }, { "lat", ETHERTYPE_LAT }, { "sca", ETHERTYPE_SCA }, { "lanbridge", ETHERTYPE_LANBRIDGE }, { "vexp", ETHERTYPE_VEXP }, { "vprod", ETHERTYPE_VPROD }, { "atalk", ETHERTYPE_ATALK }, { "atalkarp", ETHERTYPE_AARP }, { "loopback", ETHERTYPE_LOOPBACK }, { "decdts", ETHERTYPE_DECDTS }, { "decdns", ETHERTYPE_DECDNS }, { (char *)0, 0 } }; /* Accessor for tcpdump */ const struct eproto * const eproto_db = _eproto_db; int pcap_nametoeproto(const char *s) { const struct eproto *p = _eproto_db; while (p->s != 0) { if (strcmp(p->s, s) == 0) return p->p; p += 1; } return PROTO_UNDEF; } #include "llc.h" /* Static data base of LLC values. */ static const struct eproto llc_db[] = { { "stp", LLCSAP_8021D }, { (char *)0, 0 } }; int pcap_nametollc(const char *s) { const struct eproto *p = llc_db; while (p->s != 0) { if (strcmp(p->s, s) == 0) return p->p; p += 1; } return PROTO_UNDEF; } /* Hex digit to integer. */ static __inline int xdtoi(int c) { if (isdigit(c)) return c - '0'; else if (islower(c)) return c - 'a' + 10; else return c - 'A' + 10; } int __pcap_atoin(const char *s, bpf_u_int32 *addr) { u_int n; int len; *addr = 0; len = 0; while (1) { n = 0; while (*s && *s != '.') n = n * 10 + *s++ - '0'; *addr <<= 8; *addr |= n & 0xff; len += 8; if (*s == '\0') return len; ++s; } /* NOTREACHED */ } int __pcap_atodn(const char *s, bpf_u_int32 *addr) { #define AREASHIFT 10 #define AREAMASK 0176000 #define NODEMASK 01777 u_int node, area; if (sscanf((char *)s, "%d.%d", &area, &node) != 2) bpf_error("malformed decnet address '%s'", s); *addr = (area << AREASHIFT) & AREAMASK; *addr |= (node & NODEMASK); return(32); } /* * Convert 's' which has the form "xx:xx:xx:xx:xx:xx" into a new * ethernet address. Assumes 's' is well formed. */ u_char * pcap_ether_aton(const char *s) { u_char *ep, *e; u_int d; e = ep = malloc(6); if (e == NULL) bpf_error("malloc"); while (*s) { if (*s == ':') s += 1; d = xdtoi(*s++); if (isxdigit((unsigned char)*s)) { d <<= 4; d |= xdtoi(*s++); } *ep++ = d; } return (e); } #ifndef HAVE_ETHER_HOSTTON /* Roll our own */ u_char * pcap_ether_hostton(const char *name) { struct pcap_etherent *ep; u_char *ap; static FILE *fp = NULL; static init = 0; if (!init) { fp = fopen(PCAP_ETHERS_FILE, "r"); ++init; if (fp == NULL) return (NULL); } else if (fp == NULL) return (NULL); else rewind(fp); while ((ep = pcap_next_etherent(fp)) != NULL) { if (strcmp(ep->name, name) == 0) { ap = malloc(6); if (ap != NULL) { memcpy(ap, ep->addr, 6); return (ap); } break; } } return (NULL); } #else /* Use the os supplied routines */ u_char * pcap_ether_hostton(const char *name) { u_char *ap; u_char a[6]; ap = NULL; if (ether_hostton(name, (struct ether_addr *)a) == 0) { ap = malloc(6); if (ap != NULL) memcpy((char *)ap, (char *)a, 6); } return (ap); } #endif u_short __pcap_nametodnaddr(const char *name) { #ifdef DECNETLIB struct nodeent *getnodebyname(); struct nodeent *nep; unsigned short res; nep = getnodebyname(name); if (nep == ((struct nodeent *)0)) bpf_error("unknown decnet host name '%s'\n", name); memcpy((char *)&res, (char *)nep->n_addr, sizeof(unsigned short)); return(res); #else bpf_error("decnet name support not included, '%s' cannot be translated\n", name); /* NOTREACHED */ #endif }