/* vi: set sw=4 ts=4: */ /* * stolen from net-tools-1.59 and stripped down for busybox by * Erik Andersen * * Heavily modified by Manuel Novoa III Mar 12, 2001 * * Version: $Id: inet_common.c,v 1.8 2004/03/10 07:42:38 mjn3 Exp $ * */ #include "libbb.h" #include "inet_common.h" #include #include #include #include #include #ifdef DEBUG # include #endif const char bb_INET_default[] = "default"; int INET_resolve(const char *name, struct sockaddr_in *s_in, int hostfirst) { struct hostent *hp; struct netent *np; /* Grmpf. -FvK */ s_in->sin_family = AF_INET; s_in->sin_port = 0; /* Default is special, meaning 0.0.0.0. */ if (!strcmp(name, bb_INET_default)) { s_in->sin_addr.s_addr = INADDR_ANY; return (1); } /* Look to see if it's a dotted quad. */ if (inet_aton(name, &s_in->sin_addr)) { return 0; } /* If we expect this to be a hostname, try hostname database first */ #ifdef DEBUG if (hostfirst) { bb_error_msg("gethostbyname (%s)", name); } #endif if (hostfirst && (hp = gethostbyname(name)) != (struct hostent *) NULL) { memcpy((char *) &s_in->sin_addr, (char *) hp->h_addr_list[0], sizeof(struct in_addr)); return 0; } /* Try the NETWORKS database to see if this is a known network. */ #ifdef DEBUG bb_error_msg("getnetbyname (%s)", name); #endif if ((np = getnetbyname(name)) != (struct netent *) NULL) { s_in->sin_addr.s_addr = htonl(np->n_net); return 1; } if (hostfirst) { /* Don't try again */ return -1; } #ifdef DEBUG res_init(); _res.options |= RES_DEBUG; #endif #ifdef DEBUG bb_error_msg("gethostbyname (%s)", name); #endif if ((hp = gethostbyname(name)) == (struct hostent *) NULL) { return -1; } memcpy((char *) &s_in->sin_addr, (char *) hp->h_addr_list[0], sizeof(struct in_addr)); return 0; } /* cache */ struct addr { struct sockaddr_in addr; char *name; int host; struct addr *next; }; static struct addr *INET_nn = NULL; /* addr-to-name cache */ /* numeric: & 0x8000: default instead of *, * & 0x4000: host instead of net, * & 0x0fff: don't resolve */ int INET_rresolve(char *name, size_t len, struct sockaddr_in *s_in, int numeric, unsigned int netmask) { struct hostent *ent; struct netent *np; struct addr *pn; unsigned long ad, host_ad; int host = 0; /* Grmpf. -FvK */ if (s_in->sin_family != AF_INET) { #ifdef DEBUG bb_error_msg("rresolve: unsupport address family %d !", s_in->sin_family); #endif errno = EAFNOSUPPORT; return (-1); } ad = (unsigned long) s_in->sin_addr.s_addr; #ifdef DEBUG bb_error_msg("rresolve: %08lx, mask %08x, num %08x", ad, netmask, numeric); #endif if (ad == INADDR_ANY) { if ((numeric & 0x0FFF) == 0) { if (numeric & 0x8000) safe_strncpy(name, bb_INET_default, len); else safe_strncpy(name, "*", len); return (0); } } if (numeric & 0x0FFF) { safe_strncpy(name, inet_ntoa(s_in->sin_addr), len); return (0); } if ((ad & (~netmask)) != 0 || (numeric & 0x4000)) host = 1; pn = INET_nn; while (pn != NULL) { if (pn->addr.sin_addr.s_addr == ad && pn->host == host) { safe_strncpy(name, pn->name, len); #ifdef DEBUG bb_error_msg("rresolve: found %s %08lx in cache", (host ? "host" : "net"), ad); #endif return (0); } pn = pn->next; } host_ad = ntohl(ad); np = NULL; ent = NULL; if (host) { #ifdef DEBUG bb_error_msg("gethostbyaddr (%08lx)", ad); #endif ent = gethostbyaddr((char *) &ad, 4, AF_INET); if (ent != NULL) { safe_strncpy(name, ent->h_name, len); } } else { #ifdef DEBUG bb_error_msg("getnetbyaddr (%08lx)", host_ad); #endif np = getnetbyaddr(host_ad, AF_INET); if (np != NULL) { safe_strncpy(name, np->n_name, len); } } if ((ent == NULL) && (np == NULL)) { safe_strncpy(name, inet_ntoa(s_in->sin_addr), len); } pn = (struct addr *) xmalloc(sizeof(struct addr)); pn->addr = *s_in; pn->next = INET_nn; pn->host = host; pn->name = bb_xstrdup(name); INET_nn = pn; return (0); } #ifdef CONFIG_FEATURE_IPV6 int INET6_resolve(const char *name, struct sockaddr_in6 *sin6) { struct addrinfo req, *ai; int s; memset(&req, '\0', sizeof req); req.ai_family = AF_INET6; if ((s = getaddrinfo(name, NULL, &req, &ai))) { bb_error_msg("getaddrinfo: %s: %d", name, s); return -1; } memcpy(sin6, ai->ai_addr, sizeof(struct sockaddr_in6)); freeaddrinfo(ai); return (0); } #ifndef IN6_IS_ADDR_UNSPECIFIED # define IN6_IS_ADDR_UNSPECIFIED(a) \ (((uint32_t *) (a))[0] == 0 && ((uint32_t *) (a))[1] == 0 && \ ((uint32_t *) (a))[2] == 0 && ((uint32_t *) (a))[3] == 0) #endif int INET6_rresolve(char *name, size_t len, struct sockaddr_in6 *sin6, int numeric) { int s; /* Grmpf. -FvK */ if (sin6->sin6_family != AF_INET6) { #ifdef DEBUG bb_error_msg(_("rresolve: unsupport address family %d !\n"), sin6->sin6_family); #endif errno = EAFNOSUPPORT; return (-1); } if (numeric & 0x7FFF) { inet_ntop(AF_INET6, &sin6->sin6_addr, name, len); return (0); } if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { if (numeric & 0x8000) { strcpy(name, "default"); } else { strcpy(name, "*"); } return (0); } s = getnameinfo((struct sockaddr *) sin6, sizeof(struct sockaddr_in6), name, len, NULL, 0, 0); if (s) { bb_error_msg("getnameinfo failed"); return -1; } return (0); } #endif /* CONFIG_FEATURE_IPV6 */