| /* vi: set sw=4 ts=4: */ |
| /* |
| * stolen from net-tools-1.59 and stripped down for busybox by |
| * Erik Andersen <andersen@codepoet.org> |
| * |
| * 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 <stdio.h> |
| #include <errno.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <unistd.h> |
| |
| #ifdef DEBUG |
| # include <resolv.h> |
| #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 */ |