pr_netaddr_t *pr_netaddr_get_addr(pool *p, const char *name, array_header **addrs) { struct sockaddr_in v4; pr_netaddr_t *na = NULL; int res; if (p == NULL || name == NULL) { errno = EINVAL; return NULL; } pr_trace_msg(trace_channel, 10, "resolving name '%s' to IP address", name); /* Attempt to translate the given name into a pr_netaddr_t using * pr_inet_pton() first. * * First, if IPv6 support is enabled, we try to translate the name using * pr_inet_pton(AF_INET6) on the hopes that the given string is a valid * representation of an IPv6 address. If that fails, or if IPv6 support * is not enabled, we try with pr_inet_pton(AF_INET). If that fails, we * assume that the given name is a DNS name, and we call pr_getaddrinfo(). */ na = (pr_netaddr_t *) pcalloc(p, sizeof(pr_netaddr_t)); #ifdef PR_USE_IPV6 if (use_ipv6) { struct sockaddr_in6 v6; memset(&v6, 0, sizeof(v6)); v6.sin6_family = AF_INET6; # ifdef SIN6_LEN v6.sin6_len = sizeof(struct sockaddr_in6); # endif /* SIN6_LEN */ res = pr_inet_pton(AF_INET6, name, &v6.sin6_addr); if (res > 0) { pr_netaddr_set_family(na, AF_INET6); pr_netaddr_set_sockaddr(na, (struct sockaddr *) &v6); if (addrs) *addrs = NULL; pr_trace_msg(trace_channel, 7, "'%s' resolved to IPv6 address %s", name, pr_netaddr_get_ipstr(na)); return na; } } #endif /* PR_USE_IPV6 */ memset(&v4, 0, sizeof(v4)); v4.sin_family = AF_INET; # ifdef SIN_LEN v4.sin_len = sizeof(struct sockaddr_in); # endif /* SIN_LEN */ res = pr_inet_pton(AF_INET, name, &v4.sin_addr); if (res > 0) { pr_netaddr_set_family(na, AF_INET); pr_netaddr_set_sockaddr(na, (struct sockaddr *) &v4); if (addrs) *addrs = NULL; pr_trace_msg(trace_channel, 7, "'%s' resolved to IPv4 address %s", name, pr_netaddr_get_ipstr(na)); return na; } else if (res == 0) { /* If pr_inet_pton() returns 0, it means that name does not represent a * valid network address in the specified address family. Usually, * this means that name is actually a DNS name, not an IP address * string. So we treat it as a DNS name, and use getaddrinfo(3) to * resolve that name to its IP address(es). */ struct addrinfo hints, *info = NULL; int gai_res = 0; memset(&hints, 0, sizeof(hints)); hints.ai_family = AF_INET; hints.ai_socktype = SOCK_STREAM; pr_trace_msg(trace_channel, 7, "attempting to resolve '%s' to IPv4 address via DNS", name); gai_res = pr_getaddrinfo(name, NULL, &hints, &info); if (gai_res != 0) { if (gai_res != EAI_SYSTEM) { pr_trace_msg(trace_channel, 1, "IPv4 getaddrinfo '%s' error: %s", name, pr_gai_strerror(gai_res)); } else { pr_trace_msg(trace_channel, 1, "IPv4 getaddrinfo '%s' system error: [%d] %s", name, errno, strerror(errno)); } return NULL; } if (info) { /* Copy the first returned addr into na, as the return value. */ pr_netaddr_set_family(na, info->ai_family); pr_netaddr_set_sockaddr(na, info->ai_addr); pr_trace_msg(trace_channel, 7, "resolved '%s' to %s address %s", name, info->ai_family == AF_INET ? "IPv4" : "IPv6", pr_netaddr_get_ipstr(na)); pr_freeaddrinfo(info); } #ifdef PR_USE_IPV6 if (use_ipv6 && addrs) { /* Do the call again, this time for IPv6 addresses. * * We make two separate getaddrinfo(3) calls, rather than one * with a hint of AF_UNSPEC, because of certain bugs where the use * of AF_UNSPEC does not function as advertised. (I suspect this * bug was caused by proftpd's calling pattern, but as I could * not track it down, and as there are reports of AF_UNSPEC not * being as fast as AF_INET/AF_INET6, it just seemed easier to * do it this way.) */ gai_res = 0; memset(&hints, 0, sizeof(hints)); hints.ai_family = AF_INET6; hints.ai_socktype = SOCK_STREAM; pr_trace_msg(trace_channel, 7, "attempting to resolve '%s' to IPv6 address via DNS", name); gai_res = pr_getaddrinfo(name, NULL, &hints, &info); if (gai_res != 0) { if (gai_res != EAI_SYSTEM) { pr_trace_msg(trace_channel, 1, "IPv6 getaddrinfo '%s' error: %s", name, pr_gai_strerror(gai_res)); } else { pr_trace_msg(trace_channel, 1, "IPv6 getaddrinfo '%s' system error: [%d] %s", name, errno, strerror(errno)); } return na; } if (info) { pr_netaddr_t **elt; *addrs = make_array(p, 0, sizeof(pr_netaddr_t *)); elt = push_array(*addrs); *elt = pcalloc(p, sizeof(pr_netaddr_t)); pr_netaddr_set_family(*elt, info->ai_family); pr_netaddr_set_sockaddr(*elt, info->ai_addr); pr_trace_msg(trace_channel, 7, "resolved '%s' to %s address %s", name, info->ai_family == AF_INET ? "IPv4" : "IPv6", pr_netaddr_get_ipstr(*elt)); pr_freeaddrinfo(info); } } #endif /* PR_USE_IPV6 */ return na; } pr_trace_msg(trace_channel, 8, "failed to resolve '%s' to an IP address", name); return NULL; }
pr_netaddr_t *pr_netaddr_get_addr(pool *p, const char *name, array_header **addrs) { struct sockaddr_in v4; #ifdef PR_USE_IPV6 struct sockaddr_in6 v6; #endif /* PR_USE_IPV6 */ pr_netaddr_t *na = NULL; int res; if (p == NULL || name == NULL) { errno = EINVAL; return NULL; } /* Attempt to translate the given name into a pr_netaddr_t using * pr_inet_pton() first. * * First, if IPv6 support is enabled, we try to translate the name using * pr_inet_pton(AF_INET6) on the hopes that the given string is a valid * representation of an IPv6 address. If that fails, or if IPv6 support * is not enabled, we try with pr_inet_pton(AF_INET). If that fails, we * assume that the given name is a DNS name, and we call pr_getaddrinfo(). */ na = (pr_netaddr_t *) pcalloc(p, sizeof(pr_netaddr_t)); #ifdef PR_USE_IPV6 memset(&v6, 0, sizeof(v6)); v6.sin6_family = AF_INET6; # ifdef SIN6_LEN v6.sin6_len = sizeof(struct sockaddr_in6); # endif /* SIN6_LEN */ res = pr_inet_pton(AF_INET6, name, &v6.sin6_addr); if (res > 0) { pr_netaddr_set_family(na, AF_INET6); pr_netaddr_set_sockaddr(na, (struct sockaddr *) &v6); if (addrs) *addrs = NULL; pr_log_debug(DEBUG10, "'%s' resolved to an IPv6 address", name); return na; } #endif memset(&v4, 0, sizeof(v4)); v4.sin_family = AF_INET; # ifdef SIN_LEN v4.sin_len = sizeof(struct sockaddr_in); # endif /* SIN_LEN */ res = pr_inet_pton(AF_INET, name, &v4.sin_addr); if (res > 0) { pr_netaddr_set_family(na, AF_INET); pr_netaddr_set_sockaddr(na, (struct sockaddr *) &v4); if (addrs) *addrs = NULL; pr_log_debug(DEBUG10, "'%s' resolved to an IPv4 address", name); return na; } else if (res == 0) { /* If pr_inet_pton() returns 0, it means that name does not represent a * valid network address in the specified address family. Usually, * this means that name is actually a DNS name, not an IP address * string. So we treat it as a DNS name, and use getaddrinfo(3) to * resolve that name to its IP address(es). */ struct addrinfo hints, *info = NULL; int gai_res = 0; memset(&hints, 0, sizeof(hints)); #ifdef PR_USE_IPV6 /* This looks up both IPv4 (as IPv6-mapped) and IPv6 addresses. */ hints.ai_family = AF_UNSPEC; #else hints.ai_family = AF_INET; #endif /* PR_USE_IPV6 */ hints.ai_socktype = SOCK_STREAM; pr_log_debug(DEBUG10, "attempting to resolve '%s' via DNS", name); gai_res = pr_getaddrinfo(name, NULL, &hints, &info); if (gai_res != 0) { pr_log_pri(PR_LOG_INFO, "getaddrinfo '%s' error: %s", name, res != EAI_SYSTEM ? pr_gai_strerror(gai_res) : strerror(errno)); return NULL; } if (info) { pr_log_debug(DEBUG10, "resolved '%s' to an %s address", name, info->ai_family == AF_INET ? "IPv4" : "IPv6"); /* Copy the first returned addr into na, as the return value. */ pr_netaddr_set_family(na, info->ai_family); pr_netaddr_set_sockaddr(na, info->ai_addr); /* If the caller provided a pointer for any additional addresses, * then we cycle through the rest of getaddrinfo(3)'s results and * build a list to return to the caller. */ if (addrs) { struct addrinfo *ai; *addrs = make_array(p, 0, sizeof(pr_netaddr_t *)); for (ai = info->ai_next; ai; ai = ai->ai_next) { pr_netaddr_t **elt = push_array(*addrs); *elt = pcalloc(p, sizeof(pr_netaddr_t)); pr_netaddr_set_family(*elt, ai->ai_family); pr_netaddr_set_sockaddr(*elt, ai->ai_addr); } } pr_freeaddrinfo(info); return na; } } pr_log_debug(DEBUG10, "failed to resolve '%s' to an IP address", name); return NULL; }