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;
}
