Changeset b097945 for lib/misc.c

Timestamp:

2017-04-06T20:25:08Z (8 years ago)

Author:

Wilmer van der Gaast <github@…>

Branches:

master

Children:

0515063

Parents:

0156c42

git-author:

Wilmer van der Gaast <wilmer@…> (05-04-17 22:38:08)

git-committer:

Wilmer van der Gaast <github@…> (06-04-17 20:25:08)

Message:

Move canohost functions (diff licence) to separate file.

File:

• lib/misc.c (modified) (2 diffs)

lib/misc.c

@@ -1 @@
-/********************************************************************\
+  /********************************************************************\
   * BitlBee -- An IRC to other IM-networks gateway                     *
   *                                                                    *
@@ -504 +504 @@
 }
 
-/* From OpenSSH 7.4p1 canohost.c" */
-char *reverse_lookup(const struct sockaddr *from_, const socklen_t fromlen_)
-{
-        struct sockaddr_storage from;
-        socklen_t fromlen;
-        struct addrinfo hints, *ai, *aitop;
-        char name[NI_MAXHOST], ntop2[NI_MAXHOST];
-        char ntop[INET6_ADDRSTRLEN];
-
-        fromlen = sizeof(from);
-        memset(&from, 0, sizeof(from));
-        memcpy(&from, from_, fromlen_);
-        ipv64_normalise_mapped(&from, &fromlen);
-        if (from.ss_family == AF_INET6) {
-                fromlen = sizeof(struct sockaddr_in6);
-        }
-
-        if (getnameinfo((struct sockaddr *)&from, fromlen, ntop, sizeof(ntop),
-            NULL, 0, NI_NUMERICHOST) != 0) {
-                return NULL;
-        }
-
-        /* Map the IP address to a host name. */
-        if (getnameinfo((struct sockaddr *)&from, fromlen, name, sizeof(name),
-            NULL, 0, NI_NAMEREQD) != 0) {
-                /* Host name not found.  Use ip address. */
-                return g_strdup(ntop);
-        }
-
-        /*
-         * if reverse lookup result looks like a numeric hostname,
-         * someone is trying to trick us by PTR record like following:
-         *      1.1.1.10.in-addr.arpa.  IN PTR  2.3.4.5
-         */
-        memset(&hints, 0, sizeof(hints));
-        hints.ai_socktype = SOCK_DGRAM; /*dummy*/
-        hints.ai_flags = AI_NUMERICHOST;
-        if (getaddrinfo(name, NULL, &hints, &ai) == 0) {
-                freeaddrinfo(ai);
-                return g_strdup(ntop);
-        }
-
-        /* Names are stored in lowercase. */
-        char *tolower = g_utf8_strdown(name, -1);
-        g_snprintf(name, sizeof(name), "%s", tolower);
-        g_free(tolower);
-
-        /*
-         * Map it back to an IP address and check that the given
-         * address actually is an address of this host.  This is
-         * necessary because anyone with access to a name server can
-         * define arbitrary names for an IP address. Mapping from
-         * name to IP address can be trusted better (but can still be
-         * fooled if the intruder has access to the name server of
-         * the domain).
-         */
-        memset(&hints, 0, sizeof(hints));
-        hints.ai_family = from.ss_family;
-        hints.ai_socktype = SOCK_STREAM;
-        if (getaddrinfo(name, NULL, &hints, &aitop) != 0) {
-                return g_strdup(ntop);
-        }
-        /* Look for the address from the list of addresses. */
-        for (ai = aitop; ai; ai = ai->ai_next) {
-                if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop2,
-                    sizeof(ntop2), NULL, 0, NI_NUMERICHOST) == 0 &&
-                    (strcmp(ntop, ntop2) == 0))
-                        break;
-        }
-        freeaddrinfo(aitop);
-        /* If we reached the end of the list, the address was not there. */
-        if (ai == NULL) {
-                /* Address not found for the host name. */
-                return g_strdup(ntop);
-        }
-        return g_strdup(name);
-}
-
-void
-ipv64_normalise_mapped(struct sockaddr_storage *addr, socklen_t *len)
-{
-        struct sockaddr_in6 *a6 = (struct sockaddr_in6 *)addr;
-        struct sockaddr_in *a4 = (struct sockaddr_in *)addr;
-        struct in_addr inaddr;
-        u_int16_t port;
-
-        if (addr->ss_family != AF_INET6 ||
-            !IN6_IS_ADDR_V4MAPPED(&a6->sin6_addr))
-                return;
-
-        memcpy(&inaddr, ((char *)&a6->sin6_addr) + 12, sizeof(inaddr));
-        port = a6->sin6_port;
-
-        memset(a4, 0, sizeof(*a4));
-
-        a4->sin_family = AF_INET;
-        *len = sizeof(*a4);
-        memcpy(&a4->sin_addr, &inaddr, sizeof(inaddr));
-        a4->sin_port = port;
-}
-
 char *word_wrap(const char *msg, int line_len)
 {