Changeset df67b48

Timestamp:

2017-04-03T20:55:50Z (8 years ago)

Author:

Wilmer van der Gaast <wilmer@…>

Children:

b1b9453

Parents:

c39cd8e

Message:

Add PROXY command. Not actually an IRC protocol command, it's a HAProxy
trick supported by stunnel to indicate where the connection originally
came from. Looks a little better on public servers.

Files:

• irc.c (modified) (5 diffs)
• irc.h (modified) (2 diffs)
• irc_commands.c (modified) (2 diffs)

irc.c

@@ -41 +41 @@
 {
         irc_t *irc;
-        struct sockaddr_storage sock;
-        socklen_t socklen = sizeof(sock);
-        char *host = NULL, *myhost = NULL;
         irc_user_t *iu;
         GSList *l;
@@ -64 +61 @@
         irc->iconv = (GIConv) - 1;
         irc->oconv = (GIConv) - 1;
-
-        if (global.conf->hostname) {
-                myhost = g_strdup(global.conf->hostname);
-        } else if (getsockname(irc->fd, (struct sockaddr*) &sock, &socklen) == 0) {
-                myhost = reverse_lookup((struct sockaddr*) &sock, socklen);
-        }
-
-        if (getpeername(irc->fd, (struct sockaddr*) &sock, &socklen) == 0) {
-                host = reverse_lookup((struct sockaddr*) &sock, socklen);
-        }
-
-        if (host == NULL) {
-                host = g_strdup("localhost.localdomain");
-        }
-        if (myhost == NULL) {
-                myhost = g_strdup("localhost.localdomain");
-        }
 
         if (global.conf->ping_interval > 0 && global.conf->ping_timeout > 0) {
@@ -128 +108 @@
 
         irc->root = iu = irc_user_new(irc, ROOT_NICK);
-        iu->host = g_strdup(myhost);
         iu->fullname = g_strdup(ROOT_FN);
         iu->f = &irc_user_root_funcs;
 
         iu = irc_user_new(irc, NS_NICK);
-        iu->host = g_strdup(myhost);
         iu->fullname = g_strdup(ROOT_FN);
         iu->f = &irc_user_root_funcs;
 
         irc->user = g_new0(irc_user_t, 1);
-        irc->user->host = g_strdup(host);
+        
+        irc_set_hosts(irc, NULL, 0);
 
         conf_loaddefaults(irc);
@@ -154 +133 @@
         }
 
-        g_free(myhost);
-        g_free(host);
-
         /* libpurple doesn't like fork()s after initializing itself, so this
            is the right moment to initialize it. */
@@ -176 +152 @@
 
         return irc;
+}
+
+void irc_set_hosts(irc_t *irc, const struct sockaddr *remote_addr, const socklen_t remote_addrlen)
+{
+        struct sockaddr_storage sock;
+        socklen_t socklen = sizeof(sock);
+        char *host = NULL, *myhost = NULL;
+        struct irc_user *iu;
+
+        if (global.conf->hostname) {
+                myhost = g_strdup(global.conf->hostname);
+        } else if (getsockname(irc->fd, (struct sockaddr*) &sock, &socklen) == 0) {
+                myhost = reverse_lookup((struct sockaddr*) &sock, socklen);
+        }
+
+        if (remote_addrlen > 0) {
+                host = reverse_lookup(remote_addr, remote_addrlen);
+        } else if (getpeername(irc->fd, (struct sockaddr*) &sock, &socklen) == 0) {
+                host = reverse_lookup((struct sockaddr*) &sock, socklen);
+        }
+
+        if (myhost == NULL) {
+                myhost = g_strdup("localhost.localdomain");
+        }
+        if (host == NULL) {
+                host = g_strdup("localhost.localdomain");
+        }
+        
+        if (irc->root->host != irc->root->nick) {
+                g_free(irc->root->host);
+        }
+        irc->root->host = g_strdup(myhost);
+        if ((iu = irc_user_by_name(irc, NS_NICK))) {
+                if (iu->host != iu->nick) {
+                        g_free(iu->host);
+                }
+                iu->host = g_strdup(myhost);
+        }
+        
+        if (irc->user->host != irc->user->nick) {
+                g_free(irc->user->host);
+        }
+        irc->user->host = g_strdup(host);
+
+        g_free(myhost);
+        g_free(host);
 }
 

irc.h

@@ -26 +26 @@
 #ifndef _IRC_H
 #define _IRC_H
+
+#include <sys/socket.h>
 
 #define IRC_MAX_LINE 512
@@ -271 +273 @@
 
 irc_t *irc_new(int fd);
+void irc_set_hosts(irc_t *irc, const struct sockaddr *remote_addr, const socklen_t remote_addrlen);
 void irc_abort(irc_t *irc, int immed, char *format, ...) G_GNUC_PRINTF(3, 4);
 void irc_free(irc_t *irc);

irc_commands.c

@@ -57 +57 @@
                 irc_check_login(irc);
         }
+}
+
+/* http://www.haproxy.org/download/1.8/doc/proxy-protocol.txt
+
+   This isn't actually IRC, it's used by for example stunnel4 to indicate
+   the origin of the secured counterpart of the connection. It'll go wrong
+   with arguments starting with : like for example "::1" but I guess I'm
+   okay with that. */
+static void irc_cmd_proxy(irc_t *irc, char **cmd)
+{
+        struct addrinfo hints, *ai;
+        struct sockaddr_storage sock;
+        socklen_t socklen = sizeof(sock);
+
+        if (getpeername(irc->fd, (struct sockaddr*) &sock, &socklen) != 0) {
+                return;
+        }
+
+        ipv64_normalise_mapped(&sock, &socklen);
+
+        /* Only accept PROXY "command" on localhost sockets. */
+        if (!((sock.ss_family == AF_INET &&
+               ntohl(((struct sockaddr_in*)&sock)->sin_addr.s_addr) == INADDR_LOOPBACK) ||
+              (sock.ss_family == AF_INET6 &&
+               IN6_IS_ADDR_LOOPBACK(&((struct sockaddr_in6*)&sock)->sin6_addr)))) {
+                return;
+        }
+
+        /* And only once. Do this with a pretty dumb regex-match for
+           now, maybe better to use some sort of flag.. */
+        if (!g_regex_match_simple("^(ip6-)?localhost(.(localdomain.?)?)?$", irc->user->host, 0, 0)) {
+                return;
+        }
+        
+        memset(&hints, 0, sizeof(hints));
+        hints.ai_flags = AI_NUMERICHOST;
+        if (getaddrinfo(cmd[2], NULL, &hints, &ai) != 0) {
+                return;
+        }
+        
+        irc_set_hosts(irc, ai->ai_addr, ai->ai_addrlen);
+        freeaddrinfo(ai);
 }
 
@@ -808 +850 @@
         { "cap",         1, irc_cmd_cap,         0 },
         { "pass",        1, irc_cmd_pass,        0 },
+        { "proxy",       5, irc_cmd_proxy,       IRC_CMD_PRE_LOGIN },
         { "user",        4, irc_cmd_user,        IRC_CMD_PRE_LOGIN },
         { "nick",        1, irc_cmd_nick,        0 },