331 lines
6.9 KiB
C
331 lines
6.9 KiB
C
/* XChat Win32 DNS Plugin
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* Copyright (C) 2003-2004 Peter Zelezny.
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* Copyright (C) 2012 Berke Viktor.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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/*
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* Requires MS Visual Studio and IPV6 headers to compile (run nmake).
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* Compiling with gcc (mingw) will fail due to missing gai_strerror.
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*/
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#define DNS_VERSION "2.4"
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#define USE_IPV6
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#ifdef WIN32
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#ifdef USE_IPV6
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#include <winsock2.h>
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#include <ws2tcpip.h>
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#else
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#include <winsock2.h>
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#endif
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#else
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#include <unistd.h>
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#include <netdb.h>
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#include <sys/socket.h>
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#endif
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#include "xchat-plugin.h"
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#include "thread.h"
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#define HELP "Usage: DNS <nickname|hostname|numerical address>\n"
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#define HEAD "\0034[DNS]\017\t"
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#define PIPE_READ 0
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#define PIPE_WRITE 1
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#define MAX_HOSTNAME 128
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static xchat_plugin *ph;
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static thread *active_thread = NULL;
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static int
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waitline (void *source, char *buf, int bufsize)
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{
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int i = 0;
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int len;
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while(1)
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{
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len = 1;
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/* we can't read() here, due to glib's giowin32 */
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if (ph->xchat_read_fd (ph, source, buf + i, &len) != 0)
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{
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return -1;
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}
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if (buf[i] == '\n' || bufsize == i + 1)
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{
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buf[i] = 0;
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return i;
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}
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i++;
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}
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}
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static void *
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thread_function (void *ud)
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{
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#ifdef USE_IPV6
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struct addrinfo *ent;
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struct addrinfo *cur;
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struct addrinfo hints;
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#else
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struct hostent *ent;
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#endif
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thread *th = ud;
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int fd = th->pipe_fd[PIPE_WRITE];
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int ret;
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char ipstring[MAX_HOSTNAME];
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char reverse[MAX_HOSTNAME];
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// int i;
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active_thread = th;
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#ifdef USE_IPV6
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memset (&hints, 0, sizeof (hints));
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hints.ai_family = PF_UNSPEC; /* support ipv6 and ipv4 */
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hints.ai_flags = AI_CANONNAME;
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// hints.ai_socktype = SOCK_STREAM;
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ret = getaddrinfo (th->userdata, NULL, &hints, &ent);
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if (ret != 0)
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{
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sprintf (ipstring, "1%d\n", ret); /* failed */
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write (fd, ipstring, strlen (ipstring));
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// Sleep (3000);
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active_thread = NULL;
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return 0;
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}
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// i = 0;
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cur = ent;
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while (cur)
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{
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/* find the numeric IP number */
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ipstring[0] = 0;
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getnameinfo (cur->ai_addr, cur->ai_addrlen,
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ipstring, sizeof (ipstring), NULL, 0, NI_NUMERICHOST);
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if (cur->ai_canonname)
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{
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/* force reverse lookup if canonname & ipstring are the same */
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if (/*i == 0 &&*/ strcmp (cur->ai_canonname, ipstring) == 0)
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goto lamecode;
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}
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if (cur->ai_canonname)
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{
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write (fd, "0", 1);
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write (fd, ipstring, strlen (ipstring));
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write (fd, "\n", 1);
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write (fd, cur->ai_canonname, strlen (cur->ai_canonname));
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} else
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{
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lamecode:
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// ret = 1;
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// if (i == 0)
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{
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/* reverse lookup */
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reverse[0] = 0;
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ret = getnameinfo (cur->ai_addr, cur->ai_addrlen,
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reverse, sizeof (reverse), NULL, 0, NI_NAMEREQD);
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}
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write (fd, "0", 1);
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write (fd, ipstring, strlen (ipstring));
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write (fd, "\n", 1);
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if (ret == 0)
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write (fd, reverse, strlen (reverse));
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}
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write (fd, "\n", 1);
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// i++;
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cur = cur->ai_next;
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}
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/* tell the parent we're done */
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write (fd, "2\n", 2);
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freeaddrinfo (ent);
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#else
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ent = gethostbyname (th->userdata);
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if (ent)
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{
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write (fd, "0", 1);
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write (fd, ent->h_name, strlen (ent->h_name));
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write (fd, "\n", 1);
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write (fd, ent->h_name, strlen (ent->h_name));
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write (fd, "\n", 1);
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write (fd, "2\n", 2);
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} else
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{
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write (fd, "10\n", 1);
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}
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#endif
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// Sleep (3000);
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active_thread = NULL; /* race condition, better than nothing */
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return 0;
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}
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static int
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dns_close_pipe (int fd)
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{
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close (fd);
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return 0;
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}
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/* read messages comming from the child (through the pipe) */
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static int
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dns_read_cb (int fd, int flags, thread *th, void *source)
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{
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char buf[512];
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char buf2[512];
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while (waitline (source, buf, sizeof (buf)))
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{
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switch (buf[0])
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{
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case '0': /* got data to show */
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waitline (source, buf2, sizeof (buf2));
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if (buf2[0] == 0)
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xchat_printf(ph, HEAD"\002Numerical\002: %s\n", buf + 1);
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else
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xchat_printf(ph, HEAD"\002Canonical\002: %s \002Numerical\002: %s\n", buf2, buf + 1);
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return 1;
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case '1': /* failed */
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xchat_printf(ph, HEAD"Lookup failed. %s\n", gai_strerrorA (atoi (buf + 1)));
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case '2': /* done */
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// close (th->pipe_fd[PIPE_WRITE]);
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// close (th->pipe_fd[PIPE_READ]);
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xchat_hook_timer(ph, 3000, dns_close_pipe, (void *)th->pipe_fd[PIPE_WRITE]);
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xchat_hook_timer(ph, 4000, dns_close_pipe, (void *)th->pipe_fd[PIPE_READ]);
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free (th->userdata); /* hostname strdup'ed */
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free (th);
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return 0;
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}
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}
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return 1;
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}
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/* find hostname from nickname (search the userlist, current chan only) */
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static char *
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find_nick_host (char *nick)
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{
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xchat_list *list;
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char *at;
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const char *host;
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list = xchat_list_get (ph, "users");
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if (!list)
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return NULL;
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while (xchat_list_next (ph, list))
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{
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if (stricmp (nick, xchat_list_str (ph, list, "nick")) == 0)
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{
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host = xchat_list_str (ph, list, "host");
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if (host)
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{
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at = strrchr (host, '@');
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if (at)
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return at + 1;
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}
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break;
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}
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}
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return NULL;
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}
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static int
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dns_cmd_cb (char *word[], char *word_eol[], void *ud)
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{
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thread *th;
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char *nickhost;
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if (!word[2][0])
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{
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xchat_print (ph, HELP);
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return XCHAT_EAT_ALL;
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}
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th = thread_new ();
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if (th)
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{
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nickhost = find_nick_host (word[2]);
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if (nickhost)
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{
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xchat_printf (ph, HEAD"Looking up %s (%s)...\n", nickhost, word[2]);
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th->userdata = strdup (nickhost);
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} else
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{
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xchat_printf (ph, HEAD"Looking up %s...\n", word[2]);
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th->userdata = strdup (word[2]);
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}
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if (thread_start (th, thread_function, th))
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{
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xchat_hook_fd(ph, th->pipe_fd[PIPE_READ],
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XCHAT_FD_READ | XCHAT_FD_EXCEPTION | XCHAT_FD_NOTSOCKET,
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(void *)dns_read_cb, th);
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}
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}
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return XCHAT_EAT_ALL;
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}
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int
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xchat_plugin_deinit (xchat_plugin *plugin_handle)
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{
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while (active_thread) /* children will set this var to NULL soon... */
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{
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Sleep (1000);
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}
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xchat_printf (ph, "DNS plugin unloaded\n");
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return 1;
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}
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int
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xchat_plugin_init
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(xchat_plugin *plugin_handle, char **plugin_name,
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char **plugin_desc, char **plugin_version, char *arg)
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{
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/* we need to save this for use with any xchat_* functions */
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ph = plugin_handle;
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*plugin_name = "DNS";
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*plugin_desc = "Threaded IPv4/6 DNS Command";
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*plugin_version = DNS_VERSION;
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xchat_hook_command(ph, "DNS", XCHAT_PRI_LOW, dns_cmd_cb, HELP, 0);
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xchat_printf (ph, "DNS plugin loaded\n");
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return 1; /* return 1 for success */
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}
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