2 * IRC - Internet Relay Chat, ircd/s_auth.c
3 * Copyright (C) 1992 Darren Reed
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 1, or (at your option)
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 #include <sys/socket.h>
26 #include <sys/ioctl.h>
35 #include <arpa/inet.h>
53 #include "sprintf_irc.h"
60 * Flag the client to show that an attempt to contact the ident server on
61 * the client's host. The connect and subsequently the socket are all put
62 * into 'non-blocking' mode. Should the connect or any later phase of the
63 * identifing process fail, it is aborted and the user is given a username
66 void start_auth(aClient *cptr)
68 struct sockaddr_in sock;
71 Debug((DEBUG_NOTICE, "start_auth(%p) fd %d status %d",
72 cptr, cptr->fd, cptr->status));
75 cptr->authfd = socket(AF_INET, SOCK_STREAM, 0);
78 if (cptr->authfd < 0 && err == EAGAIN)
79 sendto_ops("Can't allocate fd for auth on %s : socket: No more sockets",
80 get_client_name(cptr, TRUE));
85 syslog(LOG_ERR, "Unable to create auth socket for %s:%m",
86 get_client_name(cptr, TRUE));
88 Debug((DEBUG_ERROR, "Unable to create auth socket for %s:%s",
89 get_client_name(cptr, TRUE), strerror(get_sockerr(cptr))));
95 if (cptr->authfd >= (MAXCONNECTIONS - 2))
97 sendto_ops("Can't allocate fd for auth on %s", get_client_name(cptr, TRUE));
102 set_non_blocking(cptr->authfd, cptr);
105 if (bind(cptr->authfd, (struct sockaddr *)&vserv, sizeof(vserv)) == -1)
107 report_error("binding auth stream socket %s: %s", cptr);
112 memcpy(&sock.sin_addr, &cptr->ip, sizeof(struct in_addr));
114 sock.sin_port = htons(113);
115 sock.sin_family = AF_INET;
118 if (connect(cptr->authfd, (struct sockaddr *)&sock,
119 sizeof(sock)) == -1 && errno != EINPROGRESS)
123 * No error report from this...
133 cptr->flags |= (FLAGS_WRAUTH | FLAGS_AUTH);
134 if (cptr->authfd > highest_fd)
135 highest_fd = cptr->authfd;
142 * Send the ident server a query giving "theirport , ourport".
143 * The write is only attempted *once* so it is deemed to be a fail if the
144 * entire write doesn't write all the data given. This shouldnt be a
145 * problem since the socket should have a write buffer far greater than
146 * this message to store it in should problems arise. -avalon
148 void send_authports(aClient *cptr)
150 struct sockaddr_in us, them;
154 Debug((DEBUG_NOTICE, "write_authports(%p) fd %d authfd %d stat %d",
155 cptr, cptr->fd, cptr->authfd, cptr->status));
156 tlen = ulen = sizeof(us);
157 if (getsockname(cptr->fd, (struct sockaddr *)&us, &ulen) ||
158 getpeername(cptr->fd, (struct sockaddr *)&them, &tlen))
161 syslog(LOG_ERR, "auth get{sock,peer}name error for %s:%m",
162 get_client_name(cptr, TRUE));
167 sprintf_irc(authbuf, "%u , %u\r\n", (unsigned int)ntohs(them.sin_port),
168 (unsigned int)ntohs(us.sin_port));
170 Debug((DEBUG_SEND, "sending [%s] to auth port %s.113",
171 authbuf, inetntoa(them.sin_addr)));
172 if (write(cptr->authfd, authbuf, strlen(authbuf)) != (int)strlen(authbuf))
177 if (cptr->authfd == highest_fd)
178 while (!loc_clients[highest_fd])
181 cptr->flags &= ~FLAGS_AUTH;
185 cptr->flags &= ~FLAGS_WRAUTH;
192 * read the reply (if any) from the ident server we connected to.
193 * The actual read processijng here is pretty weak - no handling of the reply
194 * if it is fragmented by IP.
196 void read_authports(aClient *cptr)
200 char ruser[USERLEN + 1], system[8];
201 unsigned short int remp = 0, locp = 0;
203 *system = *ruser = '\0';
204 Debug((DEBUG_NOTICE, "read_authports(%p) fd %d authfd %d stat %d",
205 cptr, cptr->fd, cptr->authfd, cptr->status));
207 * Nasty. Cant allow any other reads from client fd while we're
208 * waiting on the authfd to return a full valid string. Use the
209 * client's input buffer to buffer the authd reply.
210 * Oh. this is needed because an authd reply may come back in more
211 * than 1 read! -avalon
213 if ((len = read(cptr->authfd, cptr->buffer + cptr->count,
214 sizeof(cptr->buffer) - 1 - cptr->count)) >= 0)
217 cptr->buffer[cptr->count] = '\0';
220 cptr->lasttime = now;
221 if ((len > 0) && (cptr->count != (sizeof(cptr->buffer) - 1)) &&
222 (sscanf(cptr->buffer, "%hd , %hd : USERID : %*[^:]: %10s",
223 &remp, &locp, ruser) == 3))
225 s = strrchr(cptr->buffer, ':');
227 for (t = (strrchr(cptr->buffer, ':') + 1); *t; t++)
230 strncpy(system, t, sizeof(system) - 1);
231 system[sizeof(system) - 1] = 0;
232 for (t = ruser; *s && (t < ruser + sizeof(ruser)); s++)
233 if (!isSpace(*s) && *s != ':' && *s != '@')
236 Debug((DEBUG_INFO, "auth reply ok [%s] [%s]", system, ruser));
240 if (!strchr(cptr->buffer, '\n') && !strchr(cptr->buffer, '\r'))
242 Debug((DEBUG_ERROR, "local %d remote %d", locp, remp));
243 Debug((DEBUG_ERROR, "bad auth reply in [%s]", cptr->buffer));
247 if (cptr->authfd == highest_fd)
248 while (!loc_clients[highest_fd])
256 Debug((DEBUG_INFO, "ident reply: [%s]", cptr->buffer));
258 if (!locp || !remp || !*ruser)
264 strncpy(cptr->username, ruser, USERLEN);
265 cptr->username[USERLEN] = 0; /* This is the LA bug --Run */
266 if (strncmp(system, "OTHER", 5))
267 cptr->flags |= FLAGS_GOTID;
268 Debug((DEBUG_INFO, "got username [%s]", ruser));