1 |
/* |
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* ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd). |
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* s_bsd.c: Network functions. |
4 |
* |
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* Copyright (C) 2002 by the past and present ircd coders, and others. |
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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 |
10 |
* (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 |
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* USA |
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* |
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* $Id$ |
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*/ |
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|
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#include "stdinc.h" |
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#ifndef _WIN32 |
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#include <netinet/in_systm.h> |
28 |
#include <netinet/ip.h> |
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#include <netinet/tcp.h> |
30 |
#endif |
31 |
#include "fdlist.h" |
32 |
#include "s_bsd.h" |
33 |
#include "client.h" |
34 |
#include "common.h" |
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#include "dbuf.h" |
36 |
#include "event.h" |
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#include "irc_string.h" |
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#include "irc_getnameinfo.h" |
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#include "irc_getaddrinfo.h" |
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#include "ircd.h" |
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#include "list.h" |
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#include "listener.h" |
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#include "numeric.h" |
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#include "packet.h" |
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#include "irc_res.h" |
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#include "inet_misc.h" |
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#include "restart.h" |
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#include "s_auth.h" |
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#include "s_conf.h" |
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#include "s_log.h" |
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#include "s_serv.h" |
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#include "send.h" |
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#include "memory.h" |
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#include "s_user.h" |
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#include "hook.h" |
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|
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static const char *comm_err_str[] = { "Comm OK", "Error during bind()", |
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"Error during DNS lookup", "connect timeout", "Error during connect()", |
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"Comm Error" }; |
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|
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struct Callback *setup_socket_cb = NULL; |
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|
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static void comm_connect_callback(fde_t *fd, int status); |
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static PF comm_connect_timeout; |
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static void comm_connect_dns_callback(void *, const struct irc_ssaddr *, const char *); |
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static PF comm_connect_tryconnect; |
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|
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|
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/* check_can_use_v6() |
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* Check if the system can open AF_INET6 sockets |
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*/ |
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void |
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check_can_use_v6(void) |
74 |
{ |
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#ifdef IPV6 |
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int v6; |
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|
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if ((v6 = socket(AF_INET6, SOCK_STREAM, 0)) < 0) |
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ServerInfo.can_use_v6 = 0; |
80 |
else |
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{ |
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ServerInfo.can_use_v6 = 1; |
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#ifdef _WIN32 |
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closesocket(v6); |
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#else |
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close(v6); |
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#endif |
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} |
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#else |
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ServerInfo.can_use_v6 = 0; |
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#endif |
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} |
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|
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/* get_sockerr - get the error value from the socket or the current errno |
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* |
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* Get the *real* error from the socket (well try to anyway..). |
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* This may only work when SO_DEBUG is enabled but its worth the |
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* gamble anyway. |
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*/ |
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int |
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get_sockerr(int fd) |
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{ |
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#ifndef _WIN32 |
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int errtmp = errno; |
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#else |
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int errtmp = WSAGetLastError(); |
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#endif |
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#ifdef SO_ERROR |
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int err = 0; |
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socklen_t len = sizeof(err); |
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|
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if (-1 < fd && !getsockopt(fd, SOL_SOCKET, SO_ERROR, &err, &len)) |
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{ |
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if (err) |
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errtmp = err; |
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} |
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errno = errtmp; |
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#endif |
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return errtmp; |
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} |
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|
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/* |
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* report_error - report an error from an errno. |
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* Record error to log and also send a copy to all *LOCAL* opers online. |
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* |
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* text is a *format* string for outputing error. It must |
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* contain only two '%s', the first will be replaced |
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* by the sockhost from the client_p, and the latter will |
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* be taken from sys_errlist[errno]. |
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* |
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* client_p if not NULL, is the *LOCAL* client associated with |
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* the error. |
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* |
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* Cannot use perror() within daemon. stderr is closed in |
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* ircd and cannot be used. And, worse yet, it might have |
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* been reassigned to a normal connection... |
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* |
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* Actually stderr is still there IFF ircd was run with -s --Rodder |
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*/ |
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|
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void |
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report_error(int level, const char* text, const char* who, int error) |
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{ |
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who = (who) ? who : ""; |
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|
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sendto_realops_flags(UMODE_DEBUG, level, text, who, strerror(error)); |
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log_oper_action(LOG_IOERR_TYPE, NULL, "%s %s %s\n", who, text, strerror(error)); |
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ilog(L_ERROR, text, who, strerror(error)); |
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} |
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|
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/* |
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* setup_socket() |
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* |
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* Set the socket non-blocking, and other wonderful bits. |
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*/ |
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static void * |
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setup_socket(va_list args) |
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{ |
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int fd = va_arg(args, int); |
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int opt = 1; |
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|
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setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof(opt)); |
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|
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#ifdef IPTOS_LOWDELAY |
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opt = IPTOS_LOWDELAY; |
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setsockopt(fd, IPPROTO_IP, IP_TOS, &opt, sizeof(opt)); |
167 |
#endif |
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|
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#ifndef _WIN32 |
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fcntl(fd, F_SETFL, fcntl(fd, F_GETFL, 0) | O_NONBLOCK); |
171 |
#endif |
172 |
|
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return NULL; |
174 |
} |
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|
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/* |
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* init_comm() |
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* |
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* Initializes comm subsystem. |
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*/ |
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void |
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init_comm(void) |
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{ |
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setup_socket_cb = register_callback("setup_socket", setup_socket); |
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init_netio(); |
186 |
} |
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|
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/* |
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* close_connection |
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* Close the physical connection. This function must make |
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* MyConnect(client_p) == FALSE, and set client_p->from == NULL. |
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*/ |
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void |
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close_connection(struct Client *client_p) |
195 |
{ |
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struct ConfItem *conf; |
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struct AccessItem *aconf; |
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struct ClassItem *aclass; |
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|
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assert(NULL != client_p); |
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|
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if (!IsDead(client_p)) |
203 |
{ |
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/* attempt to flush any pending dbufs. Evil, but .. -- adrian */ |
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/* there is still a chance that we might send data to this socket |
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* even if it is marked as blocked (COMM_SELECT_READ handler is called |
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* before COMM_SELECT_WRITE). Let's try, nothing to lose.. -adx |
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*/ |
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ClearSendqBlocked(client_p); |
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send_queued_write(client_p); |
211 |
} |
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|
213 |
if (IsServer(client_p)) |
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{ |
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++ServerStats.is_sv; |
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ServerStats.is_sbs += client_p->localClient->send.bytes; |
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ServerStats.is_sbr += client_p->localClient->recv.bytes; |
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ServerStats.is_sti += CurrentTime - client_p->firsttime; |
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|
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/* XXX Does this even make any sense at all anymore? |
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* scheduling a 'quick' reconnect could cause a pile of |
222 |
* nick collides under TSora protocol... -db |
223 |
*/ |
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/* |
225 |
* If the connection has been up for a long amount of time, schedule |
226 |
* a 'quick' reconnect, else reset the next-connect cycle. |
227 |
*/ |
228 |
if ((conf = find_conf_exact(SERVER_TYPE, |
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client_p->name, client_p->username, |
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client_p->host))) |
231 |
{ |
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/* |
233 |
* Reschedule a faster reconnect, if this was a automatically |
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* connected configuration entry. (Note that if we have had |
235 |
* a rehash in between, the status has been changed to |
236 |
* CONF_ILLEGAL). But only do this if it was a "good" link. |
237 |
*/ |
238 |
aconf = (struct AccessItem *)map_to_conf(conf); |
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aclass = (struct ClassItem *)map_to_conf(aconf->class_ptr); |
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aconf->hold = time(NULL); |
241 |
aconf->hold += (aconf->hold - client_p->since > HANGONGOODLINK) ? |
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HANGONRETRYDELAY : ConFreq(aclass); |
243 |
if (nextconnect > aconf->hold) |
244 |
nextconnect = aconf->hold; |
245 |
} |
246 |
} |
247 |
else if (IsClient(client_p)) |
248 |
{ |
249 |
++ServerStats.is_cl; |
250 |
ServerStats.is_cbs += client_p->localClient->send.bytes; |
251 |
ServerStats.is_cbr += client_p->localClient->recv.bytes; |
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ServerStats.is_cti += CurrentTime - client_p->firsttime; |
253 |
} |
254 |
else |
255 |
++ServerStats.is_ni; |
256 |
|
257 |
#ifdef HAVE_LIBCRYPTO |
258 |
if (client_p->localClient->fd.ssl) |
259 |
{ |
260 |
SSL_set_shutdown(client_p->localClient->fd.ssl, SSL_RECEIVED_SHUTDOWN); |
261 |
|
262 |
if (!SSL_shutdown(client_p->localClient->fd.ssl)) |
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SSL_shutdown(client_p->localClient->fd.ssl); |
264 |
} |
265 |
#endif |
266 |
if (client_p->localClient->fd.flags.open) |
267 |
fd_close(&client_p->localClient->fd); |
268 |
|
269 |
if (HasServlink(client_p)) |
270 |
{ |
271 |
if (client_p->localClient->ctrlfd.flags.open) |
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fd_close(&client_p->localClient->ctrlfd); |
273 |
} |
274 |
|
275 |
dbuf_clear(&client_p->localClient->buf_sendq); |
276 |
dbuf_clear(&client_p->localClient->buf_recvq); |
277 |
|
278 |
MyFree(client_p->localClient->passwd); |
279 |
detach_conf(client_p, CONF_TYPE); |
280 |
client_p->from = NULL; /* ...this should catch them! >:) --msa */ |
281 |
} |
282 |
|
283 |
#ifdef HAVE_LIBCRYPTO |
284 |
/* |
285 |
* ssl_handshake - let OpenSSL initialize the protocol. Register for |
286 |
* read/write events if necessary. |
287 |
*/ |
288 |
static void |
289 |
ssl_handshake(int fd, struct Client *client_p) |
290 |
{ |
291 |
int ret = SSL_accept(client_p->localClient->fd.ssl); |
292 |
|
293 |
if (ret <= 0) |
294 |
switch (SSL_get_error(client_p->localClient->fd.ssl, ret)) |
295 |
{ |
296 |
case SSL_ERROR_WANT_WRITE: |
297 |
comm_setselect(&client_p->localClient->fd, COMM_SELECT_WRITE, |
298 |
(PF *) ssl_handshake, client_p, 0); |
299 |
return; |
300 |
|
301 |
case SSL_ERROR_WANT_READ: |
302 |
comm_setselect(&client_p->localClient->fd, COMM_SELECT_READ, |
303 |
(PF *) ssl_handshake, client_p, 0); |
304 |
return; |
305 |
|
306 |
default: |
307 |
exit_client(client_p, client_p, "Error during SSL handshake"); |
308 |
return; |
309 |
} |
310 |
|
311 |
execute_callback(auth_cb, client_p); |
312 |
} |
313 |
#endif |
314 |
|
315 |
/* |
316 |
* add_connection - creates a client which has just connected to us on |
317 |
* the given fd. The sockhost field is initialized with the ip# of the host. |
318 |
* An unique id is calculated now, in case it is needed for auth. |
319 |
* The client is sent to the auth module for verification, and not put in |
320 |
* any client list yet. |
321 |
*/ |
322 |
void |
323 |
add_connection(struct Listener *listener, struct irc_ssaddr *irn, int fd) |
324 |
{ |
325 |
struct Client *new_client; |
326 |
|
327 |
assert(NULL != listener); |
328 |
|
329 |
new_client = make_client(NULL); |
330 |
|
331 |
fd_open(&new_client->localClient->fd, fd, 1, |
332 |
(listener->flags & LISTENER_SSL) ? |
333 |
"Incoming SSL connection" : "Incoming connection"); |
334 |
|
335 |
/* |
336 |
* copy address to 'sockhost' as a string, copy it to host too |
337 |
* so we have something valid to put into error messages... |
338 |
*/ |
339 |
memcpy(&new_client->localClient->ip, irn, sizeof(struct irc_ssaddr)); |
340 |
|
341 |
irc_getnameinfo((struct sockaddr*)&new_client->localClient->ip, |
342 |
new_client->localClient->ip.ss_len, new_client->sockhost, |
343 |
HOSTIPLEN, NULL, 0, NI_NUMERICHOST); |
344 |
new_client->localClient->aftype = new_client->localClient->ip.ss.ss_family; |
345 |
#ifdef IPV6 |
346 |
if (new_client->sockhost[0] == ':') |
347 |
strlcat(new_client->host, "0", HOSTLEN+1); |
348 |
|
349 |
if (new_client->localClient->aftype == AF_INET6 && |
350 |
ConfigFileEntry.dot_in_ip6_addr == 1) |
351 |
{ |
352 |
strlcat(new_client->host, new_client->sockhost,HOSTLEN+1); |
353 |
strlcat(new_client->host, ".", HOSTLEN+1); |
354 |
} |
355 |
else |
356 |
#endif |
357 |
strlcat(new_client->host, new_client->sockhost,HOSTLEN+1); |
358 |
|
359 |
new_client->localClient->listener = listener; |
360 |
++listener->ref_count; |
361 |
|
362 |
#ifdef HAVE_LIBCRYPTO |
363 |
if (listener->flags & LISTENER_SSL) |
364 |
{ |
365 |
if ((new_client->localClient->fd.ssl = SSL_new(ServerInfo.server_ctx)) == NULL) |
366 |
{ |
367 |
ilog(L_CRIT, "SSL_new() ERROR! -- %s", |
368 |
ERR_error_string(ERR_get_error(), NULL)); |
369 |
|
370 |
SetDead(new_client); |
371 |
exit_client(new_client, new_client, "SSL_new failed"); |
372 |
return; |
373 |
} |
374 |
|
375 |
SSL_set_fd(new_client->localClient->fd.ssl, fd); |
376 |
ssl_handshake(0, new_client); |
377 |
} |
378 |
else |
379 |
#endif |
380 |
execute_callback(auth_cb, new_client); |
381 |
} |
382 |
|
383 |
/* |
384 |
* stolen from squid - its a neat (but overused! :) routine which we |
385 |
* can use to see whether we can ignore this errno or not. It is |
386 |
* generally useful for non-blocking network IO related errnos. |
387 |
* -- adrian |
388 |
*/ |
389 |
int |
390 |
ignoreErrno(int ierrno) |
391 |
{ |
392 |
switch (ierrno) |
393 |
{ |
394 |
case EINPROGRESS: |
395 |
case EWOULDBLOCK: |
396 |
#if EAGAIN != EWOULDBLOCK |
397 |
case EAGAIN: |
398 |
#endif |
399 |
case EALREADY: |
400 |
case EINTR: |
401 |
#ifdef ERESTART |
402 |
case ERESTART: |
403 |
#endif |
404 |
return 1; |
405 |
default: |
406 |
return 0; |
407 |
} |
408 |
} |
409 |
|
410 |
/* |
411 |
* comm_settimeout() - set the socket timeout |
412 |
* |
413 |
* Set the timeout for the fd |
414 |
*/ |
415 |
void |
416 |
comm_settimeout(fde_t *fd, time_t timeout, PF *callback, void *cbdata) |
417 |
{ |
418 |
assert(fd->flags.open); |
419 |
|
420 |
fd->timeout = CurrentTime + (timeout / 1000); |
421 |
fd->timeout_handler = callback; |
422 |
fd->timeout_data = cbdata; |
423 |
} |
424 |
|
425 |
/* |
426 |
* comm_setflush() - set a flush function |
427 |
* |
428 |
* A flush function is simply a function called if found during |
429 |
* comm_timeouts(). Its basically a second timeout, except in this case |
430 |
* I'm too lazy to implement multiple timeout functions! :-) |
431 |
* its kinda nice to have it separate, since this is designed for |
432 |
* flush functions, and when comm_close() is implemented correctly |
433 |
* with close functions, we _actually_ don't call comm_close() here .. |
434 |
* -- originally Adrian's notes |
435 |
* comm_close() is replaced with fd_close() in fdlist.c |
436 |
*/ |
437 |
void |
438 |
comm_setflush(fde_t *fd, time_t timeout, PF *callback, void *cbdata) |
439 |
{ |
440 |
assert(fd->flags.open); |
441 |
|
442 |
fd->flush_timeout = CurrentTime + (timeout / 1000); |
443 |
fd->flush_handler = callback; |
444 |
fd->flush_data = cbdata; |
445 |
} |
446 |
|
447 |
/* |
448 |
* comm_checktimeouts() - check the socket timeouts |
449 |
* |
450 |
* All this routine does is call the given callback/cbdata, without closing |
451 |
* down the file descriptor. When close handlers have been implemented, |
452 |
* this will happen. |
453 |
*/ |
454 |
void |
455 |
comm_checktimeouts(void *notused) |
456 |
{ |
457 |
int i; |
458 |
fde_t *F; |
459 |
PF *hdl; |
460 |
void *data; |
461 |
|
462 |
for (i = 0; i < FD_HASH_SIZE; i++) |
463 |
for (F = fd_hash[i]; F != NULL; F = fd_next_in_loop) |
464 |
{ |
465 |
assert(F->flags.open); |
466 |
fd_next_in_loop = F->hnext; |
467 |
|
468 |
/* check flush functions */ |
469 |
if (F->flush_handler && F->flush_timeout > 0 && |
470 |
F->flush_timeout < CurrentTime) |
471 |
{ |
472 |
hdl = F->flush_handler; |
473 |
data = F->flush_data; |
474 |
comm_setflush(F, 0, NULL, NULL); |
475 |
hdl(F, data); |
476 |
} |
477 |
|
478 |
/* check timeouts */ |
479 |
if (F->timeout_handler && F->timeout > 0 && |
480 |
F->timeout < CurrentTime) |
481 |
{ |
482 |
/* Call timeout handler */ |
483 |
hdl = F->timeout_handler; |
484 |
data = F->timeout_data; |
485 |
comm_settimeout(F, 0, NULL, NULL); |
486 |
hdl(F, data); |
487 |
} |
488 |
} |
489 |
} |
490 |
|
491 |
/* |
492 |
* void comm_connect_tcp(int fd, const char *host, unsigned short port, |
493 |
* struct sockaddr *clocal, int socklen, |
494 |
* CNCB *callback, void *data, int aftype, int timeout) |
495 |
* Input: An fd to connect with, a host and port to connect to, |
496 |
* a local sockaddr to connect from + length(or NULL to use the |
497 |
* default), a callback, the data to pass into the callback, the |
498 |
* address family. |
499 |
* Output: None. |
500 |
* Side-effects: A non-blocking connection to the host is started, and |
501 |
* if necessary, set up for selection. The callback given |
502 |
* may be called now, or it may be called later. |
503 |
*/ |
504 |
void |
505 |
comm_connect_tcp(fde_t *fd, const char *host, unsigned short port, |
506 |
struct sockaddr *clocal, int socklen, CNCB *callback, |
507 |
void *data, int aftype, int timeout) |
508 |
{ |
509 |
struct addrinfo hints, *res; |
510 |
char portname[PORTNAMELEN + 1]; |
511 |
|
512 |
assert(callback); |
513 |
fd->connect.callback = callback; |
514 |
fd->connect.data = data; |
515 |
|
516 |
fd->connect.hostaddr.ss.ss_family = aftype; |
517 |
fd->connect.hostaddr.ss_port = htons(port); |
518 |
|
519 |
/* Note that we're using a passed sockaddr here. This is because |
520 |
* generally you'll be bind()ing to a sockaddr grabbed from |
521 |
* getsockname(), so this makes things easier. |
522 |
* XXX If NULL is passed as local, we should later on bind() to the |
523 |
* virtual host IP, for completeness. |
524 |
* -- adrian |
525 |
*/ |
526 |
if ((clocal != NULL) && (bind(fd->fd, clocal, socklen) < 0)) |
527 |
{ |
528 |
/* Failure, call the callback with COMM_ERR_BIND */ |
529 |
comm_connect_callback(fd, COMM_ERR_BIND); |
530 |
/* ... and quit */ |
531 |
return; |
532 |
} |
533 |
|
534 |
/* Next, if we have been given an IP, get the addr and skip the |
535 |
* DNS check (and head direct to comm_connect_tryconnect(). |
536 |
*/ |
537 |
memset(&hints, 0, sizeof(hints)); |
538 |
hints.ai_family = AF_UNSPEC; |
539 |
hints.ai_socktype = SOCK_STREAM; |
540 |
hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; |
541 |
|
542 |
snprintf(portname, sizeof(portname), "%d", port); |
543 |
|
544 |
if (irc_getaddrinfo(host, portname, &hints, &res)) |
545 |
{ |
546 |
/* Send the DNS request, for the next level */ |
547 |
if (aftype == AF_INET6) |
548 |
gethost_byname_type(comm_connect_dns_callback, fd, host, T_AAAA); |
549 |
else |
550 |
gethost_byname_type(comm_connect_dns_callback, fd, host, T_A); |
551 |
} |
552 |
else |
553 |
{ |
554 |
/* We have a valid IP, so we just call tryconnect */ |
555 |
/* Make sure we actually set the timeout here .. */ |
556 |
assert(res != NULL); |
557 |
memcpy(&fd->connect.hostaddr, res->ai_addr, res->ai_addrlen); |
558 |
fd->connect.hostaddr.ss_len = res->ai_addrlen; |
559 |
fd->connect.hostaddr.ss.ss_family = res->ai_family; |
560 |
irc_freeaddrinfo(res); |
561 |
comm_settimeout(fd, timeout*1000, comm_connect_timeout, NULL); |
562 |
comm_connect_tryconnect(fd, NULL); |
563 |
} |
564 |
} |
565 |
|
566 |
/* |
567 |
* comm_connect_callback() - call the callback, and continue with life |
568 |
*/ |
569 |
static void |
570 |
comm_connect_callback(fde_t *fd, int status) |
571 |
{ |
572 |
CNCB *hdl; |
573 |
|
574 |
/* This check is gross..but probably necessary */ |
575 |
if (fd->connect.callback == NULL) |
576 |
return; |
577 |
|
578 |
/* Clear the connect flag + handler */ |
579 |
hdl = fd->connect.callback; |
580 |
fd->connect.callback = NULL; |
581 |
|
582 |
/* Clear the timeout handler */ |
583 |
comm_settimeout(fd, 0, NULL, NULL); |
584 |
|
585 |
/* Call the handler */ |
586 |
hdl(fd, status, fd->connect.data); |
587 |
} |
588 |
|
589 |
/* |
590 |
* comm_connect_timeout() - this gets called when the socket connection |
591 |
* times out. This *only* can be called once connect() is initially |
592 |
* called .. |
593 |
*/ |
594 |
static void |
595 |
comm_connect_timeout(fde_t *fd, void *notused) |
596 |
{ |
597 |
/* error! */ |
598 |
comm_connect_callback(fd, COMM_ERR_TIMEOUT); |
599 |
} |
600 |
|
601 |
/* |
602 |
* comm_connect_dns_callback() - called at the completion of the DNS request |
603 |
* |
604 |
* The DNS request has completed, so if we've got an error, return it, |
605 |
* otherwise we initiate the connect() |
606 |
*/ |
607 |
static void |
608 |
comm_connect_dns_callback(void *vptr, const struct irc_ssaddr *addr, const char *name) |
609 |
{ |
610 |
fde_t *F = vptr; |
611 |
|
612 |
if (name == NULL) |
613 |
{ |
614 |
comm_connect_callback(F, COMM_ERR_DNS); |
615 |
return; |
616 |
} |
617 |
|
618 |
/* No error, set a 10 second timeout */ |
619 |
comm_settimeout(F, 30*1000, comm_connect_timeout, NULL); |
620 |
|
621 |
/* Copy over the DNS reply info so we can use it in the connect() */ |
622 |
/* |
623 |
* Note we don't fudge the refcount here, because we aren't keeping |
624 |
* the DNS record around, and the DNS cache is gone anyway.. |
625 |
* -- adrian |
626 |
*/ |
627 |
memcpy(&F->connect.hostaddr, addr, addr->ss_len); |
628 |
/* The cast is hacky, but safe - port offset is same on v4 and v6 */ |
629 |
((struct sockaddr_in *) &F->connect.hostaddr)->sin_port = |
630 |
F->connect.hostaddr.ss_port; |
631 |
F->connect.hostaddr.ss_len = addr->ss_len; |
632 |
|
633 |
/* Now, call the tryconnect() routine to try a connect() */ |
634 |
comm_connect_tryconnect(F, NULL); |
635 |
} |
636 |
|
637 |
/* static void comm_connect_tryconnect(int fd, void *notused) |
638 |
* Input: The fd, the handler data(unused). |
639 |
* Output: None. |
640 |
* Side-effects: Try and connect with pending connect data for the FD. If |
641 |
* we succeed or get a fatal error, call the callback. |
642 |
* Otherwise, it is still blocking or something, so register |
643 |
* to select for a write event on this FD. |
644 |
*/ |
645 |
static void |
646 |
comm_connect_tryconnect(fde_t *fd, void *notused) |
647 |
{ |
648 |
int retval; |
649 |
|
650 |
/* This check is needed or re-entrant s_bsd_* like sigio break it. */ |
651 |
if (fd->connect.callback == NULL) |
652 |
return; |
653 |
|
654 |
/* Try the connect() */ |
655 |
retval = connect(fd->fd, (struct sockaddr *) &fd->connect.hostaddr, |
656 |
fd->connect.hostaddr.ss_len); |
657 |
|
658 |
/* Error? */ |
659 |
if (retval < 0) |
660 |
{ |
661 |
#ifdef _WIN32 |
662 |
errno = WSAGetLastError(); |
663 |
#endif |
664 |
/* |
665 |
* If we get EISCONN, then we've already connect()ed the socket, |
666 |
* which is a good thing. |
667 |
* -- adrian |
668 |
*/ |
669 |
if (errno == EISCONN) |
670 |
comm_connect_callback(fd, COMM_OK); |
671 |
else if (ignoreErrno(errno)) |
672 |
/* Ignore error? Reschedule */ |
673 |
comm_setselect(fd, COMM_SELECT_WRITE, comm_connect_tryconnect, |
674 |
NULL, 0); |
675 |
else |
676 |
/* Error? Fail with COMM_ERR_CONNECT */ |
677 |
comm_connect_callback(fd, COMM_ERR_CONNECT); |
678 |
return; |
679 |
} |
680 |
|
681 |
/* If we get here, we've suceeded, so call with COMM_OK */ |
682 |
comm_connect_callback(fd, COMM_OK); |
683 |
} |
684 |
|
685 |
/* |
686 |
* comm_errorstr() - return an error string for the given error condition |
687 |
*/ |
688 |
const char * |
689 |
comm_errstr(int error) |
690 |
{ |
691 |
if (error < 0 || error >= COMM_ERR_MAX) |
692 |
return "Invalid error number!"; |
693 |
return comm_err_str[error]; |
694 |
} |
695 |
|
696 |
/* |
697 |
* comm_open() - open a socket |
698 |
* |
699 |
* This is a highly highly cut down version of squid's comm_open() which |
700 |
* for the most part emulates socket(), *EXCEPT* it fails if we're about |
701 |
* to run out of file descriptors. |
702 |
*/ |
703 |
int |
704 |
comm_open(fde_t *F, int family, int sock_type, int proto, const char *note) |
705 |
{ |
706 |
int fd; |
707 |
|
708 |
/* First, make sure we aren't going to run out of file descriptors */ |
709 |
if (number_fd >= hard_fdlimit) |
710 |
{ |
711 |
errno = ENFILE; |
712 |
return -1; |
713 |
} |
714 |
|
715 |
/* |
716 |
* Next, we try to open the socket. We *should* drop the reserved FD |
717 |
* limit if/when we get an error, but we can deal with that later. |
718 |
* XXX !!! -- adrian |
719 |
*/ |
720 |
fd = socket(family, sock_type, proto); |
721 |
if (fd < 0) |
722 |
{ |
723 |
#ifdef _WIN32 |
724 |
errno = WSAGetLastError(); |
725 |
#endif |
726 |
return -1; /* errno will be passed through, yay.. */ |
727 |
} |
728 |
|
729 |
execute_callback(setup_socket_cb, fd); |
730 |
|
731 |
/* update things in our fd tracking */ |
732 |
fd_open(F, fd, 1, note); |
733 |
return 0; |
734 |
} |
735 |
|
736 |
/* |
737 |
* comm_accept() - accept an incoming connection |
738 |
* |
739 |
* This is a simple wrapper for accept() which enforces FD limits like |
740 |
* comm_open() does. Returned fd must be either closed or tagged with |
741 |
* fd_open (this function no longer does it). |
742 |
*/ |
743 |
int |
744 |
comm_accept(struct Listener *lptr, struct irc_ssaddr *pn) |
745 |
{ |
746 |
int newfd; |
747 |
socklen_t addrlen = sizeof(struct irc_ssaddr); |
748 |
|
749 |
if (number_fd >= hard_fdlimit) |
750 |
{ |
751 |
errno = ENFILE; |
752 |
return -1; |
753 |
} |
754 |
|
755 |
/* |
756 |
* Next, do the accept(). if we get an error, we should drop the |
757 |
* reserved fd limit, but we can deal with that when comm_open() |
758 |
* also does it. XXX -- adrian |
759 |
*/ |
760 |
newfd = accept(lptr->fd.fd, (struct sockaddr *)pn, (socklen_t *)&addrlen); |
761 |
if (newfd < 0) |
762 |
{ |
763 |
#ifdef _WIN32 |
764 |
errno = WSAGetLastError(); |
765 |
#endif |
766 |
return -1; |
767 |
} |
768 |
|
769 |
#ifdef IPV6 |
770 |
remove_ipv6_mapping(pn); |
771 |
#else |
772 |
pn->ss_len = addrlen; |
773 |
#endif |
774 |
|
775 |
execute_callback(setup_socket_cb, newfd); |
776 |
|
777 |
/* .. and return */ |
778 |
return newfd; |
779 |
} |
780 |
|
781 |
/* |
782 |
* remove_ipv6_mapping() - Removes IPv4-In-IPv6 mapping from an address |
783 |
* This function should really inspect the struct itself rather than relying |
784 |
* on inet_pton and inet_ntop. OSes with IPv6 mapping listening on both |
785 |
* AF_INET and AF_INET6 map AF_INET connections inside AF_INET6 structures |
786 |
* |
787 |
*/ |
788 |
#ifdef IPV6 |
789 |
void |
790 |
remove_ipv6_mapping(struct irc_ssaddr *addr) |
791 |
{ |
792 |
if (addr->ss.ss_family == AF_INET6) |
793 |
{ |
794 |
struct sockaddr_in6 *v6; |
795 |
|
796 |
v6 = (struct sockaddr_in6*)addr; |
797 |
if (IN6_IS_ADDR_V4MAPPED(&v6->sin6_addr)) |
798 |
{ |
799 |
char v4ip[HOSTIPLEN]; |
800 |
struct sockaddr_in *v4 = (struct sockaddr_in*)addr; |
801 |
inetntop(AF_INET6, &v6->sin6_addr, v4ip, HOSTIPLEN); |
802 |
inet_pton(AF_INET, v4ip, &v4->sin_addr); |
803 |
addr->ss.ss_family = AF_INET; |
804 |
addr->ss_len = sizeof(struct sockaddr_in); |
805 |
} |
806 |
else |
807 |
addr->ss_len = sizeof(struct sockaddr_in6); |
808 |
} |
809 |
else |
810 |
addr->ss_len = sizeof(struct sockaddr_in); |
811 |
} |
812 |
#endif |