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/* |
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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 |
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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 |
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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> |
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#endif |
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#include "fdlist.h" |
32 |
#include "s_bsd.h" |
33 |
#include "client.h" |
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#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" |
39 |
#include "irc_getaddrinfo.h" |
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#include "ircd.h" |
41 |
#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 "s_stats.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 *vptr, struct DNSReply *reply); |
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static PF comm_connect_tryconnect; |
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|
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extern void init_netio(void); |
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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 |
75 |
check_can_use_v6(void) |
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{ |
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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; |
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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, (char*) &err, (socklen_t *)&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, (char *) &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, (char *) &opt, sizeof(opt)); |
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#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); |
173 |
#endif |
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|
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return NULL; |
176 |
} |
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|
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/* |
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* init_comm() |
180 |
* |
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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(); |
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} |
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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) |
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{ |
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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)) |
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{ |
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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); |
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} |
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|
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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 |
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* nick collides under TSora protocol... -db |
225 |
*/ |
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/* |
227 |
* If the connection has been up for a long amount of time, schedule |
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* a 'quick' reconnect, else reset the next-connect cycle. |
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*/ |
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if ((conf = find_conf_exact(SERVER_TYPE, |
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client_p->name, client_p->username, |
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client_p->host))) |
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{ |
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/* |
235 |
* Reschedule a faster reconnect, if this was a automatically |
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* connected configuration entry. (Note that if we have had |
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* a rehash in between, the status has been changed to |
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* CONF_ILLEGAL). But only do this if it was a "good" link. |
239 |
*/ |
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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); |
243 |
aconf->hold += (aconf->hold - client_p->since > HANGONGOODLINK) ? |
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HANGONRETRYDELAY : ConFreq(aclass); |
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if (nextconnect > aconf->hold) |
246 |
nextconnect = aconf->hold; |
247 |
} |
248 |
} |
249 |
else if (IsClient(client_p)) |
250 |
{ |
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ServerStats->is_cl++; |
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ServerStats->is_cbs += client_p->localClient->send.bytes; |
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ServerStats->is_cbr += client_p->localClient->recv.bytes; |
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ServerStats->is_cti += CurrentTime - client_p->firsttime; |
255 |
} |
256 |
else |
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ServerStats->is_ni++; |
258 |
|
259 |
#ifdef HAVE_LIBCRYPTO |
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if (client_p->localClient->fd.ssl) |
261 |
{ |
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SSL_set_shutdown(client_p->localClient->fd.ssl, SSL_RECEIVED_SHUTDOWN); |
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|
264 |
if (!SSL_shutdown(client_p->localClient->fd.ssl)) |
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SSL_shutdown(client_p->localClient->fd.ssl); |
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} |
267 |
#endif |
268 |
if (client_p->localClient->fd.flags.open) |
269 |
fd_close(&client_p->localClient->fd); |
270 |
|
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if (HasServlink(client_p)) |
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{ |
273 |
if (client_p->localClient->ctrlfd.flags.open) |
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fd_close(&client_p->localClient->ctrlfd); |
275 |
} |
276 |
|
277 |
dbuf_clear(&client_p->localClient->buf_sendq); |
278 |
dbuf_clear(&client_p->localClient->buf_recvq); |
279 |
|
280 |
MyFree(client_p->localClient->passwd); |
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detach_conf(client_p, CONF_TYPE); |
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client_p->from = NULL; /* ...this should catch them! >:) --msa */ |
283 |
} |
284 |
|
285 |
#ifdef HAVE_LIBCRYPTO |
286 |
/* |
287 |
* ssl_handshake - let OpenSSL initialize the protocol. Register for |
288 |
* read/write events if necessary. |
289 |
*/ |
290 |
static void |
291 |
ssl_handshake(int fd, struct Client *client_p) |
292 |
{ |
293 |
int ret = SSL_accept(client_p->localClient->fd.ssl); |
294 |
|
295 |
if (ret <= 0) |
296 |
switch (SSL_get_error(client_p->localClient->fd.ssl, ret)) |
297 |
{ |
298 |
case SSL_ERROR_WANT_WRITE: |
299 |
comm_setselect(&client_p->localClient->fd, COMM_SELECT_WRITE, |
300 |
(PF *) ssl_handshake, client_p, 0); |
301 |
return; |
302 |
|
303 |
case SSL_ERROR_WANT_READ: |
304 |
comm_setselect(&client_p->localClient->fd, COMM_SELECT_READ, |
305 |
(PF *) ssl_handshake, client_p, 0); |
306 |
return; |
307 |
|
308 |
default: |
309 |
exit_client(client_p, client_p, "Error during SSL handshake"); |
310 |
return; |
311 |
} |
312 |
|
313 |
execute_callback(auth_cb, client_p); |
314 |
} |
315 |
#endif |
316 |
|
317 |
/* |
318 |
* add_connection - creates a client which has just connected to us on |
319 |
* the given fd. The sockhost field is initialized with the ip# of the host. |
320 |
* An unique id is calculated now, in case it is needed for auth. |
321 |
* The client is sent to the auth module for verification, and not put in |
322 |
* any client list yet. |
323 |
*/ |
324 |
void |
325 |
add_connection(struct Listener *listener, struct irc_ssaddr *irn, int fd) |
326 |
{ |
327 |
struct Client *new_client; |
328 |
|
329 |
assert(NULL != listener); |
330 |
|
331 |
new_client = make_client(NULL); |
332 |
|
333 |
fd_open(&new_client->localClient->fd, fd, 1, |
334 |
(listener->flags & LISTENER_SSL) ? |
335 |
"Incoming SSL connection" : "Incoming connection"); |
336 |
|
337 |
/* |
338 |
* copy address to 'sockhost' as a string, copy it to host too |
339 |
* so we have something valid to put into error messages... |
340 |
*/ |
341 |
memcpy(&new_client->localClient->ip, irn, sizeof(struct irc_ssaddr)); |
342 |
|
343 |
irc_getnameinfo((struct sockaddr*)&new_client->localClient->ip, |
344 |
new_client->localClient->ip.ss_len, new_client->sockhost, |
345 |
HOSTIPLEN, NULL, 0, NI_NUMERICHOST); |
346 |
new_client->localClient->aftype = new_client->localClient->ip.ss.ss_family; |
347 |
#ifdef IPV6 |
348 |
if (new_client->sockhost[0] == ':') |
349 |
strlcat(new_client->host, "0", HOSTLEN+1); |
350 |
|
351 |
if (new_client->localClient->aftype == AF_INET6 && |
352 |
ConfigFileEntry.dot_in_ip6_addr == 1) |
353 |
{ |
354 |
strlcat(new_client->host, new_client->sockhost,HOSTLEN+1); |
355 |
strlcat(new_client->host, ".", HOSTLEN+1); |
356 |
} |
357 |
else |
358 |
#endif |
359 |
strlcat(new_client->host, new_client->sockhost,HOSTLEN+1); |
360 |
|
361 |
new_client->connect_id = ++connect_id; |
362 |
new_client->localClient->listener = listener; |
363 |
++listener->ref_count; |
364 |
|
365 |
#ifdef HAVE_LIBCRYPTO |
366 |
if (listener->flags & LISTENER_SSL) |
367 |
{ |
368 |
if ((new_client->localClient->fd.ssl = SSL_new(ServerInfo.ctx)) == NULL) |
369 |
{ |
370 |
ilog(L_CRIT, "SSL_new() ERROR! -- %s", |
371 |
ERR_error_string(ERR_get_error(), NULL)); |
372 |
|
373 |
SetDead(new_client); |
374 |
exit_client(new_client, new_client, "SSL_new failed"); |
375 |
return; |
376 |
} |
377 |
|
378 |
SSL_set_fd(new_client->localClient->fd.ssl, fd); |
379 |
ssl_handshake(0, new_client); |
380 |
} |
381 |
else |
382 |
#endif |
383 |
execute_callback(auth_cb, new_client); |
384 |
} |
385 |
|
386 |
/* |
387 |
* stolen from squid - its a neat (but overused! :) routine which we |
388 |
* can use to see whether we can ignore this errno or not. It is |
389 |
* generally useful for non-blocking network IO related errnos. |
390 |
* -- adrian |
391 |
*/ |
392 |
int |
393 |
ignoreErrno(int ierrno) |
394 |
{ |
395 |
switch (ierrno) |
396 |
{ |
397 |
case EINPROGRESS: |
398 |
case EWOULDBLOCK: |
399 |
#if EAGAIN != EWOULDBLOCK |
400 |
case EAGAIN: |
401 |
#endif |
402 |
case EALREADY: |
403 |
case EINTR: |
404 |
#ifdef ERESTART |
405 |
case ERESTART: |
406 |
#endif |
407 |
return 1; |
408 |
default: |
409 |
return 0; |
410 |
} |
411 |
} |
412 |
|
413 |
/* |
414 |
* comm_settimeout() - set the socket timeout |
415 |
* |
416 |
* Set the timeout for the fd |
417 |
*/ |
418 |
void |
419 |
comm_settimeout(fde_t *fd, time_t timeout, PF *callback, void *cbdata) |
420 |
{ |
421 |
assert(fd->flags.open); |
422 |
|
423 |
fd->timeout = CurrentTime + (timeout / 1000); |
424 |
fd->timeout_handler = callback; |
425 |
fd->timeout_data = cbdata; |
426 |
} |
427 |
|
428 |
/* |
429 |
* comm_setflush() - set a flush function |
430 |
* |
431 |
* A flush function is simply a function called if found during |
432 |
* comm_timeouts(). Its basically a second timeout, except in this case |
433 |
* I'm too lazy to implement multiple timeout functions! :-) |
434 |
* its kinda nice to have it separate, since this is designed for |
435 |
* flush functions, and when comm_close() is implemented correctly |
436 |
* with close functions, we _actually_ don't call comm_close() here .. |
437 |
* -- originally Adrian's notes |
438 |
* comm_close() is replaced with fd_close() in fdlist.c |
439 |
*/ |
440 |
void |
441 |
comm_setflush(fde_t *fd, time_t timeout, PF *callback, void *cbdata) |
442 |
{ |
443 |
assert(fd->flags.open); |
444 |
|
445 |
fd->flush_timeout = CurrentTime + (timeout / 1000); |
446 |
fd->flush_handler = callback; |
447 |
fd->flush_data = cbdata; |
448 |
} |
449 |
|
450 |
/* |
451 |
* comm_checktimeouts() - check the socket timeouts |
452 |
* |
453 |
* All this routine does is call the given callback/cbdata, without closing |
454 |
* down the file descriptor. When close handlers have been implemented, |
455 |
* this will happen. |
456 |
*/ |
457 |
void |
458 |
comm_checktimeouts(void *notused) |
459 |
{ |
460 |
int i; |
461 |
fde_t *F; |
462 |
PF *hdl; |
463 |
void *data; |
464 |
|
465 |
for (i = 0; i < FD_HASH_SIZE; i++) |
466 |
for (F = fd_hash[i]; F != NULL; F = fd_next_in_loop) |
467 |
{ |
468 |
assert(F->flags.open); |
469 |
fd_next_in_loop = F->hnext; |
470 |
|
471 |
/* check flush functions */ |
472 |
if (F->flush_handler && F->flush_timeout > 0 && |
473 |
F->flush_timeout < CurrentTime) |
474 |
{ |
475 |
hdl = F->flush_handler; |
476 |
data = F->flush_data; |
477 |
comm_setflush(F, 0, NULL, NULL); |
478 |
hdl(F, data); |
479 |
} |
480 |
|
481 |
/* check timeouts */ |
482 |
if (F->timeout_handler && F->timeout > 0 && |
483 |
F->timeout < CurrentTime) |
484 |
{ |
485 |
/* Call timeout handler */ |
486 |
hdl = F->timeout_handler; |
487 |
data = F->timeout_data; |
488 |
comm_settimeout(F, 0, NULL, NULL); |
489 |
hdl(F, data); |
490 |
} |
491 |
} |
492 |
} |
493 |
|
494 |
/* |
495 |
* void comm_connect_tcp(int fd, const char *host, unsigned short port, |
496 |
* struct sockaddr *clocal, int socklen, |
497 |
* CNCB *callback, void *data, int aftype, int timeout) |
498 |
* Input: An fd to connect with, a host and port to connect to, |
499 |
* a local sockaddr to connect from + length(or NULL to use the |
500 |
* default), a callback, the data to pass into the callback, the |
501 |
* address family. |
502 |
* Output: None. |
503 |
* Side-effects: A non-blocking connection to the host is started, and |
504 |
* if necessary, set up for selection. The callback given |
505 |
* may be called now, or it may be called later. |
506 |
*/ |
507 |
void |
508 |
comm_connect_tcp(fde_t *fd, const char *host, unsigned short port, |
509 |
struct sockaddr *clocal, int socklen, CNCB *callback, |
510 |
void *data, int aftype, int timeout) |
511 |
{ |
512 |
struct addrinfo hints, *res; |
513 |
char portname[PORTNAMELEN+1]; |
514 |
|
515 |
assert(callback); |
516 |
fd->connect.callback = callback; |
517 |
fd->connect.data = data; |
518 |
|
519 |
fd->connect.hostaddr.ss.ss_family = aftype; |
520 |
fd->connect.hostaddr.ss_port = htons(port); |
521 |
|
522 |
/* Note that we're using a passed sockaddr here. This is because |
523 |
* generally you'll be bind()ing to a sockaddr grabbed from |
524 |
* getsockname(), so this makes things easier. |
525 |
* XXX If NULL is passed as local, we should later on bind() to the |
526 |
* virtual host IP, for completeness. |
527 |
* -- adrian |
528 |
*/ |
529 |
if ((clocal != NULL) && (bind(fd->fd, clocal, socklen) < 0)) |
530 |
{ |
531 |
/* Failure, call the callback with COMM_ERR_BIND */ |
532 |
comm_connect_callback(fd, COMM_ERR_BIND); |
533 |
/* ... and quit */ |
534 |
return; |
535 |
} |
536 |
|
537 |
/* Next, if we have been given an IP, get the addr and skip the |
538 |
* DNS check (and head direct to comm_connect_tryconnect(). |
539 |
*/ |
540 |
memset(&hints, 0, sizeof(hints)); |
541 |
hints.ai_family = AF_UNSPEC; |
542 |
hints.ai_socktype = SOCK_STREAM; |
543 |
hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; |
544 |
|
545 |
snprintf(portname, PORTNAMELEN, "%d", port); |
546 |
|
547 |
if (irc_getaddrinfo(host, portname, &hints, &res)) |
548 |
{ |
549 |
/* Send the DNS request, for the next level */ |
550 |
fd->dns_query = MyMalloc(sizeof(struct DNSQuery)); |
551 |
fd->dns_query->ptr = fd; |
552 |
fd->dns_query->callback = comm_connect_dns_callback; |
553 |
if (aftype == AF_INET6) |
554 |
gethost_byname_type(host, fd->dns_query, T_AAAA); |
555 |
else |
556 |
gethost_byname_type(host, fd->dns_query, T_A); |
557 |
} |
558 |
else |
559 |
{ |
560 |
/* We have a valid IP, so we just call tryconnect */ |
561 |
/* Make sure we actually set the timeout here .. */ |
562 |
assert(res != NULL); |
563 |
memcpy(&fd->connect.hostaddr, res->ai_addr, res->ai_addrlen); |
564 |
fd->connect.hostaddr.ss_len = res->ai_addrlen; |
565 |
fd->connect.hostaddr.ss.ss_family = res->ai_family; |
566 |
irc_freeaddrinfo(res); |
567 |
comm_settimeout(fd, timeout*1000, comm_connect_timeout, NULL); |
568 |
comm_connect_tryconnect(fd, NULL); |
569 |
} |
570 |
} |
571 |
|
572 |
/* |
573 |
* comm_connect_callback() - call the callback, and continue with life |
574 |
*/ |
575 |
static void |
576 |
comm_connect_callback(fde_t *fd, int status) |
577 |
{ |
578 |
CNCB *hdl; |
579 |
|
580 |
/* This check is gross..but probably necessary */ |
581 |
if (fd->connect.callback == NULL) |
582 |
return; |
583 |
|
584 |
/* Clear the connect flag + handler */ |
585 |
hdl = fd->connect.callback; |
586 |
fd->connect.callback = NULL; |
587 |
|
588 |
/* Clear the timeout handler */ |
589 |
comm_settimeout(fd, 0, NULL, NULL); |
590 |
|
591 |
/* Call the handler */ |
592 |
hdl(fd, status, fd->connect.data); |
593 |
} |
594 |
|
595 |
/* |
596 |
* comm_connect_timeout() - this gets called when the socket connection |
597 |
* times out. This *only* can be called once connect() is initially |
598 |
* called .. |
599 |
*/ |
600 |
static void |
601 |
comm_connect_timeout(fde_t *fd, void *notused) |
602 |
{ |
603 |
/* error! */ |
604 |
comm_connect_callback(fd, COMM_ERR_TIMEOUT); |
605 |
} |
606 |
|
607 |
/* |
608 |
* comm_connect_dns_callback() - called at the completion of the DNS request |
609 |
* |
610 |
* The DNS request has completed, so if we've got an error, return it, |
611 |
* otherwise we initiate the connect() |
612 |
*/ |
613 |
static void |
614 |
comm_connect_dns_callback(void *vptr, struct DNSReply *reply) |
615 |
{ |
616 |
fde_t *F = vptr; |
617 |
|
618 |
if (reply == NULL) |
619 |
{ |
620 |
MyFree(F->dns_query); |
621 |
F->dns_query = NULL; |
622 |
comm_connect_callback(F, COMM_ERR_DNS); |
623 |
return; |
624 |
} |
625 |
|
626 |
/* No error, set a 10 second timeout */ |
627 |
comm_settimeout(F, 30*1000, comm_connect_timeout, NULL); |
628 |
|
629 |
/* Copy over the DNS reply info so we can use it in the connect() */ |
630 |
/* |
631 |
* Note we don't fudge the refcount here, because we aren't keeping |
632 |
* the DNS record around, and the DNS cache is gone anyway.. |
633 |
* -- adrian |
634 |
*/ |
635 |
memcpy(&F->connect.hostaddr, &reply->addr, reply->addr.ss_len); |
636 |
/* The cast is hacky, but safe - port offset is same on v4 and v6 */ |
637 |
((struct sockaddr_in *) &F->connect.hostaddr)->sin_port = |
638 |
F->connect.hostaddr.ss_port; |
639 |
F->connect.hostaddr.ss_len = reply->addr.ss_len; |
640 |
|
641 |
/* Now, call the tryconnect() routine to try a connect() */ |
642 |
MyFree(F->dns_query); |
643 |
F->dns_query = NULL; |
644 |
comm_connect_tryconnect(F, NULL); |
645 |
} |
646 |
|
647 |
/* static void comm_connect_tryconnect(int fd, void *notused) |
648 |
* Input: The fd, the handler data(unused). |
649 |
* Output: None. |
650 |
* Side-effects: Try and connect with pending connect data for the FD. If |
651 |
* we succeed or get a fatal error, call the callback. |
652 |
* Otherwise, it is still blocking or something, so register |
653 |
* to select for a write event on this FD. |
654 |
*/ |
655 |
static void |
656 |
comm_connect_tryconnect(fde_t *fd, void *notused) |
657 |
{ |
658 |
int retval; |
659 |
|
660 |
/* This check is needed or re-entrant s_bsd_* like sigio break it. */ |
661 |
if (fd->connect.callback == NULL) |
662 |
return; |
663 |
|
664 |
/* Try the connect() */ |
665 |
retval = connect(fd->fd, (struct sockaddr *) &fd->connect.hostaddr, |
666 |
fd->connect.hostaddr.ss_len); |
667 |
|
668 |
/* Error? */ |
669 |
if (retval < 0) |
670 |
{ |
671 |
#ifdef _WIN32 |
672 |
errno = WSAGetLastError(); |
673 |
#endif |
674 |
/* |
675 |
* If we get EISCONN, then we've already connect()ed the socket, |
676 |
* which is a good thing. |
677 |
* -- adrian |
678 |
*/ |
679 |
if (errno == EISCONN) |
680 |
comm_connect_callback(fd, COMM_OK); |
681 |
else if (ignoreErrno(errno)) |
682 |
/* Ignore error? Reschedule */ |
683 |
comm_setselect(fd, COMM_SELECT_WRITE, comm_connect_tryconnect, |
684 |
NULL, 0); |
685 |
else |
686 |
/* Error? Fail with COMM_ERR_CONNECT */ |
687 |
comm_connect_callback(fd, COMM_ERR_CONNECT); |
688 |
return; |
689 |
} |
690 |
|
691 |
/* If we get here, we've suceeded, so call with COMM_OK */ |
692 |
comm_connect_callback(fd, COMM_OK); |
693 |
} |
694 |
|
695 |
/* |
696 |
* comm_errorstr() - return an error string for the given error condition |
697 |
*/ |
698 |
const char * |
699 |
comm_errstr(int error) |
700 |
{ |
701 |
if (error < 0 || error >= COMM_ERR_MAX) |
702 |
return "Invalid error number!"; |
703 |
return comm_err_str[error]; |
704 |
} |
705 |
|
706 |
/* |
707 |
* comm_open() - open a socket |
708 |
* |
709 |
* This is a highly highly cut down version of squid's comm_open() which |
710 |
* for the most part emulates socket(), *EXCEPT* it fails if we're about |
711 |
* to run out of file descriptors. |
712 |
*/ |
713 |
int |
714 |
comm_open(fde_t *F, int family, int sock_type, int proto, const char *note) |
715 |
{ |
716 |
int fd; |
717 |
|
718 |
/* First, make sure we aren't going to run out of file descriptors */ |
719 |
if (number_fd >= hard_fdlimit) |
720 |
{ |
721 |
errno = ENFILE; |
722 |
return -1; |
723 |
} |
724 |
|
725 |
/* |
726 |
* Next, we try to open the socket. We *should* drop the reserved FD |
727 |
* limit if/when we get an error, but we can deal with that later. |
728 |
* XXX !!! -- adrian |
729 |
*/ |
730 |
fd = socket(family, sock_type, proto); |
731 |
if (fd < 0) |
732 |
{ |
733 |
#ifdef _WIN32 |
734 |
errno = WSAGetLastError(); |
735 |
#endif |
736 |
return -1; /* errno will be passed through, yay.. */ |
737 |
} |
738 |
|
739 |
execute_callback(setup_socket_cb, fd); |
740 |
|
741 |
/* update things in our fd tracking */ |
742 |
fd_open(F, fd, 1, note); |
743 |
return 0; |
744 |
} |
745 |
|
746 |
/* |
747 |
* comm_accept() - accept an incoming connection |
748 |
* |
749 |
* This is a simple wrapper for accept() which enforces FD limits like |
750 |
* comm_open() does. Returned fd must be either closed or tagged with |
751 |
* fd_open (this function no longer does it). |
752 |
*/ |
753 |
int |
754 |
comm_accept(struct Listener *lptr, struct irc_ssaddr *pn) |
755 |
{ |
756 |
int newfd; |
757 |
socklen_t addrlen = sizeof(struct irc_ssaddr); |
758 |
|
759 |
if (number_fd >= hard_fdlimit) |
760 |
{ |
761 |
errno = ENFILE; |
762 |
return -1; |
763 |
} |
764 |
|
765 |
/* |
766 |
* Next, do the accept(). if we get an error, we should drop the |
767 |
* reserved fd limit, but we can deal with that when comm_open() |
768 |
* also does it. XXX -- adrian |
769 |
*/ |
770 |
newfd = accept(lptr->fd.fd, (struct sockaddr *)pn, (socklen_t *)&addrlen); |
771 |
if (newfd < 0) |
772 |
{ |
773 |
#ifdef _WIN32 |
774 |
errno = WSAGetLastError(); |
775 |
#endif |
776 |
return -1; |
777 |
} |
778 |
|
779 |
#ifdef IPV6 |
780 |
remove_ipv6_mapping(pn); |
781 |
#else |
782 |
pn->ss_len = addrlen; |
783 |
#endif |
784 |
|
785 |
execute_callback(setup_socket_cb, newfd); |
786 |
|
787 |
/* .. and return */ |
788 |
return newfd; |
789 |
} |
790 |
|
791 |
/* |
792 |
* remove_ipv6_mapping() - Removes IPv4-In-IPv6 mapping from an address |
793 |
* This function should really inspect the struct itself rather than relying |
794 |
* on inet_pton and inet_ntop. OSes with IPv6 mapping listening on both |
795 |
* AF_INET and AF_INET6 map AF_INET connections inside AF_INET6 structures |
796 |
* |
797 |
*/ |
798 |
#ifdef IPV6 |
799 |
void |
800 |
remove_ipv6_mapping(struct irc_ssaddr *addr) |
801 |
{ |
802 |
if (addr->ss.ss_family == AF_INET6) |
803 |
{ |
804 |
struct sockaddr_in6 *v6; |
805 |
|
806 |
v6 = (struct sockaddr_in6*)addr; |
807 |
if (IN6_IS_ADDR_V4MAPPED(&v6->sin6_addr)) |
808 |
{ |
809 |
char v4ip[HOSTIPLEN]; |
810 |
struct sockaddr_in *v4 = (struct sockaddr_in*)addr; |
811 |
inetntop(AF_INET6, &v6->sin6_addr, v4ip, HOSTIPLEN); |
812 |
inet_pton(AF_INET, v4ip, &v4->sin_addr); |
813 |
addr->ss.ss_family = AF_INET; |
814 |
addr->ss_len = sizeof(struct sockaddr_in); |
815 |
} |
816 |
else |
817 |
addr->ss_len = sizeof(struct sockaddr_in6); |
818 |
} |
819 |
else |
820 |
addr->ss_len = sizeof(struct sockaddr_in); |
821 |
} |
822 |
#endif |