/src/s_bsd.c
C | 834 lines | 498 code | 91 blank | 245 comment | 71 complexity | e2aadebee1d7be73151cef71c8c9434b MD5 | raw file
Possible License(s): GPL-2.0, BSD-3-Clause
- /*
- * ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
- * s_bsd.c: Network functions.
- *
- * Copyright (C) 2002 by the past and present ircd coders, and others.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
- * USA
- *
- * $Id: s_bsd.c 465 2006-12-28 02:31:10Z jon $
- */
- #include "stdinc.h"
- #ifndef _WIN32
- #include <netinet/in_systm.h>
- #include <netinet/ip.h>
- #include <netinet/tcp.h>
- #endif
- #include "fdlist.h"
- #include "s_bsd.h"
- #include "client.h"
- #include "common.h"
- #include "dbuf.h"
- #include "event.h"
- #include "irc_string.h"
- #include "irc_getnameinfo.h"
- #include "irc_getaddrinfo.h"
- #include "ircd.h"
- #include "list.h"
- #include "listener.h"
- #include "numeric.h"
- #include "packet.h"
- #include "irc_res.h"
- #include "inet_misc.h"
- #include "restart.h"
- #include "s_auth.h"
- #include "s_conf.h"
- #include "s_log.h"
- #include "s_serv.h"
- #include "s_stats.h"
- #include "send.h"
- #include "memory.h"
- #include "s_user.h"
- #include "hook.h"
- static const char *comm_err_str[] = { "Comm OK", "Error during bind()",
- "Error during DNS lookup", "connect timeout", "Error during connect()",
- "Comm Error"
- };
- struct Callback *setup_socket_cb = NULL;
- static void comm_connect_callback(fde_t * fd, int status);
- static PF comm_connect_timeout;
- static void comm_connect_dns_callback(void *vptr, struct DNSReply *reply);
- static PF comm_connect_tryconnect;
- extern void init_netio(void);
- /* check_can_use_v6()
- * Check if the system can open AF_INET6 sockets
- */
- void
- check_can_use_v6(void)
- {
- #ifdef IPV6
- int v6;
- if((v6 = socket(AF_INET6, SOCK_STREAM, 0)) < 0)
- ServerInfo.can_use_v6 = 0;
- else
- {
- ServerInfo.can_use_v6 = 1;
- #ifdef _WIN32
- closesocket(v6);
- #else
- close(v6);
- #endif
- }
- #else
- ServerInfo.can_use_v6 = 0;
- #endif
- }
- /* get_sockerr - get the error value from the socket or the current errno
- *
- * Get the *real* error from the socket (well try to anyway..).
- * This may only work when SO_DEBUG is enabled but its worth the
- * gamble anyway.
- */
- int
- get_sockerr(int fd)
- {
- #ifndef _WIN32
- int errtmp = errno;
- #else
- int errtmp = WSAGetLastError();
- #endif
- #ifdef SO_ERROR
- int err = 0;
- socklen_t len = sizeof(err);
- if(-1 < fd && !getsockopt(fd, SOL_SOCKET, SO_ERROR, (char *) &err, (socklen_t *) & len))
- {
- if(err)
- errtmp = err;
- }
- errno = errtmp;
- #endif
- return errtmp;
- }
- /*
- * report_error - report an error from an errno.
- * Record error to log and also send a copy to all *LOCAL* opers online.
- *
- * text is a *format* string for outputing error. It must
- * contain only two '%s', the first will be replaced
- * by the sockhost from the client_p, and the latter will
- * be taken from sys_errlist[errno].
- *
- * client_p if not NULL, is the *LOCAL* client associated with
- * the error.
- *
- * Cannot use perror() within daemon. stderr is closed in
- * ircd and cannot be used. And, worse yet, it might have
- * been reassigned to a normal connection...
- *
- * Actually stderr is still there IFF ircd was run with -s --Rodder
- */
- void
- report_error(int level, const char *text, const char *who, int error)
- {
- who = (who) ? who : "";
- sendto_realops_flags(UMODE_DEBUG, level, text, who, strerror(error));
- log_oper_action(LOG_IOERR_TYPE, NULL, "%s %s %s\n", who, text, strerror(error));
- ilog(L_ERROR, text, who, strerror(error));
- }
- /*
- * setup_socket()
- *
- * Set the socket non-blocking, and other wonderful bits.
- */
- static void *
- setup_socket(va_list args)
- {
- int fd = va_arg(args, int);
- int opt = 1;
- setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char *) &opt, sizeof(opt));
- #ifdef IPTOS_LOWDELAY
- opt = IPTOS_LOWDELAY;
- setsockopt(fd, IPPROTO_IP, IP_TOS, (char *) &opt, sizeof(opt));
- #endif
- #ifndef _WIN32
- fcntl(fd, F_SETFL, fcntl(fd, F_GETFL, 0) | O_NONBLOCK);
- #endif
- return NULL;
- }
- /*
- * init_comm()
- *
- * Initializes comm subsystem.
- */
- void
- init_comm(void)
- {
- setup_socket_cb = register_callback("setup_socket", setup_socket);
- init_netio();
- }
- /*
- * close_connection
- * Close the physical connection. This function must make
- * MyConnect(client_p) == FALSE, and set client_p->from == NULL.
- */
- void
- close_connection(struct Client *client_p)
- {
- struct ConfItem *conf;
- struct AccessItem *aconf;
- struct ClassItem *aclass;
- assert(NULL != client_p);
- if(!IsDead(client_p))
- {
- /* attempt to flush any pending dbufs. Evil, but .. -- adrian */
- /* there is still a chance that we might send data to this socket
- * even if it is marked as blocked (COMM_SELECT_READ handler is called
- * before COMM_SELECT_WRITE). Let's try, nothing to lose.. -adx
- */
- ClearSendqBlocked(client_p);
- send_queued_write(client_p);
- }
- if(IsServer(client_p))
- {
- ServerStats->is_sv++;
- ServerStats->is_sbs += client_p->localClient->send.bytes;
- ServerStats->is_sbr += client_p->localClient->recv.bytes;
- ServerStats->is_sti += CurrentTime - client_p->firsttime;
- /* XXX Does this even make any sense at all anymore?
- * scheduling a 'quick' reconnect could cause a pile of
- * nick collides under TSora protocol... -db
- */
- /*
- * If the connection has been up for a long amount of time, schedule
- * a 'quick' reconnect, else reset the next-connect cycle.
- */
- if((conf = find_conf_exact(SERVER_TYPE,
- client_p->name, client_p->username, client_p->host)))
- {
- /*
- * Reschedule a faster reconnect, if this was a automatically
- * connected configuration entry. (Note that if we have had
- * a rehash in between, the status has been changed to
- * CONF_ILLEGAL). But only do this if it was a "good" link.
- */
- aconf = (struct AccessItem *) map_to_conf(conf);
- aclass = (struct ClassItem *) map_to_conf(aconf->class_ptr);
- aconf->hold = time(NULL);
- aconf->hold += (aconf->hold - client_p->since > HANGONGOODLINK) ?
- HANGONRETRYDELAY : ConFreq(aclass);
- if(nextconnect > aconf->hold)
- nextconnect = aconf->hold;
- }
- }
- else if(IsClient(client_p))
- {
- ServerStats->is_cl++;
- ServerStats->is_cbs += client_p->localClient->send.bytes;
- ServerStats->is_cbr += client_p->localClient->recv.bytes;
- ServerStats->is_cti += CurrentTime - client_p->firsttime;
- }
- else
- ServerStats->is_ni++;
- #ifdef HAVE_LIBCRYPTO
- if(client_p->localClient->fd.ssl)
- {
- SSL_set_shutdown(client_p->localClient->fd.ssl, SSL_RECEIVED_SHUTDOWN);
- if(!SSL_shutdown(client_p->localClient->fd.ssl))
- SSL_shutdown(client_p->localClient->fd.ssl);
- }
- #endif
- if(client_p->localClient->fd.flags.open)
- fd_close(&client_p->localClient->fd);
- if(HasServlink(client_p))
- {
- if(client_p->localClient->ctrlfd.flags.open)
- fd_close(&client_p->localClient->ctrlfd);
- }
- dbuf_clear(&client_p->localClient->buf_sendq);
- dbuf_clear(&client_p->localClient->buf_recvq);
- MyFree(client_p->localClient->passwd);
- detach_conf(client_p, CONF_TYPE);
- client_p->from = NULL; /* ...this should catch them! >:) --msa */
- }
- #ifdef HAVE_LIBCRYPTO
- /*
- * ssl_handshake - let OpenSSL initialize the protocol. Register for
- * read/write events if necessary.
- */
- static void
- ssl_handshake(int fd, struct Client *client_p)
- {
- int ret = SSL_accept(client_p->localClient->fd.ssl);
- X509 *cert;
- if ((cert = SSL_get_peer_certificate(client_p->localClient->fd.ssl)) != NULL)
- {
- int res = SSL_get_verify_result(client_p->localClient->fd.ssl);
- if (res == X509_V_OK || res == X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN ||
- res == X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE ||
- res == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT)
- {
- /* The client sent a certificate which verified OK */
- memcpy(client_p->certfp, cert->sha1_hash, sizeof(client_p->certfp));
- }
- else
- {
- ilog(L_WARN, "Client %s!%s@%s gave bad SSL client certificate: %d",
- client_p->name, client_p->username, client_p->host, res);
- }
- }
- if (ret <= 0)
- switch (SSL_get_error(client_p->localClient->fd.ssl, ret))
- {
- case SSL_ERROR_WANT_WRITE:
- comm_setselect(&client_p->localClient->fd, COMM_SELECT_WRITE,
- (PF *) ssl_handshake, client_p, 0);
- return;
- case SSL_ERROR_WANT_READ:
- comm_setselect(&client_p->localClient->fd, COMM_SELECT_READ,
- (PF *) ssl_handshake, client_p, 0);
- return;
- default:
- exit_client(client_p, client_p, "Error during SSL handshake");
- return;
- }
- execute_callback(auth_cb, client_p);
- }
- #endif
- /*
- * add_connection - creates a client which has just connected to us on
- * the given fd. The sockhost field is initialized with the ip# of the host.
- * An unique id is calculated now, in case it is needed for auth.
- * The client is sent to the auth module for verification, and not put in
- * any client list yet.
- */
- void
- add_connection(struct Listener *listener, struct irc_ssaddr *irn, int fd)
- {
- struct Client *new_client;
- assert(NULL != listener);
- new_client = make_client(NULL);
- fd_open(&new_client->localClient->fd, fd, 1,
- (listener->flags & LISTENER_SSL) ?
- "Incoming SSL connection" : "Incoming connection");
- /*
- * copy address to 'sockhost' as a string, copy it to host too
- * so we have something valid to put into error messages...
- */
- memcpy(&new_client->localClient->ip, irn, sizeof(struct irc_ssaddr));
- irc_getnameinfo((struct sockaddr *) &new_client->localClient->ip,
- new_client->localClient->ip.ss_len, new_client->sockhost,
- HOSTIPLEN, NULL, 0, NI_NUMERICHOST);
- new_client->localClient->aftype = new_client->localClient->ip.ss.ss_family;
- #ifdef IPV6
- if(new_client->sockhost[0] == ':')
- strlcat(new_client->host, "0", HOSTLEN + 1);
- if(new_client->localClient->aftype == AF_INET6 && ConfigFileEntry.dot_in_ip6_addr == 1)
- {
- strlcat(new_client->host, new_client->sockhost, HOSTLEN + 1);
- strlcat(new_client->host, ".", HOSTLEN + 1);
- }
- else
- #endif
- strlcat(new_client->host, new_client->sockhost, HOSTLEN + 1);
- strlcat(new_client->realhost, new_client->host, HOSTLEN + 1);
- new_client->connect_id = ++connect_id;
- new_client->localClient->listener = listener;
- ++listener->ref_count;
- #ifdef HAVE_LIBCRYPTO
- if(listener->flags & LISTENER_SSL)
- {
- if((new_client->localClient->fd.ssl = SSL_new(ServerInfo.ctx)) == NULL)
- {
- ilog(L_CRIT, "SSL_new() ERROR! -- %s",
- ERR_error_string(ERR_get_error(), NULL));
- SetDead(new_client);
- exit_client(new_client, new_client, "SSL_new failed");
- return;
- }
- SSL_set_fd(new_client->localClient->fd.ssl, fd);
- ssl_handshake(0, new_client);
- }
- else
- #endif
- execute_callback(auth_cb, new_client);
- }
- /*
- * stolen from squid - its a neat (but overused! :) routine which we
- * can use to see whether we can ignore this errno or not. It is
- * generally useful for non-blocking network IO related errnos.
- * -- adrian
- */
- int
- ignoreErrno(int ierrno)
- {
- switch (ierrno)
- {
- case EINPROGRESS:
- case EWOULDBLOCK:
- #if EAGAIN != EWOULDBLOCK
- case EAGAIN:
- #endif
- case EALREADY:
- case EINTR:
- #ifdef ERESTART
- case ERESTART:
- #endif
- return 1;
- default:
- return 0;
- }
- }
- /*
- * comm_settimeout() - set the socket timeout
- *
- * Set the timeout for the fd
- */
- void
- comm_settimeout(fde_t * fd, time_t timeout, PF * callback, void *cbdata)
- {
- assert(fd->flags.open);
- fd->timeout = CurrentTime + (timeout / 1000);
- fd->timeout_handler = callback;
- fd->timeout_data = cbdata;
- }
- /*
- * comm_setflush() - set a flush function
- *
- * A flush function is simply a function called if found during
- * comm_timeouts(). Its basically a second timeout, except in this case
- * I'm too lazy to implement multiple timeout functions! :-)
- * its kinda nice to have it separate, since this is designed for
- * flush functions, and when comm_close() is implemented correctly
- * with close functions, we _actually_ don't call comm_close() here ..
- * -- originally Adrian's notes
- * comm_close() is replaced with fd_close() in fdlist.c
- */
- void
- comm_setflush(fde_t * fd, time_t timeout, PF * callback, void *cbdata)
- {
- assert(fd->flags.open);
- fd->flush_timeout = CurrentTime + (timeout / 1000);
- fd->flush_handler = callback;
- fd->flush_data = cbdata;
- }
- /*
- * comm_checktimeouts() - check the socket timeouts
- *
- * All this routine does is call the given callback/cbdata, without closing
- * down the file descriptor. When close handlers have been implemented,
- * this will happen.
- */
- void
- comm_checktimeouts(void *notused)
- {
- int i;
- fde_t *F;
- PF *hdl;
- void *data;
- for(i = 0; i < FD_HASH_SIZE; i++)
- for(F = fd_hash[i]; F != NULL; F = fd_next_in_loop)
- {
- assert(F->flags.open);
- fd_next_in_loop = F->hnext;
- /* check flush functions */
- if(F->flush_handler && F->flush_timeout > 0 &&
- F->flush_timeout < CurrentTime)
- {
- hdl = F->flush_handler;
- data = F->flush_data;
- comm_setflush(F, 0, NULL, NULL);
- hdl(F, data);
- }
- /* check timeouts */
- if(F->timeout_handler && F->timeout > 0 && F->timeout < CurrentTime)
- {
- /* Call timeout handler */
- hdl = F->timeout_handler;
- data = F->timeout_data;
- comm_settimeout(F, 0, NULL, NULL);
- hdl(F, data);
- }
- }
- }
- /*
- * void comm_connect_tcp(int fd, const char *host, unsigned short port,
- * struct sockaddr *clocal, int socklen,
- * CNCB *callback, void *data, int aftype, int timeout)
- * Input: An fd to connect with, a host and port to connect to,
- * a local sockaddr to connect from + length(or NULL to use the
- * default), a callback, the data to pass into the callback, the
- * address family.
- * Output: None.
- * Side-effects: A non-blocking connection to the host is started, and
- * if necessary, set up for selection. The callback given
- * may be called now, or it may be called later.
- */
- void
- comm_connect_tcp(fde_t * fd, const char *host, unsigned short port,
- struct sockaddr *clocal, int socklen, CNCB * callback,
- void *data, int aftype, int timeout)
- {
- struct addrinfo hints, *res;
- char portname[PORTNAMELEN + 1];
- assert(callback);
- fd->connect.callback = callback;
- fd->connect.data = data;
- fd->connect.hostaddr.ss.ss_family = aftype;
- fd->connect.hostaddr.ss_port = htons(port);
- /* Note that we're using a passed sockaddr here. This is because
- * generally you'll be bind()ing to a sockaddr grabbed from
- * getsockname(), so this makes things easier.
- * XXX If NULL is passed as local, we should later on bind() to the
- * virtual host IP, for completeness.
- * -- adrian
- */
- if((clocal != NULL) && (bind(fd->fd, clocal, socklen) < 0))
- {
- /* Failure, call the callback with COMM_ERR_BIND */
- comm_connect_callback(fd, COMM_ERR_BIND);
- /* ... and quit */
- return;
- }
- /* Next, if we have been given an IP, get the addr and skip the
- * DNS check (and head direct to comm_connect_tryconnect().
- */
- memset(&hints, 0, sizeof(hints));
- hints.ai_family = AF_UNSPEC;
- hints.ai_socktype = SOCK_STREAM;
- hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST;
- snprintf(portname, PORTNAMELEN, "%d", port);
- if(irc_getaddrinfo(host, portname, &hints, &res))
- {
- /* Send the DNS request, for the next level */
- fd->dns_query = MyMalloc(sizeof(struct DNSQuery));
- fd->dns_query->ptr = fd;
- fd->dns_query->callback = comm_connect_dns_callback;
- gethost_byname(host, fd->dns_query);
- }
- else
- {
- /* We have a valid IP, so we just call tryconnect */
- /* Make sure we actually set the timeout here .. */
- assert(res != NULL);
- memcpy(&fd->connect.hostaddr, res->ai_addr, res->ai_addrlen);
- fd->connect.hostaddr.ss_len = res->ai_addrlen;
- fd->connect.hostaddr.ss.ss_family = res->ai_family;
- irc_freeaddrinfo(res);
- comm_settimeout(fd, timeout * 1000, comm_connect_timeout, NULL);
- comm_connect_tryconnect(fd, NULL);
- }
- }
- /*
- * comm_connect_callback() - call the callback, and continue with life
- */
- static void
- comm_connect_callback(fde_t * fd, int status)
- {
- CNCB *hdl;
- /* This check is gross..but probably necessary */
- if(fd->connect.callback == NULL)
- return;
- /* Clear the connect flag + handler */
- hdl = fd->connect.callback;
- fd->connect.callback = NULL;
- /* Clear the timeout handler */
- comm_settimeout(fd, 0, NULL, NULL);
- /* Call the handler */
- hdl(fd, status, fd->connect.data);
- }
- /*
- * comm_connect_timeout() - this gets called when the socket connection
- * times out. This *only* can be called once connect() is initially
- * called ..
- */
- static void
- comm_connect_timeout(fde_t * fd, void *notused)
- {
- /* error! */
- comm_connect_callback(fd, COMM_ERR_TIMEOUT);
- }
- /*
- * comm_connect_dns_callback() - called at the completion of the DNS request
- *
- * The DNS request has completed, so if we've got an error, return it,
- * otherwise we initiate the connect()
- */
- static void
- comm_connect_dns_callback(void *vptr, struct DNSReply *reply)
- {
- fde_t *F = vptr;
- if(reply == NULL)
- {
- MyFree(F->dns_query);
- F->dns_query = NULL;
- comm_connect_callback(F, COMM_ERR_DNS);
- return;
- }
- /* No error, set a 10 second timeout */
- comm_settimeout(F, 30 * 1000, comm_connect_timeout, NULL);
- /* Copy over the DNS reply info so we can use it in the connect() */
- /*
- * Note we don't fudge the refcount here, because we aren't keeping
- * the DNS record around, and the DNS cache is gone anyway..
- * -- adrian
- */
- memcpy(&F->connect.hostaddr, &reply->addr, reply->addr.ss_len);
- /* The cast is hacky, but safe - port offset is same on v4 and v6 */
- ((struct sockaddr_in *) &F->connect.hostaddr)->sin_port = F->connect.hostaddr.ss_port;
- F->connect.hostaddr.ss_len = reply->addr.ss_len;
- /* Now, call the tryconnect() routine to try a connect() */
- MyFree(F->dns_query);
- F->dns_query = NULL;
- comm_connect_tryconnect(F, NULL);
- }
- /* static void comm_connect_tryconnect(int fd, void *notused)
- * Input: The fd, the handler data(unused).
- * Output: None.
- * Side-effects: Try and connect with pending connect data for the FD. If
- * we succeed or get a fatal error, call the callback.
- * Otherwise, it is still blocking or something, so register
- * to select for a write event on this FD.
- */
- static void
- comm_connect_tryconnect(fde_t * fd, void *notused)
- {
- int retval;
- /* This check is needed or re-entrant s_bsd_* like sigio break it. */
- if(fd->connect.callback == NULL)
- return;
- /* Try the connect() */
- retval = connect(fd->fd, (struct sockaddr *) &fd->connect.hostaddr,
- fd->connect.hostaddr.ss_len);
- /* Error? */
- if(retval < 0)
- {
- #ifdef _WIN32
- errno = WSAGetLastError();
- #endif
- /*
- * If we get EISCONN, then we've already connect()ed the socket,
- * which is a good thing.
- * -- adrian
- */
- if(errno == EISCONN)
- comm_connect_callback(fd, COMM_OK);
- else if(ignoreErrno(errno))
- /* Ignore error? Reschedule */
- comm_setselect(fd, COMM_SELECT_WRITE, comm_connect_tryconnect, NULL, 0);
- else
- /* Error? Fail with COMM_ERR_CONNECT */
- comm_connect_callback(fd, COMM_ERR_CONNECT);
- return;
- }
- /* If we get here, we've suceeded, so call with COMM_OK */
- comm_connect_callback(fd, COMM_OK);
- }
- /*
- * comm_errorstr() - return an error string for the given error condition
- */
- const char *
- comm_errstr(int error)
- {
- if(error < 0 || error >= COMM_ERR_MAX)
- return "Invalid error number!";
- return comm_err_str[error];
- }
- /*
- * comm_open() - open a socket
- *
- * This is a highly highly cut down version of squid's comm_open() which
- * for the most part emulates socket(), *EXCEPT* it fails if we're about
- * to run out of file descriptors.
- */
- int
- comm_open(fde_t * F, int family, int sock_type, int proto, const char *note)
- {
- int fd;
- /* First, make sure we aren't going to run out of file descriptors */
- if(number_fd >= hard_fdlimit)
- {
- errno = ENFILE;
- return -1;
- }
- /*
- * Next, we try to open the socket. We *should* drop the reserved FD
- * limit if/when we get an error, but we can deal with that later.
- * XXX !!! -- adrian
- */
- fd = socket(family, sock_type, proto);
- if(fd < 0)
- {
- #ifdef _WIN32
- errno = WSAGetLastError();
- #endif
- return -1; /* errno will be passed through, yay.. */
- }
- execute_callback(setup_socket_cb, fd);
- /* update things in our fd tracking */
- fd_open(F, fd, 1, note);
- return 0;
- }
- /*
- * comm_accept() - accept an incoming connection
- *
- * This is a simple wrapper for accept() which enforces FD limits like
- * comm_open() does. Returned fd must be either closed or tagged with
- * fd_open (this function no longer does it).
- */
- int
- comm_accept(struct Listener *lptr, struct irc_ssaddr *pn)
- {
- int newfd;
- socklen_t addrlen = sizeof(struct irc_ssaddr);
- if(number_fd >= hard_fdlimit)
- {
- errno = ENFILE;
- return -1;
- }
- /*
- * Next, do the accept(). if we get an error, we should drop the
- * reserved fd limit, but we can deal with that when comm_open()
- * also does it. XXX -- adrian
- */
- newfd = accept(lptr->fd.fd, (struct sockaddr *) pn, (socklen_t *) & addrlen);
- if(newfd < 0)
- {
- #ifdef _WIN32
- errno = WSAGetLastError();
- #endif
- return -1;
- }
- #ifdef IPV6
- remove_ipv6_mapping(pn);
- #else
- pn->ss_len = addrlen;
- #endif
- execute_callback(setup_socket_cb, newfd);
- /* .. and return */
- return newfd;
- }
- /*
- * remove_ipv6_mapping() - Removes IPv4-In-IPv6 mapping from an address
- * This function should really inspect the struct itself rather than relying
- * on inet_pton and inet_ntop. OSes with IPv6 mapping listening on both
- * AF_INET and AF_INET6 map AF_INET connections inside AF_INET6 structures
- *
- */
- #ifdef IPV6
- void
- remove_ipv6_mapping(struct irc_ssaddr *addr)
- {
- if(addr->ss.ss_family == AF_INET6)
- {
- struct sockaddr_in6 *v6;
- v6 = (struct sockaddr_in6 *) addr;
- if(IN6_IS_ADDR_V4MAPPED(&v6->sin6_addr))
- {
- char v4ip[HOSTIPLEN];
- struct sockaddr_in *v4 = (struct sockaddr_in *) addr;
- inetntop(AF_INET6, &v6->sin6_addr, v4ip, HOSTIPLEN);
- inet_pton(AF_INET, v4ip, &v4->sin_addr);
- addr->ss.ss_family = AF_INET;
- addr->ss_len = sizeof(struct sockaddr_in);
- }
- else
- addr->ss_len = sizeof(struct sockaddr_in6);
- }
- else
- addr->ss_len = sizeof(struct sockaddr_in);
- }
- #endif