/***************************************************************************** * _ _ ____ _ * Project ___| | | | _ \| | * / __| | | | |_) | | * | (__| |_| | _ <| |___ * \___|\___/|_| \_\_____| * * Copyright (C) 2001, Daniel Stenberg, , et al. * * In order to be useful for every potential user, curl and libcurl are * dual-licensed under the MPL and the MIT/X-derivate licenses. * * You may opt to use, copy, modify, merge, publish, distribute and/or sell * copies of the Software, and permit persons to whom the Software is * furnished to do so, under the terms of the MPL or the MIT/X-derivate * licenses. You may pick one of these licenses. * * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY * KIND, either express or implied. * * $Id$ *****************************************************************************/ #include "setup.h" #ifndef WIN32 /* headers for non-win32 */ #include #include #include #include #ifdef HAVE_UNISTD_H #include #endif #ifdef HAVE_NETDB_H #include #endif #ifdef HAVE_FCNTL_H #include #endif #ifdef HAVE_NETINET_IN_H #include #endif #endif #include #include #ifndef TRUE #define TRUE 1 #define FALSE 0 #endif #ifdef WIN32 #define HAVE_IOCTLSOCKET #include #include #define EINPROGRESS WSAEINPROGRESS #define EWOULDBLOCK WSAEWOULDBLOCK #endif #include "urldata.h" #include "sendf.h" /* The last #include file should be: */ #ifdef MALLOCDEBUG #include "memdebug.h" #endif /************************************************************************* * Curl_nonblock * * Description: * Set the socket to either blocking or non-blocking mode. */ static int nonblock(int socket, /* operate on this */ int nonblock /* TRUE or FALSE */) { #undef SETBLOCK #ifdef HAVE_O_NONBLOCK int flags; flags = fcntl(socket, F_GETFL, 0); if (TRUE == nonblock) return fcntl(socket, F_SETFL, flags | O_NONBLOCK); else return fcntl(socket, F_SETFL, flags & (~O_NONBLOCK)); #define SETBLOCK 1 #endif #ifdef HAVE_FIONBIO int flags; flags = nonblock; return ioctl(socket, FIONBIO, &flags); #define SETBLOCK 2 #endif #ifdef HAVE_IOCTLSOCKET int flags; flags = nonblock; return ioctlsocket(socket, FIONBIO, &flags); #define SETBLOCK 3 #endif #ifdef HAVE_IOCTLSOCKET_CASE return IoctlSocket(socket, FIONBIO, (long)nonblock); #define SETBLOCK 4 #endif #ifdef HAVE_DISABLED_NONBLOCKING return 0; /* returns success */ #define SETBLOCK 5 #endif #ifndef SETBLOCK #error "no non-blocking method was found/used/set" #endif } /* * Return 0 on fine connect, -1 on error and 1 on timeout. */ static int waitconnect(int sockfd, /* socket */ int timeout_msec) { fd_set fd; struct timeval interval; int rc; /* now select() until we get connect or timeout */ FD_ZERO(&fd); FD_SET(sockfd, &fd); interval.tv_sec = timeout_msec/1000; timeout_msec -= interval.tv_sec*1000; interval.tv_usec = timeout_msec*1000; rc = select(sockfd+1, NULL, &fd, NULL, &interval); if(-1 == rc) /* error, no connect here, try next */ return -1; else if(0 == rc) /* timeout, no connect today */ return 1; /* we have a connect! */ return 0; } /* * TCP connect to the given host with timeout, proxy or remote doesn't matter. * There might be more than one IP address to try out. Fill in the passed * pointer with the connected socket. */ CURLcode Curl_connecthost(struct connectdata *conn, long timeout_ms, Curl_addrinfo *remotehost, int port, int sockfd, /* input socket, or -1 if none */ int *socket) { struct SessionHandle *data = conn->data; int rc; struct timeval after; struct timeval before = Curl_tvnow(); #ifdef ENABLE_IPV6 struct addrinfo *ai; /* * Connecting with IPv6 support is so much easier and cleanly done */ port =0; /* we already have port in the 'remotehost' struct */ if(sockfd != -1) /* don't use any previous one, it might be of wrong type */ sclose(sockfd); sockfd = -1; /* none! */ for (ai = remotehost; ai; ai = ai->ai_next) { sockfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); if (sockfd < 0) continue; /* set socket non-blocking */ nonblock(sockfd, TRUE); rc = connect(sockfd, ai->ai_addr, ai->ai_addrlen); if(0 == rc) /* direct connect, awesome! */ break; /* asynchronous connect, wait for connect or timeout */ rc = waitconnect(sockfd, timeout_ms); if(0 != rc) { /* connect failed or timed out */ sclose(sockfd); sockfd = -1; /* get a new timeout for next attempt */ after = Curl_tvnow(); timeout_ms -= (long)(Curl_tvdiff(after, before)*1000); before = after; continue; } /* now disable the non-blocking mode again */ nonblock(sockfd, FALSE); break; } conn->ai = ai; if (sockfd < 0) { failf(data, strerror(errno)); return CURLE_COULDNT_CONNECT; } #else /* * Connecting with IPv4-only support */ int aliasindex; struct sockaddr_in serv_addr; if(-1 == sockfd) /* create an ordinary socket if none was provided */ sockfd = socket(AF_INET, SOCK_STREAM, 0); if(-1 == sockfd) return CURLE_COULDNT_CONNECT; /* big time error */ /* non-block socket */ nonblock(sockfd, TRUE); /* This is the loop that attempts to connect to all IP-addresses we know for the given host. One by one. */ for(rc=-1, aliasindex=0; rc && (struct in_addr *)remotehost->h_addr_list[aliasindex]; aliasindex++) { /* copy this particular name info to the conn struct as it might be used later in the krb4 "system" */ memset((char *) &serv_addr, '\0', sizeof(serv_addr)); memcpy((char *)&(serv_addr.sin_addr), (struct in_addr *)remotehost->h_addr_list[aliasindex], sizeof(struct in_addr)); serv_addr.sin_family = remotehost->h_addrtype; serv_addr.sin_port = htons(port); rc = connect(sockfd, (struct sockaddr *)&serv_addr, sizeof(serv_addr)); if(-1 == rc) { int error; #ifdef WIN32 error = (int)GetLastError(); #else error = errno; #endif switch (error) { case EINPROGRESS: case EWOULDBLOCK: #if defined(EAGAIN) && EAGAIN != EWOULDBLOCK /* On some platforms EAGAIN and EWOULDBLOCK are the * same value, and on others they are different, hence * the odd #if */ case EAGAIN: #endif /* asynchronous connect, wait for connect or timeout */ rc = waitconnect(sockfd, timeout_ms); break; default: /* unknown error, fallthrough and try another address! */ break; } } if(0 != rc) { /* get a new timeout for next attempt */ after = Curl_tvnow(); timeout_ms -= (long)(Curl_tvdiff(after, before)*1000); before = after; continue; /* try next address */ } else { /* copy this particular name info to the conn struct as it might be used later in the krb4 "system" */ memcpy((char *) &conn->serv_addr, &serv_addr, sizeof(conn->serv_addr)); } break; } if(-1 == rc) { /* no good connect was made */ sclose(sockfd); *socket = -1; failf(data, "Couldn't connect to (any) IP address"); return CURLE_COULDNT_CONNECT; } /* now disable the non-blocking mode again */ nonblock(sockfd, FALSE); #endif *socket = sockfd; /* pass this to our parent */ return CURLE_OK; }