/*************************************************************************** * _ _ ____ _ * Project ___| | | | _ \| | * / __| | | | |_) | | * | (__| |_| | _ <| |___ * \___|\___/|_| \_\_____| * * Copyright (C) 1998 - 2004, Daniel Stenberg, , et al. * * This software is licensed as described in the file COPYING, which * you should have received as part of this distribution. The terms * are also available at http://curl.haxx.se/docs/copyright.html. * * 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 COPYING file. * * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY * KIND, either express or implied. * * $Id$ ***************************************************************************/ #include "setup.h" #include #include #define _REENTRANT #if defined(WIN32) && !defined(__GNUC__) || defined(__MINGW32__) #include #else #ifdef HAVE_SYS_TYPES_H #include #endif #ifdef HAVE_SYS_SOCKET_H #include #endif #ifdef HAVE_NETINET_IN_H #include #endif #ifdef HAVE_NETDB_H #include #endif #ifdef HAVE_ARPA_INET_H #include #endif #ifdef HAVE_STDLIB_H #include /* required for free() prototypes */ #endif #ifdef HAVE_UNISTD_H #include /* for the close() proto */ #endif #ifdef VMS #include #include #include #endif #endif #ifdef HAVE_SETJMP_H #include #endif #ifdef WIN32 #include #endif #if (defined(NETWARE) && defined(__NOVELL_LIBC__)) #undef in_addr_t #define in_addr_t unsigned long #endif #include "urldata.h" #include "sendf.h" #include "hostip.h" #include "hash.h" #include "share.h" #include "strerror.h" #include "url.h" #define _MPRINTF_REPLACE /* use our functions only */ #include #include "inet_ntop.h" #include "memory.h" /* The last #include file should be: */ #include "memdebug.h" /*********************************************************************** * Only for Windows threaded name resolves builds **********************************************************************/ #ifdef CURLRES_THREADED /* This function is used to init a threaded resolve */ static bool init_resolve_thread(struct connectdata *conn, const char *hostname, int port, const Curl_addrinfo *hints); #ifdef CURLRES_IPV4 #define THREAD_FUNC gethostbyname_thread #define THREAD_NAME "gethostbyname_thread" #else #define THREAD_FUNC getaddrinfo_thread #define THREAD_NAME "getaddrinfo_thread" #endif #if defined(DEBUG_THREADING_GETHOSTBYNAME) || \ defined(DEBUG_THREADING_GETADDRINFO) /* If this is defined, provide tracing */ #define TRACE(args) \ do { trace_it("%u: ", __LINE__); trace_it args; } while (0) static void trace_it (const char *fmt, ...) { static int do_trace = -1; va_list args; if (do_trace == -1) { const char *env = getenv("CURL_TRACE"); do_trace = (env && atoi(env) > 0); } if (!do_trace) return; va_start (args, fmt); vfprintf (stderr, fmt, args); fflush (stderr); va_end (args); } #else #define TRACE(x) #endif #ifdef DEBUG_THREADING_GETADDRINFO static void dump_addrinfo (struct connectdata *conn, const struct addrinfo *ai) { TRACE(("dump_addrinfo:\n")); for ( ; ai; ai = ai->ai_next) { char buf [INET6_ADDRSTRLEN]; trace_it(" fam %2d, CNAME %s, ", ai->ai_family, ai->ai_canonname ? ai->ai_canonname : ""); if (Curl_printable_address(ai, buf, sizeof(buf))) trace_it("%s\n", buf); else trace_it("failed; %s\n", Curl_strerror(conn,WSAGetLastError())); } } #endif struct thread_data { HANDLE thread_hnd; unsigned thread_id; DWORD thread_status; curl_socket_t dummy_sock; /* dummy for Curl_fdset() */ FILE *stderr_file; #ifdef CURLRES_IPV6 struct addrinfo hints; #endif }; #if defined(CURLRES_IPV4) /* * gethostbyname_thread() resolves a name, calls the Curl_addrinfo_callback * and then exits. * * For builds without ARES/ENABLE_IPV6, create a resolver thread and wait on * it. */ static unsigned __stdcall gethostbyname_thread (void *arg) { struct connectdata *conn = (struct connectdata*) arg; struct thread_data *td = (struct thread_data*) conn->async.os_specific; struct hostent *he; int rc; /* Sharing the same _iob[] element with our parent thread should * hopefully make printouts synchronised. I'm not sure it works * with a static runtime lib (MSVC's libc.lib). */ *stderr = *td->stderr_file; WSASetLastError (conn->async.status = NO_DATA); /* pending status */ he = gethostbyname (conn->async.hostname); if (he) { Curl_addrinfo_callback(conn, CURL_ASYNC_SUCCESS, he); rc = 1; } else { Curl_addrinfo_callback(conn, (int)WSAGetLastError(), NULL); rc = 0; } TRACE(("Winsock-error %d, addr %s\n", conn->async.status, he ? inet_ntoa(*(struct in_addr*)he->h_addr) : "unknown")); return (rc); /* An implicit _endthreadex() here */ } #elif defined(CURLRES_IPV6) /* * getaddrinfo_thread() resolves a name, calls Curl_addrinfo_callback and then * exits. * * For builds without ARES, but with ENABLE_IPV6, create a resolver thread * and wait on it. */ static unsigned __stdcall getaddrinfo_thread (void *arg) { struct connectdata *conn = (struct connectdata*) arg; struct thread_data *td = (struct thread_data*) conn->async.os_specific; struct addrinfo *res; char service [NI_MAXSERV]; int rc; *stderr = *td->stderr_file; itoa(conn->async.port, service, 10); WSASetLastError(conn->async.status = NO_DATA); /* pending status */ rc = getaddrinfo(conn->async.hostname, service, &td->hints, &res); if (rc == 0) { #ifdef DEBUG_THREADING_GETADDRINFO dump_addrinfo (conn, res); #endif Curl_addrinfo_callback(conn, CURL_ASYNC_SUCCESS, res); } else { Curl_addrinfo_callback(conn, (int)WSAGetLastError(), NULL); TRACE(("Winsock-error %d, no address\n", conn->async.status)); } return (rc); /* An implicit _endthreadex() here */ } #endif /* * destroy_thread_data() cleans up async resolver data. * Complementary of ares_destroy. */ static void destroy_thread_data (struct Curl_async *async) { if (async->hostname) free(async->hostname); if (async->os_specific) { curl_socket_t sock = ((const struct thread_data*)async->os_specific)->dummy_sock; if (sock != CURL_SOCKET_BAD) sclose(sock); free(async->os_specific); } async->hostname = NULL; async->os_specific = NULL; } /* * init_resolve_thread() starts a new thread that performs the actual * resolve. This function returns before the resolve is done. * * Returns FALSE in case of failure, otherwise TRUE. */ static bool init_resolve_thread (struct connectdata *conn, const char *hostname, int port, const Curl_addrinfo *hints) { struct thread_data *td = calloc(sizeof(*td), 1); if (!td) { SetLastError(ENOMEM); return FALSE; } Curl_safefree(conn->async.hostname); conn->async.hostname = strdup(hostname); if (!conn->async.hostname) { free(td); SetLastError(ENOMEM); return FALSE; } conn->async.port = port; conn->async.done = FALSE; conn->async.status = 0; conn->async.dns = NULL; conn->async.os_specific = (void*) td; td->dummy_sock = CURL_SOCKET_BAD; td->stderr_file = stderr; td->thread_hnd = (HANDLE) _beginthreadex(NULL, 0, THREAD_FUNC, conn, 0, &td->thread_id); #ifdef CURLRES_IPV6 curlassert(hints); td->hints = *hints; #else (void) hints; #endif if (!td->thread_hnd) { SetLastError(errno); TRACE(("_beginthreadex() failed; %s\n", Curl_strerror(conn,errno))); destroy_thread_data(&conn->async); return FALSE; } /* This socket is only to keep Curl_fdset() and select() happy; should never * become signalled for read/write since it's unbound but Windows needs * atleast 1 socket in select(). */ td->dummy_sock = socket(AF_INET, SOCK_DGRAM, 0); return TRUE; } /* * Curl_wait_for_resolv() waits for a resolve to finish. This function should * be avoided since using this risk getting the multi interface to "hang". * * If 'entry' is non-NULL, make it point to the resolved dns entry * * This is the version for resolves-in-a-thread. */ CURLcode Curl_wait_for_resolv(struct connectdata *conn, struct Curl_dns_entry **entry) { struct thread_data *td = (struct thread_data*) conn->async.os_specific; struct SessionHandle *data = conn->data; long timeout; DWORD status, ticks; CURLcode rc; curlassert (conn && td); /* now, see if there's a connect timeout or a regular timeout to use instead of the default one */ timeout = conn->data->set.connecttimeout ? conn->data->set.connecttimeout : conn->data->set.timeout ? conn->data->set.timeout : CURL_TIMEOUT_RESOLVE; /* default name resolve timeout */ ticks = GetTickCount(); status = WaitForSingleObject(td->thread_hnd, 1000UL*timeout); if (status == WAIT_OBJECT_0 || status == WAIT_ABANDONED) { /* Thread finished before timeout; propagate Winsock error to this thread. * 'conn->async.done = TRUE' is set in Curl_addrinfo_callback(). */ WSASetLastError(conn->async.status); GetExitCodeThread(td->thread_hnd, &td->thread_status); TRACE(("%s() status %lu, thread retval %lu, ", THREAD_NAME, status, td->thread_status)); } else { conn->async.done = TRUE; td->thread_status = (DWORD)-1; TRACE(("%s() timeout, ", THREAD_NAME)); } TRACE(("elapsed %lu ms\n", GetTickCount()-ticks)); CloseHandle(td->thread_hnd); if(entry) *entry = conn->async.dns; rc = CURLE_OK; if (!conn->async.dns) { /* a name was not resolved */ if (td->thread_status == (DWORD)-1 || conn->async.status == NO_DATA) { failf(data, "Resolving host timed out: %s", conn->host.name); rc = CURLE_OPERATION_TIMEDOUT; } else if(conn->async.done) { failf(data, "Could not resolve host: %s; %s", conn->host.name, Curl_strerror(conn,conn->async.status)); rc = CURLE_COULDNT_RESOLVE_HOST; } else rc = CURLE_OPERATION_TIMEDOUT; } destroy_thread_data(&conn->async); if(CURLE_OK != rc) /* close the connection, since we must not return failure from here without cleaning up this connection properly */ Curl_disconnect(conn); return (rc); } /* * Curl_is_resolved() is called repeatedly to check if a previous name resolve * request has completed. It should also make sure to time-out if the * operation seems to take too long. */ CURLcode Curl_is_resolved(struct connectdata *conn, struct Curl_dns_entry **entry) { *entry = NULL; if (conn->async.done) { /* we're done */ destroy_thread_data(&conn->async); if (!conn->async.dns) { TRACE(("Curl_is_resolved(): CURLE_COULDNT_RESOLVE_HOST\n")); return CURLE_COULDNT_RESOLVE_HOST; } *entry = conn->async.dns; TRACE(("resolved okay, dns %p\n", *entry)); } else TRACE(("not yet\n")); return CURLE_OK; } CURLcode Curl_fdset(struct connectdata *conn, fd_set *read_fd_set, fd_set *write_fd_set, int *max_fdp) { const struct thread_data *td = (const struct thread_data *) conn->async.os_specific; if (td && td->dummy_sock != CURL_SOCKET_BAD) { FD_SET(td->dummy_sock,write_fd_set); *max_fdp = td->dummy_sock; } (void) read_fd_set; return CURLE_OK; } #ifdef CURLRES_IPV4 /* * Curl_getaddrinfo() - for Windows threading without ENABLE_IPV6. */ Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn, char *hostname, int port, int *waitp) { struct hostent *h = NULL; struct SessionHandle *data = conn->data; in_addr_t in; *waitp = 0; /* don't wait, we act synchronously */ in = inet_addr(hostname); if (in != CURL_INADDR_NONE) /* This is a dotted IP address 123.123.123.123-style */ return Curl_ip2addr(in, hostname); /* fire up a new resolver thread! */ if (init_resolve_thread(conn, hostname, port, NULL)) { *waitp = TRUE; /* please wait for the response */ return NULL; } /* fall-back to blocking version */ infof(data, "init_resolve_thread() failed for %s; code %lu\n", hostname, GetLastError()); h = gethostbyname(hostname); if (!h) { infof(data, "gethostbyname(2) failed for %s:%d; %s\n", hostname, port, Curl_strerror(conn,WSAGetLastError())); return NULL; } return Curl_he2ai(h, port); } #endif /* CURLRES_IPV4 */ #ifdef CURLRES_IPV6 /* * Curl_getaddrinfo() - for Windows threading IPv6 enabled */ Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn, char *hostname, int port, int *waitp) { struct addrinfo hints, *res; int error; char sbuf[NI_MAXSERV]; curl_socket_t s; int pf; struct SessionHandle *data = conn->data; *waitp = FALSE; /* default to synch response */ /* see if we have an IPv6 stack */ s = socket(PF_INET6, SOCK_DGRAM, 0); if (s == CURL_SOCKET_BAD) { /* Some non-IPv6 stacks have been found to make very slow name resolves * when PF_UNSPEC is used, so thus we switch to a mere PF_INET lookup if * the stack seems to be a non-ipv6 one. */ pf = PF_INET; } else { /* This seems to be an IPv6-capable stack, use PF_UNSPEC for the widest * possible checks. And close the socket again. */ sclose(s); /* * Check if a more limited name resolve has been requested. */ switch(data->set.ip_version) { case CURL_IPRESOLVE_V4: pf = PF_INET; break; case CURL_IPRESOLVE_V6: pf = PF_INET6; break; default: pf = PF_UNSPEC; break; } } memset(&hints, 0, sizeof(hints)); hints.ai_family = pf; hints.ai_socktype = SOCK_STREAM; hints.ai_flags = AI_CANONNAME; itoa(port, sbuf, 10); /* fire up a new resolver thread! */ if (init_resolve_thread(conn, hostname, port, &hints)) { *waitp = TRUE; /* please wait for the response */ return NULL; } /* fall-back to blocking version */ infof(data, "init_resolve_thread() failed for %s; code %lu\n", hostname, GetLastError()); error = getaddrinfo(hostname, sbuf, &hints, &res); if (error) { infof(data, "getaddrinfo() failed for %s:%d; %s\n", hostname, port, Curl_strerror(conn,WSAGetLastError())); return NULL; } return res; } #endif /* CURLRES_IPV6 */ #endif /* CURLRES_THREADED */