diff options
Diffstat (limited to 'Utilities/cmcurl-7.19.0/lib/hostip.c')
| -rw-r--r-- | Utilities/cmcurl-7.19.0/lib/hostip.c | 748 |
1 files changed, 0 insertions, 748 deletions
diff --git a/Utilities/cmcurl-7.19.0/lib/hostip.c b/Utilities/cmcurl-7.19.0/lib/hostip.c deleted file mode 100644 index 4e0df25..0000000 --- a/Utilities/cmcurl-7.19.0/lib/hostip.c +++ /dev/null @@ -1,748 +0,0 @@ -/*************************************************************************** - * _ _ ____ _ - * Project ___| | | | _ \| | - * / __| | | | |_) | | - * | (__| |_| | _ <| |___ - * \___|\___/|_| \_\_____| - * - * Copyright (C) 1998 - 2008, Daniel Stenberg, <daniel@haxx.se>, 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 <string.h> - -#ifdef NEED_MALLOC_H -#include <malloc.h> -#endif -#ifdef HAVE_SYS_SOCKET_H -#include <sys/socket.h> -#endif -#ifdef HAVE_NETINET_IN_H -#include <netinet/in.h> -#endif -#ifdef HAVE_NETDB_H -#include <netdb.h> -#endif -#ifdef HAVE_ARPA_INET_H -#include <arpa/inet.h> -#endif -#ifdef HAVE_STDLIB_H -#include <stdlib.h> /* required for free() prototypes */ -#endif -#ifdef HAVE_UNISTD_H -#include <unistd.h> /* for the close() proto */ -#endif -#ifdef VMS -#include <in.h> -#include <inet.h> -#include <stdlib.h> -#endif - -#ifdef HAVE_SETJMP_H -#include <setjmp.h> -#endif - -#ifdef HAVE_PROCESS_H -#include <process.h> -#endif - -#include "urldata.h" -#include "sendf.h" -#include "hostip.h" -#include "hash.h" -#include "share.h" -#include "strerror.h" -#include "url.h" -#include "inet_ntop.h" - -#define _MPRINTF_REPLACE /* use our functions only */ -#include <curl/mprintf.h> - -#if defined(HAVE_INET_NTOA_R) && !defined(HAVE_INET_NTOA_R_DECL) -#include "inet_ntoa_r.h" -#endif - -#include "memory.h" -/* The last #include file should be: */ -#include "memdebug.h" - -/* - * hostip.c explained - * ================== - * - * The main COMPILE-TIME DEFINES to keep in mind when reading the host*.c - * source file are these: - * - * CURLRES_IPV6 - this host has getaddrinfo() and family, and thus we use - * that. The host may not be able to resolve IPv6, but we don't really have to - * take that into account. Hosts that aren't IPv6-enabled have CURLRES_IPV4 - * defined. - * - * CURLRES_ARES - is defined if libcurl is built to use c-ares for - * asynchronous name resolves. This can be Windows or *nix. - * - * CURLRES_THREADED - is defined if libcurl is built to run under (native) - * Windows, and then the name resolve will be done in a new thread, and the - * supported API will be the same as for ares-builds. - * - * If any of the two previous are defined, CURLRES_ASYNCH is defined too. If - * libcurl is not built to use an asynchronous resolver, CURLRES_SYNCH is - * defined. - * - * The host*.c sources files are split up like this: - * - * hostip.c - method-independent resolver functions and utility functions - * hostasyn.c - functions for asynchronous name resolves - * hostsyn.c - functions for synchronous name resolves - * hostares.c - functions for ares-using name resolves - * hostthre.c - functions for threaded name resolves - * hostip4.c - ipv4-specific functions - * hostip6.c - ipv6-specific functions - * - * The hostip.h is the united header file for all this. It defines the - * CURLRES_* defines based on the config*.h and setup.h defines. - */ - -/* These two symbols are for the global DNS cache */ -static struct curl_hash hostname_cache; -static int host_cache_initialized; - -static void freednsentry(void *freethis); - -/* - * Curl_global_host_cache_init() initializes and sets up a global DNS cache. - * Global DNS cache is general badness. Do not use. This will be removed in - * a future version. Use the share interface instead! - * - * Returns a struct curl_hash pointer on success, NULL on failure. - */ -struct curl_hash *Curl_global_host_cache_init(void) -{ - int rc = 0; - if(!host_cache_initialized) { - rc = Curl_hash_init(&hostname_cache, 7, Curl_hash_str, - Curl_str_key_compare, freednsentry); - if(!rc) - host_cache_initialized = 1; - } - return rc?NULL:&hostname_cache; -} - -/* - * Destroy and cleanup the global DNS cache - */ -void Curl_global_host_cache_dtor(void) -{ - if(host_cache_initialized) { - Curl_hash_clean(&hostname_cache); - host_cache_initialized = 0; - } -} - -/* - * Return # of adresses in a Curl_addrinfo struct - */ -int Curl_num_addresses(const Curl_addrinfo *addr) -{ - int i; - for (i = 0; addr; addr = addr->ai_next, i++) - ; /* empty loop */ - return i; -} - -/* - * Curl_printable_address() returns a printable version of the 1st address - * given in the 'ip' argument. The result will be stored in the buf that is - * bufsize bytes big. - * - * If the conversion fails, it returns NULL. - */ -const char *Curl_printable_address(const Curl_addrinfo *ip, - char *buf, size_t bufsize) -{ - const void *ip4 = &((const struct sockaddr_in*)ip->ai_addr)->sin_addr; - int af = ip->ai_family; -#ifdef CURLRES_IPV6 - const void *ip6 = &((const struct sockaddr_in6*)ip->ai_addr)->sin6_addr; -#else - const void *ip6 = NULL; -#endif - - return Curl_inet_ntop(af, af == AF_INET ? ip4 : ip6, buf, bufsize); -} - -/* - * Return a hostcache id string for the providing host + port, to be used by - * the DNS caching. - */ -static char * -create_hostcache_id(const char *server, int port) -{ - /* create and return the new allocated entry */ - return aprintf("%s:%d", server, port); -} - -struct hostcache_prune_data { - long cache_timeout; - time_t now; -}; - -/* - * This function is set as a callback to be called for every entry in the DNS - * cache when we want to prune old unused entries. - * - * Returning non-zero means remove the entry, return 0 to keep it in the - * cache. - */ -static int -hostcache_timestamp_remove(void *datap, void *hc) -{ - struct hostcache_prune_data *data = - (struct hostcache_prune_data *) datap; - struct Curl_dns_entry *c = (struct Curl_dns_entry *) hc; - - if((data->now - c->timestamp < data->cache_timeout) || - c->inuse) { - /* please don't remove */ - return 0; - } - - /* fine, remove */ - return 1; -} - -/* - * Prune the DNS cache. This assumes that a lock has already been taken. - */ -static void -hostcache_prune(struct curl_hash *hostcache, long cache_timeout, time_t now) -{ - struct hostcache_prune_data user; - - user.cache_timeout = cache_timeout; - user.now = now; - - Curl_hash_clean_with_criterium(hostcache, - (void *) &user, - hostcache_timestamp_remove); -} - -/* - * Library-wide function for pruning the DNS cache. This function takes and - * returns the appropriate locks. - */ -void Curl_hostcache_prune(struct SessionHandle *data) -{ - time_t now; - - if((data->set.dns_cache_timeout == -1) || !data->dns.hostcache) - /* cache forever means never prune, and NULL hostcache means - we can't do it */ - return; - - if(data->share) - Curl_share_lock(data, CURL_LOCK_DATA_DNS, CURL_LOCK_ACCESS_SINGLE); - - time(&now); - - /* Remove outdated and unused entries from the hostcache */ - hostcache_prune(data->dns.hostcache, - data->set.dns_cache_timeout, - now); - - if(data->share) - Curl_share_unlock(data, CURL_LOCK_DATA_DNS); -} - -/* - * Check if the entry should be pruned. Assumes a locked cache. - */ -static int -remove_entry_if_stale(struct SessionHandle *data, struct Curl_dns_entry *dns) -{ - struct hostcache_prune_data user; - - if( !dns || (data->set.dns_cache_timeout == -1) || !data->dns.hostcache) - /* cache forever means never prune, and NULL hostcache means - we can't do it */ - return 0; - - time(&user.now); - user.cache_timeout = data->set.dns_cache_timeout; - - if( !hostcache_timestamp_remove(&user,dns) ) - return 0; - - Curl_hash_clean_with_criterium(data->dns.hostcache, - (void *) &user, - hostcache_timestamp_remove); - - return 1; -} - - -#ifdef HAVE_SIGSETJMP -/* Beware this is a global and unique instance. This is used to store the - return address that we can jump back to from inside a signal handler. This - is not thread-safe stuff. */ -sigjmp_buf curl_jmpenv; -#endif - - -/* - * Curl_cache_addr() stores a 'Curl_addrinfo' struct in the DNS cache. - * - * When calling Curl_resolv() has resulted in a response with a returned - * address, we call this function to store the information in the dns - * cache etc - * - * Returns the Curl_dns_entry entry pointer or NULL if the storage failed. - */ -struct Curl_dns_entry * -Curl_cache_addr(struct SessionHandle *data, - Curl_addrinfo *addr, - const char *hostname, - int port) -{ - char *entry_id; - size_t entry_len; - struct Curl_dns_entry *dns; - struct Curl_dns_entry *dns2; - time_t now; - - /* Create an entry id, based upon the hostname and port */ - entry_id = create_hostcache_id(hostname, port); - /* If we can't create the entry id, fail */ - if(!entry_id) - return NULL; - entry_len = strlen(entry_id); - - /* Create a new cache entry */ - dns = (struct Curl_dns_entry *) calloc(sizeof(struct Curl_dns_entry), 1); - if(!dns) { - free(entry_id); - return NULL; - } - - dns->inuse = 0; /* init to not used */ - dns->addr = addr; /* this is the address(es) */ - - /* Store the resolved data in our DNS cache. This function may return a - pointer to an existing struct already present in the hash, and it may - return the same argument we pass in. Make no assumptions. */ - dns2 = Curl_hash_add(data->dns.hostcache, entry_id, entry_len+1, - (void *)dns); - if(!dns2) { - /* Major badness, run away. */ - free(dns); - free(entry_id); - return NULL; - } - time(&now); - dns = dns2; - - dns->timestamp = now; /* used now */ - dns->inuse++; /* mark entry as in-use */ - - /* free the allocated entry_id again */ - free(entry_id); - - return dns; -} - -/* - * Curl_resolv() is the main name resolve function within libcurl. It resolves - * a name and returns a pointer to the entry in the 'entry' argument (if one - * is provided). This function might return immediately if we're using asynch - * resolves. See the return codes. - * - * The cache entry we return will get its 'inuse' counter increased when this - * function is used. You MUST call Curl_resolv_unlock() later (when you're - * done using this struct) to decrease the counter again. - * - * Return codes: - * - * CURLRESOLV_ERROR (-1) = error, no pointer - * CURLRESOLV_RESOLVED (0) = OK, pointer provided - * CURLRESOLV_PENDING (1) = waiting for response, no pointer - */ - -int Curl_resolv(struct connectdata *conn, - const char *hostname, - int port, - struct Curl_dns_entry **entry) -{ - char *entry_id = NULL; - struct Curl_dns_entry *dns = NULL; - size_t entry_len; - struct SessionHandle *data = conn->data; - CURLcode result; - int rc = CURLRESOLV_ERROR; /* default to failure */ - *entry = NULL; - -#ifdef HAVE_SIGSETJMP - /* this allows us to time-out from the name resolver, as the timeout - will generate a signal and we will siglongjmp() from that here */ - if(!data->set.no_signal) { - if(sigsetjmp(curl_jmpenv, 1)) { - /* this is coming from a siglongjmp() */ - failf(data, "name lookup timed out"); - return rc; - } - } -#endif - - /* Create an entry id, based upon the hostname and port */ - entry_id = create_hostcache_id(hostname, port); - /* If we can't create the entry id, fail */ - if(!entry_id) - return rc; - - entry_len = strlen(entry_id); - - if(data->share) - Curl_share_lock(data, CURL_LOCK_DATA_DNS, CURL_LOCK_ACCESS_SINGLE); - - /* See if its already in our dns cache */ - dns = Curl_hash_pick(data->dns.hostcache, entry_id, entry_len+1); - - /* See whether the returned entry is stale. Done before we release lock */ - if( remove_entry_if_stale(data, dns) ) - dns = NULL; /* the memory deallocation is being handled by the hash */ - - if(dns) { - dns->inuse++; /* we use it! */ - rc = CURLRESOLV_RESOLVED; - } - - if(data->share) - Curl_share_unlock(data, CURL_LOCK_DATA_DNS); - - /* free the allocated entry_id again */ - free(entry_id); - - if(!dns) { - /* The entry was not in the cache. Resolve it to IP address */ - - Curl_addrinfo *addr; - int respwait; - - /* Check what IP specifics the app has requested and if we can provide it. - * If not, bail out. */ - if(!Curl_ipvalid(data)) - return CURLRESOLV_ERROR; - - /* If Curl_getaddrinfo() returns NULL, 'respwait' might be set to a - non-zero value indicating that we need to wait for the response to the - resolve call */ - addr = Curl_getaddrinfo(conn, hostname, port, &respwait); - - if(!addr) { - if(respwait) { - /* the response to our resolve call will come asynchronously at - a later time, good or bad */ - /* First, check that we haven't received the info by now */ - result = Curl_is_resolved(conn, &dns); - if(result) /* error detected */ - return CURLRESOLV_ERROR; - if(dns) - rc = CURLRESOLV_RESOLVED; /* pointer provided */ - else - rc = CURLRESOLV_PENDING; /* no info yet */ - } - } - else { - if(data->share) - Curl_share_lock(data, CURL_LOCK_DATA_DNS, CURL_LOCK_ACCESS_SINGLE); - - /* we got a response, store it in the cache */ - dns = Curl_cache_addr(data, addr, hostname, port); - - if(data->share) - Curl_share_unlock(data, CURL_LOCK_DATA_DNS); - - if(!dns) - /* returned failure, bail out nicely */ - Curl_freeaddrinfo(addr); - else - rc = CURLRESOLV_RESOLVED; - } - } - - *entry = dns; - - return rc; -} - -/* - * Curl_resolv_unlock() unlocks the given cached DNS entry. When this has been - * made, the struct may be destroyed due to pruning. It is important that only - * one unlock is made for each Curl_resolv() call. - */ -void Curl_resolv_unlock(struct SessionHandle *data, struct Curl_dns_entry *dns) -{ - DEBUGASSERT(dns && (dns->inuse>0)); - - if(data->share) - Curl_share_lock(data, CURL_LOCK_DATA_DNS, CURL_LOCK_ACCESS_SINGLE); - - dns->inuse--; - - if(data->share) - Curl_share_unlock(data, CURL_LOCK_DATA_DNS); -} - -/* - * File-internal: free a cache dns entry. - */ -static void freednsentry(void *freethis) -{ - struct Curl_dns_entry *p = (struct Curl_dns_entry *) freethis; - - Curl_freeaddrinfo(p->addr); - - free(p); -} - -/* - * Curl_mk_dnscache() creates a new DNS cache and returns the handle for it. - */ -struct curl_hash *Curl_mk_dnscache(void) -{ - return Curl_hash_alloc(7, Curl_hash_str, Curl_str_key_compare, freednsentry); -} - -#ifdef CURLRES_ADDRINFO_COPY - -/* align on even 64bit boundaries */ -#define MEMALIGN(x) ((x)+(8-(((unsigned long)(x))&0x7))) - -/* - * Curl_addrinfo_copy() performs a "deep" copy of a hostent into a buffer and - * returns a pointer to the malloc()ed copy. You need to call free() on the - * returned buffer when you're done with it. - */ -Curl_addrinfo *Curl_addrinfo_copy(const void *org, int port) -{ - const struct hostent *orig = org; - - return Curl_he2ai(orig, port); -} -#endif /* CURLRES_ADDRINFO_COPY */ - -/*********************************************************************** - * Only for plain-ipv4 and c-ares builds (NOTE: c-ares builds can be IPv6 - * enabled) - **********************************************************************/ - -#if defined(CURLRES_IPV4) || defined(CURLRES_ARES) -/* - * This is a function for freeing name information in a protocol independent - * way. - */ -void Curl_freeaddrinfo(Curl_addrinfo *ai) -{ - Curl_addrinfo *next; - - /* walk over the list and free all entries */ - while(ai) { - next = ai->ai_next; - if(ai->ai_canonname) - free(ai->ai_canonname); - free(ai); - ai = next; - } -} - -struct namebuf { - struct hostent hostentry; - char *h_addr_list[2]; - struct in_addr addrentry; - char h_name[16]; /* 123.123.123.123 = 15 letters is maximum */ -}; - -/* - * Curl_ip2addr() takes a 32bit ipv4 internet address as input parameter - * together with a pointer to the string version of the address, and it - * returns a Curl_addrinfo chain filled in correctly with information for this - * address/host. - * - * The input parameters ARE NOT checked for validity but they are expected - * to have been checked already when this is called. - */ -Curl_addrinfo *Curl_ip2addr(in_addr_t num, const char *hostname, int port) -{ - Curl_addrinfo *ai; - -#if defined(VMS) && \ - defined(__INITIAL_POINTER_SIZE) && (__INITIAL_POINTER_SIZE == 64) -#pragma pointer_size save -#pragma pointer_size short -#pragma message disable PTRMISMATCH -#endif - - struct hostent *h; - struct in_addr *addrentry; - struct namebuf buffer; - struct namebuf *buf = &buffer; - - h = &buf->hostentry; - h->h_addr_list = &buf->h_addr_list[0]; - addrentry = &buf->addrentry; -#ifdef _CRAYC - /* On UNICOS, s_addr is a bit field and for some reason assigning to it - * doesn't work. There must be a better fix than this ugly hack. - */ - memcpy(addrentry, &num, SIZEOF_in_addr); -#else - addrentry->s_addr = num; -#endif - h->h_addr_list[0] = (char*)addrentry; - h->h_addr_list[1] = NULL; - h->h_addrtype = AF_INET; - h->h_length = sizeof(*addrentry); - h->h_name = &buf->h_name[0]; - h->h_aliases = NULL; - - /* Now store the dotted version of the address */ - snprintf((char *)h->h_name, 16, "%s", hostname); - -#if defined(VMS) && \ - defined(__INITIAL_POINTER_SIZE) && (__INITIAL_POINTER_SIZE == 64) -#pragma pointer_size restore -#pragma message enable PTRMISMATCH -#endif - - ai = Curl_he2ai(h, port); - - return ai; -} - -/* - * Curl_he2ai() translates from a hostent struct to a Curl_addrinfo struct. - * The Curl_addrinfo is meant to work like the addrinfo struct does for IPv6 - * stacks, but for all hosts and environments. - * - * Curl_addrinfo defined in "lib/hostip.h" - * - * struct Curl_addrinfo { - * int ai_flags; - * int ai_family; - * int ai_socktype; - * int ai_protocol; - * socklen_t ai_addrlen; * Follow rfc3493 struct addrinfo * - * char *ai_canonname; - * struct sockaddr *ai_addr; - * struct Curl_addrinfo *ai_next; - * }; - * - * hostent defined in <netdb.h> - * - * struct hostent { - * char *h_name; - * char **h_aliases; - * int h_addrtype; - * int h_length; - * char **h_addr_list; - * }; - * - * for backward compatibility: - * - * #define h_addr h_addr_list[0] - */ - -Curl_addrinfo *Curl_he2ai(const struct hostent *he, int port) -{ - Curl_addrinfo *ai; - Curl_addrinfo *prevai = NULL; - Curl_addrinfo *firstai = NULL; - struct sockaddr_in *addr; -#ifdef CURLRES_IPV6 - struct sockaddr_in6 *addr6; -#endif /* CURLRES_IPV6 */ - int i; - struct in_addr *curr; - - if(!he) - /* no input == no output! */ - return NULL; - - for(i=0; (curr = (struct in_addr *)he->h_addr_list[i]) != NULL; i++) { - - int ss_size; -#ifdef CURLRES_IPV6 - if (he->h_addrtype == AF_INET6) - ss_size = sizeof (struct sockaddr_in6); - else -#endif /* CURLRES_IPV6 */ - ss_size = sizeof (struct sockaddr_in); - - ai = calloc(1, sizeof(Curl_addrinfo) + ss_size); - - if(!ai) - break; - - if(!firstai) - /* store the pointer we want to return from this function */ - firstai = ai; - - if(prevai) - /* make the previous entry point to this */ - prevai->ai_next = ai; - - ai->ai_family = he->h_addrtype; - - /* we return all names as STREAM, so when using this address for TFTP - the type must be ignored and conn->socktype be used instead! */ - ai->ai_socktype = SOCK_STREAM; - - ai->ai_addrlen = ss_size; - /* make the ai_addr point to the address immediately following this struct - and use that area to store the address */ - ai->ai_addr = (struct sockaddr *) ((char*)ai + sizeof(Curl_addrinfo)); - - /* need to free this eventually */ - ai->ai_canonname = strdup(he->h_name); - - /* leave the rest of the struct filled with zero */ - - switch (ai->ai_family) { - case AF_INET: - addr = (struct sockaddr_in *)ai->ai_addr; /* storage area for this info */ - - memcpy((char *)&(addr->sin_addr), curr, sizeof(struct in_addr)); - addr->sin_family = (unsigned short)(he->h_addrtype); - addr->sin_port = htons((unsigned short)port); - break; - -#ifdef CURLRES_IPV6 - case AF_INET6: - addr6 = (struct sockaddr_in6 *)ai->ai_addr; /* storage area for this info */ - - memcpy((char *)&(addr6->sin6_addr), curr, sizeof(struct in6_addr)); - addr6->sin6_family = (unsigned short)(he->h_addrtype); - addr6->sin6_port = htons((unsigned short)port); - break; -#endif /* CURLRES_IPV6 */ - } - - prevai = ai; - } - return firstai; -} - -#endif /* CURLRES_IPV4 || CURLRES_ARES */ |