X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=src%2Fnetwork%2Fgetaddrinfo.c;h=5f73492df81c395fbcf65f4b42e527c1a96fd432;hb=8821427110a1d353ed27eaef577a2057923f46a1;hp=70183d6b141cf80349c8018d354959dfcce9c3be;hpb=b6bf43814fd1b6a170ade03ea06b21528b7be893;p=vlc diff --git a/src/network/getaddrinfo.c b/src/network/getaddrinfo.c index 70183d6b14..5f73492df8 100644 --- a/src/network/getaddrinfo.c +++ b/src/network/getaddrinfo.c @@ -22,12 +22,18 @@ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA. *****************************************************************************/ -#include +#ifdef HAVE_CONFIG_H +# include "config.h" +#endif + +#include +#include #include /* size_t */ #include /* strlen(), memcpy(), memset(), strchr() */ #include /* malloc(), free(), strtoul() */ #include +#include #ifdef HAVE_SYS_TYPES_H # include @@ -54,17 +60,13 @@ # define AF_UNSPEC 0 #endif -#define _NI_MASK (NI_NUMERICHOST|NI_NUMERICSERV|NI_NOFQDN|NI_NAMEREQD|\ - NI_DGRAM) -#define _AI_MASK (AI_PASSIVE|AI_CANONNAME|AI_NUMERICHOST) - #ifndef HAVE_GAI_STRERROR -static struct +static const struct { - int code; - const char *msg; -} const __gai_errlist[] = + int code; + const char msg[41]; +} gai_errlist[] = { { 0, "Error 0" }, { EAI_BADFLAGS, "Invalid flag used" }, @@ -79,21 +81,21 @@ static struct { EAI_MEMORY, "Memory allocation failure" }, { EAI_OVERFLOW, "Buffer overflow" }, { EAI_SYSTEM, "System error" }, - { 0, NULL } + { 0, "" }, }; -static const char *__gai_unknownerr = "Unrecognized error number"; +static const char gai_unknownerr[] = "Unrecognized error number"; /**************************************************************************** * Converts an EAI_* error code into human readable english text. ****************************************************************************/ const char *vlc_gai_strerror (int errnum) { - for (unsigned i = 0; __gai_errlist[i].msg != NULL; i++) - if (errnum == __gai_errlist[i].code) - return __gai_errlist[i].msg; + for (unsigned i = 0; *gai_errlist[i].msg; i++) + if (errnum == gai_errlist[i].code) + return gai_errlist[i].msg; - return __gai_unknownerr; + return gai_unknownerr; } #else /* ifndef HAVE_GAI_STRERROR */ const char *vlc_gai_strerror (int errnum) @@ -103,9 +105,11 @@ const char *vlc_gai_strerror (int errnum) #endif #ifndef HAVE_GETNAMEINFO +#define _NI_MASK (NI_NUMERICHOST|NI_NUMERICSERV|NI_NOFQDN|NI_NAMEREQD|\ + NI_DGRAM) /* * getnameinfo() non-thread-safe IPv4-only implementation, - * Address-family-independant address to hostname translation + * Address-family-independent address to hostname translation * (reverse DNS lookup in case of IPv4). * * This is meant for use on old IP-enabled systems that are not IPv6-aware, @@ -115,9 +119,15 @@ const char *vlc_gai_strerror (int errnum) * GNU C library 2.0.x is known to lack this function, even though it defines * getaddrinfo(). */ +#ifdef WIN32 +static int WSAAPI +stub_getnameinfo (const struct sockaddr *sa, socklen_t salen, + char *host, DWORD hostlen, char *serv, DWORD servlen, int flags) +#else static int -getnameinfo (const struct sockaddr *sa, socklen_t salen, +stub_getnameinfo (const struct sockaddr *sa, socklen_t salen, char *host, int hostlen, char *serv, int servlen, int flags) +#endif { if (((size_t)salen < sizeof (struct sockaddr_in)) || (sa->sa_family != AF_INET)) @@ -144,23 +154,25 @@ getnameinfo (const struct sockaddr *sa, socklen_t salen, if (snprintf (host, hostlen, "%u.%u.%u.%u", ipv4 >> 24, (ipv4 >> 16) & 0xff, (ipv4 >> 8) & 0xff, - ipv4 & 0xff) >= hostlen) + ipv4 & 0xff) >= (int)hostlen) return EAI_OVERFLOW; } if (serv != NULL) { if (snprintf (serv, servlen, "%u", - (unsigned int)ntohs (addr->sin_port)) >= servlen) + (unsigned int)ntohs (addr->sin_port)) >= (int)servlen) return EAI_OVERFLOW; } } return 0; } - +#undef getnameinfo +#define getnameifo stub_getnameinfo #endif /* if !HAVE_GETNAMEINFO */ #ifndef HAVE_GETADDRINFO +#define _AI_MASK (AI_PASSIVE|AI_CANONNAME|AI_NUMERICHOST) /* * Converts the current herrno error value into an EAI_* error code. * That error code is normally returned by getnameinfo() or getaddrinfo(). @@ -191,18 +203,18 @@ gai_error_from_herrno (void) /* * This functions must be used to free the memory allocated by getaddrinfo(). */ -static void freeaddrinfo (struct addrinfo *res) +#ifdef WIN32 +static void WSAAPI stub_freeaddrinfo (struct addrinfo *res) +#else +static void stub_freeaddrinfo (struct addrinfo *res) +#endif { - if (res != NULL) - { - if (res->ai_canonname != NULL) - free (res->ai_canonname); - if (res->ai_addr != NULL) - free (res->ai_addr); - if (res->ai_next != NULL) - free (res->ai_next); - free (res); - } + if (res == NULL) + return; + free (res->ai_canonname); + free (res->ai_addr); + free (res->ai_next); + free (res); } @@ -268,16 +280,22 @@ makeipv4info (int type, int proto, u_long ip, u_short port, const char *name) /* * getaddrinfo() non-thread-safe IPv4-only implementation - * Address-family-independant hostname to address resolution. + * Address-family-independent hostname to address resolution. * * This is meant for IPv6-unaware systems that do probably not provide * getaddrinfo(), but still have old function gethostbyname(). * * Only UDP and TCP over IPv4 are supported here. */ +#ifdef WIN32 +static int WSAAPI +stub_getaddrinfo (const char *node, const char *service, + const struct addrinfo *hints, struct addrinfo **res) +#else static int -getaddrinfo (const char *node, const char *service, +stub_getaddrinfo (const char *node, const char *service, const struct addrinfo *hints, struct addrinfo **res) +#endif { struct addrinfo *info; u_long ip; @@ -383,38 +401,14 @@ getaddrinfo (const char *node, const char *service, port = 0; else { - long d; + unsigned long d; char *end; d = strtoul (service, &end, 0); - if (end[0] /* service is not a number */ - || (d > 65535)) - { - struct servent *entry; - const char *protoname; - - switch (protocol) - { - case IPPROTO_TCP: - protoname = "tcp"; - break; - - case IPPROTO_UDP: - protoname = "udp"; - break; - - default: - protoname = NULL; - } - - entry = getservbyname (service, protoname); - if (entry == NULL) - return EAI_SERVICE; + if (end[0] || (d > 65535u)) + return EAI_SERVICE; - port = entry->s_port; - } - else - port = htons ((u_short)d); + port = htons ((u_short)d); } /* building results... */ @@ -446,6 +440,10 @@ getaddrinfo (const char *node, const char *service, return 0; } +#undef getaddrinfo +#define getaddrifo stub_getaddrinfo +#undef freeaddrinfo +#define freeaddrifo stub_freeaddrinfo #endif /* if !HAVE_GETADDRINFO */ #if defined( WIN32 ) && !defined( UNDER_CE ) @@ -494,43 +492,42 @@ static WSAAPI int _ws2_getnameinfo_bind( const struct sockaddr FAR * sa, socklen char FAR *host, DWORD hostlen, char FAR *serv, DWORD servlen, int flags ) { GETNAMEINFO entry = (GETNAMEINFO)ws2_find_api (TEXT("getnameinfo")); - if (entry != NULL) + int result; + + if (entry == NULL) { - /* call API before replacing function pointer to avoid crash */ - int result = entry (sa, salen, host, hostlen, serv, servlen, flags); - ws2_getnameinfo = entry; - return result; + /* not found, use replacement API instead */ + entry = stub_getnameinfo; } - return getnameinfo (sa, salen, host, hostlen, serv, servlen, flags); + /* call API before replacing function pointer to avoid crash */ + result = entry (sa, salen, host, hostlen, serv, servlen, flags); + ws2_getnameinfo = entry; + return result; } #undef getnameinfo #define getnameinfo ws2_getnameinfo -/* So much for using different calling conventions */ -static WSAAPI void call_freeaddrinfo (struct addrinfo *infos) -{ - freeaddrinfo (infos); -} - static WSAAPI int _ws2_getaddrinfo_bind(const char FAR *node, const char FAR *service, const struct addrinfo FAR *hints, struct addrinfo FAR * FAR *res) { GETADDRINFO entry; FREEADDRINFO freentry; + int result; entry = (GETADDRINFO)ws2_find_api (TEXT("getaddrinfo")); freentry = (FREEADDRINFO)ws2_find_api (TEXT("freeaddrinfo")); - if ((entry != NULL) && (freentry != NULL)) + if ((entry == NULL) || (freentry == NULL)) { - /* call API before replacing function pointer to avoid crash */ - int result = entry (node, service, hints, res); - ws2_freeaddrinfo = freentry; - ws2_getaddrinfo = entry; - return result; + /* not found, use replacement API instead */ + entry = stub_getaddrinfo; + freentry = stub_freeaddrinfo; } - ws2_freeaddrinfo = call_freeaddrinfo; - return getaddrinfo (node, service, hints, res); + /* call API before replacing function pointer to avoid crash */ + result = entry (node, service, hints, res); + ws2_freeaddrinfo = freentry; + ws2_getaddrinfo = entry; + return result; } #undef getaddrinfo #undef freeaddrinfo @@ -540,7 +537,6 @@ static WSAAPI int _ws2_getaddrinfo_bind(const char FAR *node, const char FAR *se #endif - int vlc_getnameinfo( const struct sockaddr *sa, int salen, char *host, int hostlen, int *portnum, int flags ) { @@ -568,12 +564,24 @@ int vlc_getnameinfo( const struct sockaddr *sa, int salen, } +/** + * Resolves a host name to a list of socket addresses (like getaddrinfo()). + * + * @param p_this a VLC object + * @param node host name to resolve (encoded as UTF-8), or NULL + * @param i_port port number for the socket addresses + * @param p_hints parameters (see getaddrinfo() manual page) + * @param res pointer set to the resulting chained list. + * @return 0 on success, a getaddrinfo() error otherwise. + * On failure, *res is undefined. On success, it must be freed with + * vlc_freeaddrinfo(). + */ int vlc_getaddrinfo( vlc_object_t *p_this, const char *node, int i_port, const struct addrinfo *p_hints, struct addrinfo **res ) { struct addrinfo hints; - char psz_buf[NI_MAXHOST], *psz_node, psz_service[6]; + char psz_buf[NI_MAXHOST], psz_service[6]; /* * In VLC, we always use port number as integer rather than strings @@ -589,26 +597,47 @@ int vlc_getaddrinfo( vlc_object_t *p_this, const char *node, snprintf( psz_service, 6, "%d", i_port ); /* Check if we have to force ipv4 or ipv6 */ - if( p_hints == NULL ) - memset( &hints, 0, sizeof( hints ) ); - else - memcpy( &hints, p_hints, sizeof( hints ) ); - - if( hints.ai_family == AF_UNSPEC ) + memset (&hints, 0, sizeof (hints)); + if (p_hints != NULL) { - vlc_value_t val; + const int safe_flags = + AI_PASSIVE | + AI_CANONNAME | + AI_NUMERICHOST | + AI_NUMERICSERV | +#ifdef AI_ALL + AI_ALL | +#endif +#ifdef AI_ADDRCONFIG + AI_ADDRCONFIG | +#endif +#ifdef AI_V4MAPPED + AI_V4MAPPED | +#endif + 0; + + hints.ai_family = p_hints->ai_family; + hints.ai_socktype = p_hints->ai_socktype; + hints.ai_protocol = p_hints->ai_protocol; + /* Unfortunately, some flags chang the layout of struct addrinfo, so + * they cannot be copied blindly from p_hints to &hints. Therefore, we + * only copy flags that we know for sure are "safe". + */ + hints.ai_flags = p_hints->ai_flags & safe_flags; + } - var_Create( p_this, "ipv4", VLC_VAR_BOOL | VLC_VAR_DOINHERIT ); - var_Get( p_this, "ipv4", &val ); - if( val.b_bool ) - hints.ai_family = AF_INET; + /* We only ever use port *numbers* */ + hints.ai_flags |= AI_NUMERICSERV; + if( hints.ai_family == AF_UNSPEC ) + { #ifdef AF_INET6 - var_Create( p_this, "ipv6", VLC_VAR_BOOL | VLC_VAR_DOINHERIT ); - var_Get( p_this, "ipv6", &val ); - if( val.b_bool ) + if (var_CreateGetBool (p_this, "ipv6")) hints.ai_family = AF_INET6; + else #endif + if (var_CreateGetBool (p_this, "ipv4")) + hints.ai_family = AF_INET; } /* @@ -616,29 +645,25 @@ int vlc_getaddrinfo( vlc_object_t *p_this, const char *node, * - accept "" as NULL * - ignore square brackets */ - if( ( node == NULL ) || (node[0] == '\0' ) ) + if (node != NULL) { - psz_node = NULL; - } - else - { - strlcpy( psz_buf, node, NI_MAXHOST ); - - psz_node = psz_buf; - - if( psz_buf[0] == '[' ) + if (node[0] == '[') { - char *ptr; - - ptr = strrchr( psz_buf, ']' ); - if( ( ptr != NULL ) && (ptr[1] == '\0' ) ) + size_t len = strlen (node + 1); + if ((len <= sizeof (psz_buf)) && (node[len] == ']')) { - *ptr = '\0'; - psz_node++; + assert (len > 0); + memcpy (psz_buf, node + 1, len - 1); + psz_buf[len - 1] = '\0'; + node = psz_buf; } } + if (node[0] == '\0') + node = NULL; } + int ret; + node = ToLocale (node); #ifdef WIN32 /* * Winsock tries to resolve numerical IPv4 addresses as AAAA @@ -647,45 +672,26 @@ int vlc_getaddrinfo( vlc_object_t *p_this, const char *node, if ((hints.ai_flags & AI_NUMERICHOST) == 0) { hints.ai_flags |= AI_NUMERICHOST; - - if (getaddrinfo (psz_node, psz_service, &hints, res) == 0) - return 0; - + ret = getaddrinfo (node, psz_service, &hints, res); + if (ret == 0) + goto out; hints.ai_flags &= ~AI_NUMERICHOST; } #endif -#if defined (HAVE_GETADDRINFO) -# ifdef AI_IDN +#ifdef AI_IDN /* Run-time I18n Domain Names support */ - static vlc_bool_t b_idn = VLC_TRUE; /* beware of thread-safety */ - - if (b_idn) - { - hints.ai_flags |= AI_IDN; - int ret = getaddrinfo (psz_node, psz_service, &hints, res); - - if (ret != EAI_BADFLAGS) - return ret; - - /* IDN not available: disable and retry without it */ - hints.ai_flags &= ~AI_IDN; - b_idn = VLC_FALSE; - msg_Info (p_this, "International Domain Names not supported"); - } -# endif - return getaddrinfo (psz_node, psz_service, &hints, res); -#else - int ret; - vlc_value_t lock; - - var_Create (p_this->p_libvlc, "getaddrinfo_mutex", VLC_VAR_MUTEX); - var_Get (p_this->p_libvlc, "getaddrinfo_mutex", &lock); - vlc_mutex_lock (lock.p_address); + hints.ai_flags |= AI_IDN; + ret = getaddrinfo (node, psz_service, &hints, res); + if (ret != EAI_BADFLAGS) + goto out; + /* IDN not available: disable and retry without it */ + hints.ai_flags &= ~AI_IDN; +#endif + ret = getaddrinfo (node, psz_service, &hints, res); - ret = getaddrinfo (psz_node, psz_service, &hints, res); - vlc_mutex_unlock (lock.p_address); +out: + LocaleFree (node); return ret; -#endif } @@ -693,3 +699,87 @@ void vlc_freeaddrinfo( struct addrinfo *infos ) { freeaddrinfo (infos); } + +/** + * inet_pton() replacement + */ +int vlc_inet_pton (int af, const char *src, void *dst) +{ +#ifndef HAVE_INET_PTON + /* Windows Vista has inet_pton(), but not XP. */ + /* We have a pretty good example of abstraction inversion here... */ + struct addrinfo hints = { + .ai_family = af, + .ai_socktype = SOCK_DGRAM, /* make sure we have... */ + .ai_protocol = IPPROTO_UDP, /* ...only one response */ + .ai_flags = AI_NUMERICHOST, + }, *res; + + if (getaddrinfo (src, NULL, &hints, &res)) + return 0; + + const void *data; + size_t len; + + switch (af) + { + case AF_INET: + data = &((const struct sockaddr_in *)res->ai_addr)->sin_addr; + len = sizeof (struct in_addr); + break; +#ifdef AF_INET6 + case AF_INET6: + data = &((const struct sockaddr_in6 *)res->ai_addr)->sin6_addr; + len = sizeof (struct in6_addr); + break; +#endif + default: + freeaddrinfo (res); + return -1; + } + memcpy (dst, data, len); + freeaddrinfo (res); + return 1; +#else /* HAVE_INET_PTON */ + return inet_pton( af, src, dst ); +#endif /* HAVE_INET_PTON */ +} + +/** + * inet_ntop() replacement + */ +const char *vlc_inet_ntop (int af, const void *src, char *dst, socklen_t cnt) +{ +#ifndef HAVE_INET_NTOP + int ret = EAI_FAMILY; + + switch (af) + { +#ifdef AF_INET6 + case AF_INET6: + { + struct sockaddr_in6 addr; + memset (&addr, 0, sizeof(addr)); + addr.sin6_family = AF_INET6; + addr.sin6_addr = *(struct in6_addr *)src; + ret = getnameinfo ((struct sockaddr *)&addr, sizeof (addr), + dst, cnt, NULL, 0, NI_NUMERICHOST); + } + +#endif + case AF_INET: + { + struct sockaddr_in addr; + memset(&addr, 0, sizeof(addr)); + addr.sin_family = AF_INET; + addr.sin_addr = *(struct in_addr *)src; + ret = getnameinfo ((struct sockaddr *)&addr, sizeof (addr), + dst, cnt, NULL, 0, NI_NUMERICHOST); + } + } + return (ret == 0) ? dst : NULL; +#else /* HAVE_INET_NTOP */ + return inet_ntop( af, src, dst, cnt ); +#endif /* HAVE_INET_NTOP */ +} +