X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=src%2Fnetwork%2Fgetaddrinfo.c;h=ff4f0fe77e8d39e043dc51d590e2b4ef91e82948;hb=59117b28623d003c2bf3374bf551f126da4322dc;hp=ac2d67b819ffea93b9bba7da4394ca35f7562fd7;hpb=5c2490264a2c92be8bdfc58ba988c2cda006165a;p=vlc diff --git a/src/network/getaddrinfo.c b/src/network/getaddrinfo.c index ac2d67b819..ff4f0fe77e 100644 --- a/src/network/getaddrinfo.c +++ b/src/network/getaddrinfo.c @@ -33,509 +33,15 @@ #include /* strlen(), memcpy(), memset(), strchr() */ #include /* malloc(), free(), strtoul() */ #include +#include -#ifdef HAVE_SYS_TYPES_H -# include -#endif -#ifdef HAVE_ARPA_INET_H -# include -#endif -#ifdef HAVE_NETINET_IN_H -# include -#endif -#ifdef HAVE_UNISTD_H -# include -#endif - +#include #include -#ifndef NO_ADDRESS -# define NO_ADDRESS NO_DATA -#endif -#ifndef INADDR_NONE -# define INADDR_NONE 0xFFFFFFFF -#endif #ifndef AF_UNSPEC # define AF_UNSPEC 0 #endif - -#ifndef HAVE_GAI_STRERROR -static const struct -{ - int code; - const char msg[41]; -} gai_errlist[] = -{ - { 0, "Error 0" }, - { EAI_BADFLAGS, "Invalid flag used" }, - { EAI_NONAME, "Host or service not found" }, - { EAI_AGAIN, "Temporary name service failure" }, - { EAI_FAIL, "Non-recoverable name service failure" }, - { EAI_NODATA, "No data for host name" }, - { EAI_FAMILY, "Unsupported address family" }, - { EAI_SOCKTYPE, "Unsupported socket type" }, - { EAI_SERVICE, "Incompatible service for socket type" }, - { EAI_ADDRFAMILY, "Unavailable address family for host name" }, - { EAI_MEMORY, "Memory allocation failure" }, - { EAI_OVERFLOW, "Buffer overflow" }, - { EAI_SYSTEM, "System error" }, - { 0, "" }, -}; - -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; i++) - if (errnum == gai_errlist[i].code) - return gai_errlist[i].msg; - - return gai_unknownerr; -} -#else /* ifndef HAVE_GAI_STRERROR */ -const char *vlc_gai_strerror (int errnum) -{ - return gai_strerror (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-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, - * and probably do not have getnameinfo(), but have the old gethostbyaddr() - * function. - * - * 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 -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)) - return EAI_FAMILY; - else if (flags & (~_NI_MASK)) - return EAI_BADFLAGS; - else - { - const struct sockaddr_in *addr; - - addr = (const struct sockaddr_in *)sa; - - if (host != NULL) - { - /* host name resolution */ - if (!(flags & NI_NUMERICHOST)) - { - if (flags & NI_NAMEREQD) - return EAI_NONAME; - } - - /* inet_ntoa() is not thread-safe, do not use it */ - uint32_t ipv4 = ntohl (addr->sin_addr.s_addr); - - if (snprintf (host, hostlen, "%u.%u.%u.%u", ipv4 >> 24, - (ipv4 >> 16) & 0xff, (ipv4 >> 8) & 0xff, - ipv4 & 0xff) >= (int)hostlen) - return EAI_OVERFLOW; - } - - if (serv != NULL) - { - if (snprintf (serv, servlen, "%u", - (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(). - */ -static int -gai_error_from_herrno (void) -{ - switch (h_errno) - { - case HOST_NOT_FOUND: - return EAI_NONAME; - - case NO_ADDRESS: -# if (NO_ADDRESS != NO_DATA) - case NO_DATA: -# endif - return EAI_NODATA; - - case NO_RECOVERY: - return EAI_FAIL; - - case TRY_AGAIN: - return EAI_AGAIN; - } - return EAI_SYSTEM; -} - -/* - * This functions must be used to free the memory allocated by getaddrinfo(). - */ -#ifdef WIN32 -static void WSAAPI stub_freeaddrinfo (struct addrinfo *res) -#else -static void stub_freeaddrinfo (struct addrinfo *res) -#endif -{ - if (res == NULL) - return; - free (res->ai_canonname); - free (res->ai_addr); - free (res->ai_next); - free (res); -} - - -/* - * Internal function that builds an addrinfo struct. - */ -static struct addrinfo * -makeaddrinfo (int af, int type, int proto, - const struct sockaddr *addr, size_t addrlen, - const char *canonname) -{ - struct addrinfo *res; - - res = (struct addrinfo *)malloc (sizeof (struct addrinfo)); - if (res != NULL) - { - res->ai_flags = 0; - res->ai_family = af; - res->ai_socktype = type; - res->ai_protocol = proto; - res->ai_addrlen = addrlen; - res->ai_addr = malloc (addrlen); - res->ai_canonname = NULL; - res->ai_next = NULL; - - if (res->ai_addr != NULL) - { - memcpy (res->ai_addr, addr, addrlen); - - if (canonname != NULL) - { - res->ai_canonname = strdup (canonname); - if (res->ai_canonname != NULL) - return res; /* success ! */ - } - else - return res; - } - } - /* failsafe */ - vlc_freeaddrinfo (res); - return NULL; -} - - -static struct addrinfo * -makeipv4info (int type, int proto, u_long ip, u_short port, const char *name) -{ - struct sockaddr_in addr; - - memset (&addr, 0, sizeof (addr)); - addr.sin_family = AF_INET; -# ifdef HAVE_SA_LEN - addr.sin_len = sizeof (addr); -# endif - addr.sin_port = port; - addr.sin_addr.s_addr = ip; - - return makeaddrinfo (AF_INET, type, proto, - (struct sockaddr*)&addr, sizeof (addr), name); -} - - -/* - * getaddrinfo() non-thread-safe IPv4-only implementation - * 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 -stub_getaddrinfo (const char *node, const char *service, - const struct addrinfo *hints, struct addrinfo **res) -#endif -{ - struct addrinfo *info; - u_long ip; - u_short port; - int protocol = 0, flags = 0; - const char *name = NULL; - -#ifdef WIN32 - /* - * Maybe you knew already that Winsock does not handle TCP/RST packets - * properly, so that when a TCP connection fails, it will wait until it - * times out even if the remote host did return a TCP/RST. However, it - * still sees the TCP/RST as the error code is 10061 instead of 10060. - * Basically, we have the stupid brainfucked behavior with DNS queries... - * When the recursive DNS server returns an error, Winsock waits about - * 2 seconds before it returns to the callers, even though it should know - * that is pointless. I'd like to know how come this hasn't been fixed - * for the past decade, or maybe not. - * - * Anyway, this is causing a severe delay when the SAP listener tries - * to resolve more than ten IPv6 numeric addresses. Modern systems will - * eventually realize that it is an IPv6 address, and won't try to resolve - * it as a IPv4 address via the Domain Name Service. Old systems - * (including Windows XP without the IPv6 stack) will not. It is normally - * not an issue as the DNS server usually returns an error very quickly. - * But it IS a severe issue on Windows, given the bug explained above. - * So here comes one more bug-to-bug Windows compatibility fix. - */ - if ((node != NULL) && (strchr (node, ':') != NULL)) - return EAI_NONAME; -#endif - - if (hints != NULL) - { - flags = hints->ai_flags; - - if (flags & ~_AI_MASK) - return EAI_BADFLAGS; - /* only accept AF_INET and AF_UNSPEC */ - if (hints->ai_family && (hints->ai_family != AF_INET)) - return EAI_FAMILY; - - /* protocol sanity check */ - switch (hints->ai_socktype) - { - case SOCK_STREAM: - protocol = IPPROTO_TCP; - break; - - case SOCK_DGRAM: - protocol = IPPROTO_UDP; - break; - -#ifndef SOCK_RAW - case SOCK_RAW: -#endif - case 0: - break; - - default: - return EAI_SOCKTYPE; - } - if (hints->ai_protocol && protocol - && (protocol != hints->ai_protocol)) - return EAI_SERVICE; - } - - *res = NULL; - - /* default values */ - if (node == NULL) - { - if (flags & AI_PASSIVE) - ip = htonl (INADDR_ANY); - else - ip = htonl (INADDR_LOOPBACK); - } - else - if ((ip = inet_addr (node)) == INADDR_NONE) - { - struct hostent *entry = NULL; - - /* hostname resolution */ - if (!(flags & AI_NUMERICHOST)) - entry = gethostbyname (node); - - if (entry == NULL) - return gai_error_from_herrno (); - - if ((entry->h_length != 4) || (entry->h_addrtype != AF_INET)) - return EAI_FAMILY; - - ip = *((u_long *) entry->h_addr); - if (flags & AI_CANONNAME) - name = entry->h_name; - } - - if ((flags & AI_CANONNAME) && (name == NULL)) - name = node; - - /* service resolution */ - if (service == NULL) - port = 0; - else - { - unsigned long d; - char *end; - - d = strtoul (service, &end, 0); - if (end[0] || (d > 65535u)) - return EAI_SERVICE; - - port = htons ((u_short)d); - } - - /* building results... */ - if ((!protocol) || (protocol == IPPROTO_UDP)) - { - info = makeipv4info (SOCK_DGRAM, IPPROTO_UDP, ip, port, name); - if (info == NULL) - { - errno = ENOMEM; - return EAI_SYSTEM; - } - if (flags & AI_PASSIVE) - info->ai_flags |= AI_PASSIVE; - *res = info; - } - if ((!protocol) || (protocol == IPPROTO_TCP)) - { - info = makeipv4info (SOCK_STREAM, IPPROTO_TCP, ip, port, name); - if (info == NULL) - { - errno = ENOMEM; - return EAI_SYSTEM; - } - info->ai_next = *res; - if (flags & AI_PASSIVE) - info->ai_flags |= AI_PASSIVE; - *res = info; - } - - return 0; -} -#undef getaddrinfo -#define getaddrifo stub_getaddrinfo -#undef freeaddrinfo -#define freeaddrifo stub_freeaddrinfo -#endif /* if !HAVE_GETADDRINFO */ - -#if defined( WIN32 ) && !defined( UNDER_CE ) - /* - * Here is the kind of kludge you need to keep binary compatibility among - * varying OS versions... - */ -typedef int (WSAAPI * GETNAMEINFO) ( const struct sockaddr FAR *, socklen_t, - char FAR *, DWORD, char FAR *, DWORD, int ); -typedef int (WSAAPI * GETADDRINFO) (const char FAR *, const char FAR *, - const struct addrinfo FAR *, - struct addrinfo FAR * FAR *); - -typedef void (WSAAPI * FREEADDRINFO) ( struct addrinfo FAR * ); - -static int WSAAPI _ws2_getnameinfo_bind ( const struct sockaddr FAR *, socklen_t, - char FAR *, DWORD, char FAR *, DWORD, int ); -static int WSAAPI _ws2_getaddrinfo_bind (const char FAR *, const char FAR *, - const struct addrinfo FAR *, - struct addrinfo FAR * FAR *); - -static GETNAMEINFO ws2_getnameinfo = _ws2_getnameinfo_bind; -static GETADDRINFO ws2_getaddrinfo = _ws2_getaddrinfo_bind; -static FREEADDRINFO ws2_freeaddrinfo; - -static FARPROC ws2_find_api (LPCTSTR name) -{ - FARPROC f = NULL; - - HMODULE m = GetModuleHandle (TEXT("WS2_32")); - if (m != NULL) - f = GetProcAddress (m, name); - - if (f == NULL) - { - /* Windows 2K IPv6 preview */ - m = LoadLibrary (TEXT("WSHIP6")); - if (m != NULL) - f = GetProcAddress (m, name); - } - - return f; -} - -static WSAAPI int _ws2_getnameinfo_bind( const struct sockaddr FAR * sa, socklen_t salen, - char FAR *host, DWORD hostlen, char FAR *serv, DWORD servlen, int flags ) -{ - GETNAMEINFO entry = (GETNAMEINFO)ws2_find_api (TEXT("getnameinfo")); - int result; - - if (entry == NULL) - { - /* not found, use replacement API instead */ - entry = stub_getnameinfo; - } - /* 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 - -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)) - { - /* not found, use replacement API instead */ - entry = stub_getaddrinfo; - freentry = stub_freeaddrinfo; - } - /* 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 -#define getaddrinfo ws2_getaddrinfo -#define freeaddrinfo ws2_freeaddrinfo -#define HAVE_GETADDRINFO -#endif - - int vlc_getnameinfo( const struct sockaddr *sa, int salen, char *host, int hostlen, int *portnum, int flags ) { @@ -563,6 +69,18 @@ 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 + * freeaddrinfo(). + */ int vlc_getaddrinfo( vlc_object_t *p_this, const char *node, int i_port, const struct addrinfo *p_hints, struct addrinfo **res ) @@ -676,17 +194,14 @@ int vlc_getaddrinfo( vlc_object_t *p_this, const char *node, #endif ret = getaddrinfo (node, psz_service, &hints, res); +#if defined(AI_IDN) || defined(WIN32) out: +#endif LocaleFree (node); return ret; } -void vlc_freeaddrinfo( struct addrinfo *infos ) -{ - freeaddrinfo (infos); -} - /** * inet_pton() replacement */