/*************************************************************************** * _ _ ____ _ * Project ___| | | | _ \| | * / __| | | | |_) | | * | (__| |_| | _ <| |___ * \___|\___/|_| \_\_____| * * Copyright (C) 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 https://curl.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. * * SPDX-License-Identifier: curl * ***************************************************************************/ #include "curl_setup.h" #include #ifdef HAVE_NETINET_IN_H # include #endif #ifdef HAVE_NETINET_IN6_H # include #endif #ifdef HAVE_NETDB_H # include #endif #ifdef HAVE_ARPA_INET_H # include #endif #ifdef HAVE_SYS_UN_H # include #endif #ifdef __VMS # include # include #endif #include #include "curl_addrinfo.h" #include "inet_pton.h" #include "warnless.h" /* The last 3 #include files should be in this order */ #include "curl_printf.h" #include "curl_memory.h" #include "memdebug.h" /* * Curl_freeaddrinfo() * * This is used to free a linked list of Curl_addrinfo structs along * with all its associated allocated storage. This function should be * called once for each successful call to Curl_getaddrinfo_ex() or to * any function call which actually allocates a Curl_addrinfo struct. */ #if defined(__INTEL_COMPILER) && (__INTEL_COMPILER == 910) && \ defined(__OPTIMIZE__) && defined(__unix__) && defined(__i386__) /* workaround icc 9.1 optimizer issue */ # define vqualifier volatile #else # define vqualifier #endif void Curl_freeaddrinfo(struct Curl_addrinfo *cahead) { struct Curl_addrinfo *vqualifier canext; struct Curl_addrinfo *ca; for(ca = cahead; ca; ca = canext) { canext = ca->ai_next; free(ca); } } #ifdef HAVE_GETADDRINFO /* * Curl_getaddrinfo_ex() * * This is a wrapper function around system's getaddrinfo(), with * the only difference that instead of returning a linked list of * addrinfo structs this one returns a linked list of Curl_addrinfo * ones. The memory allocated by this function *MUST* be free'd with * Curl_freeaddrinfo(). For each successful call to this function * there must be an associated call later to Curl_freeaddrinfo(). * * There should be no single call to system's getaddrinfo() in the * whole library, any such call should be 'routed' through this one. */ int Curl_getaddrinfo_ex(const char *nodename, const char *servname, const struct addrinfo *hints, struct Curl_addrinfo **result) { const struct addrinfo *ai; struct addrinfo *aihead; struct Curl_addrinfo *cafirst = NULL; struct Curl_addrinfo *calast = NULL; struct Curl_addrinfo *ca; size_t ss_size; int error; *result = NULL; /* assume failure */ error = getaddrinfo(nodename, servname, hints, &aihead); if(error) return error; /* traverse the addrinfo list */ for(ai = aihead; ai != NULL; ai = ai->ai_next) { size_t namelen = ai->ai_canonname ? strlen(ai->ai_canonname) + 1 : 0; /* ignore elements with unsupported address family, */ /* settle family-specific sockaddr structure size. */ if(ai->ai_family == AF_INET) ss_size = sizeof(struct sockaddr_in); #ifdef ENABLE_IPV6 else if(ai->ai_family == AF_INET6) ss_size = sizeof(struct sockaddr_in6); #endif else continue; /* ignore elements without required address info */ if(!ai->ai_addr || !(ai->ai_addrlen > 0)) continue; /* ignore elements with bogus address size */ if((size_t)ai->ai_addrlen < ss_size) continue; ca = malloc(sizeof(struct Curl_addrinfo) + ss_size + namelen); if(!ca) { error = EAI_MEMORY; break; } /* copy each structure member individually, member ordering, */ /* size, or padding might be different for each platform. */ ca->ai_flags = ai->ai_flags; ca->ai_family = ai->ai_family; ca->ai_socktype = ai->ai_socktype; ca->ai_protocol = ai->ai_protocol; ca->ai_addrlen = (curl_socklen_t)ss_size; ca->ai_addr = NULL; ca->ai_canonname = NULL; ca->ai_next = NULL; ca->ai_addr = (void *)((char *)ca + sizeof(struct Curl_addrinfo)); memcpy(ca->ai_addr, ai->ai_addr, ss_size); if(namelen) { ca->ai_canonname = (void *)((char *)ca->ai_addr + ss_size); memcpy(ca->ai_canonname, ai->ai_canonname, namelen); } /* if the return list is empty, this becomes the first element */ if(!cafirst) cafirst = ca; /* add this element last in the return list */ if(calast) calast->ai_next = ca; calast = ca; } /* destroy the addrinfo list */ if(aihead) freeaddrinfo(aihead); /* if we failed, also destroy the Curl_addrinfo list */ if(error) { Curl_freeaddrinfo(cafirst); cafirst = NULL; } else if(!cafirst) { #ifdef EAI_NONAME /* rfc3493 conformant */ error = EAI_NONAME; #else /* rfc3493 obsoleted */ error = EAI_NODATA; #endif #ifdef USE_WINSOCK SET_SOCKERRNO(error); #endif } *result = cafirst; /* This is not a CURLcode */ return error; } #endif /* HAVE_GETADDRINFO */ /* * Curl_he2ai() * * This function returns a pointer to the first element of a newly allocated * Curl_addrinfo struct linked list filled with the data of a given hostent. * Curl_addrinfo is meant to work like the addrinfo struct does for a IPv6 * stack, but usable also for IPv4, all hosts and environments. * * The memory allocated by this function *MUST* be free'd later on calling * Curl_freeaddrinfo(). For each successful call to this function there * must be an associated call later to Curl_freeaddrinfo(). * * Curl_addrinfo defined in "lib/curl_addrinfo.h" * * struct Curl_addrinfo { * int ai_flags; * int ai_family; * int ai_socktype; * int ai_protocol; * curl_socklen_t ai_addrlen; * Follow rfc3493 struct addrinfo * * char *ai_canonname; * struct sockaddr *ai_addr; * struct Curl_addrinfo *ai_next; * }; * * hostent defined in * * 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] */ struct Curl_addrinfo * Curl_he2ai(const struct hostent *he, int port) { struct Curl_addrinfo *ai; struct Curl_addrinfo *prevai = NULL; struct Curl_addrinfo *firstai = NULL; struct sockaddr_in *addr; #ifdef ENABLE_IPV6 struct sockaddr_in6 *addr6; #endif CURLcode result = CURLE_OK; int i; char *curr; if(!he) /* no input == no output! */ return NULL; DEBUGASSERT((he->h_name != NULL) && (he->h_addr_list != NULL)); for(i = 0; (curr = he->h_addr_list[i]) != NULL; i++) { size_t ss_size; size_t namelen = strlen(he->h_name) + 1; /* include null-terminator */ #ifdef ENABLE_IPV6 if(he->h_addrtype == AF_INET6) ss_size = sizeof(struct sockaddr_in6); else #endif ss_size = sizeof(struct sockaddr_in); /* allocate memory to hold the struct, the address and the name */ ai = calloc(1, sizeof(struct Curl_addrinfo) + ss_size + namelen); if(!ai) { result = CURLE_OUT_OF_MEMORY; break; } /* put the address after the struct */ ai->ai_addr = (void *)((char *)ai + sizeof(struct Curl_addrinfo)); /* then put the name after the address */ ai->ai_canonname = (char *)ai->ai_addr + ss_size; memcpy(ai->ai_canonname, he->h_name, namelen); 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 = (curl_socklen_t)ss_size; /* leave the rest of the struct filled with zero */ switch(ai->ai_family) { case AF_INET: addr = (void *)ai->ai_addr; /* storage area for this info */ memcpy(&addr->sin_addr, curr, sizeof(struct in_addr)); addr->sin_family = (CURL_SA_FAMILY_T)(he->h_addrtype); addr->sin_port = htons((unsigned short)port); break; #ifdef ENABLE_IPV6 case AF_INET6: addr6 = (void *)ai->ai_addr; /* storage area for this info */ memcpy(&addr6->sin6_addr, curr, sizeof(struct in6_addr)); addr6->sin6_family = (CURL_SA_FAMILY_T)(he->h_addrtype); addr6->sin6_port = htons((unsigned short)port); break; #endif } prevai = ai; } if(result) { Curl_freeaddrinfo(firstai); firstai = NULL; } return firstai; } struct namebuff { struct hostent hostentry; union { struct in_addr ina4; #ifdef ENABLE_IPV6 struct in6_addr ina6; #endif } addrentry; char *h_addr_list[2]; }; /* * Curl_ip2addr() * * This function takes an internet address, in binary form, as input parameter * along with its address family and the string version of the address, and it * returns a Curl_addrinfo chain filled in correctly with information for the * given address/host */ struct Curl_addrinfo * Curl_ip2addr(int af, const void *inaddr, const char *hostname, int port) { struct 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 namebuff *buf; char *addrentry; char *hoststr; size_t addrsize; DEBUGASSERT(inaddr && hostname); buf = malloc(sizeof(struct namebuff)); if(!buf) return NULL; hoststr = strdup(hostname); if(!hoststr) { free(buf); return NULL; } switch(af) { case AF_INET: addrsize = sizeof(struct in_addr); addrentry = (void *)&buf->addrentry.ina4; memcpy(addrentry, inaddr, sizeof(struct in_addr)); break; #ifdef ENABLE_IPV6 case AF_INET6: addrsize = sizeof(struct in6_addr); addrentry = (void *)&buf->addrentry.ina6; memcpy(addrentry, inaddr, sizeof(struct in6_addr)); break; #endif default: free(hoststr); free(buf); return NULL; } h = &buf->hostentry; h->h_name = hoststr; h->h_aliases = NULL; h->h_addrtype = (short)af; h->h_length = (short)addrsize; h->h_addr_list = &buf->h_addr_list[0]; h->h_addr_list[0] = addrentry; h->h_addr_list[1] = NULL; /* terminate list of entries */ #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); free(hoststr); free(buf); return ai; } /* * Given an IPv4 or IPv6 dotted string address, this converts it to a proper * allocated Curl_addrinfo struct and returns it. */ struct Curl_addrinfo *Curl_str2addr(char *address, int port) { struct in_addr in; if(Curl_inet_pton(AF_INET, address, &in) > 0) /* This is a dotted IP address 123.123.123.123-style */ return Curl_ip2addr(AF_INET, &in, address, port); #ifdef ENABLE_IPV6 { struct in6_addr in6; if(Curl_inet_pton(AF_INET6, address, &in6) > 0) /* This is a dotted IPv6 address ::1-style */ return Curl_ip2addr(AF_INET6, &in6, address, port); } #endif return NULL; /* bad input format */ } #ifdef USE_UNIX_SOCKETS /** * Given a path to a Unix domain socket, return a newly allocated Curl_addrinfo * struct initialized with this path. * Set '*longpath' to TRUE if the error is a too long path. */ struct Curl_addrinfo *Curl_unix2addr(const char *path, bool *longpath, bool abstract) { struct Curl_addrinfo *ai; struct sockaddr_un *sa_un; size_t path_len; *longpath = FALSE; ai = calloc(1, sizeof(struct Curl_addrinfo) + sizeof(struct sockaddr_un)); if(!ai) return NULL; ai->ai_addr = (void *)((char *)ai + sizeof(struct Curl_addrinfo)); sa_un = (void *) ai->ai_addr; sa_un->sun_family = AF_UNIX; /* sun_path must be able to store the NUL-terminated path */ path_len = strlen(path) + 1; if(path_len > sizeof(sa_un->sun_path)) { free(ai); *longpath = TRUE; return NULL; } ai->ai_family = AF_UNIX; ai->ai_socktype = SOCK_STREAM; /* assume reliable transport for HTTP */ ai->ai_addrlen = (curl_socklen_t) ((offsetof(struct sockaddr_un, sun_path) + path_len) & 0x7FFFFFFF); /* Abstract Unix domain socket have NULL prefix instead of suffix */ if(abstract) memcpy(sa_un->sun_path + 1, path, path_len - 1); else memcpy(sa_un->sun_path, path, path_len); /* copy NUL byte */ return ai; } #endif #if defined(CURLDEBUG) && defined(HAVE_GETADDRINFO) && \ defined(HAVE_FREEADDRINFO) /* * curl_dbg_freeaddrinfo() * * This is strictly for memory tracing and are using the same style as the * family otherwise present in memdebug.c. I put these ones here since they * require a bunch of structs I didn't want to include in memdebug.c */ void curl_dbg_freeaddrinfo(struct addrinfo *freethis, int line, const char *source) { curl_dbg_log("ADDR %s:%d freeaddrinfo(%p)\n", source, line, (void *)freethis); #ifdef USE_LWIPSOCK lwip_freeaddrinfo(freethis); #else (freeaddrinfo)(freethis); #endif } #endif /* defined(CURLDEBUG) && defined(HAVE_FREEADDRINFO) */ #if defined(CURLDEBUG) && defined(HAVE_GETADDRINFO) /* * curl_dbg_getaddrinfo() * * This is strictly for memory tracing and are using the same style as the * family otherwise present in memdebug.c. I put these ones here since they * require a bunch of structs I didn't want to include in memdebug.c */ int curl_dbg_getaddrinfo(const char *hostname, const char *service, const struct addrinfo *hints, struct addrinfo **result, int line, const char *source) { #ifdef USE_LWIPSOCK int res = lwip_getaddrinfo(hostname, service, hints, result); #else int res = (getaddrinfo)(hostname, service, hints, result); #endif if(0 == res) /* success */ curl_dbg_log("ADDR %s:%d getaddrinfo() = %p\n", source, line, (void *)*result); else curl_dbg_log("ADDR %s:%d getaddrinfo() failed\n", source, line); return res; } #endif /* defined(CURLDEBUG) && defined(HAVE_GETADDRINFO) */ #if defined(HAVE_GETADDRINFO) && defined(USE_RESOLVE_ON_IPS) /* * Work-arounds the sin6_port is always zero bug on iOS 9.3.2 and Mac OS X * 10.11.5. */ void Curl_addrinfo_set_port(struct Curl_addrinfo *addrinfo, int port) { struct Curl_addrinfo *ca; struct sockaddr_in *addr; #ifdef ENABLE_IPV6 struct sockaddr_in6 *addr6; #endif for(ca = addrinfo; ca != NULL; ca = ca->ai_next) { switch(ca->ai_family) { case AF_INET: addr = (void *)ca->ai_addr; /* storage area for this info */ addr->sin_port = htons((unsigned short)port); break; #ifdef ENABLE_IPV6 case AF_INET6: addr6 = (void *)ca->ai_addr; /* storage area for this info */ addr6->sin6_port = htons((unsigned short)port); break; #endif } } } #endif