| /* |
| PostgreSQL Database Management System |
| (formerly known as Postgres, then as Postgres95) |
| |
| Portions Copyright (c) 1996-2005, The PostgreSQL Global Development Group |
| |
| Portions Copyright (c) 1994, The Regents of the University of California |
| |
| Permission to use, copy, modify, and distribute this software and its |
| documentation for any purpose, without fee, and without a written agreement |
| is hereby granted, provided that the above copyright notice and this paragraph |
| and the following two paragraphs appear in all copies. |
| |
| IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR |
| DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING |
| LOST PROFITS, ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, |
| EVEN IF THE UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF |
| SUCH DAMAGE. |
| |
| THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES, |
| INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY |
| AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS |
| ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATIONS |
| TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. |
| |
| */ |
| |
| /*------------------------------------------------------------------------- |
| * |
| * getaddrinfo.c |
| * Support getaddrinfo() on platforms that don't have it. |
| * |
| * We also supply getnameinfo() here, assuming that the platform will have |
| * it if and only if it has getaddrinfo(). If this proves false on some |
| * platform, we'll need to split this file and provide a separate configure |
| * test for getnameinfo(). |
| * |
| * Copyright (c) 2003-2007, PostgreSQL Global Development Group |
| * |
| * Copyright (C) 2007 Jeremy Allison. |
| * Modified to return multiple IPv4 addresses for Samba. |
| * |
| *------------------------------------------------------------------------- |
| */ |
| |
| #include "replace.h" |
| #include "system/network.h" |
| |
| #ifndef SMB_MALLOC |
| #define SMB_MALLOC(s) malloc(s) |
| #endif |
| |
| #ifndef SMB_STRDUP |
| #define SMB_STRDUP(s) strdup(s) |
| #endif |
| |
| static int check_hostent_err(struct hostent *hp) |
| { |
| if (!hp) { |
| switch (h_errno) { |
| case HOST_NOT_FOUND: |
| case NO_DATA: |
| return EAI_NONAME; |
| case TRY_AGAIN: |
| return EAI_AGAIN; |
| case NO_RECOVERY: |
| default: |
| return EAI_FAIL; |
| } |
| } |
| if (!hp->h_name || hp->h_addrtype != AF_INET) { |
| return EAI_FAIL; |
| } |
| return 0; |
| } |
| |
| static char *canon_name_from_hostent(struct hostent *hp, |
| int *perr) |
| { |
| char *ret = NULL; |
| |
| *perr = check_hostent_err(hp); |
| if (*perr) { |
| return NULL; |
| } |
| ret = SMB_STRDUP(hp->h_name); |
| if (!ret) { |
| *perr = EAI_MEMORY; |
| } |
| return ret; |
| } |
| |
| static char *get_my_canon_name(int *perr) |
| { |
| char name[HOST_NAME_MAX+1]; |
| |
| if (gethostname(name, HOST_NAME_MAX) == -1) { |
| *perr = EAI_FAIL; |
| return NULL; |
| } |
| /* Ensure null termination. */ |
| name[HOST_NAME_MAX] = '\0'; |
| return canon_name_from_hostent(gethostbyname(name), perr); |
| } |
| |
| static char *get_canon_name_from_addr(struct in_addr ip, |
| int *perr) |
| { |
| return canon_name_from_hostent( |
| gethostbyaddr(&ip, sizeof(ip), AF_INET), |
| perr); |
| } |
| |
| static struct addrinfo *alloc_entry(const struct addrinfo *hints, |
| struct in_addr ip, |
| unsigned short port) |
| { |
| struct sockaddr_in *psin = NULL; |
| struct addrinfo *ai = SMB_MALLOC(sizeof(*ai)); |
| |
| if (!ai) { |
| return NULL; |
| } |
| memset(ai, '\0', sizeof(*ai)); |
| |
| psin = SMB_MALLOC(sizeof(*psin)); |
| if (!psin) { |
| free(ai); |
| return NULL; |
| } |
| |
| memset(psin, '\0', sizeof(*psin)); |
| |
| psin->sin_family = AF_INET; |
| psin->sin_port = htons(port); |
| psin->sin_addr = ip; |
| |
| ai->ai_flags = 0; |
| ai->ai_family = AF_INET; |
| ai->ai_socktype = hints->ai_socktype; |
| ai->ai_protocol = hints->ai_protocol; |
| ai->ai_addrlen = sizeof(*psin); |
| ai->ai_addr = (struct sockaddr *) psin; |
| ai->ai_canonname = NULL; |
| ai->ai_next = NULL; |
| |
| return ai; |
| } |
| |
| /* |
| * get address info for a single ipv4 address. |
| * |
| * Bugs: - servname can only be a number, not text. |
| */ |
| |
| static int getaddr_info_single_addr(const char *service, |
| uint32_t addr, |
| const struct addrinfo *hints, |
| struct addrinfo **res) |
| { |
| |
| struct addrinfo *ai = NULL; |
| struct in_addr ip; |
| unsigned short port = 0; |
| |
| if (service) { |
| port = (unsigned short)atoi(service); |
| } |
| ip.s_addr = htonl(addr); |
| |
| ai = alloc_entry(hints, ip, port); |
| if (!ai) { |
| return EAI_MEMORY; |
| } |
| |
| /* If we're asked for the canonical name, |
| * make sure it returns correctly. */ |
| if (!(hints->ai_flags & AI_NUMERICSERV) && |
| hints->ai_flags & AI_CANONNAME) { |
| int err; |
| if (addr == INADDR_LOOPBACK || addr == INADDR_ANY) { |
| ai->ai_canonname = get_my_canon_name(&err); |
| } else { |
| ai->ai_canonname = |
| get_canon_name_from_addr(ip,&err); |
| } |
| if (ai->ai_canonname == NULL) { |
| freeaddrinfo(ai); |
| return err; |
| } |
| } |
| |
| *res = ai; |
| return 0; |
| } |
| |
| /* |
| * get address info for multiple ipv4 addresses. |
| * |
| * Bugs: - servname can only be a number, not text. |
| */ |
| |
| static int getaddr_info_name(const char *node, |
| const char *service, |
| const struct addrinfo *hints, |
| struct addrinfo **res) |
| { |
| struct addrinfo *listp = NULL, *prevp = NULL; |
| char **pptr = NULL; |
| int err; |
| struct hostent *hp = NULL; |
| unsigned short port = 0; |
| |
| if (service) { |
| port = (unsigned short)atoi(service); |
| } |
| |
| hp = gethostbyname(node); |
| err = check_hostent_err(hp); |
| if (err) { |
| return err; |
| } |
| |
| for(pptr = hp->h_addr_list; *pptr; pptr++) { |
| struct in_addr ip = *(struct in_addr *)*pptr; |
| struct addrinfo *ai = alloc_entry(hints, ip, port); |
| |
| if (!ai) { |
| freeaddrinfo(listp); |
| return EAI_MEMORY; |
| } |
| |
| if (!listp) { |
| listp = ai; |
| prevp = ai; |
| ai->ai_canonname = SMB_STRDUP(hp->h_name); |
| if (!ai->ai_canonname) { |
| freeaddrinfo(listp); |
| return EAI_MEMORY; |
| } |
| } else { |
| prevp->ai_next = ai; |
| prevp = ai; |
| } |
| } |
| *res = listp; |
| return 0; |
| } |
| |
| /* |
| * get address info for ipv4 sockets. |
| * |
| * Bugs: - servname can only be a number, not text. |
| */ |
| |
| int rep_getaddrinfo(const char *node, |
| const char *service, |
| const struct addrinfo * hintp, |
| struct addrinfo ** res) |
| { |
| struct addrinfo hints; |
| |
| /* Setup the hints struct. */ |
| if (hintp == NULL) { |
| memset(&hints, 0, sizeof(hints)); |
| hints.ai_family = AF_INET; |
| hints.ai_socktype = SOCK_STREAM; |
| } else { |
| memcpy(&hints, hintp, sizeof(hints)); |
| } |
| |
| if (hints.ai_family != AF_INET && hints.ai_family != AF_UNSPEC) { |
| return EAI_FAMILY; |
| } |
| |
| if (hints.ai_socktype == 0) { |
| hints.ai_socktype = SOCK_STREAM; |
| } |
| |
| if (!node && !service) { |
| return EAI_NONAME; |
| } |
| |
| if (node) { |
| if (node[0] == '\0') { |
| return getaddr_info_single_addr(service, |
| INADDR_ANY, |
| &hints, |
| res); |
| } else if (hints.ai_flags & AI_NUMERICHOST) { |
| struct in_addr ip; |
| if (!inet_aton(node, &ip)) { |
| return EAI_FAIL; |
| } |
| return getaddr_info_single_addr(service, |
| ntohl(ip.s_addr), |
| &hints, |
| res); |
| } else { |
| return getaddr_info_name(node, |
| service, |
| &hints, |
| res); |
| } |
| } else if (hints.ai_flags & AI_PASSIVE) { |
| return getaddr_info_single_addr(service, |
| INADDR_ANY, |
| &hints, |
| res); |
| } |
| return getaddr_info_single_addr(service, |
| INADDR_LOOPBACK, |
| &hints, |
| res); |
| } |
| |
| |
| void rep_freeaddrinfo(struct addrinfo *res) |
| { |
| struct addrinfo *next = NULL; |
| |
| for (;res; res = next) { |
| next = res->ai_next; |
| if (res->ai_canonname) { |
| free(res->ai_canonname); |
| } |
| if (res->ai_addr) { |
| free(res->ai_addr); |
| } |
| free(res); |
| } |
| } |
| |
| |
| const char *rep_gai_strerror(int errcode) |
| { |
| #ifdef HAVE_HSTRERROR |
| int hcode; |
| |
| switch (errcode) |
| { |
| case EAI_NONAME: |
| hcode = HOST_NOT_FOUND; |
| break; |
| case EAI_AGAIN: |
| hcode = TRY_AGAIN; |
| break; |
| case EAI_FAIL: |
| default: |
| hcode = NO_RECOVERY; |
| break; |
| } |
| |
| return hstrerror(hcode); |
| #else /* !HAVE_HSTRERROR */ |
| |
| switch (errcode) |
| { |
| case EAI_NONAME: |
| return "Unknown host"; |
| case EAI_AGAIN: |
| return "Host name lookup failure"; |
| #ifdef EAI_BADFLAGS |
| case EAI_BADFLAGS: |
| return "Invalid argument"; |
| #endif |
| #ifdef EAI_FAMILY |
| case EAI_FAMILY: |
| return "Address family not supported"; |
| #endif |
| #ifdef EAI_MEMORY |
| case EAI_MEMORY: |
| return "Not enough memory"; |
| #endif |
| #ifdef EAI_NODATA |
| case EAI_NODATA: |
| return "No host data of that type was found"; |
| #endif |
| #ifdef EAI_SERVICE |
| case EAI_SERVICE: |
| return "Class type not found"; |
| #endif |
| #ifdef EAI_SOCKTYPE |
| case EAI_SOCKTYPE: |
| return "Socket type not supported"; |
| #endif |
| default: |
| return "Unknown server error"; |
| } |
| #endif /* HAVE_HSTRERROR */ |
| } |
| |
| static int gethostnameinfo(const struct sockaddr *sa, |
| char *node, |
| size_t nodelen, |
| int flags) |
| { |
| int ret = -1; |
| char *p = NULL; |
| |
| if (!(flags & NI_NUMERICHOST)) { |
| struct hostent *hp = gethostbyaddr( |
| &((struct sockaddr_in *)sa)->sin_addr, |
| sizeof(struct in_addr), |
| sa->sa_family); |
| ret = check_hostent_err(hp); |
| if (ret == 0) { |
| /* Name looked up successfully. */ |
| ret = snprintf(node, nodelen, "%s", hp->h_name); |
| if (ret < 0 || (size_t)ret >= nodelen) { |
| return EAI_MEMORY; |
| } |
| if (flags & NI_NOFQDN) { |
| p = strchr(node,'.'); |
| if (p) { |
| *p = '\0'; |
| } |
| } |
| return 0; |
| } |
| |
| if (flags & NI_NAMEREQD) { |
| /* If we require a name and didn't get one, |
| * automatically fail. */ |
| return ret; |
| } |
| /* Otherwise just fall into the numeric host code... */ |
| } |
| p = inet_ntoa(((struct sockaddr_in *)sa)->sin_addr); |
| ret = snprintf(node, nodelen, "%s", p); |
| if (ret < 0 || (size_t)ret >= nodelen) { |
| return EAI_MEMORY; |
| } |
| return 0; |
| } |
| |
| static int getservicenameinfo(const struct sockaddr *sa, |
| char *service, |
| size_t servicelen, |
| int flags) |
| { |
| int ret = -1; |
| int port = ntohs(((struct sockaddr_in *)sa)->sin_port); |
| |
| if (!(flags & NI_NUMERICSERV)) { |
| struct servent *se = getservbyport( |
| port, |
| (flags & NI_DGRAM) ? "udp" : "tcp"); |
| if (se && se->s_name) { |
| /* Service name looked up successfully. */ |
| ret = snprintf(service, servicelen, "%s", se->s_name); |
| if (ret < 0 || (size_t)ret >= servicelen) { |
| return EAI_MEMORY; |
| } |
| return 0; |
| } |
| /* Otherwise just fall into the numeric service code... */ |
| } |
| ret = snprintf(service, servicelen, "%d", port); |
| if (ret < 0 || (size_t)ret >= servicelen) { |
| return EAI_MEMORY; |
| } |
| return 0; |
| } |
| |
| /* |
| * Convert an ipv4 address to a hostname. |
| * |
| * Bugs: - No IPv6 support. |
| */ |
| int rep_getnameinfo(const struct sockaddr *sa, socklen_t salen, |
| char *node, size_t nodelen, |
| char *service, size_t servicelen, int flags) |
| { |
| |
| /* Invalid arguments. */ |
| if (sa == NULL || (node == NULL && service == NULL)) { |
| return EAI_FAIL; |
| } |
| |
| if (sa->sa_family != AF_INET) { |
| return EAI_FAIL; |
| } |
| |
| if (salen < sizeof(struct sockaddr_in)) { |
| return EAI_FAIL; |
| } |
| |
| if (node) { |
| return gethostnameinfo(sa, node, nodelen, flags); |
| } |
| |
| if (service) { |
| return getservicenameinfo(sa, service, servicelen, flags); |
| } |
| return 0; |
| } |