summaryrefslogtreecommitdiffstats
path: root/lib/replace/getaddrinfo.c
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--lib/replace/getaddrinfo.c493
1 files changed, 493 insertions, 0 deletions
diff --git a/lib/replace/getaddrinfo.c b/lib/replace/getaddrinfo.c
new file mode 100644
index 0000000..8440d8e
--- /dev/null
+++ b/lib/replace/getaddrinfo.c
@@ -0,0 +1,493 @@
+/*
+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;
+ free(res->ai_canonname);
+ 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;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-18 00:45:18 +0000