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authorDamien Miller <djm@mindrot.org>2003-06-05 18:52:47 +1000
committerDamien Miller <djm@mindrot.org>2003-06-05 18:52:47 +1000
commitc28e38d23a3d074e02c1f63b64569a31d499a0e8 (patch)
treef3e1582ecddf28f770a1ed84c26d64177e735656 /openbsd-compat/fake-rfc2553.c
parentb95bb7f9b13905ade12cac848e34339ae8a1cc2f (diff)
- (djm) Merge all the openbsd/fake-* into fake-rfc2553.[ch]
Diffstat (limited to 'openbsd-compat/fake-rfc2553.c')
-rw-r--r--openbsd-compat/fake-rfc2553.c189
1 files changed, 189 insertions, 0 deletions
diff --git a/openbsd-compat/fake-rfc2553.c b/openbsd-compat/fake-rfc2553.c
new file mode 100644
index 00000000..ca13a40b
--- /dev/null
+++ b/openbsd-compat/fake-rfc2553.c
@@ -0,0 +1,189 @@
+/*
+ * Pseudo-implementation of RFC2553 name / address resolution functions
+ *
+ * But these functions are not implemented correctly. The minimum subset
+ * is implemented for ssh use only. For exapmle, this routine assumes
+ * that ai_family is AF_INET. Don't use it for another purpose.
+ */
+
+RCSID("$Id: fake-rfc2553.c,v 1.1 2003/06/05 08:52:48 djm Exp $");
+
+#ifndef HAVE_GETNAMEINFO
+int getnameinfo(const struct sockaddr *sa, size_t salen, char *host,
+ size_t hostlen, char *serv, size_t servlen, int flags)
+{
+ struct sockaddr_in *sin = (struct sockaddr_in *)sa;
+ struct hostent *hp;
+ char tmpserv[16];
+
+ if (serv != NULL) {
+ snprintf(tmpserv, sizeof(tmpserv), "%d", ntohs(sin->sin_port));
+ if (strlcpy(serv, tmpserv, servlen) >= servlen)
+ return (EAI_MEMORY);
+ }
+
+ if (host != NULL) {
+ if (flags & NI_NUMERICHOST) {
+ if (strlcpy(host, inet_ntoa(sin->sin_addr),
+ hostlen) >= hostlen)
+ return (EAI_MEMORY);
+ else
+ return (0);
+ } else {
+ hp = gethostbyaddr((char *)&sin->sin_addr,
+ sizeof(struct in_addr), AF_INET);
+ if (hp == NULL)
+ return (EAI_NODATA);
+
+ if (strlcpy(host, hp->h_name, hostlen) >= hostlen)
+ return (EAI_MEMORY);
+ else
+ return (0);
+ }
+ }
+ return (0);
+}
+#endif /* !HAVE_GETNAMEINFO */
+
+#ifndef HAVE_GAI_STRERROR
+char *
+gai_strerror(int err)
+{
+ switch (err) {
+ case EAI_NODATA:
+ return ("no address associated with name");
+ case EAI_MEMORY:
+ return ("memory allocation failure.");
+ case EAI_NONAME:
+ return ("nodename nor servname provided, or not known");
+ default:
+ return ("unknown/invalid error.");
+ }
+}
+#endif /* !HAVE_GAI_STRERROR */
+
+#ifndef HAVE_FREEADDRINFO
+void
+freeaddrinfo(struct addrinfo *ai)
+{
+ struct addrinfo *next;
+
+ for(; ai != NULL;) {
+ next = ai->ai_next;
+ free(ai);
+ ai = next;
+ }
+}
+#endif /* !HAVE_FREEADDRINFO */
+
+#ifndef HAVE_GETADDRINFO
+static struct
+addrinfo *malloc_ai(int port, u_long addr, const struct addrinfo *hints)
+{
+ struct addrinfo *ai;
+
+ ai = malloc(sizeof(*ai) + sizeof(struct sockaddr_in));
+ if (ai == NULL)
+ return (NULL);
+
+ memset(ai, '\0', sizeof(*ai) + sizeof(struct sockaddr_in));
+
+ ai->ai_addr = (struct sockaddr *)(ai + 1);
+ /* XXX -- ssh doesn't use sa_len */
+ ai->ai_addrlen = sizeof(struct sockaddr_in);
+ ai->ai_addr->sa_family = ai->ai_family = AF_INET;
+
+ ((struct sockaddr_in *)(ai)->ai_addr)->sin_port = port;
+ ((struct sockaddr_in *)(ai)->ai_addr)->sin_addr.s_addr = addr;
+
+ /* XXX: the following is not generally correct, but does what we want */
+ if (hints->ai_socktype)
+ ai->ai_socktype = hints->ai_socktype;
+ else
+ ai->ai_socktype = SOCK_STREAM;
+
+ if (hints->ai_protocol)
+ ai->ai_protocol = hints->ai_protocol;
+
+ return (ai);
+}
+
+int
+getaddrinfo(const char *hostname, const char *servname,
+ const struct addrinfo *hints, struct addrinfo **res)
+{
+ struct hostent *hp;
+ struct servent *sp;
+ struct in_addr in;
+ int i;
+ long int port;
+ u_long addr;
+
+ port = 0;
+ if (servname != NULL) {
+ char *cp;
+
+ port = strtol(servname, &cp, 10);
+ if (port > 0 && port <= 65535 && *cp == '\0')
+ port = htons(port);
+ else if ((sp = getservbyname(servname, NULL)) != NULL)
+ port = sp->s_port;
+ else
+ port = 0;
+ }
+
+ if (hints && hints->ai_flags & AI_PASSIVE) {
+ addr = htonl(0x00000000);
+ if (hostname && inet_aton(hostname, &in) != 0)
+ addr = in.s_addr;
+ *res = malloc_ai(port, addr, hints);
+ if (*res == NULL)
+ return (EAI_MEMORY);
+ return (0);
+ }
+
+ if (!hostname) {
+ *res = malloc_ai(port, htonl(0x7f000001), hints);
+ if (*res == NULL)
+ return (EAI_MEMORY);
+ return (0);
+ }
+
+ if (inet_aton(hostname, &in)) {
+ *res = malloc_ai(port, in.s_addr, hints);
+ if (*res == NULL)
+ return (EAI_MEMORY);
+ return (0);
+ }
+
+ /* Don't try DNS if AI_NUMERICHOST is set */
+ if (hints && hints->ai_flags & AI_NUMERICHOST)
+ return (EAI_NONAME);
+
+ hp = gethostbyname(hostname);
+ if (hp && hp->h_name && hp->h_name[0] && hp->h_addr_list[0]) {
+ struct addrinfo *cur, *prev;
+
+ cur = prev = *res = NULL;
+ for (i = 0; hp->h_addr_list[i]; i++) {
+ struct in_addr *in = (struct in_addr *)hp->h_addr_list[i];
+
+ cur = malloc_ai(port, in->s_addr, hints);
+ if (cur == NULL) {
+ if (*res != NULL)
+ freeaddrinfo(*res);
+ return (EAI_MEMORY);
+ }
+ if (prev)
+ prev->ai_next = cur;
+ else
+ *res = cur;
+
+ prev = cur;
+ }
+ return (0);
+ }
+
+ return (EAI_NODATA);
+}
+#endif /* !HAVE_GETADDRINFO */