Implement TIP#162

1 files changed, 266 insertions, 0 deletions

diff --git a/compat/fake-rfc2553.c b/compat/fake-rfc2553.c
new file mode 100644
index 0000000..666144f
--- /dev/null
+++ b/compat/fake-rfc2553.c
@@ -0,0 +1,266 @@
+/*
+ * Copyright (C) 2000-2003 Damien Miller.  All rights reserved.
+ * Copyright (C) 1999 WIDE Project.  All rights reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the project nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * 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 example, this routine assumes
+ * that ai_family is AF_INET. Don't use it for another purpose.
+ */
+#include "tclInt.h"
+
+TCL_DECLARE_MUTEX(netdbMutex)
+
+#ifndef HAVE_GETNAMEINFO
+#ifndef HAVE_STRLCPY
+static size_t
+strlcpy(char *dst, const char *src, size_t siz)
+{
+        char *d = dst;
+        const char *s = src;
+        size_t n = siz;
+
+        /* Copy as many bytes as will fit */
+        if (n != 0 && --n != 0) {
+                do {
+                        if ((*d++ = *s++) == 0)
+                                break;
+                } while (--n != 0);
+        }
+
+        /* Not enough room in dst, add NUL and traverse rest of src */
+        if (n == 0) {
+                if (siz != 0)
+                        *d = '\0';              /* NUL-terminate dst */
+                while (*s++)
+                        ;
+        }
+
+        return(s - src - 1);    /* count does not include NUL */
+}
+#endif
+
+int fake_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 (sa->sa_family != AF_UNSPEC && sa->sa_family != AF_INET)
+		return (EAI_FAMILY);
+	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) {
+			int len;
+			Tcl_MutexLock(&netdbMutex);
+			len = strlcpy(host, inet_ntoa(sin->sin_addr), hostlen);
+			Tcl_MutexUnlock(&netdbMutex);
+			if (len >= hostlen) {
+				return (EAI_MEMORY);
+			} else {
+				return (0);
+			}
+		} else {
+			int ret;
+			Tcl_MutexLock(&netdbMutex);
+			hp = gethostbyaddr((char *)&sin->sin_addr, 
+			    sizeof(struct in_addr), AF_INET);
+			if (hp == NULL) {
+				ret = EAI_NODATA;
+			} else if (strlcpy(host, hp->h_name, hostlen)
+				   >= hostlen) {
+				ret = EAI_MEMORY;
+			} else {
+				ret = 0;
+			}
+			Tcl_MutexUnlock(&netdbMutex);
+			return ret;
+		}
+	}
+	return (0);
+}
+#endif /* !HAVE_GETNAMEINFO */
+
+#ifndef HAVE_GAI_STRERROR
+const char *
+fake_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");
+	case EAI_FAMILY:
+		return ("ai_family not supported");
+	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
+fake_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 (hints && hints->ai_family != AF_UNSPEC &&
+	    hints->ai_family != AF_INET)
+		return (EAI_FAMILY);
+	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);
+	
+	Tcl_MutexLock(&netdbMutex);
+	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);
+				Tcl_MutexUnlock(&netdbMutex);
+				return (EAI_MEMORY);
+			}
+			if (prev)
+				prev->ai_next = cur;
+			else
+				*res = cur;
+
+			prev = cur;
+		}
+		Tcl_MutexUnlock(&netdbMutex);
+		return (0);
+	}
+	Tcl_MutexUnlock(&netdbMutex);
+	return (EAI_NODATA);
+}
+#endif /* !HAVE_GETADDRINFO */