X-Git-Url: https://www.tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=lib%2Ffake-getaddrinfo.c;fp=lib%2Ffake-getaddrinfo.c;h=a1d36b123ac7bc8e59d55957e797730a65a38529;hp=0000000000000000000000000000000000000000;hb=c4cd19935763b379e730a6fdf53dc1ca98d0b938;hpb=afabbd6b9020dd6555a7ecd320a7b3e96119d538

diff --git a/lib/fake-getaddrinfo.c b/lib/fake-getaddrinfo.c
new file mode 100644
index 00000000..a1d36b12
--- /dev/null
+++ b/lib/fake-getaddrinfo.c
@@ -0,0 +1,128 @@
+/*
+ * fake library for ssh
+ *
+ * This file includes getaddrinfo(), freeaddrinfo() and gai_strerror().
+ * These funtions are defined in rfc2133.
+ *
+ * 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.
+ */
+
+#include "config.h"
+
+#include <sys/types.h>
+#include <netinet/in.h>
+#include <sys/socket.h>
+#include <netdb.h>
+#include <string.h>
+
+#include <system.h>
+
+#include "fake-getaddrinfo.h"
+
+#ifndef HAVE_GAI_STRERROR
+char *gai_strerror(int ecode)
+{
+	switch (ecode) {
+		case EAI_NODATA:
+			return "no address associated with hostname.";
+		case EAI_MEMORY:
+			return "memory allocation failure.";
+		default:
+			return "unknown error.";
+	}
+}    
+#endif /* !HAVE_GAI_STRERROR */
+
+#ifndef HAVE_FREEADDRINFO
+void freeaddrinfo(struct addrinfo *ai)
+{
+	struct addrinfo *next;
+
+	do {
+		next = ai->ai_next;
+		free(ai);
+	} while (NULL != (ai = next));
+}
+#endif /* !HAVE_FREEADDRINFO */
+
+#ifndef HAVE_GETADDRINFO
+static struct addrinfo *malloc_ai(int port, u_long addr)
+{
+	struct addrinfo *ai;
+
+	ai = malloc(sizeof(struct addrinfo) + sizeof(struct sockaddr_in));
+	if (ai == NULL)
+		return(NULL);
+	
+	memset(ai, 0, sizeof(struct addrinfo) + 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;
+	
+	return(ai);
+}
+
+int getaddrinfo(const char *hostname, const char *servname, 
+                const struct addrinfo *hints, struct addrinfo **res)
+{
+	struct addrinfo *cur, *prev = NULL;
+	struct hostent *hp;
+	struct in_addr in;
+	int i, port;
+
+	if (servname)
+		port = htons(atoi(servname));
+	else
+		port = 0;
+
+	if (hints && hints->ai_flags & AI_PASSIVE) {
+		if (NULL != (*res = malloc_ai(port, htonl(0x00000000))))
+			return 0;
+		else
+			return EAI_MEMORY;
+	}
+		
+	if (!hostname) {
+		if (NULL != (*res = malloc_ai(port, htonl(0x7f000001))))
+			return 0;
+		else
+			return EAI_MEMORY;
+	}
+	
+	if (inet_aton(hostname, &in)) {
+		if (NULL != (*res = malloc_ai(port, in.s_addr)))
+			return 0;
+		else
+			return EAI_MEMORY;
+	}
+	
+	hp = gethostbyname(hostname);
+	if (hp && hp->h_name && hp->h_name[0] && hp->h_addr_list[0]) {
+		for (i = 0; hp->h_addr_list[i]; i++) {
+			cur = malloc_ai(port, ((struct in_addr *)hp->h_addr_list[i])->s_addr);
+			if (cur == NULL) {
+				if (*res)
+					freeaddrinfo(*res);
+				return EAI_MEMORY;
+			}
+			
+			if (prev)
+				prev->ai_next = cur;
+			else
+				*res = cur;
+
+			prev = cur;
+		}
+		return 0;
+	}
+	
+	return EAI_NODATA;
+}
+#endif /* !HAVE_GETADDRINFO */