From 1d1eb91abab2839ad8e3cc99437b57854d37bead Mon Sep 17 00:00:00 2001
From: markster <markster@f38db490-d61c-443f-a65b-d21fe96a405b>
Date: Sun, 4 May 2003 05:52:52 +0000
Subject: Merge tilghman's updates for getourip

git-svn-id: http://svn.digium.com/svn/asterisk/trunk@958 f38db490-d61c-443f-a65b-d21fe96a405b
---
 acl.c | 103 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 103 insertions(+)

(limited to 'acl.c')

diff --git a/acl.c b/acl.c
index 6a4f4fdaa..a6c8ccb17 100755
--- a/acl.c
+++ b/acl.c
@@ -24,6 +24,10 @@
 #include <arpa/inet.h>
 #include <sys/socket.h>
 #include <netdb.h>
+#include <net/if.h>
+#include <netinet/in_systm.h>
+#include <netinet/ip.h>
+#include <sys/ioctl.h>
 
 #define AST_SENSE_DENY			0
 #define AST_SENSE_ALLOW			1
@@ -36,6 +40,14 @@ struct ast_ha {
 	struct ast_ha *next;
 };
 
+/* Default IP - if not otherwise set, don't breathe garbage */
+static struct in_addr __ourip = { (in_addr_t)0x00000000 };
+
+struct my_ifreq {
+	char ifrn_name[IFNAMSIZ];	/* Interface name, e.g. "eth0", "ppp0", etc.  */
+	struct sockaddr_in ifru_addr;
+};
+
 void ast_free_ha(struct ast_ha *ha)
 {
 	struct ast_ha *hal;
@@ -121,3 +133,94 @@ int inaddrcmp(struct sockaddr_in *sin1, struct sockaddr_in *sin2)
 	return ((sin1->sin_addr.s_addr != sin2->sin_addr.s_addr )
 			|| (sin1->sin_port != sin2->sin_port));
 }
+
+/* iface is the interface (e.g. eth0); address is the return value */
+int ast_lookup_iface(char *iface, struct in_addr *address) {
+	int mysock, res = 0;
+	struct my_ifreq ifreq;
+
+	memset(&ifreq, 0, sizeof(ifreq));
+	strncpy(ifreq.ifrn_name,iface,sizeof(ifreq.ifrn_name) - 1);
+
+	mysock = socket(PF_INET,SOCK_DGRAM,IPPROTO_IP);
+	res = ioctl(mysock,SIOCGIFADDR,&ifreq);
+
+	close(mysock);
+	if (res < 0) {
+		ast_log(LOG_WARNING, "Unable to get IP of %s: %s\n", iface, strerror(errno));
+		strncpy((char *)address,(char *)&__ourip,sizeof(__ourip));
+		return -1;
+	} else {
+		strncpy((char *)address,(char *)&ifreq.ifru_addr.sin_addr,sizeof(ifreq.ifru_addr.sin_addr));
+		return 0;
+	}
+}
+
+int ast_ouraddrfor(struct in_addr *them, struct in_addr *us)
+{
+	FILE *PROC;
+	unsigned int remote_ip;
+	int res = 1;
+	char line[256];
+	remote_ip = them->s_addr;
+	
+	PROC = fopen("/proc/net/route","r");
+	if (!PROC) {
+		bzero(us,sizeof(struct in_addr));
+		return -1;
+	}
+	/* First line contains headers */
+	fgets(line,sizeof(line),PROC);
+
+	while (!feof(PROC)) {
+		char iface[8];
+		unsigned int dest, gateway, mask;
+		int i,fieldnum;
+		char *fields[40];
+
+		fgets(line,sizeof(line),PROC);
+
+		fieldnum = 0;
+		for (i=0;i<sizeof(line);i++) {
+			char *offset;
+
+			fields[fieldnum++] = line + i;
+			offset = strchr(line + i,'\t');
+			if (offset == NULL) {
+				/* Exit loop */
+				break;
+			} else if (fieldnum >= 9) {
+				/* Short-circuit: can't break at 8, since the end of field 7 is figured when fieldnum=8 */
+				break;
+			} else {
+				*offset = '\0';
+				i = offset - line;
+			}
+		}
+
+		sscanf(fields[0],"%s",iface);
+		sscanf(fields[1],"%x",&dest);
+		sscanf(fields[2],"%x",&gateway);
+		sscanf(fields[7],"%x",&mask);
+#if 0
+		printf("Addr: %s %08x Dest: %08x Mask: %08x\n", inet_ntoa(*them), remote_ip, dest, mask);
+#endif		
+		/* Looks simple, but here is the magic */
+		if (((remote_ip & mask) ^ dest) == 0) {
+			res = ast_lookup_iface(iface,us);
+			break;
+		}
+	}
+	fclose(PROC);
+	if (res == 1) {
+		ast_log(LOG_WARNING, "Yikes!  No default route?!!\n");
+		bzero(us,sizeof(struct in_addr));
+		return -2;
+	} else if (res) {
+		/* We've already warned in subroutine */
+		return -1;
+ 	}
+	return 0;
+}
+
+
-- 
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