1 files changed, 357 insertions, 0 deletions
diff --git a/trunk/main/acl.c b/trunk/main/acl.c
new file mode 100644
index 000000000..ed149b963
--- /dev/null
+++ b/trunk/main/acl.c
@@ -0,0 +1,357 @@
+/*
+ * Asterisk -- An open source telephony toolkit.
+ *
+ * Copyright (C) 1999 - 2006, Digium, Inc.
+ *
+ * Mark Spencer <markster@digium.com>
+ *
+ * See http://www.asterisk.org for more information about
+ * the Asterisk project. Please do not directly contact
+ * any of the maintainers of this project for assistance;
+ * the project provides a web site, mailing lists and IRC
+ * channels for your use.
+ *
+ * This program is free software, distributed under the terms of
+ * the GNU General Public License Version 2. See the LICENSE file
+ * at the top of the source tree.
+ */
+
+/*! \file
+ *
+ * \brief Various sorts of access control
+ *
+ * \author Mark Spencer <markster@digium.com>
+ */
+
+#include "asterisk.h"
+
+ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
+
+#include "asterisk/network.h"
+
+#if defined(SOLARIS)
+#include <sys/sockio.h>
+#endif
+
+#include "asterisk/acl.h"
+#include "asterisk/channel.h"
+#include "asterisk/utils.h"
+#include "asterisk/lock.h"
+#include "asterisk/srv.h"
+
+/* Free HA structure */
+void ast_free_ha(struct ast_ha *ha)
+{
+	struct ast_ha *hal;
+	while (ha) {
+		hal = ha;
+		ha = ha->next;
+		ast_free(hal);
+	}
+}
+
+/* Copy HA structure */
+static void ast_copy_ha(struct ast_ha *from, struct ast_ha *to)
+{
+	memcpy(&to->netaddr, &from->netaddr, sizeof(from->netaddr));
+	memcpy(&to->netmask, &from->netmask, sizeof(from->netmask));
+	to->sense = from->sense;
+}
+
+/* Create duplicate of ha structure */
+static struct ast_ha *ast_duplicate_ha(struct ast_ha *original)
+{
+	struct ast_ha *new_ha;
+
+	if ((new_ha = ast_malloc(sizeof(*new_ha)))) {
+		/* Copy from original to new object */
+		ast_copy_ha(original, new_ha);
+	}
+
+	return new_ha;
+}
+
+/* Create duplicate HA link list */
+/*  Used in chan_sip2 templates */
+struct ast_ha *ast_duplicate_ha_list(struct ast_ha *original)
+{
+	struct ast_ha *start = original;
+	struct ast_ha *ret = NULL;
+	struct ast_ha *link, *prev = NULL;
+
+	while (start) {
+		link = ast_duplicate_ha(start);  /* Create copy of this object */
+		if (prev)
+			prev->next = link;		/* Link previous to this object */
+
+		if (!ret)
+			ret = link;		/* Save starting point */
+
+		start = start->next;		/* Go to next object */
+		prev = link;			/* Save pointer to this object */
+	}
+	return ret;    			/* Return start of list */
+}
+
+struct ast_ha *ast_append_ha(const char *sense, const char *stuff, struct ast_ha *path, int *error)
+{
+	struct ast_ha *ha;
+	char *nm;
+	struct ast_ha *prev = NULL;
+	struct ast_ha *ret;
+	int x;
+	char *tmp = ast_strdupa(stuff);
+
+	ret = path;
+	while (path) {
+		prev = path;
+		path = path->next;
+	}
+
+	ha = ast_malloc(sizeof(*ha));
+	if (!ha)
+		return ret;
+
+	nm = strchr(tmp, '/');
+	if (!nm) {
+		/* assume /32. Yes, htonl does not do anything for this particular mask
+		   but we better use it to show we remember about byte order */
+		ha->netmask.s_addr = htonl(0xFFFFFFFF);
+	} else {
+		*nm = '\0';
+		nm++;
+
+		if (!strchr(nm, '.')) {
+			if ((sscanf(nm, "%d", &x) == 1) && (x >= 0) && (x <= 32))
+				ha->netmask.s_addr = htonl(0xFFFFFFFF << (32 - x));
+			else {
+				ast_log(LOG_WARNING, "Invalid CIDR in %s\n", stuff);
+				ast_free(ha);
+				if (error)
+					*error = 1;
+				return ret;
+			}
+		} else if (!inet_aton(nm, &ha->netmask)) {
+			ast_log(LOG_WARNING, "Invalid mask in %s\n", stuff);
+			ast_free(ha);
+			if (error)
+				*error = 1;
+			return ret;
+		}
+	}
+
+	if (!inet_aton(tmp, &ha->netaddr)) {
+		ast_log(LOG_WARNING, "Invalid IP address in %s\n", stuff);
+		ast_free(ha);
+		if (error)
+			*error = 1;
+		return ret;
+	}
+
+	ha->netaddr.s_addr &= ha->netmask.s_addr;
+
+	ha->sense = strncasecmp(sense, "p", 1) ? AST_SENSE_DENY : AST_SENSE_ALLOW;
+
+	ha->next = NULL;
+	if (prev) {
+		prev->next = ha;
+	} else {
+		ret = ha;
+	}
+
+	ast_debug(1, "%s/%s sense %d appended to acl for peer\n", ast_strdupa(ast_inet_ntoa(ha->netaddr)), ast_strdupa(ast_inet_ntoa(ha->netmask)), ha->sense);
+
+	return ret;
+}
+
+int ast_apply_ha(struct ast_ha *ha, struct sockaddr_in *sin)
+{
+	/* Start optimistic */
+	int res = AST_SENSE_ALLOW;
+	while (ha) {
+#if 0	/* debugging code */
+		char iabuf[INET_ADDRSTRLEN];
+		char iabuf2[INET_ADDRSTRLEN];
+		/* DEBUG */
+		ast_copy_string(iabuf, ast_inet_ntoa(sin->sin_addr), sizeof(iabuf));
+		ast_copy_string(iabuf2, ast_inet_ntoa(ha->netaddr), sizeof(iabuf2));
+		ast_debug(1, "##### Testing %s with %s\n", iabuf, iabuf2);
+#endif
+		/* For each rule, if this address and the netmask = the net address
+		   apply the current rule */
+		if ((sin->sin_addr.s_addr & ha->netmask.s_addr) == ha->netaddr.s_addr)
+			res = ha->sense;
+		ha = ha->next;
+	}
+	return res;
+}
+
+int ast_get_ip_or_srv(struct sockaddr_in *sin, const char *value, const char *service)
+{
+	struct hostent *hp;
+	struct ast_hostent ahp;
+	char srv[256];
+	char host[256];
+	int tportno = ntohs(sin->sin_port);
+	if (service) {
+		snprintf(srv, sizeof(srv), "%s.%s", service, value);
+		if (ast_get_srv(NULL, host, sizeof(host), &tportno, srv) > 0) {
+			sin->sin_port = htons(tportno);
+			value = host;
+		}
+	}
+	hp = ast_gethostbyname(value, &ahp);
+	if (hp) {
+		memcpy(&sin->sin_addr, hp->h_addr, sizeof(sin->sin_addr));
+	} else {
+		ast_log(LOG_WARNING, "Unable to lookup '%s'\n", value);
+		return -1;
+	}
+	return 0;
+}
+
+struct dscp_codepoint {
+	char *name;
+	unsigned int space;
+};
+
+/* IANA registered DSCP codepoints */
+
+static const struct dscp_codepoint dscp_pool1[] = {
+	{ "CS0", 0x00 },
+	{ "CS1", 0x08 },
+	{ "CS2", 0x10 },
+	{ "CS3", 0x18 },
+	{ "CS4", 0x20 },
+	{ "CS5", 0x28 },
+	{ "CS6", 0x30 },
+	{ "CS7", 0x38 },
+	{ "AF11", 0x0A },
+	{ "AF12", 0x0C },
+	{ "AF13", 0x0E },
+	{ "AF21", 0x12 },
+	{ "AF22", 0x14 },
+	{ "AF23", 0x16 },
+	{ "AF31", 0x1A },
+	{ "AF32", 0x1C },
+	{ "AF33", 0x1E },
+	{ "AF41", 0x22 },
+	{ "AF42", 0x24 },
+	{ "AF43", 0x26 },
+	{ "EF", 0x2E },
+};
+
+int ast_str2cos(const char *value, unsigned int *cos) 
+{
+	int fval;
+	
+	if (sscanf(value, "%d", &fval) == 1) {
+		if (fval < 8) {
+    		    *cos = fval;
+		    return 0;
+		}
+	}
+	
+	return -1;
+}
+
+int ast_str2tos(const char *value, unsigned int *tos)
+{
+	int fval;
+	unsigned int x;
+
+	if (sscanf(value, "%i", &fval) == 1) {
+		*tos = fval & 0xFF;
+		return 0;
+	}
+
+	for (x = 0; x < sizeof(dscp_pool1) / sizeof(dscp_pool1[0]); x++) {
+		if (!strcasecmp(value, dscp_pool1[x].name)) {
+			*tos = dscp_pool1[x].space << 2;
+			return 0;
+		}
+	}
+
+	return -1;
+}
+
+const char *ast_tos2str(unsigned int tos)
+{
+	unsigned int x;
+
+	for (x = 0; x < sizeof(dscp_pool1) / sizeof(dscp_pool1[0]); x++) {
+		if (dscp_pool1[x].space == (tos >> 2))
+			return dscp_pool1[x].name;
+	}
+
+	return "unknown";
+}
+
+int ast_get_ip(struct sockaddr_in *sin, const char *value)
+{
+	return ast_get_ip_or_srv(sin, value, NULL);
+}
+
+int ast_ouraddrfor(struct in_addr *them, struct in_addr *us)
+{
+	int s;
+	struct sockaddr_in sin;
+	socklen_t slen;
+
+	s = socket(PF_INET, SOCK_DGRAM, 0);
+	if (s < 0) {
+		ast_log(LOG_ERROR, "Cannot create socket\n");
+		return -1;
+	}
+	sin.sin_family = AF_INET;
+	sin.sin_port = 5060;
+	sin.sin_addr = *them;
+	if (connect(s, (struct sockaddr *)&sin, sizeof(sin))) {
+		ast_log(LOG_WARNING, "Cannot connect\n");
+		close(s);
+		return -1;
+	}
+	slen = sizeof(sin);
+	if (getsockname(s, (struct sockaddr *)&sin, &slen)) {
+		ast_log(LOG_WARNING, "Cannot get socket name\n");
+		close(s);
+		return -1;
+	}
+	close(s);
+	ast_debug(3, "Found IP address for this socket\n");
+	*us = sin.sin_addr;
+	return 0;
+}
+
+int ast_find_ourip(struct in_addr *ourip, struct sockaddr_in bindaddr)
+{
+	char ourhost[MAXHOSTNAMELEN] = "";
+	struct ast_hostent ahp;
+	struct hostent *hp;
+	struct in_addr saddr;
+
+	/* just use the bind address if it is nonzero */
+	if (ntohl(bindaddr.sin_addr.s_addr)) {
+		memcpy(ourip, &bindaddr.sin_addr, sizeof(*ourip));
+		ast_debug(3, "Attached to given IP address\n");
+		return 0;
+	}
+	/* try to use our hostname */
+	if (gethostname(ourhost, sizeof(ourhost) - 1)) {
+		ast_log(LOG_WARNING, "Unable to get hostname\n");
+	} else {
+		hp = ast_gethostbyname(ourhost, &ahp);
+		if (hp) {
+			memcpy(ourip, hp->h_addr, sizeof(*ourip));
+			ast_debug(3, "Found one IP address based on local hostname %s.\n", ourhost);
+			return 0;
+		}
+	}
+	ast_debug(3, "Trying to check A.ROOT-SERVERS.NET and get our IP address for that connection\n");
+	/* A.ROOT-SERVERS.NET. */
+	if (inet_aton("198.41.0.4", &saddr) && !ast_ouraddrfor(&saddr, ourip))
+		return 0;
+	ast_debug(3, "Failed to find any IP address for us\n");
+	return -1;
+}
+