Add missing enum files

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@933 65c4cc65-6c06-0410-ace0-fbb531ad65f3

enum.c

+/*
+ * ENUM support
+ *
+ *
+ * ENUM Support for Asterisk
+ *
+ * Copyright (C) 2003 Digium
+ *
+ * Distributed under the terms of the GNU GPL
+ *
+ */
+
+#include <string.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <resolv.h>
+#include <errno.h>
+
+#include <asterisk/logger.h>
+#include <asterisk/options.h>
+#include <asterisk/enum.h>
+#include <asterisk/channel.h>
+
+#define MAX_SIZE 4096
+
+#define TOPLEV "e164.arpa."
+
+
+static int skip_name(unsigned char *s, int len)
+{
+	/* Shamelessly take from SER */
+	int x = 0;
+	while(x < len) {
+		if (!*s) {
+			s++;
+			x++;
+			break;
+		}
+		if (((*s) & 0xc0) == 0xc0) {
+			s += 2;
+			x += 2;
+			break;
+		}
+		x += *s + 1;
+		s += *s + 1;
+	}
+	if (x >= len)
+		return -1;
+	return x;
+}
+
+struct dn_answer {
+	unsigned short rtype;
+	unsigned short class;
+	unsigned int ttl;
+	unsigned short size;
+} __attribute__ ((__packed__));
+
+struct naptr {
+	unsigned short order;
+	unsigned short pref;
+} __attribute__ ((__packed__));
+
+static int parse_ie(unsigned char *data, int maxdatalen, unsigned char *src, int srclen)
+{
+	int len, olen;
+	len = olen = (int)src[0];
+	src++;
+	srclen--;
+	if (len > srclen) {
+		ast_log(LOG_WARNING, "Want %d, got %d\n", len, srclen);
+		return -1;
+	}
+	if (len > maxdatalen)
+		len = maxdatalen;
+	memcpy(data, src, len);
+	return olen + 1;
+}
+
+static int parse_naptr(unsigned char *dst, int dstsize, char *tech, int techsize, unsigned char *answer, int len)
+{
+	unsigned char *oanswer = answer;
+	unsigned char flags[80] = "";
+	unsigned char services[80] = "";
+	unsigned char regexp[80] = "";
+	unsigned char repl[80] = "";
+	int res;
+	
+	if (len < sizeof(struct naptr)) {
+		printf("Length too short\n");
+		return -1;
+	}
+	answer += sizeof(struct naptr);
+	len -= sizeof(struct naptr);
+	if ((res = parse_ie(flags, sizeof(flags) - 1, answer, len)) < 0) {
+		ast_log(LOG_WARNING, "Failed to get flags\n");
+		return -1; 
+	} else { answer += res; len -= res; }
+	if ((res = parse_ie(services, sizeof(services) - 1, answer, len)) < 0) {
+		ast_log(LOG_WARNING, "Failed to get services\n");
+		return -1; 
+	} else { answer += res; len -= res; }
+	if ((res = parse_ie(regexp, sizeof(regexp) - 1, answer, len)) < 0)
+		return -1; else { answer += res; len -= res; }
+	if ((res = dn_expand(oanswer,answer + len,answer, repl, sizeof(repl) - 1)) < 0) {
+		ast_log(LOG_WARNING, "Failed to expand hostname\n");
+		return -1;
+	} 
+#if 0
+	printf("Flags: %s\n", flags);
+	printf("Services: %s\n", services);
+	printf("Regexp: %s\n", regexp);
+	printf("Repl: %s\n", repl);
+#endif
+	if (!strncmp(regexp, "!^.*$!", 6)) {
+		if (!strncmp(services, "E2U+voice:", 10)) {
+			if (regexp[strlen(regexp) - 1] == '!')
+				regexp[strlen(regexp) - 1] = '\0';
+#if 0
+			printf("Technology: %s\n", services + 10);
+			printf("Destination: %s\n", regexp + 6);
+#endif
+			strncpy(dst, regexp + 6, dstsize);
+			strncpy(tech, services + 10, techsize);
+		}
+	} else
+		ast_log(LOG_WARNING, "Non-total substitution not yet supported\n");
+	return 0;
+}
+
+static int parse_answer(unsigned char *dst, int dstlen, unsigned char *tech, int techlen, unsigned char *answer, int len)
+{
+	/*
+	 * This function is influenced by "ser" the SIP router.
+	 */
+	int x;
+	int res;
+	HEADER *h;
+	struct dn_answer *ans;
+	dst[0] = '\0';
+	tech[0] = '\0';
+#if 0
+	for (x=0;x<len;x++) {
+		if ((answer[x] < 32) || (answer[x] > 127)) {
+			if (lastlit)
+				printf("\"");
+			printf(" 0x%02x", answer[x]);
+			lastlit = 0;
+		} else {
+			if (!lastlit) 
+				printf(" \"");
+			printf("%c", answer[x]);
+			lastlit = 1;
+		}
+	}
+	printf("\n");
+#endif	
+	h = (HEADER *)answer;
+	/* Skip over DNS header */
+	answer += sizeof(HEADER);
+	len -= sizeof(HEADER);
+#if 0
+	printf("Query count: %d\n", ntohs(h->qdcount));
+#endif
+	for (x=0;x<ntohs(h->qdcount);x++) {
+		if ((res = skip_name(answer, len)) < 0) {
+			ast_log(LOG_WARNING, "Couldn't skip over name\n");
+			return -1;
+		}
+		answer += res;
+		len -= res;
+		answer += 4; 	/* Skip QCODE / QCLASS */
+		len -= 4;
+		if (len < 0) {
+			ast_log(LOG_WARNING, "Strange query size\n");
+			return -1;
+		}
+	}
+#if 0
+	printf("Length remaining: %d\n", len);
+	printf("Answer count: %d\n", ntohs(h->ancount));
+	printf("Looking for %d/%d\n", C_IN, T_NAPTR);
+#endif
+	for (x=0;x<ntohs(h->ancount);x++) {
+		if ((res = skip_name(answer, len) < 0)) {
+			ast_log(LOG_WARNING, "Failed to skip name :(\n");
+			return -1;
+		}
+		answer += res;
+		len -= res;
+		/* XXX Why am I adding 2 here? XXX */
+		answer += 2;
+		len -= 2;
+		ans = (struct dn_answer *)answer;
+		answer += sizeof(struct dn_answer);
+		len -= sizeof(struct dn_answer);
+		if (len < 0)
+			return -1;
+#if 0
+		printf("Type: %d, class: %d, ttl: %d, length: %d\n", ntohs(ans->rtype), ntohs(ans->class),
+			ntohl(ans->ttl), ntohs(ans->size));
+#endif			
+		len -= ntohs(ans->size);
+		if (len < 0) {
+			ast_log(LOG_WARNING, "Length exceeds frame\n");
+			return -1;
+		}
+		if ((ntohs(ans->class) == C_IN) && (ntohs(ans->rtype) == T_NAPTR)) {
+			if (parse_naptr(dst, dstlen, tech, techlen, answer, ntohs(ans->size)))
+				ast_log(LOG_WARNING, "Failed to parse naptr :(\n");
+			if (strlen(dst))
+				return 0;
+		}
+		answer += ntohs(ans->size);
+	}
+	return 0;
+}
+
+int ast_get_enum(struct ast_channel *chan, const char *number, char *dst, int dstlen, char *tech, int techlen)
+{
+	unsigned char answer[MAX_SIZE];
+	char tmp[259 + strlen(TOPLEV)];
+	int pos = strlen(number) - 1;
+	int newpos=0;
+	int res;
+	int ret = -1;
+	struct __res_state enumstate;
+	res_ninit(&enumstate);	
+	if (chan && ast_autoservice_start(chan) < 0)
+		return -1;
+	
+	if (pos > 128)
+		pos = 128;
+	while(pos >= 0) {
+		tmp[newpos++] = number[pos--];
+		tmp[newpos++] = '.';
+	}
+	strcpy(tmp + newpos, TOPLEV);
+#if 0
+	printf("Looking for '%s'\n", tmp);
+#endif	
+	res = res_nsearch(&enumstate, tmp, C_IN, T_NAPTR, answer, sizeof(answer));
+	if (res > 0) {
+		if ((res = parse_answer(dst, dstlen, tech, techlen, answer, res))) {
+			ast_log(LOG_WARNING, "Parse error returned %d\n", res);
+			ret = 0;
+		} else {
+			ast_log(LOG_DEBUG, "Found technology '%s', destination '%s'\n", tech, dst);
+			ret = 1;
+		}
+	} else {
+		ast_log(LOG_DEBUG, "No such number found: %s (%s)\n", tmp, strerror(errno));
+		ret = 0;
+	}
+	if (chan)
+		ret |= ast_autoservice_stop(chan);
+	res_nclose(&enumstate);
+	return ret;
+}

include/asterisk/enum.h

+/*
+ * Asterisk -- A telephony toolkit for Linux.
+ *
+ * ENUM support
+ * 
+ * Copyright (C) 1999, Mark Spencer
+ *
+ * Mark Spencer <markster@linux-support.net>
+ *
+ * This program is free software, distributed under the terms of
+ * the GNU General Public License
+ */
+
+#ifndef _ASTERISK_ENUM_H
+#define _ASTERISK_ENUM_H
+#include <asterisk/channel.h>
+/* Lookup entry in ENUM Returns 1 if found, 0 if not found, -1 on hangup */
+extern int ast_get_enum(struct ast_channel *chan, const char *number, char *location, int maxloc, char *technology, int maxtech);
+
+#endif