Add missing enum files
git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@933 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Mark Spencer
parent
be6da9b8ea
commit
c58934fd46
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/*
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* ENUM support
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*
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*
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* ENUM Support for Asterisk
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*
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* Copyright (C) 2003 Digium
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*
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* Distributed under the terms of the GNU GPL
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*
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*/
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#include <string.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <resolv.h>
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#include <errno.h>
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#include <asterisk/logger.h>
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#include <asterisk/options.h>
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#include <asterisk/enum.h>
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#include <asterisk/channel.h>
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#define MAX_SIZE 4096
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#define TOPLEV "e164.arpa."
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static int skip_name(unsigned char *s, int len)
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{
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/* Shamelessly take from SER */
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int x = 0;
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while(x < len) {
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if (!*s) {
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s++;
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x++;
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break;
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}
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if (((*s) & 0xc0) == 0xc0) {
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s += 2;
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x += 2;
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break;
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}
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x += *s + 1;
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s += *s + 1;
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}
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if (x >= len)
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return -1;
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return x;
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}
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struct dn_answer {
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unsigned short rtype;
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unsigned short class;
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unsigned int ttl;
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unsigned short size;
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} __attribute__ ((__packed__));
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struct naptr {
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unsigned short order;
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unsigned short pref;
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} __attribute__ ((__packed__));
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static int parse_ie(unsigned char *data, int maxdatalen, unsigned char *src, int srclen)
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{
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int len, olen;
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len = olen = (int)src[0];
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src++;
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srclen--;
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if (len > srclen) {
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ast_log(LOG_WARNING, "Want %d, got %d\n", len, srclen);
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return -1;
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}
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if (len > maxdatalen)
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len = maxdatalen;
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memcpy(data, src, len);
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return olen + 1;
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}
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static int parse_naptr(unsigned char *dst, int dstsize, char *tech, int techsize, unsigned char *answer, int len)
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{
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unsigned char *oanswer = answer;
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unsigned char flags[80] = "";
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unsigned char services[80] = "";
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unsigned char regexp[80] = "";
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unsigned char repl[80] = "";
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int res;
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if (len < sizeof(struct naptr)) {
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printf("Length too short\n");
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return -1;
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}
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answer += sizeof(struct naptr);
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len -= sizeof(struct naptr);
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if ((res = parse_ie(flags, sizeof(flags) - 1, answer, len)) < 0) {
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ast_log(LOG_WARNING, "Failed to get flags\n");
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return -1;
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} else { answer += res; len -= res; }
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if ((res = parse_ie(services, sizeof(services) - 1, answer, len)) < 0) {
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ast_log(LOG_WARNING, "Failed to get services\n");
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return -1;
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} else { answer += res; len -= res; }
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if ((res = parse_ie(regexp, sizeof(regexp) - 1, answer, len)) < 0)
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return -1; else { answer += res; len -= res; }
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if ((res = dn_expand(oanswer,answer + len,answer, repl, sizeof(repl) - 1)) < 0) {
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ast_log(LOG_WARNING, "Failed to expand hostname\n");
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return -1;
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}
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#if 0
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printf("Flags: %s\n", flags);
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printf("Services: %s\n", services);
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printf("Regexp: %s\n", regexp);
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printf("Repl: %s\n", repl);
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#endif
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if (!strncmp(regexp, "!^.*$!", 6)) {
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if (!strncmp(services, "E2U+voice:", 10)) {
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if (regexp[strlen(regexp) - 1] == '!')
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regexp[strlen(regexp) - 1] = '\0';
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#if 0
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printf("Technology: %s\n", services + 10);
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printf("Destination: %s\n", regexp + 6);
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#endif
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strncpy(dst, regexp + 6, dstsize);
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strncpy(tech, services + 10, techsize);
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}
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} else
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ast_log(LOG_WARNING, "Non-total substitution not yet supported\n");
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return 0;
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}
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static int parse_answer(unsigned char *dst, int dstlen, unsigned char *tech, int techlen, unsigned char *answer, int len)
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{
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/*
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* This function is influenced by "ser" the SIP router.
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*/
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int x;
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int res;
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HEADER *h;
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struct dn_answer *ans;
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dst[0] = '\0';
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tech[0] = '\0';
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#if 0
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for (x=0;x<len;x++) {
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if ((answer[x] < 32) || (answer[x] > 127)) {
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if (lastlit)
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printf("\"");
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printf(" 0x%02x", answer[x]);
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lastlit = 0;
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} else {
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if (!lastlit)
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printf(" \"");
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printf("%c", answer[x]);
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lastlit = 1;
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}
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}
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printf("\n");
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#endif
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h = (HEADER *)answer;
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/* Skip over DNS header */
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answer += sizeof(HEADER);
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len -= sizeof(HEADER);
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#if 0
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printf("Query count: %d\n", ntohs(h->qdcount));
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#endif
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for (x=0;x<ntohs(h->qdcount);x++) {
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if ((res = skip_name(answer, len)) < 0) {
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ast_log(LOG_WARNING, "Couldn't skip over name\n");
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return -1;
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}
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answer += res;
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len -= res;
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answer += 4; /* Skip QCODE / QCLASS */
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len -= 4;
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if (len < 0) {
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ast_log(LOG_WARNING, "Strange query size\n");
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return -1;
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}
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}
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#if 0
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printf("Length remaining: %d\n", len);
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printf("Answer count: %d\n", ntohs(h->ancount));
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printf("Looking for %d/%d\n", C_IN, T_NAPTR);
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#endif
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for (x=0;x<ntohs(h->ancount);x++) {
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if ((res = skip_name(answer, len) < 0)) {
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ast_log(LOG_WARNING, "Failed to skip name :(\n");
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return -1;
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}
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answer += res;
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len -= res;
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/* XXX Why am I adding 2 here? XXX */
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answer += 2;
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len -= 2;
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ans = (struct dn_answer *)answer;
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answer += sizeof(struct dn_answer);
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len -= sizeof(struct dn_answer);
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if (len < 0)
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return -1;
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#if 0
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printf("Type: %d, class: %d, ttl: %d, length: %d\n", ntohs(ans->rtype), ntohs(ans->class),
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ntohl(ans->ttl), ntohs(ans->size));
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#endif
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len -= ntohs(ans->size);
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if (len < 0) {
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ast_log(LOG_WARNING, "Length exceeds frame\n");
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return -1;
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}
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if ((ntohs(ans->class) == C_IN) && (ntohs(ans->rtype) == T_NAPTR)) {
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if (parse_naptr(dst, dstlen, tech, techlen, answer, ntohs(ans->size)))
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ast_log(LOG_WARNING, "Failed to parse naptr :(\n");
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if (strlen(dst))
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return 0;
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}
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answer += ntohs(ans->size);
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}
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return 0;
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}
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int ast_get_enum(struct ast_channel *chan, const char *number, char *dst, int dstlen, char *tech, int techlen)
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{
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unsigned char answer[MAX_SIZE];
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char tmp[259 + strlen(TOPLEV)];
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int pos = strlen(number) - 1;
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int newpos=0;
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int res;
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int ret = -1;
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struct __res_state enumstate;
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res_ninit(&enumstate);
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if (chan && ast_autoservice_start(chan) < 0)
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return -1;
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if (pos > 128)
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pos = 128;
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while(pos >= 0) {
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tmp[newpos++] = number[pos--];
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tmp[newpos++] = '.';
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}
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strcpy(tmp + newpos, TOPLEV);
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#if 0
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printf("Looking for '%s'\n", tmp);
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#endif
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res = res_nsearch(&enumstate, tmp, C_IN, T_NAPTR, answer, sizeof(answer));
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if (res > 0) {
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if ((res = parse_answer(dst, dstlen, tech, techlen, answer, res))) {
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ast_log(LOG_WARNING, "Parse error returned %d\n", res);
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ret = 0;
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} else {
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ast_log(LOG_DEBUG, "Found technology '%s', destination '%s'\n", tech, dst);
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ret = 1;
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}
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} else {
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ast_log(LOG_DEBUG, "No such number found: %s (%s)\n", tmp, strerror(errno));
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ret = 0;
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}
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if (chan)
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ret |= ast_autoservice_stop(chan);
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res_nclose(&enumstate);
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return ret;
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}
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@ -0,0 +1,20 @@
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/*
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* Asterisk -- A telephony toolkit for Linux.
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*
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* ENUM support
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*
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* Copyright (C) 1999, Mark Spencer
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*
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* Mark Spencer <markster@linux-support.net>
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License
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*/
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#ifndef _ASTERISK_ENUM_H
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#define _ASTERISK_ENUM_H
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#include <asterisk/channel.h>
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/* Lookup entry in ENUM Returns 1 if found, 0 if not found, -1 on hangup */
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extern int ast_get_enum(struct ast_channel *chan, const char *number, char *location, int maxloc, char *technology, int maxtech);
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#endif
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