LCOV - code coverage report
Current view: top level - source4/heimdal/lib/roken - roken_gethostby.c (source / functions) Hit Total Coverage
Test: coverage report for master 6248eab5 Lines: 0 123 0.0 %
Date: 2021-08-25 13:27:56 Functions: 0 7 0.0 %

          Line data    Source code
       1             : /*
       2             :  * Copyright (c) 1998 Kungliga Tekniska Högskolan
       3             :  * (Royal Institute of Technology, Stockholm, Sweden).
       4             :  * All rights reserved.
       5             :  *
       6             :  * Redistribution and use in source and binary forms, with or without
       7             :  * modification, are permitted provided that the following conditions
       8             :  * are met:
       9             :  *
      10             :  * 1. Redistributions of source code must retain the above copyright
      11             :  *    notice, this list of conditions and the following disclaimer.
      12             :  *
      13             :  * 2. Redistributions in binary form must reproduce the above copyright
      14             :  *    notice, this list of conditions and the following disclaimer in the
      15             :  *    documentation and/or other materials provided with the distribution.
      16             :  *
      17             :  * 3. Neither the name of the Institute nor the names of its contributors
      18             :  *    may be used to endorse or promote products derived from this software
      19             :  *    without specific prior written permission.
      20             :  *
      21             :  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
      22             :  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
      23             :  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
      24             :  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
      25             :  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
      26             :  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
      27             :  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
      28             :  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
      29             :  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
      30             :  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
      31             :  * SUCH DAMAGE.
      32             :  */
      33             : 
      34             : #include <config.h>
      35             : 
      36             : #include "roken.h"
      37             : 
      38             : #undef roken_gethostbyname
      39             : #undef roken_gethostbyaddr
      40             : 
      41             : static struct sockaddr_in dns_addr;
      42             : static char *dns_req;
      43             : 
      44             : static int
      45           0 : make_address(const char *address, struct in_addr *ip)
      46             : {
      47           0 :     if(inet_aton(address, ip) == 0){
      48             :         /* try to resolve as hostname, it might work if the address we
      49             :            are trying to lookup is local, for instance a web proxy */
      50           0 :         struct hostent *he = gethostbyname(address);
      51           0 :         if(he) {
      52           0 :             unsigned char *p = (unsigned char*)he->h_addr;
      53           0 :             ip->s_addr = (p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3];
      54             :         } else {
      55           0 :             return -1;
      56             :         }
      57             :     }
      58           0 :     return 0;
      59             : }
      60             : 
      61             : static int
      62           0 : setup_int(const char *proxy_host, short proxy_port,
      63             :           const char *dns_host, short dns_port,
      64             :           const char *dns_path)
      65             : {
      66           0 :     memset(&dns_addr, 0, sizeof(dns_addr));
      67           0 :     if(dns_req)
      68           0 :         free(dns_req);
      69           0 :     dns_req = NULL;
      70           0 :     if(proxy_host) {
      71           0 :         if(make_address(proxy_host, &dns_addr.sin_addr) != 0)
      72           0 :             return -1;
      73           0 :         dns_addr.sin_port = htons(proxy_port);
      74           0 :         if (asprintf(&dns_req, "http://%s:%d%s", dns_host, dns_port, dns_path) < 0)
      75           0 :             return -1;
      76             :     } else {
      77           0 :         if(make_address(dns_host, &dns_addr.sin_addr) != 0)
      78           0 :             return -1;
      79           0 :         dns_addr.sin_port = htons(dns_port);
      80           0 :         asprintf(&dns_req, "%s", dns_path);
      81             :     }
      82           0 :     dns_addr.sin_family = AF_INET;
      83           0 :     return 0;
      84             : }
      85             : 
      86             : static void
      87           0 : split_spec(const char *spec, char **host, int *port, char **path, int def_port)
      88             : {
      89             :     char *p;
      90           0 :     *host = strdup(spec);
      91           0 :     p = strchr(*host, ':');
      92           0 :     if(p) {
      93           0 :         *p++ = '\0';
      94           0 :         if(sscanf(p, "%d", port) != 1)
      95           0 :             *port = def_port;
      96             :     } else
      97           0 :         *port = def_port;
      98           0 :     p = strchr(p ? p : *host, '/');
      99           0 :     if(p) {
     100           0 :         if(path)
     101           0 :             *path = strdup(p);
     102           0 :         *p = '\0';
     103             :     }else
     104           0 :         if(path)
     105           0 :             *path = NULL;
     106           0 : }
     107             : 
     108             : 
     109             : ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
     110           0 : roken_gethostby_setup(const char *proxy_spec, const char *dns_spec)
     111             : {
     112           0 :     char *proxy_host = NULL;
     113           0 :     int proxy_port = 0;
     114             :     char *dns_host, *dns_path;
     115             :     int dns_port;
     116             : 
     117           0 :     int ret = -1;
     118             : 
     119           0 :     split_spec(dns_spec, &dns_host, &dns_port, &dns_path, 80);
     120           0 :     if(dns_path == NULL)
     121           0 :         goto out;
     122           0 :     if(proxy_spec)
     123           0 :         split_spec(proxy_spec, &proxy_host, &proxy_port, NULL, 80);
     124           0 :     ret = setup_int(proxy_host, proxy_port, dns_host, dns_port, dns_path);
     125           0 : out:
     126           0 :     free(proxy_host);
     127           0 :     free(dns_host);
     128           0 :     free(dns_path);
     129           0 :     return ret;
     130             : }
     131             : 
     132             : 
     133             : /* Try to lookup a name or an ip-address using http as transport
     134             :    mechanism. See the end of this file for an example program. */
     135             : static struct hostent*
     136           0 : roken_gethostby(const char *hostname)
     137             : {
     138             :     int s;
     139             :     struct sockaddr_in addr;
     140           0 :     char *request = NULL;
     141             :     char buf[1024];
     142           0 :     int offset = 0;
     143             :     int n;
     144             :     char *p, *foo;
     145             :     size_t len;
     146             : 
     147           0 :     if(dns_addr.sin_family == 0)
     148           0 :         return NULL; /* no configured host */
     149           0 :     addr = dns_addr;
     150           0 :     if (asprintf(&request, "GET %s?%s HTTP/1.0\r\n\r\n", dns_req, hostname) < 0)
     151           0 :         return NULL;
     152           0 :     if(request == NULL)
     153           0 :         return NULL;
     154           0 :     s  = socket(AF_INET, SOCK_STREAM, 0);
     155           0 :     if(s < 0) {
     156           0 :         free(request);
     157           0 :         return NULL;
     158             :     }
     159           0 :     if(connect(s, (struct sockaddr*)&addr, sizeof(addr)) < 0) {
     160           0 :         close(s);
     161           0 :         free(request);
     162           0 :         return NULL;
     163             :     }
     164             : 
     165           0 :     len = strlen(request);
     166           0 :     if(write(s, request, len) != (ssize_t)len) {
     167           0 :         close(s);
     168           0 :         free(request);
     169           0 :         return NULL;
     170             :     }
     171           0 :     free(request);
     172             :     while(1) {
     173           0 :         n = read(s, buf + offset, sizeof(buf) - offset);
     174           0 :         if(n <= 0)
     175           0 :             break;
     176           0 :         offset += n;
     177             :     }
     178           0 :     buf[offset] = '\0';
     179           0 :     close(s);
     180           0 :     p = strstr(buf, "\r\n\r\n"); /* find end of header */
     181           0 :     if(p) p += 4;
     182           0 :     else return NULL;
     183           0 :     foo = NULL;
     184           0 :     p = strtok_r(p, " \t\r\n", &foo);
     185           0 :     if(p == NULL)
     186           0 :         return NULL;
     187             :     {
     188             :         /* make a hostent to return */
     189             : #define MAX_ADDRS 16
     190             :         static struct hostent he;
     191             :         static char addrs[4 * MAX_ADDRS];
     192             :         static char *addr_list[MAX_ADDRS + 1];
     193           0 :         int num_addrs = 0;
     194             : 
     195           0 :         he.h_name = p;
     196           0 :         he.h_aliases = NULL;
     197           0 :         he.h_addrtype = AF_INET;
     198           0 :         he.h_length = 4;
     199             : 
     200           0 :         while((p = strtok_r(NULL, " \t\r\n", &foo)) && num_addrs < MAX_ADDRS) {
     201             :             struct in_addr ip;
     202           0 :             inet_aton(p, &ip);
     203           0 :             ip.s_addr = ntohl(ip.s_addr);
     204           0 :             addr_list[num_addrs] = &addrs[num_addrs * 4];
     205           0 :             addrs[num_addrs * 4 + 0] = (ip.s_addr >> 24) & 0xff;
     206           0 :             addrs[num_addrs * 4 + 1] = (ip.s_addr >> 16) & 0xff;
     207           0 :             addrs[num_addrs * 4 + 2] = (ip.s_addr >> 8) & 0xff;
     208           0 :             addrs[num_addrs * 4 + 3] = (ip.s_addr >> 0) & 0xff;
     209           0 :             addr_list[++num_addrs] = NULL;
     210             :         }
     211           0 :         he.h_addr_list = addr_list;
     212           0 :         return &he;
     213             :     }
     214             : }
     215             : 
     216             : ROKEN_LIB_FUNCTION struct hostent* ROKEN_LIB_CALL
     217           0 : roken_gethostbyname(const char *hostname)
     218             : {
     219             :     struct hostent *he;
     220           0 :     he = gethostbyname(hostname);
     221           0 :     if(he)
     222           0 :         return he;
     223           0 :     return roken_gethostby(hostname);
     224             : }
     225             : 
     226             : ROKEN_LIB_FUNCTION struct hostent* ROKEN_LIB_CALL
     227           0 : roken_gethostbyaddr(const void *addr, size_t len, int type)
     228             : {
     229             :     struct in_addr a;
     230             :     const char *p;
     231             :     struct hostent *he;
     232           0 :     he = gethostbyaddr(addr, len, type);
     233           0 :     if(he)
     234           0 :         return he;
     235           0 :     if(type != AF_INET || len != 4)
     236           0 :         return NULL;
     237           0 :     p = addr;
     238           0 :     a.s_addr = htonl((p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]);
     239           0 :     return roken_gethostby(inet_ntoa(a));
     240             : }
     241             : 
     242             : #if 0
     243             : 
     244             : /* this program can be used as a cgi `script' to lookup names and
     245             :    ip-addresses */
     246             : 
     247             : #include <stdio.h>
     248             : #include <stdlib.h>
     249             : #include <netdb.h>
     250             : #include <sys/param.h>
     251             : 
     252             : int
     253             : main(int argc, char **argv)
     254             : {
     255             :     char *query = getenv("QUERY_STRING");
     256             :     char host[MAXHOSTNAMELEN];
     257             :     int i;
     258             :     struct hostent *he;
     259             : 
     260             :     printf("Content-type: text/plain\n\n");
     261             :     if(query == NULL)
     262             :         exit(0);
     263             :     he = gethostbyname(query);
     264             :     strncpy(host, he->h_name, sizeof(host));
     265             :     host[sizeof(host) - 1] = '\0';
     266             :     he = gethostbyaddr(he->h_addr, he->h_length, AF_INET);
     267             :     printf("%s\n", he->h_name);
     268             :     for(i = 0; he->h_addr_list[i]; i++) {
     269             :         struct in_addr ip;
     270             :         unsigned char *p = (unsigned char*)he->h_addr_list[i];
     271             :         ip.s_addr = htonl((p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]);
     272             :         printf("%s\n", inet_ntoa(ip));
     273             :     }
     274             :     exit(0);
     275             : }
     276             : 
     277             : #endif

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