The Tor Browser: netwerk/test/TestDNSDaemon.cpp@ca08bd8f51b2 (annotated)

netwerk/test/TestDNSDaemon.cpp@ca08bd8f51b2 (annotated)

netwerk/test/TestDNSDaemon.cpp

Wed, 31 Dec 2014 06:55:46 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:55:46 +0100
changeset 1: ca08bd8f51b2
permissions: -rw-r--r--

Added tag TORBROWSER_REPLICA for changeset 6474c204b198

 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 #include <stdio.h>
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <sys/un.h>
 #include <unistd.h>
 #include <errno.h>
 #if defined(AIX) || defined(__linux)
 #include <sys/select.h>         // for fd_set
 #endif
 #if defined(__linux)
 // Didn't find gettdtablehi() or gettdtablesize() on linux. Using FD_SETSIZE
 #define getdtablehi() FD_SETSIZE
 #else
 #define getdtablehi() getdtablesize()
 //  If you find a system doesn't have getdtablesize try #define getdtablesize
 //  to FD_SETSIZE.  And if you encounter a system that doesn't even have
 //  FD_SETSIZE, just grab your ankles and use 255.
 #endif
 #include "nspr.h"
 #include "nsCRT.h"
 #include "unix_dns.h"
 struct sockaddr_un  unix_addr;
 int async_dns_lookup(char* hostName)
 {
   fprintf(stderr, "start async_dns_lookup\n");
   int socket_fd = socket(PF_UNIX, SOCK_STREAM, 0);
   if (socket_fd == -1) {
     fprintf(stderr, "socket returned error.\n");
     return -1;
   }
   unix_addr.sun_family = AF_UNIX;
   strcpy(unix_addr.sun_path, DNS_SOCK_NAME);
   int err = connect(socket_fd,(struct sockaddr*)&unix_addr, sizeof(unix_addr));
   if (err == -1) {
     fprintf(stderr, "connect failed (errno = %d).\n",errno);
     close(socket_fd);
     return -1;
   }
   char buf[256];
   strcpy(buf, "lookup: ");
   strcpy(&buf[8], hostName);
   err = send(socket_fd, buf, strlen(buf)+1, 0);
   if (err < 0)
     fprintf(stderr, "send(%s) returned error (errno=%d).\n",buf, errno);
   // receive 4 byte ID
   err = recv(socket_fd, buf, 256, 0);
   if (err < 0)
     fprintf(stderr, "recv() returned error (errno=%d).\n", errno);
   else
     {
       //  printf("recv() returned %d bytes.");
       int id = *(int *)buf;
       fprintf(stderr, "id: %d\n", id);
     }
   return socket_fd;
 }
 static char *
 string_trim(char *s)
 {
   char *s2;
   if (!s) return 0;
   s2 = s + strlen(s) - 1;
   while (s2 > s && (*s2 == '\n' || *s2 == '\r' || *s2 == ' ' || *s2 == '\t'))
     *s2-- = 0;
   while (*s == ' ' || *s == '\t' || *s == '\n' || *s == '\r')
     s++;
   return s;
 }
 hostent *
 bytesToHostent(char *buf)
 {
   int i;
   // int size = 0;
   int len, aliasCount, addressCount;
   int addrtype, addrlength;
   char* p = buf;
   char s[1024];
   len = *(int *)p;            // length of name
   p += sizeof(int);           // advance past name length
   memcpy(s, p, len); s[len] = 0;
   fprintf(stderr, "hostname: %s\n", s);
   p += len;                   // advance past name
   aliasCount  = *(int *)p;    // number of aliases
   p += sizeof(int);           // advance past alias count
   for (i=0; i<aliasCount; i++) {
     len = *(int *)p;          // length of alias name
     p += sizeof(int);         // advance past alias name length
     memcpy(s, p, len); s[len] = 0;
     fprintf(stderr, "alias: %s\n", s);
     p += len;                 // advance past alias name
   }
   addrtype = *(int *)p;
   fprintf(stderr, "addrtype: %d\n", addrtype);
   p += sizeof(int);
   addrlength = *(int *)p;
   fprintf(stderr, "addrlength: %d\n", addrlength);
   p += sizeof(int);
   addressCount = *(int *)p;
   p += sizeof(int);
   for (i=0; i<addressCount; i++) {
     len = *(int *)p;
     p += sizeof(int);
     fprintf(stderr, "addr len: %d\n", len);
     fprintf(stderr, "addr    : %x\n", *(int *)p);
     p += len;
   }
   // size = p - buf;
   // size += 1 + aliasCount;
   return 0;
 }
 int
 main(int argc, char* argv[])
 {
   PRStatus status;
   // launch daemon
   printf("### launch daemon...\n");
   PRProcessAttr *attributes = PR_NewProcessAttr();
   if (attributes == nullptr) {
     printf("PR_NewProcessAttr() failed.\n");
     return -1;
   }
   PRProcess *daemon = PR_CreateProcess("nsDnsAsyncLookup", nullptr, nullptr, attributes);
   if (daemon == nullptr) {
     printf("PR_CreateProcess failed.\n");
   } else {
     //    status = PR_DetachProcess(daemon);
     //if (status != 0)
     //  printf("PR_DetachProcess returned %d\n", status);
     //daemon = nullptr;
   }
   PR_DestroyProcessAttr(attributes);
   // create socket and connect to daemon
   int socket_fd = 0;
   bool notDone = true;
   char buf[1024];
   while(notDone) {
     int status = 0;
     fd_set fdset;
     FD_ZERO(&fdset);
     FD_SET(fileno(stdin), &fdset);
     if (socket_fd > 0)
       FD_SET(socket_fd, &fdset);
     status = select(getdtablehi(), &fdset, 0, 0, 0);
     if (status <= 0)
       {
 	fprintf(stderr, "%s: select() returned %d\n", argv[0], status);
 	exit(-1);
       }
     // which fd is set?
     if (FD_ISSET(fileno(stdin), &fdset))
       {
 	char *line = fgets(buf, sizeof(buf)-1, stdin);
 	line = string_trim(line);
 	if(!strcmp(line, "quit") || !strcmp(line, "exit"))
 	  {
 	    fprintf(stderr, "bye now.\n");
 	    notDone = false;
 	  }
 	else if (!strncmp(line, "abort ", 6))
 	  {
 	    // abort id
 	  }
 	else if (strchr(line, ' ') || strchr(line, '\t'))
 	  {
 	    fprintf(stderr, "%s: unrecognized command %s.\n", argv[0], line);
 	  }
 	else
 	  {
 	    fprintf(stderr, "%s: looking up %s...\n", argv[0], line);
 	    // initiate dns lookup
 	    socket_fd = async_dns_lookup(line);
 	  }
       }
     if (socket_fd && FD_ISSET(socket_fd, &fdset))
       {
 	// read from socket, parse results
 	int size = read(socket_fd, buf, 1024);
 	if (size > 0)
 	  {
 	    // parse buffer into hostent
 	    char *p = buf;
 	    fprintf(stderr, "bytes read: %d\n", size);
 	    fprintf(stderr, "response code: %d\n", *(int *)p);
 	    p += sizeof(int);
 	    for (int i=0; i < size; i++) {
 	      if (!(i%8))
 		fprintf(stderr, "\n");
 	      fprintf(stderr, "%2.2x ",(unsigned char)buf[i]);
 	    }
 	    fprintf(stderr, "\n");
 	    hostent *h;
 	    h = bytesToHostent(p);
 	  }
 	close(socket_fd);
 	socket_fd = 0;
       }
   }
   return 0;
 }
 /*
 buffer
 int nameLen;
 if (nameLen > 0)
   char [nameLen+1] name
 int aliasCount
 for each alias
   int aliasNameLen
   char [aliasNameLen+1] aliasName
 int h_addrtype
 int h_length
 int addrCount
 for each addr
   char[h_length] addr
 */

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netwerk/test/TestDNSDaemon.cpp@ca08bd8f51b2 (annotated)

netwerk/test/TestDNSDaemon.cpp