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- /* Copyright 2004 Nick Mathewson */
- /* See LICENSE for licensing information */
- /* $Id$ */
- #include "orconfig.h"
- #include "../common/compat.h"
- #include "../common/util.h"
- #include "../common/log.h"
- #include <stdio.h>
- #include <stdlib.h>
- #include <stdarg.h>
- #include <string.h>
- #include <assert.h>
- #ifdef HAVE_NETINET_IN_H
- #include <netinet/in.h>
- #endif
- #ifdef HAVE_ARPA_INET_H
- #include <arpa/inet.h>
- #endif
- #ifdef HAVE_SYS_SOCKET_H
- #include <sys/socket.h>
- #endif
- #ifdef HAVE_SYS_TYPES_H
- #include <sys/types.h> /* Must be included before sys/stat.h for Ultrix */
- #endif
- #ifdef HAVE_ERRNO_H
- #include <errno.h>
- #endif
- #ifdef MS_WINDOWS
- #if (_MSC_VER <= 1300)
- #include <winsock.h>
- #else
- #include <winsock2.h>
- #include <ws2tcpip.h>
- #endif
- #endif
- #define RESPONSE_LEN 8
- #define log_sock_error(act, _s) \
- do { log_fn(LOG_ERR, "Error while %s: %s", act, \
- tor_socket_strerror(tor_socket_errno(_s))); } while(0)
- static int
- build_socks4a_resolve_request(char **out,
- const char *username,
- const char *hostname)
- {
- size_t len;
- tor_assert(out);
- tor_assert(username);
- tor_assert(hostname);
- len = 8 + strlen(username) + 1 + strlen(hostname) + 1;
- *out = tor_malloc(len);
- (*out)[0] = 4; /* SOCKS version 4 */
- (*out)[1] = 0xF0; /* Command: resolve. */
- set_uint16((*out)+2, htons(0)); /* port: 0. */
- set_uint32((*out)+4, htonl(0x00000001u)); /* addr: 0.0.0.1 */
- strcpy((*out)+8, username);
- strcpy((*out)+8+strlen(username)+1, hostname);
- return len;
- }
- static int
- parse_socks4a_resolve_response(const char *response, size_t len,
- uint32_t *addr_out)
- {
- uint8_t status;
- tor_assert(response);
- tor_assert(addr_out);
- if (len < RESPONSE_LEN)
- return -1;
- if (((uint8_t)response[0])!=0) /* version: 0 */
- return -1;
- status = (uint8_t)response[1];
- if (get_uint16(response+2)!=0) /* port: 0 */
- return -1;
- if (status != 90)
- return -1;
- *addr_out = ntohl(get_uint32(response+4));
- return 0;
- }
- static int
- do_resolve(const char *hostname, uint32_t sockshost, uint16_t socksport,
- uint32_t *result_addr)
- {
- int s;
- struct sockaddr_in socksaddr;
- char *req, *cp;
- int r, len;
- char response_buf[RESPONSE_LEN];
- tor_assert(hostname);
- tor_assert(result_addr);
- s = socket(PF_INET,SOCK_STREAM,IPPROTO_TCP);
- if (s<0) {
- log_sock_error("creating_socket", -1);
- return -1;
- }
- memset(&socksaddr, 0, sizeof(socksaddr));
- socksaddr.sin_family = AF_INET;
- socksaddr.sin_port = htons(socksport);
- socksaddr.sin_addr.s_addr = htonl(sockshost);
- if (connect(s, (struct sockaddr*)&socksaddr, sizeof(socksaddr))) {
- log_sock_error("connecting to SOCKS host", s);
- return -1;
- }
- if ((len = build_socks4a_resolve_request(&req, "", hostname))<0) {
- log_fn(LOG_ERR, "Error generating SOCKS request");
- return -1;
- }
- cp = req;
- while (len) {
- r = send(s, cp, len, 0);
- if (r<0) {
- log_sock_error("sending SOCKS request", s);
- tor_free(req);
- return -1;
- }
- len -= r;
- cp += r;
- }
- tor_free(req);
- len = 0;
- while (len < RESPONSE_LEN) {
- r = recv(s, response_buf+len, RESPONSE_LEN-len, 0);
- if (r<0) {
- log_sock_error("reading SOCKS response", s);
- return -1;
- }
- len += r;
- }
- if (parse_socks4a_resolve_response(response_buf, RESPONSE_LEN,result_addr)<0){
- log_fn(LOG_ERR, "Error parsing SOCKS response");
- return -1;
- }
- return 0;
- }
- static void
- usage(void)
- {
- puts("Syntax: tor-resolve [-v] hostname [sockshost:socksport]");
- exit(1);
- }
- int
- main(int argc, char **argv)
- {
- uint32_t sockshost;
- uint16_t socksport;
- char **arg;
- int n_args;
- struct in_addr a;
- uint32_t result;
- arg = &argv[1];
- n_args = argc-1;
- if (argc < 2)
- usage();
- if (!strcmp("-v", arg[0])) {
- add_stream_log(LOG_DEBUG, LOG_ERR, "<stderr>", stderr);
- ++arg; --n_args;
- } else {
- add_stream_log(LOG_WARN, LOG_ERR, "<stderr>", stderr);
- }
- if (n_args == 1) {
- log_fn(LOG_DEBUG, "defaulting to localhost:9050");
- sockshost = 0x7f000001u; /* localhost */
- socksport = 9050; /* 9050 */
- } else if (n_args == 2) {
- if (parse_addr_port(arg[1], NULL, &sockshost, &socksport)<0) {
- fprintf(stderr, "Couldn't parse/resolve address %s", arg[1]);
- return 1;
- }
- if (socksport == 0) {
- log_fn(LOG_DEBUG, "defaulting to port 9050");
- socksport = 9050;
- }
- } else {
- usage();
- }
- if (do_resolve(arg[0], sockshost, socksport, &result))
- return 1;
- a.s_addr = htonl(result);
- printf("%s\n", inet_ntoa(a));
- return 0;
- }
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