Annotation of src/usr.bin/nc/socks.c, Revision 1.9
1.9 ! djm 1: /* $OpenBSD: socks.c,v 1.8 2003/07/07 21:36:23 deraadt Exp $ */
1.1 jakob 2:
3: /*
4: * Copyright (c) 1999 Niklas Hallqvist. 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: * 1. Redistributions of source code must retain the above copyright
10: * notice, this list of conditions and the following disclaimer.
11: * 2. Redistributions in binary form must reproduce the above copyright
12: * notice, this list of conditions and the following disclaimer in the
13: * documentation and/or other materials provided with the distribution.
14: *
15: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25: */
26:
27: #include <sys/types.h>
28: #include <sys/socket.h>
29: #include <netinet/in.h>
30: #include <arpa/inet.h>
31:
32: #include <err.h>
1.9 ! djm 33: #include <errno.h>
1.1 jakob 34: #include <netdb.h>
35: #include <stdio.h>
36: #include <stdlib.h>
37: #include <string.h>
38: #include <unistd.h>
39:
40: #define SOCKS_PORT "1080"
1.9 ! djm 41: #define HTTP_PROXY_PORT "3128"
! 42: #define HTTP_MAXHDRS 64
1.5 markus 43: #define SOCKS_V5 5
44: #define SOCKS_V4 4
1.1 jakob 45: #define SOCKS_NOAUTH 0
46: #define SOCKS_NOMETHOD 0xff
47: #define SOCKS_CONNECT 1
48: #define SOCKS_IPV4 1
1.9 ! djm 49:
1.4 ericj 50:
51: int remote_connect(char *, char *, struct addrinfo);
1.8 deraadt 52: int socks_connect(char *host, char *port, struct addrinfo hints,
53: char *proxyhost, char *proxyport, struct addrinfo proxyhints,
54: int socksv);
1.1 jakob 55:
56: static in_addr_t
1.8 deraadt 57: decode_addr(const char *s)
1.1 jakob 58: {
59: struct hostent *hp = gethostbyname (s);
60: struct in_addr retval;
61:
62: if (hp)
63: return *(in_addr_t *)hp->h_addr_list[0];
64: if (inet_aton (s, &retval))
65: return retval.s_addr;
66: errx (1, "cannot decode address \"%s\"", s);
67: }
68:
69: static in_port_t
1.8 deraadt 70: decode_port(const char *s)
1.1 jakob 71: {
72: struct servent *sp;
73: in_port_t port;
74: char *p;
75:
76: port = strtol (s, &p, 10);
77: if (s == p) {
78: sp = getservbyname (s, "tcp");
79: if (sp)
80: return sp->s_port;
81: }
82: if (*s != '\0' && *p == '\0')
83: return htons (port);
84: errx (1, "cannot decode port \"%s\"", s);
85: }
86:
1.9 ! djm 87: static int
! 88: proxy_read_line(int fd, char *buf, int bufsz)
! 89: {
! 90: int r, off;
! 91:
! 92: for(off = 0;;) {
! 93: if (off >= bufsz)
! 94: errx(1, "proxy read too long");
! 95: if ((r = read(fd, buf + off, 1)) <= 0) {
! 96: if (r == -1 && errno == EINTR)
! 97: continue;
! 98: err(1, "proxy read");
! 99: }
! 100: /* Skip CR */
! 101: if (buf[off] == '\r')
! 102: continue;
! 103: if (buf[off] == '\n') {
! 104: buf[off] = '\0';
! 105: break;
! 106: }
! 107: off++;
! 108: }
! 109: return (off);
! 110: }
! 111:
1.1 jakob 112: int
1.8 deraadt 113: socks_connect(char *host, char *port, struct addrinfo hints,
1.5 markus 114: char *proxyhost, char *proxyport, struct addrinfo proxyhints,
115: int socksv)
1.1 jakob 116: {
1.9 ! djm 117: int proxyfd, r;
! 118: unsigned char buf[1024];
1.1 jakob 119: ssize_t cnt;
120: in_addr_t serveraddr;
121: in_port_t serverport;
122:
1.9 ! djm 123: if (proxyport == NULL)
! 124: proxyport = (socksv == -1) ? HTTP_PROXY_PORT : SOCKS_PORT;
! 125:
! 126: proxyfd = remote_connect(proxyhost, proxyport, proxyhints);
1.1 jakob 127:
1.6 stevesk 128: if (proxyfd < 0)
1.1 jakob 129: return -1;
130:
131: serveraddr = decode_addr (host);
132: serverport = decode_port (port);
133:
1.5 markus 134: if (socksv == 5) {
135: /* Version 5, one method: no authentication */
136: buf[0] = SOCKS_V5;
137: buf[1] = 1;
138: buf[2] = SOCKS_NOAUTH;
139: cnt = write (proxyfd, buf, 3);
140: if (cnt == -1)
141: err (1, "write failed");
142: if (cnt != 3)
143: errx (1, "short write, %d (expected 3)", cnt);
144:
145: read (proxyfd, buf, 2);
146: if (buf[1] == SOCKS_NOMETHOD)
147: errx (1, "authentication method negotiation failed");
148:
149: /* Version 5, connect: IPv4 address */
150: buf[0] = SOCKS_V5;
151: buf[1] = SOCKS_CONNECT;
152: buf[2] = 0;
153: buf[3] = SOCKS_IPV4;
154: memcpy (buf + 4, &serveraddr, sizeof serveraddr);
155: memcpy (buf + 8, &serverport, sizeof serverport);
156:
157: /* XXX Handle short writes better */
158: cnt = write (proxyfd, buf, 10);
159: if (cnt == -1)
160: err (1, "write failed");
161: if (cnt != 10)
162: errx (1, "short write, %d (expected 10)", cnt);
163:
164: /* XXX Handle short reads better */
165: cnt = read (proxyfd, buf, sizeof buf);
166: if (cnt == -1)
167: err (1, "read failed");
168: if (cnt != 10)
169: errx (1, "unexpected reply size %d (expected 10)", cnt);
170: if (buf[1] != 0)
171: errx (1, "connection failed, SOCKS error %d", buf[1]);
1.9 ! djm 172: } else if (socksv == 4) {
1.5 markus 173: /* Version 4 */
174: buf[0] = SOCKS_V4;
175: buf[1] = SOCKS_CONNECT; /* connect */
176: memcpy (buf + 2, &serverport, sizeof serverport);
177: memcpy (buf + 4, &serveraddr, sizeof serveraddr);
178: buf[8] = 0; /* empty username */
179:
180: cnt = write (proxyfd, buf, 9);
181: if (cnt == -1)
182: err (1, "write failed");
183: if (cnt != 9)
184: errx (1, "short write, %d (expected 9)", cnt);
185:
186: /* XXX Handle short reads better */
187: cnt = read (proxyfd, buf, 8);
188: if (cnt == -1)
189: err (1, "read failed");
190: if (cnt != 8)
191: errx (1, "unexpected reply size %d (expected 8)", cnt);
192: if (buf[1] != 90)
193: errx (1, "connection failed, SOCKS error %d", buf[1]);
1.9 ! djm 194: } else if (socksv == -1) {
! 195: /* HTTP proxy CONNECT */
! 196:
! 197: /* Disallow bad chars in hostname */
! 198: if (strcspn(host, "\r\n\t []:") != strlen(host))
! 199: errx (1, "Invalid hostname");
! 200:
! 201: /* Try to be sane about numeric IPv6 addresses */
! 202: if (strchr(host, ':') != NULL) {
! 203: r = snprintf(buf, sizeof(buf),
! 204: "CONNECT [%s]:%d HTTP/1.0\r\n\r\n",
! 205: host, ntohs(serverport));
! 206: } else {
! 207: r = snprintf(buf, sizeof(buf),
! 208: "CONNECT %s:%d HTTP/1.0\r\n\r\n",
! 209: host, ntohs(serverport));
! 210: }
! 211: if (r == -1 || r >= sizeof(buf))
! 212: errx (1, "hostname too long");
! 213: r = strlen(buf);
! 214:
! 215: /* XXX atomicio */
! 216: cnt = write (proxyfd, buf, r);
! 217: if (cnt == -1)
! 218: err (1, "write failed");
! 219: if (cnt != r)
! 220: errx (1, "short write, %d (expected %d)", cnt, r);
! 221:
! 222: /* Read reply */
! 223: for (r = 0; r < HTTP_MAXHDRS; r++) {
! 224: proxy_read_line(proxyfd, buf, sizeof(buf));
! 225: if (r == 0 && strncmp(buf, "HTTP/1.0 200 ", 12) != 0)
! 226: errx (1, "Proxy error: \"%s\"", buf);
! 227: /* Discard headers until we hit an empty line */
! 228: if (*buf == '\0')
! 229: break;
! 230: }
! 231: } else
! 232: errx (1, "Unknown proxy protocol %d", socksv);
1.1 jakob 233:
234: return proxyfd;
235: }
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