Import netcat from OpenBSD 3.9-RELEASE.

1 files changed, 193 insertions, 103 deletions

diff --git a/contrib/netcat/socks.c b/contrib/netcat/socks.c
index e7d35b6..daed997 100644
--- a/contrib/netcat/socks.c
+++ b/contrib/netcat/socks.c
@@ -1,7 +1,8 @@
-/*	$OpenBSD: socks.c,v 1.9 2004/10/17 03:13:55 djm Exp $	*/
+/*	$OpenBSD: socks.c,v 1.16 2006/01/25 23:21:37 djm Exp $	*/
 
 /*
  * Copyright (c) 1999 Niklas Hallqvist.  All rights reserved.
+ * Copyright (c) 2004, 2005 Damien Miller.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -36,6 +37,9 @@
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
+#include <resolv.h>
+#include <readpassphrase.h>
+#include "atomicio.h"
 
 #define SOCKS_PORT	"1080"
 #define HTTP_PROXY_PORT	"3128"
@@ -46,57 +50,53 @@
 #define SOCKS_NOMETHOD	0xff
 #define SOCKS_CONNECT	1
 #define SOCKS_IPV4	1
+#define SOCKS_DOMAIN	3
+#define SOCKS_IPV6	4
 
+int	remote_connect(const char *, const char *, struct addrinfo);
+int	socks_connect(const char *, const char *, struct addrinfo,
+	    const char *, const char *, struct addrinfo, int,
+	    const char *);
 
-int	remote_connect(char *, char *, struct addrinfo);
-int	socks_connect(char *host, char *port, struct addrinfo hints,
-	    char *proxyhost, char *proxyport, struct addrinfo proxyhints,
-	    int socksv);
-
-static in_addr_t
-decode_addr(const char *s)
+static int
+decode_addrport(const char *h, const char *p, struct sockaddr *addr,
+    socklen_t addrlen, int v4only, int numeric)
 {
-	struct hostent *hp = gethostbyname (s);
-	struct in_addr retval;
-
-	if (hp)
-		return *(in_addr_t *)hp->h_addr_list[0];
-	if (inet_aton (s, &retval))
-		return retval.s_addr;
-	errx (1, "cannot decode address \"%s\"", s);
-}
+	int r;
+	struct addrinfo hints, *res;
 
-static in_port_t
-decode_port(const char *s)
-{
-	struct servent *sp;
-	in_port_t port;
-	char *p;
-
-	port = strtol (s, &p, 10);
-	if (s == p) {
-		sp = getservbyname (s, "tcp");
-		if (sp)
-			return sp->s_port;
+	bzero(&hints, sizeof(hints));
+	hints.ai_family = v4only ? PF_INET : PF_UNSPEC;
+	hints.ai_flags = numeric ? AI_NUMERICHOST : 0;
+	hints.ai_socktype = SOCK_STREAM;
+	r = getaddrinfo(h, p, &hints, &res);
+	/* Don't fatal when attempting to convert a numeric address */
+	if (r != 0) {
+		if (!numeric) {
+			errx(1, "getaddrinfo(\"%.64s\", \"%.64s\"): %s", h, p,
+			    gai_strerror(r));
+		}
+		return (-1);
+	}
+	if (addrlen < res->ai_addrlen) {
+		freeaddrinfo(res);
+		errx(1, "internal error: addrlen < res->ai_addrlen");
 	}
-	if (*s != '\0' && *p == '\0')
-		return htons (port);
-	errx (1, "cannot decode port \"%s\"", s);
+	memcpy(addr, res->ai_addr, res->ai_addrlen);
+	freeaddrinfo(res);
+	return (0);
 }
 
 static int
-proxy_read_line(int fd, char *buf, int bufsz)
+proxy_read_line(int fd, char *buf, size_t bufsz)
 {
-	int r, off;
+	size_t off;
 
 	for(off = 0;;) {
 		if (off >= bufsz)
 			errx(1, "proxy read too long");
-		if ((r = read(fd, buf + off, 1)) <= 0) {
-			if (r == -1 && errno == EINTR)
-				continue;
+		if (atomicio(read, fd, buf + off, 1) != 1)
 			err(1, "proxy read");
-		}
 		/* Skip CR */
 		if (buf[off] == '\r')
 			continue;
@@ -109,127 +109,217 @@ proxy_read_line(int fd, char *buf, int bufsz)
 	return (off);
 }
 
+static const char *
+getproxypass(const char *proxyuser, const char *proxyhost)
+{
+	char prompt[512];
+	static char pw[256];
+
+	snprintf(prompt, sizeof(prompt), "Proxy password for %s@%s: ",
+	   proxyuser, proxyhost);
+	if (readpassphrase(prompt, pw, sizeof(pw), RPP_REQUIRE_TTY) == NULL)
+		errx(1, "Unable to read proxy passphrase");
+	return (pw);
+}
+
 int
-socks_connect(char *host, char *port, struct addrinfo hints,
-    char *proxyhost, char *proxyport, struct addrinfo proxyhints,
-    int socksv)
+socks_connect(const char *host, const char *port,
+    struct addrinfo hints __attribute__ ((__unused__)),
+    const char *proxyhost, const char *proxyport, struct addrinfo proxyhints,
+    int socksv, const char *proxyuser)
 {
-	int proxyfd, r;
+	int proxyfd, r, authretry = 0;
+	size_t hlen, wlen;
 	unsigned char buf[1024];
-	ssize_t cnt;
-	in_addr_t serveraddr;
+	size_t cnt;
+	struct sockaddr_storage addr;
+	struct sockaddr_in *in4 = (struct sockaddr_in *)&addr;
+	struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)&addr;
 	in_port_t serverport;
+	const char *proxypass = NULL;
 
 	if (proxyport == NULL)
 		proxyport = (socksv == -1) ? HTTP_PROXY_PORT : SOCKS_PORT;
 
+	/* Abuse API to lookup port */
+	if (decode_addrport("0.0.0.0", port, (struct sockaddr *)&addr,
+	    sizeof(addr), 1, 1) == -1)
+		errx(1, "unknown port \"%.64s\"", port);
+	serverport = in4->sin_port;
+
+ again:
+	if (authretry++ > 3)
+		errx(1, "Too many authentication failures");
+
 	proxyfd = remote_connect(proxyhost, proxyport, proxyhints);
 
 	if (proxyfd < 0)
-		return -1;
-
-	serveraddr = decode_addr (host);
-	serverport = decode_port (port);
+		return (-1);
 
 	if (socksv == 5) {
+		if (decode_addrport(host, port, (struct sockaddr *)&addr,
+		    sizeof(addr), 0, 1) == -1)
+			addr.ss_family = 0; /* used in switch below */
+
 		/* Version 5, one method: no authentication */
 		buf[0] = SOCKS_V5;
 		buf[1] = 1;
 		buf[2] = SOCKS_NOAUTH;
-		cnt = write (proxyfd, buf, 3);
-		if (cnt == -1)
-			err (1, "write failed");
+		cnt = atomicio(vwrite, proxyfd, buf, 3);
 		if (cnt != 3)
-			errx (1, "short write, %d (expected 3)", cnt);
+			err(1, "write failed (%d/3)", cnt);
+
+		cnt = atomicio(read, proxyfd, buf, 2);
+		if (cnt != 2)
+			err(1, "read failed (%d/3)", cnt);
 
-		read (proxyfd, buf, 2);
 		if (buf[1] == SOCKS_NOMETHOD)
-			errx (1, "authentication method negotiation failed");
+			errx(1, "authentication method negotiation failed");
 
-		/* Version 5, connect: IPv4 address */
-		buf[0] = SOCKS_V5;
-		buf[1] = SOCKS_CONNECT;
-		buf[2] = 0;
-		buf[3] = SOCKS_IPV4;
-		memcpy (buf + 4, &serveraddr, sizeof serveraddr);
-		memcpy (buf + 8, &serverport, sizeof serverport);
-
-		/* XXX Handle short writes better */
-		cnt = write (proxyfd, buf, 10);
-		if (cnt == -1)
-			err (1, "write failed");
-		if (cnt != 10)
-			errx (1, "short write, %d (expected 10)", cnt);
+		switch (addr.ss_family) {
+		case 0:
+			/* Version 5, connect: domain name */
+
+			/* Max domain name length is 255 bytes */
+			hlen = strlen(host);
+			if (hlen > 255)
+				errx(1, "host name too long for SOCKS5");
+			buf[0] = SOCKS_V5;
+			buf[1] = SOCKS_CONNECT;
+			buf[2] = 0;
+			buf[3] = SOCKS_DOMAIN;
+			buf[4] = hlen;
+			memcpy(buf + 5, host, hlen);			
+			memcpy(buf + 5 + hlen, &serverport, sizeof serverport);
+			wlen = 7 + hlen;
+			break;
+		case AF_INET:
+			/* Version 5, connect: IPv4 address */
+			buf[0] = SOCKS_V5;
+			buf[1] = SOCKS_CONNECT;
+			buf[2] = 0;
+			buf[3] = SOCKS_IPV4;
+			memcpy(buf + 4, &in4->sin_addr, sizeof in4->sin_addr);
+			memcpy(buf + 8, &in4->sin_port, sizeof in4->sin_port);
+			wlen = 10;
+			break;
+		case AF_INET6:
+			/* Version 5, connect: IPv6 address */
+			buf[0] = SOCKS_V5;
+			buf[1] = SOCKS_CONNECT;
+			buf[2] = 0;
+			buf[3] = SOCKS_IPV6;
+			memcpy(buf + 4, &in6->sin6_addr, sizeof in6->sin6_addr);
+			memcpy(buf + 20, &in6->sin6_port,
+			    sizeof in6->sin6_port);
+			wlen = 22;
+			break;
+		default:
+			errx(1, "internal error: silly AF");
+		}
 
-		/* XXX Handle short reads better */
-		cnt = read (proxyfd, buf, sizeof buf);
-		if (cnt == -1)
-			err (1, "read failed");
+		cnt = atomicio(vwrite, proxyfd, buf, wlen);
+		if (cnt != wlen)
+			err(1, "write failed (%d/%d)", cnt, wlen);
+
+		cnt = atomicio(read, proxyfd, buf, 10);
 		if (cnt != 10)
-			errx (1, "unexpected reply size %d (expected 10)", cnt);
+			err(1, "read failed (%d/10)", cnt);
 		if (buf[1] != 0)
-			errx (1, "connection failed, SOCKS error %d", buf[1]);
+			errx(1, "connection failed, SOCKS error %d", buf[1]);
 	} else if (socksv == 4) {
+		/* This will exit on lookup failure */
+		decode_addrport(host, port, (struct sockaddr *)&addr,
+		    sizeof(addr), 1, 0);
+
 		/* Version 4 */
 		buf[0] = SOCKS_V4;
 		buf[1] = SOCKS_CONNECT;	/* connect */
-		memcpy (buf + 2, &serverport, sizeof serverport);
-		memcpy (buf + 4, &serveraddr, sizeof serveraddr);
+		memcpy(buf + 2, &in4->sin_port, sizeof in4->sin_port);
+		memcpy(buf + 4, &in4->sin_addr, sizeof in4->sin_addr);
 		buf[8] = 0;	/* empty username */
+		wlen = 9;
 
-		cnt = write (proxyfd, buf, 9);
-		if (cnt == -1)
-			err (1, "write failed");
-		if (cnt != 9)
-			errx (1, "short write, %d (expected 9)", cnt);
+		cnt = atomicio(vwrite, proxyfd, buf, wlen);
+		if (cnt != wlen)
+			err(1, "write failed (%d/%d)", cnt, wlen);
 
-		/* XXX Handle short reads better */
-		cnt = read (proxyfd, buf, 8);
-		if (cnt == -1)
-			err (1, "read failed");
+		cnt = atomicio(read, proxyfd, buf, 8);
 		if (cnt != 8)
-			errx (1, "unexpected reply size %d (expected 8)", cnt);
+			err(1, "read failed (%d/8)", cnt);
 		if (buf[1] != 90)
-			errx (1, "connection failed, SOCKS error %d", buf[1]);
+			errx(1, "connection failed, SOCKS error %d", buf[1]);
 	} else if (socksv == -1) {
 		/* HTTP proxy CONNECT */
 
 		/* Disallow bad chars in hostname */
 		if (strcspn(host, "\r\n\t []:") != strlen(host))
-			errx (1, "Invalid hostname");
+			errx(1, "Invalid hostname");
 
 		/* Try to be sane about numeric IPv6 addresses */
 		if (strchr(host, ':') != NULL) {
 			r = snprintf(buf, sizeof(buf),
-			    "CONNECT [%s]:%d HTTP/1.0\r\n\r\n",
+			    "CONNECT [%s]:%d HTTP/1.0\r\n",
 			    host, ntohs(serverport));
 		} else {
 			r = snprintf(buf, sizeof(buf),
-			    "CONNECT %s:%d HTTP/1.0\r\n\r\n",
+			    "CONNECT %s:%d HTTP/1.0\r\n",
 			    host, ntohs(serverport));
 		}
-		if (r == -1 || r >= sizeof(buf))
-			errx (1, "hostname too long");
+		if (r == -1 || (size_t)r >= sizeof(buf))
+			errx(1, "hostname too long");
 		r = strlen(buf);
 
-		/* XXX atomicio */
-		cnt = write (proxyfd, buf, r);
-		if (cnt == -1)
-			err (1, "write failed");
+		cnt = atomicio(vwrite, proxyfd, buf, r);
 		if (cnt != r)
-			errx (1, "short write, %d (expected %d)", cnt, r);
+			err(1, "write failed (%d/%d)", cnt, r);
+
+		if (authretry > 1) {
+			char resp[1024];
+
+			proxypass = getproxypass(proxyuser, proxyhost);
+			r = snprintf(buf, sizeof(buf), "%s:%s",
+			    proxyuser, proxypass);
+			if (r == -1 || (size_t)r >= sizeof(buf) ||
+			    b64_ntop(buf, strlen(buf), resp,
+			    sizeof(resp)) == -1)
+				errx(1, "Proxy username/password too long");
+			r = snprintf(buf, sizeof(buf), "Proxy-Authorization: "
+			    "Basic %s\r\n", resp);
+			if (r == -1 || (size_t)r >= sizeof(buf))
+				errx(1, "Proxy auth response too long");
+			r = strlen(buf);
+			if ((cnt = atomicio(vwrite, proxyfd, buf, r)) != r)
+				err(1, "write failed (%d/%d)", cnt, r);
+		}
+
+		/* Terminate headers */
+		if ((r = atomicio(vwrite, proxyfd, "\r\n", 2)) != 2)
+			err(1, "write failed (2/%d)", r);
+
+		/* Read status reply */
+		proxy_read_line(proxyfd, buf, sizeof(buf));
+		if (proxyuser != NULL &&
+		    strncmp(buf, "HTTP/1.0 407 ", 12) == 0) {
+			if (authretry > 1) {
+				fprintf(stderr, "Proxy authentication "
+				    "failed\n");
+			}
+			close(proxyfd);
+			goto again;
+		} else if (strncmp(buf, "HTTP/1.0 200 ", 12) != 0)
+			errx(1, "Proxy error: \"%s\"", buf);
 
-		/* Read reply */
+		/* Headers continue until we hit an empty line */
 		for (r = 0; r < HTTP_MAXHDRS; r++) {
 			proxy_read_line(proxyfd, buf, sizeof(buf));
-			if (r == 0 && strncmp(buf, "HTTP/1.0 200 ", 12) != 0)
-				errx (1, "Proxy error: \"%s\"", buf);
-			/* Discard headers until we hit an empty line */
 			if (*buf == '\0')
 				break;
 		}
+		if (*buf != '\0')
+			errx(1, "Too many proxy headers received");
 	} else
-		errx (1, "Unknown proxy protocol %d", socksv);
+		errx(1, "Unknown proxy protocol %d", socksv);
 
-	return proxyfd;
+	return (proxyfd);
 }