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ucat.c
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// vim:set ts=4 sw=4 ai:
/*
* Copyright (c) 2010-2013 BitTorrent, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <poll.h>
#include <netdb.h>
#include <signal.h>
#ifdef __linux__
#include <linux/errqueue.h>
#include <netinet/ip_icmp.h>
#endif
#include "utp.h"
// options
int o_debug;
char *o_local_address, *o_local_port,
*o_remote_address, *o_remote_port;
int o_listen;
int o_buf_size = 4096;
int o_numeric;
utp_context *ctx;
utp_socket *s;
int fd;
int buf_len = 0;
unsigned char *buf, *p;
int eof_flag, utp_eof_flag, utp_shutdown_flag, quit_flag, exit_code;
void die(char *fmt, ...)
{
va_list ap;
fflush(stdout);
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
exit(1);
}
void debug(char *fmt, ...)
{
va_list ap;
if (o_debug) {
fflush(stdout);
fprintf(stderr, "debug: ");
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
fflush(stderr);
}
}
void pdie(char *err)
{
debug("errno %d\n", errno);
fflush(stdout);
perror(err);
exit(1);
}
void hexdump(const void *p, size_t len)
{
int count = 1;
while (len--) {
if (count == 1)
fprintf(stderr, " %p: ", p);
fprintf(stderr, " %02x", *(unsigned char*)p++ & 0xff);
if (count++ == 16) {
fprintf(stderr, "\n");
count = 1;
}
}
if (count != 1)
fprintf(stderr, "\n");
}
void handler(int number)
{
debug("caught signal\n");
if (s)
utp_close(s);
quit_flag = 1;
exit_code++;
}
void write_data(void)
{
if (! s)
goto out;
while (p < buf+buf_len) {
size_t sent;
sent = utp_write(s, p, buf+buf_len-p);
if (sent == 0) {
debug("socket no longer writable\n");
return;
}
p += sent;
if (p == buf+buf_len) {
debug("wrote %zd bytes; buffer now empty\n", sent);
p = buf;
buf_len = 0;
}
else
debug("wrote %zd bytes; %d bytes left in buffer\n", sent, buf+buf_len-p);
}
out:
if (buf_len == 0 && eof_flag) {
if (s) {
debug("Buffer empty, and previously found EOF. Shutdown socket\n");
utp_shutdown_flag = 1;
if (!utp_eof_flag) {
utp_shutdown(s, SHUT_WR);
} else {
utp_close(s);
}
}
else {
quit_flag = 1;
}
}
}
uint64 callback_on_read(utp_callback_arguments *a)
{
const unsigned char *p;
ssize_t len, left;
left = a->len;
p = a->buf;
while (left) {
len = write(STDOUT_FILENO, p, left);
left -= len;
p += len;
debug("Wrote %d bytes, %d left\n", len, left);
}
utp_read_drained(a->socket);
return 0;
}
uint64 callback_on_firewall(utp_callback_arguments *a)
{
if (! o_listen) {
debug("Firewalling unexpected inbound connection in non-listen mode\n");
return 1;
}
if (s) {
debug("Firewalling unexpected second inbound connection\n");
return 1;
}
debug("Firewall allowing inbound connection\n");
return 0;
}
uint64 callback_on_accept(utp_callback_arguments *a)
{
assert(!s);
s = a->socket;
debug("Accepted inbound socket %p\n", s);
write_data();
return 0;
}
uint64 callback_on_error(utp_callback_arguments *a)
{
fprintf(stderr, "Error: %s\n", utp_error_code_names[a->error_code]);
utp_close(s);
s = NULL;
quit_flag = 1;
exit_code++;
return 0;
}
uint64 callback_on_state_change(utp_callback_arguments *a)
{
debug("state %d: %s\n", a->state, utp_state_names[a->state]);
utp_socket_stats *stats;
switch (a->state) {
case UTP_STATE_CONNECT:
case UTP_STATE_WRITABLE:
write_data();
break;
case UTP_STATE_EOF:
debug("Received EOF from socket\n");
utp_eof_flag = 1;
if (utp_shutdown_flag) {
utp_close(a->socket);
}
break;
case UTP_STATE_DESTROYING:
debug("UTP socket is being destroyed; exiting\n");
stats = utp_get_stats(a->socket);
if (stats) {
debug("Socket Statistics:\n");
debug(" Bytes sent: %d\n", stats->nbytes_xmit);
debug(" Bytes received: %d\n", stats->nbytes_recv);
debug(" Packets received: %d\n", stats->nrecv);
debug(" Packets sent: %d\n", stats->nxmit);
debug(" Duplicate receives: %d\n", stats->nduprecv);
debug(" Retransmits: %d\n", stats->rexmit);
debug(" Fast Retransmits: %d\n", stats->fastrexmit);
debug(" Best guess at MTU: %d\n", stats->mtu_guess);
}
else {
debug("No socket statistics available\n");
}
s = NULL;
quit_flag = 1;
break;
}
return 0;
}
uint64 callback_sendto(utp_callback_arguments *a)
{
struct sockaddr_in *sin = (struct sockaddr_in *) a->address;
debug("sendto: %zd byte packet to %s:%d%s\n", a->len, inet_ntoa(sin->sin_addr), ntohs(sin->sin_port),
(a->flags & UTP_UDP_DONTFRAG) ? " (DF bit requested, but not yet implemented)" : "");
if (o_debug >= 3)
hexdump(a->buf, a->len);
sendto(fd, a->buf, a->len, 0, a->address, a->address_len);
return 0;
}
uint64 callback_log(utp_callback_arguments *a)
{
fprintf(stderr, "log: %s\n", a->buf);
return 0;
}
void setup(void)
{
struct addrinfo hints, *res;
struct sockaddr_in sin, *sinp;
int error;
struct sigaction sigIntHandler;
sigIntHandler.sa_handler = handler;
sigemptyset(&sigIntHandler.sa_mask);
sigIntHandler.sa_flags = 0;
sigaction(SIGINT, &sigIntHandler, NULL);
p = buf = malloc(o_buf_size);
if (!buf)
pdie("malloc");
debug("Allocatd %d buffer\n", o_buf_size);
fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (fd < 0)
pdie("socket");
#ifdef __linux__
int on = 1;
if (setsockopt(fd, SOL_IP, IP_RECVERR, &on, sizeof(on)) != 0)
pdie("setsockopt");
#endif
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_INET;
hints.ai_socktype = SOCK_DGRAM;
hints.ai_protocol = IPPROTO_UDP;
if (o_numeric)
hints.ai_flags |= AI_NUMERICHOST;
if ((error = getaddrinfo(o_local_address, o_local_port, &hints, &res)))
die("getaddrinfo: %s\n", gai_strerror(error));
if (bind(fd, res->ai_addr, res->ai_addrlen) != 0)
pdie("bind");
freeaddrinfo(res);
socklen_t len = sizeof(sin);
if (getsockname(fd, (struct sockaddr *) &sin, &len) != 0)
pdie("getsockname");
debug("Bound to local %s:%d\n", inet_ntoa(sin.sin_addr), ntohs(sin.sin_port));
ctx = utp_init(2);
assert(ctx);
debug("UTP context %p\n", ctx);
utp_set_callback(ctx, UTP_LOG, &callback_log);
utp_set_callback(ctx, UTP_SENDTO, &callback_sendto);
utp_set_callback(ctx, UTP_ON_ERROR, &callback_on_error);
utp_set_callback(ctx, UTP_ON_STATE_CHANGE, &callback_on_state_change);
utp_set_callback(ctx, UTP_ON_READ, &callback_on_read);
utp_set_callback(ctx, UTP_ON_FIREWALL, &callback_on_firewall);
utp_set_callback(ctx, UTP_ON_ACCEPT, &callback_on_accept);
if (o_debug >= 2) {
utp_context_set_option(ctx, UTP_LOG_NORMAL, 1);
utp_context_set_option(ctx, UTP_LOG_MTU, 1);
utp_context_set_option(ctx, UTP_LOG_DEBUG, 1);
}
if (! o_listen) {
s = utp_create_socket(ctx);
assert(s);
debug("UTP socket %p\n", s);
if ((error = getaddrinfo(o_remote_address, o_remote_port, &hints, &res)))
die("getaddrinfo: %s\n", gai_strerror(error));
sinp = (struct sockaddr_in *)res->ai_addr;
debug("Connecting to %s:%d\n", inet_ntoa(sinp->sin_addr), ntohs(sinp->sin_port));
utp_connect(s, res->ai_addr, res->ai_addrlen);
freeaddrinfo(res);
}
}
#ifdef __linux__
void handle_icmp()
{
while (1) {
unsigned char vec_buf[4096], ancillary_buf[4096];
struct iovec iov = { vec_buf, sizeof(vec_buf) };
struct sockaddr_in remote;
struct msghdr msg;
ssize_t len;
struct cmsghdr *cmsg;
struct sock_extended_err *e;
struct sockaddr *icmp_addr;
struct sockaddr_in *icmp_sin;
memset(&msg, 0, sizeof(msg));
msg.msg_name = &remote;
msg.msg_namelen = sizeof(remote);
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
msg.msg_flags = 0;
msg.msg_control = ancillary_buf;
msg.msg_controllen = sizeof(ancillary_buf);
len = recvmsg(fd, &msg, MSG_ERRQUEUE | MSG_DONTWAIT);
if (len < 0) {
if (errno == EAGAIN || errno == EWOULDBLOCK)
break;
else
pdie("recvmsg");
}
for (cmsg = CMSG_FIRSTHDR(&msg);
cmsg;
cmsg = CMSG_NXTHDR(&msg, cmsg))
{
if (cmsg->cmsg_type != IP_RECVERR) {
debug("Unhandled errqueue type: %d\n", cmsg->cmsg_type);
continue;
}
if (cmsg->cmsg_level != SOL_IP) {
debug("Unhandled errqueue level: %d\n", cmsg->cmsg_level);
continue;
}
debug("errqueue: IP_RECVERR, SOL_IP, len %zd\n", cmsg->cmsg_len);
if (remote.sin_family != AF_INET) {
debug("Address family is %d, not AF_INET? Ignoring\n", remote.sin_family);
continue;
}
debug("Remote host: %s:%d\n", inet_ntoa(remote.sin_addr), ntohs(remote.sin_port));
e = (struct sock_extended_err *) CMSG_DATA(cmsg);
if (!e) {
debug("errqueue: sock_extended_err is NULL?\n");
continue;
}
if (e->ee_origin != SO_EE_ORIGIN_ICMP) {
debug("errqueue: Unexpected origin: %d\n", e->ee_origin);
continue;
}
debug(" ee_errno: %d\n", e->ee_errno);
debug(" ee_origin: %d\n", e->ee_origin);
debug(" ee_type: %d\n", e->ee_type);
debug(" ee_code: %d\n", e->ee_code);
debug(" ee_info: %d\n", e->ee_info); // discovered MTU for EMSGSIZE errors
debug(" ee_data: %d\n", e->ee_data);
// "Node that caused the error"
// "Node that generated the error"
icmp_addr = (struct sockaddr *) SO_EE_OFFENDER(e);
icmp_sin = (struct sockaddr_in *) icmp_addr;
if (icmp_addr->sa_family != AF_INET) {
debug("ICMP's address family is %d, not AF_INET?\n", icmp_addr->sa_family);
continue;
}
if (icmp_sin->sin_port != 0) {
debug("ICMP's 'port' is not 0?\n");
continue;
}
debug("msg_flags: %d", msg.msg_flags);
if (o_debug) {
if (msg.msg_flags & MSG_TRUNC) fprintf(stderr, " MSG_TRUNC");
if (msg.msg_flags & MSG_CTRUNC) fprintf(stderr, " MSG_CTRUNC");
if (msg.msg_flags & MSG_EOR) fprintf(stderr, " MSG_EOR");
if (msg.msg_flags & MSG_OOB) fprintf(stderr, " MSG_OOB");
if (msg.msg_flags & MSG_ERRQUEUE) fprintf(stderr, " MSG_ERRQUEUE");
fprintf(stderr, "\n");
}
if (o_debug >= 3)
hexdump(vec_buf, len);
if (e->ee_type == 3 && e->ee_code == 4) {
debug("ICMP type 3, code 4: Fragmentation error, discovered MTU %d\n", e->ee_info);
utp_process_icmp_fragmentation(ctx, vec_buf, len, (struct sockaddr *)&remote, sizeof(remote), e->ee_info);
}
else {
debug("ICMP type %d, code %d\n", e->ee_type, e->ee_code);
utp_process_icmp_error(ctx, vec_buf, len, (struct sockaddr *)&remote, sizeof(remote));
}
}
}
}
#endif
void network_loop(void)
{
unsigned char socket_data[4096];
struct sockaddr_in src_addr;
socklen_t addrlen = sizeof(src_addr);
ssize_t len;
int ret;
struct pollfd p[2];
p[0].fd = STDIN_FILENO;
p[0].events = (o_buf_size-buf_len && !eof_flag) ? POLLIN : 0;
p[1].fd = fd;
p[1].events = POLLIN;
ret = poll(p, 2, 500);
if (ret < 0) {
if (errno == EINTR)
debug("poll() returned EINTR\n");
else
pdie("poll");
}
else if (ret == 0) {
if (o_debug >= 3)
debug("poll() timeout\n");
}
else {
if ((p[0].revents & POLLIN) == POLLIN) {
len = read(STDIN_FILENO, buf+buf_len, o_buf_size-buf_len);
if (len < 0 && errno != EINTR)
pdie("read stdin");
if (len == 0) {
debug("EOF from file\n");
eof_flag = 1;
close(STDIN_FILENO);
}
else {
buf_len += len;
debug("Read %d bytes, buffer now %d bytes long\n", len, buf_len);
}
write_data();
}
#ifdef __linux__
if ((p[1].revents & POLLERR) == POLLERR)
handle_icmp();
#endif
if ((p[1].revents & POLLIN) == POLLIN) {
while (1) {
len = recvfrom(fd, socket_data, sizeof(socket_data), MSG_DONTWAIT, (struct sockaddr *)&src_addr, &addrlen);
if (len < 0) {
if (errno == EAGAIN || errno == EWOULDBLOCK) {
utp_issue_deferred_acks(ctx);
break;
}
else
pdie("recv");
}
debug("Received %zd byte UDP packet from %s:%d\n", len, inet_ntoa(src_addr.sin_addr), ntohs(src_addr.sin_port));
if (o_debug >= 3)
hexdump(socket_data, len);
if (! utp_process_udp(ctx, socket_data, len, (struct sockaddr *)&src_addr, addrlen))
debug("UDP packet not handled by UTP. Ignoring.\n");
}
}
}
utp_check_timeouts(ctx);
}
void usage(char *name)
{
fprintf(stderr, "\nUsage:\n");
fprintf(stderr, " %s [options] <destination-IP> <destination-port>\n", name);
fprintf(stderr, " %s [options] -l -p <listening-port>\n", name);
fprintf(stderr, "\n");
fprintf(stderr, "Options:\n");
fprintf(stderr, " -h Help\n");
fprintf(stderr, " -d Debug mode; use multiple times to increase verbosity.\n");
fprintf(stderr, " -l Listen mode\n");
fprintf(stderr, " -p <port> Local port\n");
fprintf(stderr, " -s <IP> Source IP\n");
fprintf(stderr, " -B <size> Buffer size\n");
fprintf(stderr, " -n Don't resolve hostnames\n");
fprintf(stderr, "\n");
exit(1);
}
int main(int argc, char *argv[])
{
int i;
o_local_address = "0.0.0.0";
while (1) {
int c = getopt (argc, argv, "hdlp:B:s:n");
if (c == -1) break;
switch(c) {
case 'h': usage(argv[0]); break;
case 'd': o_debug++; break;
case 'l': o_listen++; break;
case 'p': o_local_port = optarg; break;
case 'B': o_buf_size = atoi(optarg); break;
case 's': o_local_address = optarg; break;
case 'n': o_numeric++; break;
//case 'w': break; // timeout for connects and final net reads
default:
die("Unhandled argument: %c\n", c);
}
}
for (i = optind; i < argc; i++) {
switch(i - optind) {
case 0: o_remote_address = argv[i]; break;
case 1: o_remote_port = argv[i]; break;
}
}
if (o_listen && (o_remote_port || o_remote_address))
usage(argv[0]);
if (! o_listen && (!o_remote_port || !o_remote_address))
usage(argv[0]);
setup();
while (!quit_flag)
network_loop();
if (buf_len) {
fprintf(stderr, "Warning: send buffer not empty\n");
exit_code++;
}
utp_context_stats *stats = utp_get_context_stats(ctx);
if (stats) {
debug(" Bucket size: <23 <373 <723 <1400 >1400\n");
debug("Number of packets sent: %5d %5d %5d %5d %5d\n",
stats->_nraw_send[0], stats->_nraw_send[1], stats->_nraw_send[2], stats->_nraw_send[3], stats->_nraw_send[4]);
debug("Number of packets recv: %5d %5d %5d %5d %5d\n",
stats->_nraw_recv[0], stats->_nraw_recv[1], stats->_nraw_recv[2], stats->_nraw_recv[3], stats->_nraw_recv[4]);
}
else {
debug("utp_get_context_stats() failed?\n");
}
debug("Destroying context\n");
utp_destroy(ctx);
return exit_code;
}