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|
// SPDX-License-Identifier: GPL-2.0
#define _GNU_SOURCE
#include <errno.h>
#include <limits.h>
#include <fcntl.h>
#include <string.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
#include <signal.h>
#include <unistd.h>
#include <sys/poll.h>
#include <sys/sendfile.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <netdb.h>
#include <netinet/in.h>
#include <linux/tcp.h>
extern int optind;
#ifndef IPPROTO_MPTCP
#define IPPROTO_MPTCP 262
#endif
#ifndef TCP_ULP
#define TCP_ULP 31
#endif
static int poll_timeout = 10 * 1000;
static bool listen_mode;
static bool quit;
enum cfg_mode {
CFG_MODE_POLL,
CFG_MODE_MMAP,
CFG_MODE_SENDFILE,
};
static enum cfg_mode cfg_mode = CFG_MODE_POLL;
static const char *cfg_host;
static const char *cfg_port = "12000";
static int cfg_sock_proto = IPPROTO_MPTCP;
static bool tcpulp_audit;
static int pf = AF_INET;
static int cfg_sndbuf;
static int cfg_rcvbuf;
static bool cfg_join;
static bool cfg_remove;
static unsigned int cfg_do_w;
static int cfg_wait;
static uint32_t cfg_mark;
static void die_usage(void)
{
fprintf(stderr, "Usage: mptcp_connect [-6] [-u] [-s MPTCP|TCP] [-p port] [-m mode]"
"[-l] [-w sec] connect_address\n");
fprintf(stderr, "\t-6 use ipv6\n");
fprintf(stderr, "\t-t num -- set poll timeout to num\n");
fprintf(stderr, "\t-S num -- set SO_SNDBUF to num\n");
fprintf(stderr, "\t-R num -- set SO_RCVBUF to num\n");
fprintf(stderr, "\t-p num -- use port num\n");
fprintf(stderr, "\t-s [MPTCP|TCP] -- use mptcp(default) or tcp sockets\n");
fprintf(stderr, "\t-m [poll|mmap|sendfile] -- use poll(default)/mmap+write/sendfile\n");
fprintf(stderr, "\t-M mark -- set socket packet mark\n");
fprintf(stderr, "\t-u -- check mptcp ulp\n");
fprintf(stderr, "\t-w num -- wait num sec before closing the socket\n");
exit(1);
}
static void handle_signal(int nr)
{
quit = true;
}
static const char *getxinfo_strerr(int err)
{
if (err == EAI_SYSTEM)
return strerror(errno);
return gai_strerror(err);
}
static void xgetnameinfo(const struct sockaddr *addr, socklen_t addrlen,
char *host, socklen_t hostlen,
char *serv, socklen_t servlen)
{
int flags = NI_NUMERICHOST | NI_NUMERICSERV;
int err = getnameinfo(addr, addrlen, host, hostlen, serv, servlen,
flags);
if (err) {
const char *errstr = getxinfo_strerr(err);
fprintf(stderr, "Fatal: getnameinfo: %s\n", errstr);
exit(1);
}
}
static void xgetaddrinfo(const char *node, const char *service,
const struct addrinfo *hints,
struct addrinfo **res)
{
int err = getaddrinfo(node, service, hints, res);
if (err) {
const char *errstr = getxinfo_strerr(err);
fprintf(stderr, "Fatal: getaddrinfo(%s:%s): %s\n",
node ? node : "", service ? service : "", errstr);
exit(1);
}
}
static void set_rcvbuf(int fd, unsigned int size)
{
int err;
err = setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &size, sizeof(size));
if (err) {
perror("set SO_RCVBUF");
exit(1);
}
}
static void set_sndbuf(int fd, unsigned int size)
{
int err;
err = setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &size, sizeof(size));
if (err) {
perror("set SO_SNDBUF");
exit(1);
}
}
static void set_mark(int fd, uint32_t mark)
{
int err;
err = setsockopt(fd, SOL_SOCKET, SO_MARK, &mark, sizeof(mark));
if (err) {
perror("set SO_MARK");
exit(1);
}
}
static int sock_listen_mptcp(const char * const listenaddr,
const char * const port)
{
int sock;
struct addrinfo hints = {
.ai_protocol = IPPROTO_TCP,
.ai_socktype = SOCK_STREAM,
.ai_flags = AI_PASSIVE | AI_NUMERICHOST
};
hints.ai_family = pf;
struct addrinfo *a, *addr;
int one = 1;
xgetaddrinfo(listenaddr, port, &hints, &addr);
hints.ai_family = pf;
for (a = addr; a; a = a->ai_next) {
sock = socket(a->ai_family, a->ai_socktype, cfg_sock_proto);
if (sock < 0)
continue;
if (-1 == setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &one,
sizeof(one)))
perror("setsockopt");
if (bind(sock, a->ai_addr, a->ai_addrlen) == 0)
break; /* success */
perror("bind");
close(sock);
sock = -1;
}
freeaddrinfo(addr);
if (sock < 0) {
fprintf(stderr, "Could not create listen socket\n");
return sock;
}
if (listen(sock, 20)) {
perror("listen");
close(sock);
return -1;
}
return sock;
}
static bool sock_test_tcpulp(const char * const remoteaddr,
const char * const port)
{
struct addrinfo hints = {
.ai_protocol = IPPROTO_TCP,
.ai_socktype = SOCK_STREAM,
};
struct addrinfo *a, *addr;
int sock = -1, ret = 0;
bool test_pass = false;
hints.ai_family = AF_INET;
xgetaddrinfo(remoteaddr, port, &hints, &addr);
for (a = addr; a; a = a->ai_next) {
sock = socket(a->ai_family, a->ai_socktype, IPPROTO_TCP);
if (sock < 0) {
perror("socket");
continue;
}
ret = setsockopt(sock, IPPROTO_TCP, TCP_ULP, "mptcp",
sizeof("mptcp"));
if (ret == -1 && errno == EOPNOTSUPP)
test_pass = true;
close(sock);
if (test_pass)
break;
if (!ret)
fprintf(stderr,
"setsockopt(TCP_ULP) returned 0\n");
else
perror("setsockopt(TCP_ULP)");
}
return test_pass;
}
static int sock_connect_mptcp(const char * const remoteaddr,
const char * const port, int proto)
{
struct addrinfo hints = {
.ai_protocol = IPPROTO_TCP,
.ai_socktype = SOCK_STREAM,
};
struct addrinfo *a, *addr;
int sock = -1;
hints.ai_family = pf;
xgetaddrinfo(remoteaddr, port, &hints, &addr);
for (a = addr; a; a = a->ai_next) {
sock = socket(a->ai_family, a->ai_socktype, proto);
if (sock < 0) {
perror("socket");
continue;
}
if (cfg_mark)
set_mark(sock, cfg_mark);
if (connect(sock, a->ai_addr, a->ai_addrlen) == 0)
break; /* success */
perror("connect()");
close(sock);
sock = -1;
}
freeaddrinfo(addr);
return sock;
}
static size_t do_rnd_write(const int fd, char *buf, const size_t len)
{
static bool first = true;
unsigned int do_w;
ssize_t bw;
do_w = rand() & 0xffff;
if (do_w == 0 || do_w > len)
do_w = len;
if (cfg_join && first && do_w > 100)
do_w = 100;
if (cfg_remove && do_w > cfg_do_w)
do_w = cfg_do_w;
bw = write(fd, buf, do_w);
if (bw < 0)
perror("write");
/* let the join handshake complete, before going on */
if (cfg_join && first) {
usleep(200000);
first = false;
}
if (cfg_remove)
usleep(200000);
return bw;
}
static size_t do_write(const int fd, char *buf, const size_t len)
{
size_t offset = 0;
while (offset < len) {
size_t written;
ssize_t bw;
bw = write(fd, buf + offset, len - offset);
if (bw < 0) {
perror("write");
return 0;
}
written = (size_t)bw;
offset += written;
}
return offset;
}
static ssize_t do_rnd_read(const int fd, char *buf, const size_t len)
{
size_t cap = rand();
cap &= 0xffff;
if (cap == 0)
cap = 1;
else if (cap > len)
cap = len;
return read(fd, buf, cap);
}
static void set_nonblock(int fd)
{
int flags = fcntl(fd, F_GETFL);
if (flags == -1)
return;
fcntl(fd, F_SETFL, flags | O_NONBLOCK);
}
static int copyfd_io_poll(int infd, int peerfd, int outfd)
{
struct pollfd fds = {
.fd = peerfd,
.events = POLLIN | POLLOUT,
};
unsigned int woff = 0, wlen = 0;
char wbuf[8192];
set_nonblock(peerfd);
for (;;) {
char rbuf[8192];
ssize_t len;
if (fds.events == 0)
break;
switch (poll(&fds, 1, poll_timeout)) {
case -1:
if (errno == EINTR)
continue;
perror("poll");
return 1;
case 0:
fprintf(stderr, "%s: poll timed out (events: "
"POLLIN %u, POLLOUT %u)\n", __func__,
fds.events & POLLIN, fds.events & POLLOUT);
return 2;
}
if (fds.revents & POLLIN) {
len = do_rnd_read(peerfd, rbuf, sizeof(rbuf));
if (len == 0) {
/* no more data to receive:
* peer has closed its write side
*/
fds.events &= ~POLLIN;
if ((fds.events & POLLOUT) == 0)
/* and nothing more to send */
break;
/* Else, still have data to transmit */
} else if (len < 0) {
perror("read");
return 3;
}
do_write(outfd, rbuf, len);
}
if (fds.revents & POLLOUT) {
if (wlen == 0) {
woff = 0;
wlen = read(infd, wbuf, sizeof(wbuf));
}
if (wlen > 0) {
ssize_t bw;
bw = do_rnd_write(peerfd, wbuf + woff, wlen);
if (bw < 0)
return 111;
woff += bw;
wlen -= bw;
} else if (wlen == 0) {
/* We have no more data to send. */
fds.events &= ~POLLOUT;
if ((fds.events & POLLIN) == 0)
/* ... and peer also closed already */
break;
/* ... but we still receive.
* Close our write side, ev. give some time
* for address notification and/or checking
* the current status
*/
if (cfg_wait)
usleep(cfg_wait);
shutdown(peerfd, SHUT_WR);
} else {
if (errno == EINTR)
continue;
perror("read");
return 4;
}
}
if (fds.revents & (POLLERR | POLLNVAL)) {
fprintf(stderr, "Unexpected revents: "
"POLLERR/POLLNVAL(%x)\n", fds.revents);
return 5;
}
}
/* leave some time for late join/announce */
if (cfg_join || cfg_remove)
usleep(cfg_wait);
close(peerfd);
return 0;
}
static int do_recvfile(int infd, int outfd)
{
ssize_t r;
do {
char buf[16384];
r = do_rnd_read(infd, buf, sizeof(buf));
if (r > 0) {
if (write(outfd, buf, r) != r)
break;
} else if (r < 0) {
perror("read");
}
} while (r > 0);
return (int)r;
}
static int do_mmap(int infd, int outfd, unsigned int size)
{
char *inbuf = mmap(NULL, size, PROT_READ, MAP_SHARED, infd, 0);
ssize_t ret = 0, off = 0;
size_t rem;
if (inbuf == MAP_FAILED) {
perror("mmap");
return 1;
}
rem = size;
while (rem > 0) {
ret = write(outfd, inbuf + off, rem);
if (ret < 0) {
perror("write");
break;
}
off += ret;
rem -= ret;
}
munmap(inbuf, size);
return rem;
}
static int get_infd_size(int fd)
{
struct stat sb;
ssize_t count;
int err;
err = fstat(fd, &sb);
if (err < 0) {
perror("fstat");
return -1;
}
if ((sb.st_mode & S_IFMT) != S_IFREG) {
fprintf(stderr, "%s: stdin is not a regular file\n", __func__);
return -2;
}
count = sb.st_size;
if (count > INT_MAX) {
fprintf(stderr, "File too large: %zu\n", count);
return -3;
}
return (int)count;
}
static int do_sendfile(int infd, int outfd, unsigned int count)
{
while (count > 0) {
ssize_t r;
r = sendfile(outfd, infd, NULL, count);
if (r < 0) {
perror("sendfile");
return 3;
}
count -= r;
}
return 0;
}
static int copyfd_io_mmap(int infd, int peerfd, int outfd,
unsigned int size)
{
int err;
if (listen_mode) {
err = do_recvfile(peerfd, outfd);
if (err)
return err;
err = do_mmap(infd, peerfd, size);
} else {
err = do_mmap(infd, peerfd, size);
if (err)
return err;
shutdown(peerfd, SHUT_WR);
err = do_recvfile(peerfd, outfd);
}
return err;
}
static int copyfd_io_sendfile(int infd, int peerfd, int outfd,
unsigned int size)
{
int err;
if (listen_mode) {
err = do_recvfile(peerfd, outfd);
if (err)
return err;
err = do_sendfile(infd, peerfd, size);
} else {
err = do_sendfile(infd, peerfd, size);
if (err)
return err;
err = do_recvfile(peerfd, outfd);
}
return err;
}
static int copyfd_io(int infd, int peerfd, int outfd)
{
int file_size;
switch (cfg_mode) {
case CFG_MODE_POLL:
return copyfd_io_poll(infd, peerfd, outfd);
case CFG_MODE_MMAP:
file_size = get_infd_size(infd);
if (file_size < 0)
return file_size;
return copyfd_io_mmap(infd, peerfd, outfd, file_size);
case CFG_MODE_SENDFILE:
file_size = get_infd_size(infd);
if (file_size < 0)
return file_size;
return copyfd_io_sendfile(infd, peerfd, outfd, file_size);
}
fprintf(stderr, "Invalid mode %d\n", cfg_mode);
die_usage();
return 1;
}
static void check_sockaddr(int pf, struct sockaddr_storage *ss,
socklen_t salen)
{
struct sockaddr_in6 *sin6;
struct sockaddr_in *sin;
socklen_t wanted_size = 0;
switch (pf) {
case AF_INET:
wanted_size = sizeof(*sin);
sin = (void *)ss;
if (!sin->sin_port)
fprintf(stderr, "accept: something wrong: ip connection from port 0");
break;
case AF_INET6:
wanted_size = sizeof(*sin6);
sin6 = (void *)ss;
if (!sin6->sin6_port)
fprintf(stderr, "accept: something wrong: ipv6 connection from port 0");
break;
default:
fprintf(stderr, "accept: Unknown pf %d, salen %u\n", pf, salen);
return;
}
if (salen != wanted_size)
fprintf(stderr, "accept: size mismatch, got %d expected %d\n",
(int)salen, wanted_size);
if (ss->ss_family != pf)
fprintf(stderr, "accept: pf mismatch, expect %d, ss_family is %d\n",
(int)ss->ss_family, pf);
}
static void check_getpeername(int fd, struct sockaddr_storage *ss, socklen_t salen)
{
struct sockaddr_storage peerss;
socklen_t peersalen = sizeof(peerss);
if (getpeername(fd, (struct sockaddr *)&peerss, &peersalen) < 0) {
perror("getpeername");
return;
}
if (peersalen != salen) {
fprintf(stderr, "%s: %d vs %d\n", __func__, peersalen, salen);
return;
}
if (memcmp(ss, &peerss, peersalen)) {
char a[INET6_ADDRSTRLEN];
char b[INET6_ADDRSTRLEN];
char c[INET6_ADDRSTRLEN];
char d[INET6_ADDRSTRLEN];
xgetnameinfo((struct sockaddr *)ss, salen,
a, sizeof(a), b, sizeof(b));
xgetnameinfo((struct sockaddr *)&peerss, peersalen,
c, sizeof(c), d, sizeof(d));
fprintf(stderr, "%s: memcmp failure: accept %s vs peername %s, %s vs %s salen %d vs %d\n",
__func__, a, c, b, d, peersalen, salen);
}
}
static void check_getpeername_connect(int fd)
{
struct sockaddr_storage ss;
socklen_t salen = sizeof(ss);
char a[INET6_ADDRSTRLEN];
char b[INET6_ADDRSTRLEN];
if (getpeername(fd, (struct sockaddr *)&ss, &salen) < 0) {
perror("getpeername");
return;
}
xgetnameinfo((struct sockaddr *)&ss, salen,
a, sizeof(a), b, sizeof(b));
if (strcmp(cfg_host, a) || strcmp(cfg_port, b))
fprintf(stderr, "%s: %s vs %s, %s vs %s\n", __func__,
cfg_host, a, cfg_port, b);
}
static void maybe_close(int fd)
{
unsigned int r = rand();
if (!(cfg_join || cfg_remove) && (r & 1))
close(fd);
}
int main_loop_s(int listensock)
{
struct sockaddr_storage ss;
struct pollfd polls;
socklen_t salen;
int remotesock;
polls.fd = listensock;
polls.events = POLLIN;
switch (poll(&polls, 1, poll_timeout)) {
case -1:
perror("poll");
return 1;
case 0:
fprintf(stderr, "%s: timed out\n", __func__);
close(listensock);
return 2;
}
salen = sizeof(ss);
remotesock = accept(listensock, (struct sockaddr *)&ss, &salen);
if (remotesock >= 0) {
maybe_close(listensock);
check_sockaddr(pf, &ss, salen);
check_getpeername(remotesock, &ss, salen);
return copyfd_io(0, remotesock, 1);
}
perror("accept");
return 1;
}
static void init_rng(void)
{
int fd = open("/dev/urandom", O_RDONLY);
unsigned int foo;
if (fd > 0) {
int ret = read(fd, &foo, sizeof(foo));
if (ret < 0)
srand(fd + foo);
close(fd);
}
srand(foo);
}
int main_loop(void)
{
int fd;
/* listener is ready. */
fd = sock_connect_mptcp(cfg_host, cfg_port, cfg_sock_proto);
if (fd < 0)
return 2;
check_getpeername_connect(fd);
if (cfg_rcvbuf)
set_rcvbuf(fd, cfg_rcvbuf);
if (cfg_sndbuf)
set_sndbuf(fd, cfg_sndbuf);
return copyfd_io(0, fd, 1);
}
int parse_proto(const char *proto)
{
if (!strcasecmp(proto, "MPTCP"))
return IPPROTO_MPTCP;
if (!strcasecmp(proto, "TCP"))
return IPPROTO_TCP;
fprintf(stderr, "Unknown protocol: %s\n.", proto);
die_usage();
/* silence compiler warning */
return 0;
}
int parse_mode(const char *mode)
{
if (!strcasecmp(mode, "poll"))
return CFG_MODE_POLL;
if (!strcasecmp(mode, "mmap"))
return CFG_MODE_MMAP;
if (!strcasecmp(mode, "sendfile"))
return CFG_MODE_SENDFILE;
fprintf(stderr, "Unknown test mode: %s\n", mode);
fprintf(stderr, "Supported modes are:\n");
fprintf(stderr, "\t\t\"poll\" - interleaved read/write using poll()\n");
fprintf(stderr, "\t\t\"mmap\" - send entire input file (mmap+write), then read response (-l will read input first)\n");
fprintf(stderr, "\t\t\"sendfile\" - send entire input file (sendfile), then read response (-l will read input first)\n");
die_usage();
/* silence compiler warning */
return 0;
}
static int parse_int(const char *size)
{
unsigned long s;
errno = 0;
s = strtoul(size, NULL, 0);
if (errno) {
fprintf(stderr, "Invalid sndbuf size %s (%s)\n",
size, strerror(errno));
die_usage();
}
if (s > INT_MAX) {
fprintf(stderr, "Invalid sndbuf size %s (%s)\n",
size, strerror(ERANGE));
die_usage();
}
return (int)s;
}
static void parse_opts(int argc, char **argv)
{
int c;
while ((c = getopt(argc, argv, "6jr:lp:s:hut:m:S:R:w:M:")) != -1) {
switch (c) {
case 'j':
cfg_join = true;
cfg_mode = CFG_MODE_POLL;
cfg_wait = 400000;
break;
case 'r':
cfg_remove = true;
cfg_mode = CFG_MODE_POLL;
cfg_wait = 400000;
cfg_do_w = atoi(optarg);
if (cfg_do_w <= 0)
cfg_do_w = 50;
break;
case 'l':
listen_mode = true;
break;
case 'p':
cfg_port = optarg;
break;
case 's':
cfg_sock_proto = parse_proto(optarg);
break;
case 'h':
die_usage();
break;
case 'u':
tcpulp_audit = true;
break;
case '6':
pf = AF_INET6;
break;
case 't':
poll_timeout = atoi(optarg) * 1000;
if (poll_timeout <= 0)
poll_timeout = -1;
break;
case 'm':
cfg_mode = parse_mode(optarg);
break;
case 'S':
cfg_sndbuf = parse_int(optarg);
break;
case 'R':
cfg_rcvbuf = parse_int(optarg);
break;
case 'w':
cfg_wait = atoi(optarg)*1000000;
break;
case 'M':
cfg_mark = strtol(optarg, NULL, 0);
break;
}
}
if (optind + 1 != argc)
die_usage();
cfg_host = argv[optind];
if (strchr(cfg_host, ':'))
pf = AF_INET6;
}
int main(int argc, char *argv[])
{
init_rng();
signal(SIGUSR1, handle_signal);
parse_opts(argc, argv);
if (tcpulp_audit)
return sock_test_tcpulp(cfg_host, cfg_port) ? 0 : 1;
if (listen_mode) {
int fd = sock_listen_mptcp(cfg_host, cfg_port);
if (fd < 0)
return 1;
if (cfg_rcvbuf)
set_rcvbuf(fd, cfg_rcvbuf);
if (cfg_sndbuf)
set_sndbuf(fd, cfg_sndbuf);
if (cfg_mark)
set_mark(fd, cfg_mark);
return main_loop_s(fd);
}
return main_loop();
}
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