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litespeed-quic/bin/prog.c

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/* Copyright (c) 2017 - 2022 LiteSpeed Technologies Inc. See LICENSE. */
#include <assert.h>
#ifndef WIN32
#include <arpa/inet.h>
#include <netinet/in.h>
#include <signal.h>
#endif
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/queue.h>
#ifndef WIN32
#include <unistd.h>
#else
#include "vc_compat.h"
#include "getopt.h"
#pragma warning(disable:4028)
#endif// WIN32
#include <event2/event.h>
#include <lsquic.h>
#include <openssl/ssl.h>
#include "../src/liblsquic/lsquic_hash.h"
#include "../src/liblsquic/lsquic_int_types.h"
#include "../src/liblsquic/lsquic_util.h"
#include "../src/liblsquic/lsquic_logger.h"
#include "test_config.h"
#include "test_cert.h"
#include "test_common.h"
#include "prog.h"
static int prog_stopped;
static const char *s_keylog_dir;
static const char *s_sess_resume_file;
static SSL_CTX * get_ssl_ctx (void *, const struct sockaddr *);
static void keylog_log_line (const SSL *, const char *);
static const struct lsquic_packout_mem_if pmi = {
.pmi_allocate = pba_allocate,
.pmi_release = pba_release,
.pmi_return = pba_release,
};
int
prog_init (struct prog *prog, unsigned flags,
struct sport_head *sports,
const struct lsquic_stream_if *stream_if, void *stream_if_ctx)
{
#ifdef WIN32
WSADATA wsd;
int s = WSAStartup(MAKEWORD(2, 2), &wsd);
if (s != 0)
{
LSQ_ERROR("WSAStartup failed: %d", s);
return -1;
}
#endif
/* prog-specific initialization: */
memset(prog, 0, sizeof(*prog));
prog->prog_engine_flags = flags;
prog->prog_sports = sports;
lsquic_engine_init_settings(&prog->prog_settings, flags);
#if ECN_SUPPORTED
prog->prog_settings.es_ecn = LSQUIC_DF_ECN;
#else
prog->prog_settings.es_ecn = 0;
#endif
prog->prog_api.ea_settings = &prog->prog_settings;
prog->prog_api.ea_stream_if = stream_if;
prog->prog_api.ea_stream_if_ctx = stream_if_ctx;
prog->prog_api.ea_packets_out = sport_packets_out;
prog->prog_api.ea_packets_out_ctx
= prog;
prog->prog_api.ea_pmi = &pmi;
prog->prog_api.ea_pmi_ctx = &prog->prog_pba;
prog->prog_api.ea_get_ssl_ctx = get_ssl_ctx;
#if LSQUIC_PREFERRED_ADDR
if (getenv("LSQUIC_PREFERRED_ADDR4") || getenv("LSQUIC_PREFERRED_ADDR6"))
prog->prog_flags |= PROG_SEARCH_ADDRS;
#endif
/* Non prog-specific initialization: */
lsquic_global_init(flags & LSENG_SERVER ? LSQUIC_GLOBAL_SERVER :
LSQUIC_GLOBAL_CLIENT);
lsquic_log_to_fstream(stderr, LLTS_HHMMSSMS);
lsquic_logger_lopt("=notice");
return 0;
}
static int
prog_add_sport (struct prog *prog, const char *arg)
{
struct service_port *sport;
sport = sport_new(arg, prog);
if (!sport)
return -1;
/* Default settings: */
sport->sp_flags = prog->prog_dummy_sport.sp_flags;
sport->sp_sndbuf = prog->prog_dummy_sport.sp_sndbuf;
sport->sp_rcvbuf = prog->prog_dummy_sport.sp_rcvbuf;
TAILQ_INSERT_TAIL(prog->prog_sports, sport, next_sport);
return 0;
}
void
prog_print_common_options (const struct prog *prog, FILE *out)
{
fprintf(out,
" -0 FILE Provide session resumption file (reading or writing)\n"
#if HAVE_REGEX
" -s SVCPORT Service port. Takes on the form of host:port, host,\n"
" or port. If host is not an IPv4 or IPv6 address, it is\n"
" resolved. If host is not set, the value of SNI is\n"
" used (see the -H flag). If port is not set, the default\n"
" is 443.\n"
#else
" -s SVCPORT Service port. Takes on the form of host:port or host.\n"
" If host is not an IPv4 or IPv6 address, it is resolved.\n"
" If port is not set, the default is 443.\n"
#endif
" Examples:\n"
" 127.0.0.1:12345\n"
" ::1:443\n"
" example.com\n"
" example.com:8443\n"
#if HAVE_REGEX
" 8443\n"
#endif
" If no -s option is given, 0.0.0.0:12345 address\n"
" is used.\n"
#if LSQUIC_DONTFRAG_SUPPORTED
" -D Do not set `do not fragment' flag on outgoing UDP packets\n"
#endif
" -z BYTES Maximum size of outgoing UDP packets (client only).\n"
" Overrides -o base_plpmtu.\n"
" -L LEVEL Log level for all modules. Possible values are `debug',\n"
" `info', `notice', `warn', `error', `alert', `emerg',\n"
" and `crit'.\n"
" -l LEVELS Log levels for modules, e.g.\n"
" -l event=info,engine=debug\n"
" Can be specified more than once.\n"
" -m MAX Maximum number of outgoing packet buffers that can be\n"
" assigned at any one time. By default, there is no max.\n"
" -y style Timestamp style used in log messages. The following styles\n"
" are supported:\n"
" 0 No timestamp\n"
" 1 Millisecond time (this is the default).\n"
" Example: 11:04:05.196\n"
" 2 Full date and millisecond time.\n"
" Example: 2017-03-21 13:43:46.671\n"
" 3 Chrome-like timestamp: date/time.microseconds.\n"
" Example: 1223/104613.946956\n"
" 4 Microsecond time.\n"
" Example: 11:04:05.196308\n"
" 5 Full date and microsecond time.\n"
" Example: 2017-03-21 13:43:46.671345\n"
" -S opt=val Socket options. Supported options:\n"
" sndbuf=12345 # Sets SO_SNDBUF\n"
" rcvbuf=12345 # Sets SO_RCVBUF\n"
" -W Use stock PMI (malloc & free)\n"
" -A CC_ALGO Congestion control algorithm. The following algorithms are\n"
" supported.\n"
" 1: Cubic\n"
" 2: BBRv1\n"
" 3: Adaptive congestion control (this is the default).\n"
);
#if HAVE_SENDMMSG
fprintf(out,
" -g Use sendmmsg() to send packets.\n"
);
#endif
#if HAVE_RECVMMSG
fprintf(out,
" -j Use recvmmsg() to receive packets.\n"
);
#endif
if (prog->prog_engine_flags & LSENG_SERVER)
fprintf(out,
" -c CERTSPEC Service specification. The specification is three values\n"
" separated by commas. The values are:\n"
" * Domain name\n"
" * File containing cert in PEM format\n"
" * File containing private key in DER or PEM format\n"
" Example:\n"
" -c www.example.com,/tmp/cert.pem,/tmp/key.pkcs8\n"
);
else
{
if (prog->prog_engine_flags & LSENG_HTTP)
fprintf(out,
" -H host Value of `host' HTTP header. This is also used as SNI\n"
" in Client Hello. This option is used to override the\n"
" `host' part of the address specified using -s flag.\n"
);
else
fprintf(out,
" -H host Value of SNI in CHLO.\n"
);
}
#ifndef WIN32
fprintf(out,
" -G dir SSL keys will be logged to files in this directory.\n"
);
#endif
fprintf(out,
" -k Connect UDP socket. Only meant to be used with clients\n"
" to pick up ICMP errors.\n"
" -i USECS Clock granularity in microseconds. Defaults to %u.\n",
LSQUIC_DF_CLOCK_GRANULARITY
);
fprintf(out,
" -h Print this help screen and exit\n"
);
}
int
prog_set_opt (struct prog *prog, int opt, const char *arg)
{
#ifndef WIN32
struct stat st;
int s;
#endif
switch (opt)
{
#if LSQUIC_DONTFRAG_SUPPORTED
case 'D':
{
struct service_port *sport = TAILQ_LAST(prog->prog_sports, sport_head);
if (!sport)
sport = &prog->prog_dummy_sport;
sport->sp_flags |= SPORT_FRAGMENT_OK;
}
return 0;
#endif
#if HAVE_SENDMMSG
case 'g':
prog->prog_use_sendmmsg = 1;
return 0;
#endif
#if HAVE_RECVMMSG
case 'j':
prog->prog_use_recvmmsg = 1;
return 0;
#endif
case 'm':
prog->prog_packout_max = atoi(arg);
return 0;
case 'z':
prog->prog_max_packet_size = atoi(arg);
return 0;
case 'W':
prog->prog_use_stock_pmi = 1;
return 0;
case 'A':
prog->prog_settings.es_cc_algo = atoi(optarg);
return 0;
case 'c':
if (prog->prog_engine_flags & LSENG_SERVER)
{
if (!prog->prog_certs)
prog->prog_certs = lsquic_hash_create();
return load_cert(prog->prog_certs, arg);
}
else
return -1;
case 'H':
if (prog->prog_engine_flags & LSENG_SERVER)
return -1;
prog->prog_hostname = arg;
return 0;
case 'y':
lsquic_log_to_fstream(stderr, atoi(arg));
return 0;
case 'L':
return lsquic_set_log_level(arg);
case 'l':
return lsquic_logger_lopt(arg);
case 'o':
return set_engine_option(&prog->prog_settings,
&prog->prog_version_cleared, arg);
case 'i':
prog->prog_settings.es_clock_granularity = atoi(arg);
return 0;
case 's':
if (0 == (prog->prog_engine_flags & LSENG_SERVER) &&
!TAILQ_EMPTY(prog->prog_sports))
return -1;
return prog_add_sport(prog, arg);
case 'S':
{
struct service_port *sport = TAILQ_LAST(prog->prog_sports, sport_head);
if (!sport)
sport = &prog->prog_dummy_sport;
char *const name = strdup(optarg);
char *val = strchr(name, '=');
if (!val)
{
free(name);
return -1;
}
*val = '\0';
++val;
if (0 == strcasecmp(name, "sndbuf"))
{
sport->sp_flags |= SPORT_SET_SNDBUF;
sport->sp_sndbuf = atoi(val);
free(name);
return 0;
}
else if (0 == strcasecmp(name, "rcvbuf"))
{
sport->sp_flags |= SPORT_SET_RCVBUF;
sport->sp_rcvbuf = atoi(val);
free(name);
return 0;
}
else
{
free(name);
return -1;
}
}
case 'k':
{
struct service_port *sport = TAILQ_LAST(prog->prog_sports, sport_head);
if (!sport)
sport = &prog->prog_dummy_sport;
sport->sp_flags |= SPORT_CONNECT;
}
return 0;
case '0':
s_sess_resume_file = optarg;
return 0;
case 'G':
#ifndef WIN32
if (0 == stat(optarg, &st))
{
if (!S_ISDIR(st.st_mode))
{
LSQ_ERROR("%s is not a directory", optarg);
return -1;
}
}
else
{
s = mkdir(optarg, 0700);
if (s != 0)
{
LSQ_ERROR("cannot create directory %s: %s", optarg,
strerror(errno));
return -1;
}
}
s_keylog_dir = optarg;
if (prog->prog_settings.es_ql_bits)
{
LSQ_NOTICE("QL loss bits turned off because of -G. If you want "
"to turn it on, just override: -G dir -o ql_bits=2");
prog->prog_settings.es_ql_bits = 0;
}
return 0;
#else
LSQ_ERROR("key logging is not supported on Windows");
return -1;
#endif
default:
return 1;
}
}
struct event_base *
prog_eb (struct prog *prog)
{
return prog->prog_eb;
}
int
prog_connect (struct prog *prog, unsigned char *sess_resume, size_t sess_resume_len)
{
struct service_port *sport;
sport = TAILQ_FIRST(prog->prog_sports);
if (NULL == lsquic_engine_connect(prog->prog_engine, N_LSQVER,
(struct sockaddr *) &sport->sp_local_addr,
(struct sockaddr *) &sport->sas, sport, NULL,
prog->prog_hostname ? prog->prog_hostname
/* SNI is required for HTTP */
: prog->prog_engine_flags & LSENG_HTTP ? sport->host
: NULL,
prog->prog_max_packet_size, sess_resume, sess_resume_len,
sport->sp_token_buf, sport->sp_token_sz))
return -1;
prog_process_conns(prog);
return 0;
}
static int
prog_init_client (struct prog *prog)
{
struct service_port *sport;
sport = TAILQ_FIRST(prog->prog_sports);
if (0 != sport_init_client(sport, prog->prog_engine, prog->prog_eb))
return -1;
return 0;
}
static SSL_CTX *
get_ssl_ctx (void *peer_ctx, const struct sockaddr *unused)
{
const struct service_port *const sport = peer_ctx;
return sport->sp_prog->prog_ssl_ctx;
}
static int
prog_new_session_cb (SSL *ssl, SSL_SESSION *session)
{
unsigned char *buf;
size_t bufsz, nw;
FILE *file;
/* Our client is rather limited: only one file and only one ticket
* can be saved. A more flexible client implementation would call
* lsquic_ssl_to_conn() and maybe save more tickets based on its
* own configuration.
*/
if (!s_sess_resume_file)
return 0;
if (0 != lsquic_ssl_sess_to_resume_info(ssl, session, &buf, &bufsz))
{
LSQ_NOTICE("lsquic_ssl_sess_to_resume_info failed");
return 0;
}
file = fopen(s_sess_resume_file, "wb");
if (!file)
{
LSQ_WARN("cannot open %s for writing: %s",
s_sess_resume_file, strerror(errno));
free(buf);
return 0;
}
nw = fwrite(buf, 1, bufsz, file);
if (nw == bufsz)
{
LSQ_INFO("wrote %zd bytes of session resumption information to %s",
nw, s_sess_resume_file);
s_sess_resume_file = NULL; /* Save just one ticket */
}
else
LSQ_WARN("error: fwrite(%s) returns %zd instead of %zd: %s",
s_sess_resume_file, nw, bufsz, strerror(errno));
fclose(file);
free(buf);
return 0;
}
static int
prog_init_ssl_ctx (struct prog *prog)
{
unsigned char ticket_keys[48];
prog->prog_ssl_ctx = SSL_CTX_new(TLS_method());
if (!prog->prog_ssl_ctx)
{
LSQ_ERROR("cannot allocate SSL context");
return -1;
}
SSL_CTX_set_min_proto_version(prog->prog_ssl_ctx, TLS1_3_VERSION);
SSL_CTX_set_max_proto_version(prog->prog_ssl_ctx, TLS1_3_VERSION);
SSL_CTX_set_default_verify_paths(prog->prog_ssl_ctx);
/* This is obviously test code: the key is just an array of NUL bytes */
memset(ticket_keys, 0, sizeof(ticket_keys));
if (1 != SSL_CTX_set_tlsext_ticket_keys(prog->prog_ssl_ctx,
ticket_keys, sizeof(ticket_keys)))
{
LSQ_ERROR("SSL_CTX_set_tlsext_ticket_keys failed");
return -1;
}
if (s_keylog_dir)
SSL_CTX_set_keylog_callback(prog->prog_ssl_ctx, keylog_log_line);
if (s_sess_resume_file)
{
SSL_CTX_set_session_cache_mode(prog->prog_ssl_ctx,
SSL_SESS_CACHE_CLIENT);
SSL_CTX_set_early_data_enabled(prog->prog_ssl_ctx, 1);
SSL_CTX_sess_set_new_cb(prog->prog_ssl_ctx, prog_new_session_cb);
}
return 0;
}
static int
prog_init_server (struct prog *prog)
{
struct service_port *sport;
TAILQ_FOREACH(sport, prog->prog_sports, next_sport)
if (0 != sport_init_server(sport, prog->prog_engine, prog->prog_eb))
return -1;
return 0;
}
void
prog_process_conns (struct prog *prog)
{
int diff;
struct timeval timeout;
lsquic_engine_process_conns(prog->prog_engine);
if (lsquic_engine_earliest_adv_tick(prog->prog_engine, &diff))
{
if (diff < 0
|| (unsigned) diff < prog->prog_settings.es_clock_granularity)
{
timeout.tv_sec = 0;
timeout.tv_usec = prog->prog_settings.es_clock_granularity;
}
else
{
timeout.tv_sec = (unsigned) diff / 1000000;
timeout.tv_usec = (unsigned) diff % 1000000;
}
if (!prog_is_stopped())
event_add(prog->prog_timer, &timeout);
}
}
static void
prog_timer_handler (int fd, short what, void *arg)
{
struct prog *const prog = arg;
if (!prog_is_stopped())
prog_process_conns(prog);
}
static void
prog_usr1_handler (int fd, short what, void *arg)
{
LSQ_NOTICE("Got SIGUSR1, stopping engine");
prog_stop(arg);
}
static void
prog_usr2_handler (int fd, short what, void *arg)
{
struct prog *const prog = arg;
LSQ_NOTICE("Got SIGUSR2, cool down engine");
prog->prog_flags |= PROG_FLAG_COOLDOWN;
lsquic_engine_cooldown(prog->prog_engine);
prog_process_conns(prog);
}
int
prog_run (struct prog *prog)
{
#ifndef WIN32
prog->prog_usr1 = evsignal_new(prog->prog_eb, SIGUSR1,
prog_usr1_handler, prog);
evsignal_add(prog->prog_usr1, NULL);
prog->prog_usr2 = evsignal_new(prog->prog_eb, SIGUSR2,
prog_usr2_handler, prog);
evsignal_add(prog->prog_usr2, NULL);
#endif
event_base_loop(prog->prog_eb, 0);
return 0;
}
void
prog_cleanup (struct prog *prog)
{
lsquic_engine_destroy(prog->prog_engine);
event_base_free(prog->prog_eb);
if (!prog->prog_use_stock_pmi)
pba_cleanup(&prog->prog_pba);
if (prog->prog_ssl_ctx)
SSL_CTX_free(prog->prog_ssl_ctx);
if (prog->prog_certs)
delete_certs(prog->prog_certs);
lsquic_global_cleanup();
}
void
prog_stop (struct prog *prog)
{
struct service_port *sport;
prog_stopped = 1;
while ((sport = TAILQ_FIRST(prog->prog_sports)))
{
TAILQ_REMOVE(prog->prog_sports, sport, next_sport);
sport_destroy(sport);
}
if (prog->prog_timer)
{
event_del(prog->prog_timer);
event_free(prog->prog_timer);
prog->prog_timer = NULL;
}
if (prog->prog_usr1)
{
event_del(prog->prog_usr1);
event_free(prog->prog_usr1);
prog->prog_usr1 = NULL;
}
if (prog->prog_usr2)
{
event_del(prog->prog_usr2);
event_free(prog->prog_usr2);
prog->prog_usr2 = NULL;
}
}
static void *
keylog_open_file (const SSL *ssl)
{
const lsquic_conn_t *conn;
const lsquic_cid_t *cid;
FILE *fh;
int sz;
char id_str[MAX_CID_LEN * 2 + 1];
char path[PATH_MAX];
conn = lsquic_ssl_to_conn(ssl);
cid = lsquic_conn_id(conn);
lsquic_hexstr(cid->idbuf, cid->len, id_str, sizeof(id_str));
sz = snprintf(path, sizeof(path), "%s/%s.keys", s_keylog_dir, id_str);
if ((size_t) sz >= sizeof(path))
{
LSQ_WARN("%s: file too long", __func__);
return NULL;
}
fh = fopen(path, "ab");
if (!fh)
LSQ_WARN("could not open %s for appending: %s", path, strerror(errno));
return fh;
}
static void
keylog_log_line (const SSL *ssl, const char *line)
{
FILE *file;
file = keylog_open_file(ssl);
if (file)
{
fputs(line, file);
fputs("\n", file);
fclose(file);
}
}
static struct ssl_ctx_st *
no_cert (void *cert_lu_ctx, const struct sockaddr *sa_UNUSED, const char *sni)
{
return NULL;
}
int
prog_prep (struct prog *prog)
{
int s;
char err_buf[100];
if (s_keylog_dir && prog->prog_certs)
{
struct lsquic_hash_elem *el;
struct server_cert *cert;
for (el = lsquic_hash_first(prog->prog_certs); el;
el = lsquic_hash_next(prog->prog_certs))
{
cert = lsquic_hashelem_getdata(el);
SSL_CTX_set_keylog_callback(cert->ce_ssl_ctx, keylog_log_line);
}
}
if (0 != lsquic_engine_check_settings(prog->prog_api.ea_settings,
prog->prog_engine_flags, err_buf, sizeof(err_buf)))
{
LSQ_ERROR("Error in settings: %s", err_buf);
return -1;
}
if (!prog->prog_use_stock_pmi)
pba_init(&prog->prog_pba, prog->prog_packout_max);
else
{
prog->prog_api.ea_pmi = NULL;
prog->prog_api.ea_pmi_ctx = NULL;
}
if (TAILQ_EMPTY(prog->prog_sports))
{
if (prog->prog_hostname)
s = prog_add_sport(prog, prog->prog_hostname);
else
s = prog_add_sport(prog, "0.0.0.0:12345");
if (0 != s)
return -1;
}
if (prog->prog_certs)
{
prog->prog_api.ea_lookup_cert = lookup_cert;
prog->prog_api.ea_cert_lu_ctx = prog->prog_certs;
}
else
{
if (prog->prog_engine_flags & LSENG_SERVER)
LSQ_WARN("Not a single service specified. Use -c option.");
prog->prog_api.ea_lookup_cert = no_cert;
}
prog->prog_eb = event_base_new();
prog->prog_engine = lsquic_engine_new(prog->prog_engine_flags,
&prog->prog_api);
if (!prog->prog_engine)
return -1;
prog->prog_timer = event_new(prog->prog_eb, -1, 0,
prog_timer_handler, prog);
if (0 != prog_init_ssl_ctx(prog))
return -1;
if (prog->prog_engine_flags & LSENG_SERVER)
s = prog_init_server(prog);
else
s = prog_init_client(prog);
if (s != 0)
return -1;
return 0;
}
int
prog_is_stopped (void)
{
return prog_stopped != 0;
}
static void
send_unsent (evutil_socket_t fd, short what, void *arg)
{
struct prog *const prog = arg;
assert(prog->prog_send);
event_del(prog->prog_send);
event_free(prog->prog_send);
prog->prog_send = NULL;
LSQ_DEBUG("on_write event fires");
lsquic_engine_send_unsent_packets(prog->prog_engine);
}
void
prog_sport_cant_send (struct prog *prog, int fd)
{
assert(!prog->prog_send);
LSQ_DEBUG("cannot send: register on_write event");
prog->prog_send = event_new(prog->prog_eb, fd, EV_WRITE, send_unsent, prog);
event_add(prog->prog_send, NULL);
}
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