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litespeed-quic/bin/md5_server.c

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/* Copyright (c) 2017 - 2022 LiteSpeed Technologies Inc. See LICENSE. */
/*
* md5_server.c -- Read one or more streams from the client and return
* MD5 sum of the payload.
*/
#include <assert.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/queue.h>
#include <time.h>
#include <unistd.h>
#include <openssl/md5.h>
#include <event2/event.h>
#include "lsquic.h"
#include "test_common.h"
#include "../src/liblsquic/lsquic_hash.h"
#include "test_cert.h"
#include "prog.h"
#include "../src/liblsquic/lsquic_logger.h"
static int g_really_calculate_md5 = 1;
/* Turn on to test whether stream reset is being sent when stream is closed
* prematurely.
*/
static struct {
unsigned stream_id;
unsigned long limit;
unsigned long n_read;
} g_premature_close;
struct lsquic_conn_ctx;
struct server_ctx {
TAILQ_HEAD(, lsquic_conn_ctx) conn_ctxs;
unsigned max_reqs;
int n_conn;
time_t expiry;
struct sport_head sports;
struct prog *prog;
};
struct lsquic_conn_ctx {
TAILQ_ENTRY(lsquic_conn_ctx) next_connh;
lsquic_conn_t *conn;
unsigned n_reqs, n_closed;
struct server_ctx *server_ctx;
};
static lsquic_conn_ctx_t *
server_on_new_conn (void *stream_if_ctx, lsquic_conn_t *conn)
{
struct server_ctx *server_ctx = stream_if_ctx;
lsquic_conn_ctx_t *conn_h = calloc(1, sizeof(*conn_h));
conn_h->conn = conn;
conn_h->server_ctx = server_ctx;
TAILQ_INSERT_TAIL(&server_ctx->conn_ctxs, conn_h, next_connh);
LSQ_NOTICE("New connection!");
print_conn_info(conn);
return conn_h;
}
static void
server_on_conn_closed (lsquic_conn_t *conn)
{
lsquic_conn_ctx_t *conn_h = lsquic_conn_get_ctx(conn);
int stopped;
if (conn_h->server_ctx->expiry && conn_h->server_ctx->expiry < time(NULL))
{
LSQ_NOTICE("reached engine expiration time, shut down");
prog_stop(conn_h->server_ctx->prog);
stopped = 1;
}
else
stopped = 0;
if (conn_h->server_ctx->n_conn)
{
--conn_h->server_ctx->n_conn;
LSQ_NOTICE("Connection closed, remaining: %d", conn_h->server_ctx->n_conn);
if (0 == conn_h->server_ctx->n_conn && !stopped)
prog_stop(conn_h->server_ctx->prog);
}
else
LSQ_NOTICE("Connection closed");
TAILQ_REMOVE(&conn_h->server_ctx->conn_ctxs, conn_h, next_connh);
lsquic_conn_set_ctx(conn, NULL);
free(conn_h);
}
struct lsquic_stream_ctx {
lsquic_stream_t *stream;
struct server_ctx *server_ctx;
MD5_CTX md5ctx;
unsigned char md5sum[MD5_DIGEST_LENGTH];
char md5str[MD5_DIGEST_LENGTH * 2 + 1];
};
static struct lsquic_conn_ctx *
find_conn_h (const struct server_ctx *server_ctx, lsquic_stream_t *stream)
{
struct lsquic_conn_ctx *conn_h;
lsquic_conn_t *conn;
conn = lsquic_stream_conn(stream);
TAILQ_FOREACH(conn_h, &server_ctx->conn_ctxs, next_connh)
if (conn_h->conn == conn)
return conn_h;
return NULL;
}
static lsquic_stream_ctx_t *
server_md5_on_new_stream (void *stream_if_ctx, lsquic_stream_t *stream)
{
struct lsquic_conn_ctx *conn_h;
lsquic_stream_ctx_t *st_h = malloc(sizeof(*st_h));
st_h->stream = stream;
st_h->server_ctx = stream_if_ctx;
lsquic_stream_wantread(stream, 1);
if (g_really_calculate_md5)
MD5_Init(&st_h->md5ctx);
conn_h = find_conn_h(st_h->server_ctx, stream);
assert(conn_h);
conn_h->n_reqs++;
LSQ_NOTICE("request #%u", conn_h->n_reqs);
if (st_h->server_ctx->max_reqs &&
conn_h->n_reqs >= st_h->server_ctx->max_reqs)
{
/* The assert guards the assumption that after the we mark the
* connection as going away, no new streams are opened and thus
* this callback is not called.
*/
assert(conn_h->n_reqs == st_h->server_ctx->max_reqs);
LSQ_NOTICE("reached maximum requests: %u, going away",
st_h->server_ctx->max_reqs);
lsquic_conn_going_away(conn_h->conn);
}
return st_h;
}
static void
server_md5_on_read (lsquic_stream_t *stream, lsquic_stream_ctx_t *st_h)
{
char buf[0x1000];
ssize_t nr;
nr = lsquic_stream_read(stream, buf, sizeof(buf));
if (-1 == nr)
{
/* This should never return an error if we only call read() once
* per callback.
*/
perror("lsquic_stream_read");
lsquic_stream_shutdown(stream, 0);
return;
}
if (g_premature_close.limit &&
g_premature_close.stream_id == lsquic_stream_id(stream))
{
g_premature_close.n_read += nr;
if (g_premature_close.n_read > g_premature_close.limit)
{
LSQ_WARN("Done after reading %lu bytes", g_premature_close.n_read);
lsquic_stream_shutdown(stream, 0);
return;
}
}
if (nr)
{
if (g_really_calculate_md5)
MD5_Update(&st_h->md5ctx, buf, nr);
}
else
{
lsquic_stream_wantread(stream, 0);
if (g_really_calculate_md5)
{
MD5_Final(st_h->md5sum, &st_h->md5ctx);
snprintf(st_h->md5str, sizeof(st_h->md5str),
"%02x%02x%02x%02x%02x%02x%02x%02x"
"%02x%02x%02x%02x%02x%02x%02x%02x"
, st_h->md5sum[0]
, st_h->md5sum[1]
, st_h->md5sum[2]
, st_h->md5sum[3]
, st_h->md5sum[4]
, st_h->md5sum[5]
, st_h->md5sum[6]
, st_h->md5sum[7]
, st_h->md5sum[8]
, st_h->md5sum[9]
, st_h->md5sum[10]
, st_h->md5sum[11]
, st_h->md5sum[12]
, st_h->md5sum[13]
, st_h->md5sum[14]
, st_h->md5sum[15]
);
}
else
{
memset(st_h->md5str, '0', sizeof(st_h->md5str) - 1);
st_h->md5str[sizeof(st_h->md5str) - 1] = '\0';
}
lsquic_stream_wantwrite(stream, 1);
lsquic_stream_shutdown(stream, 0);
}
}
static void
server_md5_on_write (lsquic_stream_t *stream, lsquic_stream_ctx_t *st_h)
{
ssize_t nw;
nw = lsquic_stream_write(stream, st_h->md5str, sizeof(st_h->md5str) - 1);
if (-1 == nw)
{
perror("lsquic_stream_write");
return;
}
lsquic_stream_wantwrite(stream, 0);
lsquic_stream_shutdown(stream, 1);
}
static void
server_on_close (lsquic_stream_t *stream, lsquic_stream_ctx_t *st_h)
{
struct lsquic_conn_ctx *conn_h;
LSQ_NOTICE("%s called", __func__);
conn_h = find_conn_h(st_h->server_ctx, stream);
conn_h->n_closed++;
if (st_h->server_ctx->max_reqs &&
conn_h->n_closed >= st_h->server_ctx->max_reqs)
{
assert(conn_h->n_closed == st_h->server_ctx->max_reqs);
LSQ_NOTICE("closing connection after completing %u requests",
conn_h->n_closed);
lsquic_conn_close(conn_h->conn);
}
free(st_h);
}
const struct lsquic_stream_if server_md5_stream_if = {
.on_new_conn = server_on_new_conn,
.on_conn_closed = server_on_conn_closed,
.on_new_stream = server_md5_on_new_stream,
.on_read = server_md5_on_read,
.on_write = server_md5_on_write,
.on_close = server_on_close,
};
static void
usage (const char *prog)
{
const char *const slash = strrchr(prog, '/');
if (slash)
prog = slash + 1;
printf(
"Usage: %s [opts]\n"
"\n"
"Options:\n"
" -e EXPIRY Stop engine after this many seconds. The expiration is\n"
" checked when connections are closed.\n"
, prog);
}
int
main (int argc, char **argv)
{
int opt, s;
struct prog prog;
struct server_ctx server_ctx;
memset(&server_ctx, 0, sizeof(server_ctx));
TAILQ_INIT(&server_ctx.conn_ctxs);
server_ctx.prog = &prog;
TAILQ_INIT(&server_ctx.sports);
prog_init(&prog, LSENG_SERVER, &server_ctx.sports,
&server_md5_stream_if, &server_ctx);
while (-1 != (opt = getopt(argc, argv, PROG_OPTS "hr:Fn:e:p:")))
{
switch (opt) {
case 'F':
g_really_calculate_md5 = 0;
break;
case 'p':
g_premature_close.stream_id = atoi(optarg);
g_premature_close.limit = atoi(strchr(optarg, ':') + 1);
break;
case 'r':
server_ctx.max_reqs = atoi(optarg);
break;
case 'e':
server_ctx.expiry = time(NULL) + atoi(optarg);
break;
case 'n':
server_ctx.n_conn = atoi(optarg);
break;
case 'h':
usage(argv[0]);
prog_print_common_options(&prog, stdout);
exit(0);
default:
if (0 != prog_set_opt(&prog, opt, optarg))
exit(1);
}
}
add_alpn("md5");
if (0 != prog_prep(&prog))
{
LSQ_ERROR("could not prep");
exit(EXIT_FAILURE);
}
LSQ_DEBUG("entering event loop");
s = prog_run(&prog);
prog_cleanup(&prog);
exit(0 == s ? EXIT_SUCCESS : EXIT_FAILURE);
}
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