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d2969c7aee
curl/tests/server/mqttd.c
Daniel Stenberg d009bc2e56
tests: introduce preprocessed test cases 
The runtests script now always performs variable replacement on the
entire test source file before the test gets executed, and saves the
updated version in a temporary file (log/test[num]) so that all test
case readers/servers can use that version (if present) and thus enjoy
the powers of test case variable substitution.

This is necessary to allow complete port number freedom.

Test 309 is updated to work with a non-fixed port number thanks to this.
2020-04-18 22:46:04 +02:00

974 lines
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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at https://curl.haxx.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
***************************************************************************/
#include "server_setup.h"
#include <stdlib.h>
#include <string.h>
#include "util.h"
/* Function
*
* Accepts a TCP connection on a custom port (IPv4 or IPv6). Speaks MQTT.
*
* Read commands from FILE (set with --config). The commands control how to
* act and is reset to defaults each client TCP connect.
*
* Config file keywords:
*
* TODO
*/
/* based on sockfilt.c */
#ifdef HAVE_SIGNAL_H
#include <signal.h>
#endif
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#ifdef HAVE_NETINET_IN6_H
#include <netinet/in6.h>
#endif
#ifdef HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif
#define ENABLE_CURLX_PRINTF
/* make the curlx header define all printf() functions to use the curlx_*
versions instead */
#include "curlx.h" /* from the private lib dir */
#include "getpart.h"
#include "inet_pton.h"
#include "util.h"
#include "server_sockaddr.h"
#include "warnless.h"
/* include memdebug.h last */
#include "memdebug.h"
#ifdef USE_WINSOCK
#undef EINTR
#define EINTR 4 /* errno.h value */
#undef EAGAIN
#define EAGAIN 11 /* errno.h value */
#undef ENOMEM
#define ENOMEM 12 /* errno.h value */
#undef EINVAL
#define EINVAL 22 /* errno.h value */
#endif
#define DEFAULT_PORT 1883 /* MQTT default port */
#ifndef DEFAULT_LOGFILE
#define DEFAULT_LOGFILE "log/mqttd.log"
#endif
#ifndef DEFAULT_CONFIG
#define DEFAULT_CONFIG "mqttd.config"
#endif
#define MQTT_MSG_CONNECT 0x10
#define MQTT_MSG_CONNACK 0x20
#define MQTT_MSG_PUBLISH 0x30
#define MQTT_MSG_PUBACK 0x40
#define MQTT_MSG_SUBSCRIBE 0x82
#define MQTT_MSG_SUBACK 0x90
#define MQTT_MSG_DISCONNECT 0xe0
#define MQTT_CONNACK_LEN 4
#define MQTT_SUBACK_LEN 5
#define MQTT_CLIENTID_LEN 12 /* "curl0123abcd" */
#define MQTT_HEADER_LEN 5 /* max 5 bytes */
struct configurable {
unsigned char version; /* initial version byte in the request must match
this */
};
#define REQUEST_DUMP "log/server.input"
#define CONFIG_VERSION 5
static struct configurable config;
const char *serverlogfile = DEFAULT_LOGFILE;
static const char *configfile = DEFAULT_CONFIG;
#ifdef ENABLE_IPV6
static bool use_ipv6 = FALSE;
#endif
static const char *ipv_inuse = "IPv4";
static unsigned short port = DEFAULT_PORT;
static void resetdefaults(void)
{
logmsg("Reset to defaults");
config.version = CONFIG_VERSION;
}
static unsigned char byteval(char *value)
{
unsigned long num = strtoul(value, NULL, 10);
return num & 0xff;
}
static void getconfig(void)
{
FILE *fp = fopen(configfile, FOPEN_READTEXT);
resetdefaults();
if(fp) {
char buffer[512];
logmsg("parse config file");
while(fgets(buffer, sizeof(buffer), fp)) {
char key[32];
char value[32];
if(2 == sscanf(buffer, "%31s %31s", key, value)) {
if(!strcmp(key, "version")) {
config.version = byteval(value);
logmsg("version [%d] set", config.version);
}
}
}
fclose(fp);
}
}
static void loghex(unsigned char *buffer, ssize_t len)
{
char data[12000];
ssize_t i;
unsigned char *ptr = buffer;
char *optr = data;
ssize_t width = 0;
int left = sizeof(data);
for(i = 0; i<len && (left >= 0); i++) {
msnprintf(optr, left, "%02x", ptr[i]);
width += 2;
optr += 2;
left -= 2;
}
if(width)
logmsg("'%s'", data);
}
typedef enum {
FROM_CLIENT,
FROM_SERVER
} mqttdir;
static void logprotocol(mqttdir dir,
const char *prefix, size_t remlen,
FILE *output,
unsigned char *buffer, ssize_t len)
{
char data[12000] = "";
ssize_t i;
unsigned char *ptr = buffer;
char *optr = data;
ssize_t width = 0;
int left = sizeof(data);
for(i = 0; i<len && (left >= 0); i++) {
msnprintf(optr, left, "%02x", ptr[i]);
width += 2;
optr += 2;
left -= 2;
}
fprintf(output, "%s %s %zx %s\n",
dir == FROM_CLIENT? "client": "server",
prefix, remlen,
data);
}
/* return 0 on success */
static int connack(FILE *dump, curl_socket_t fd)
{
unsigned char packet[]={
MQTT_MSG_CONNACK, 0x02,
0x00, 0x00
};
ssize_t rc = swrite(fd, (char *)packet, sizeof(packet));
if(rc == sizeof(packet)) {
logmsg("WROTE %d bytes [CONACK]", rc);
loghex(packet, rc);
logprotocol(FROM_SERVER, "CONACK", 2, dump, packet, sizeof(packet));
return 0;
}
return 1;
}
/* return 0 on success */
static int suback(FILE *dump, curl_socket_t fd, unsigned short packetid)
{
unsigned char packet[]={
MQTT_MSG_SUBACK, 0x03,
0, 0, /* filled in below */
0x00
};
ssize_t rc;
packet[2] = (unsigned char)(packetid >> 8);
packet[3] = (unsigned char)(packetid & 0xff);
rc = swrite(fd, (char *)packet, sizeof(packet));
if(rc == sizeof(packet)) {
logmsg("WROTE %d bytes [SUBACK]", rc);
loghex(packet, rc);
logprotocol(FROM_SERVER, "SUBACK", 3, dump, packet, rc);
return 0;
}
return 1;
}
#ifdef QOS
/* return 0 on success */
static int puback(FILE *dump, curl_socket_t fd, unsigned short packetid)
{
unsigned char packet[]={
MQTT_MSG_PUBACK, 0x00,
0, 0 /* filled in below */
};
ssize_t rc;
packet[2] = (unsigned char)(packetid >> 8);
packet[3] = (unsigned char)(packetid & 0xff);
rc = swrite(fd, (char *)packet, sizeof(packet));
if(rc == sizeof(packet)) {
logmsg("WROTE %d bytes [PUBACK]", rc);
loghex(packet, rc);
logprotocol(FROM_SERVER, dump, packet, rc);
return 0;
}
logmsg("Failed sending [PUBACK]");
return 1;
}
#endif
/* return 0 on success */
static int disconnect(FILE *dump, curl_socket_t fd)
{
unsigned char packet[]={
MQTT_MSG_DISCONNECT, 0x00,
};
ssize_t rc = swrite(fd, (char *)packet, sizeof(packet));
if(rc == sizeof(packet)) {
logmsg("WROTE %d bytes [DISCONNECT]", rc);
loghex(packet, rc);
logprotocol(FROM_SERVER, "DISCONNECT", 0, dump, packet, rc);
return 0;
}
logmsg("Failed sending [DISCONNECT]");
return 1;
}
/*
do
encodedByte = X MOD 128
X = X DIV 128
// if there are more data to encode, set the top bit of this byte
if ( X > 0 )
encodedByte = encodedByte OR 128
endif
'output' encodedByte
while ( X > 0 )
*/
/* return number of bytes used */
static int encode_length(size_t packetlen, char *remlength) /* 4 bytes */
{
int bytes = 0;
unsigned char encode;
do {
encode = packetlen % 0x80;
packetlen /= 0x80;
if(packetlen)
encode |= 0x80;
remlength[bytes++] = encode;
if(bytes > 3) {
logmsg("too large packet!");
return 0;
}
} while(packetlen);
return bytes;
}
static size_t decode_length(unsigned char *buf,
size_t buflen, size_t *lenbytes)
{
size_t len = 0;
size_t mult = 1;
size_t i;
unsigned char encoded = 0x80;
for(i = 0; (i < buflen) && (encoded & 0x80); i++) {
encoded = buf[i];
len += (encoded & 0x7f) * mult;
mult *= 0x80;
}
if(lenbytes)
*lenbytes = i;
return len;
}
/* return 0 on success */
static int publish(FILE *dump,
curl_socket_t fd, unsigned short packetid,
char *topic, char *payload, size_t payloadlen)
{
size_t topiclen = strlen(topic);
unsigned char *packet;
size_t payloadindex;
ssize_t remaininglength = topiclen + 2 + payloadlen;
ssize_t packetlen;
ssize_t rc;
char rembuffer[4];
int encodedlen;
encodedlen = encode_length(remaininglength, rembuffer);
/* one packet type byte (possibly two more for packetid) */
packetlen = remaininglength + encodedlen + 1;
packet = malloc(packetlen);
if(!packet)
return 1;
packet[0] = MQTT_MSG_PUBLISH; /* TODO: set QoS? */
memcpy(&packet[1], rembuffer, encodedlen);
(void)packetid;
/* packet_id if QoS is set */
packet[1 + encodedlen] = (unsigned char)(topiclen >> 8);
packet[2 + encodedlen] = (unsigned char)(topiclen & 0xff);
memcpy(&packet[3 + encodedlen], topic, topiclen);
payloadindex = 3 + topiclen + encodedlen;
memcpy(&packet[payloadindex], payload, payloadlen);
rc = swrite(fd, (char *)packet, packetlen);
if(rc == packetlen) {
logmsg("WROTE %d bytes [PUBLISH]", rc);
loghex(packet, rc);
logprotocol(FROM_SERVER, "PUBLISH", remaininglength, dump, packet, rc);
return 0;
}
return 1;
}
#define MAX_TOPIC_LENGTH 65535
#define MAX_CLIENT_ID_LENGTH 32
static char topic[MAX_TOPIC_LENGTH + 1];
static int fixedheader(curl_socket_t fd,
unsigned char *bytep,
size_t *remaining_lengthp,
size_t *remaining_length_bytesp)
{
/* get the fixed header */
unsigned char buffer[10];
/* get the first two bytes */
ssize_t rc = sread(fd, (char *)buffer, 2);
int i;
if(rc < 2) {
logmsg("READ %d bytes [SHORT!]", rc);
return 1; /* fail */
}
logmsg("READ %d bytes", rc);
loghex(buffer, rc);
*bytep = buffer[0];
/* if the length byte has the top bit set, get the next one too */
i = 1;
while(buffer[i] & 0x80) {
i++;
rc = sread(fd, (char *)&buffer[i], 1);
if(rc != 1) {
logmsg("Remaining Length broken");
return 1;
}
}
*remaining_lengthp = decode_length(&buffer[1], i, remaining_length_bytesp);
logmsg("Remaining Length: %ld [%d bytes]", (long) *remaining_lengthp,
*remaining_length_bytesp);
return 0;
}
static curl_socket_t mqttit(curl_socket_t fd)
{
unsigned char buffer[10*1024];
ssize_t rc;
unsigned char byte;
unsigned short packet_id;
size_t payload_len;
unsigned int topic_len;
size_t remaining_length = 0;
size_t bytes = 0; /* remaining length field size in bytes */
char client_id[MAX_CLIENT_ID_LENGTH];
long testno;
static const char protocol[7] = {
0x00, 0x04, /* protocol length */
'M','Q','T','T', /* protocol name */
0x04 /* protocol level */
};
FILE *dump = fopen(REQUEST_DUMP, "ab");
if(!dump)
goto end;
getconfig();
do {
/* get the fixed header */
rc = fixedheader(fd, &byte, &remaining_length, &bytes);
if(rc)
break;
if(remaining_length) {
rc = sread(fd, (char *)buffer, remaining_length);
if(rc > 0) {
logmsg("READ %d bytes", rc);
loghex(buffer, rc);
}
}
if(byte == MQTT_MSG_CONNECT) {
logprotocol(FROM_CLIENT, "CONNECT", remaining_length,
dump, buffer, rc);
if(memcmp(protocol, buffer, sizeof(protocol))) {
logmsg("Protocol preamble mismatch");
goto end;
}
/* ignore the connect flag byte and two keepalive bytes */
payload_len = (buffer[10] << 8) | buffer[11];
if((ssize_t)payload_len != (rc - 12)) {
logmsg("Payload length mismatch, expected %x got %x",
rc - 12, payload_len);
goto end;
}
else if((payload_len + 1) > MAX_CLIENT_ID_LENGTH) {
logmsg("Too large client id");
goto end;
}
memcpy(client_id, &buffer[14], payload_len);
client_id[payload_len] = 0;
logmsg("MQTT client connect accepted: %s", client_id);
/* The first packet sent from the Server to the Client MUST be a
CONNACK Packet */
if(connack(dump, fd)) {
logmsg("failed sending CONNACK");
goto end;
}
}
else if(byte == MQTT_MSG_SUBSCRIBE) {
char *testnop;
logprotocol(FROM_CLIENT, "SUBSCRIBE", remaining_length,
dump, buffer, rc);
logmsg("Incoming SUBSCRIBE");
if(rc < 6) {
logmsg("Too small SUBSCRIBE");
goto end;
}
/* two bytes packet id */
packet_id = (unsigned short)((buffer[0] << 8) | buffer[1]);
/* two bytes topic length */
topic_len = (buffer[2] << 8) | buffer[3];
if(topic_len != (remaining_length - 5)) {
logmsg("Wrong topic length, got %d expected %d",
topic_len, remaining_length - 5);
goto end;
}
memcpy(topic, &buffer[4], topic_len);
topic[topic_len] = 0;
/* there's a QoS byte (two bits) after the topic */
logmsg("SUBSCRIBE to '%s' [%d]", topic, packet_id);
if(suback(dump, fd, packet_id)) {
logmsg("failed sending SUBACK");
goto end;
}
testnop = strrchr(topic, '/');
if(!testnop)
testnop = topic;
else
testnop++; /* pass the slash */
testno = strtol(testnop, NULL, 10);
if(testno) {
FILE *stream;
int error;
char *data;
size_t datalen;
logmsg("Found test number %ld", testno);
stream = test2fopen(testno);
error = getpart(&data, &datalen, "reply", "data", stream);
if(!error)
publish(dump, fd, packet_id, topic, data, datalen);
}
else {
char *def = (char *)"this is random payload yes yes it is";
publish(dump, fd, packet_id, topic, def, strlen(def));
}
disconnect(dump, fd);
}
else if((byte & 0xf0) == (MQTT_MSG_PUBLISH & 0xf0)) {
size_t topiclen;
logmsg("Incoming PUBLISH");
logprotocol(FROM_CLIENT, "PUBLISH", remaining_length,
dump, buffer, rc);
topiclen = (buffer[1 + bytes] << 8) | buffer[2 + bytes];
logmsg("Got %d bytes topic", topiclen);
/* TODO: verify topiclen */
#ifdef QOS
/* TODO: handle packetid if there is one. Send puback if QoS > 0 */
puback(dump, fd, 0);
#endif
/* expect a disconnect here */
/* get the request */
rc = sread(fd, (char *)&buffer[0], 2);
logmsg("READ %d bytes [DISCONNECT]", rc);
loghex(buffer, rc);
logprotocol(FROM_CLIENT, "DISCONNECT", 0, dump, buffer, rc);
goto end;
}
else {
/* not supported (yet) */
goto end;
}
} while(1);
end:
fclose(dump);
return CURL_SOCKET_BAD;
}
/*
sockfdp is a pointer to an established stream or CURL_SOCKET_BAD
if sockfd is CURL_SOCKET_BAD, listendfd is a listening socket we must
accept()
*/
static bool incoming(curl_socket_t listenfd)
{
fd_set fds_read;
fd_set fds_write;
fd_set fds_err;
int clients = 0; /* connected clients */
if(got_exit_signal) {
logmsg("signalled to die, exiting...");
return FALSE;
}
#ifdef HAVE_GETPPID
/* As a last resort, quit if socks5 process becomes orphan. */
if(getppid() <= 1) {
logmsg("process becomes orphan, exiting");
return FALSE;
}
#endif
do {
ssize_t rc;
int error = 0;
curl_socket_t sockfd = listenfd;
int maxfd = (int)sockfd;
FD_ZERO(&fds_read);
FD_ZERO(&fds_write);
FD_ZERO(&fds_err);
/* there's always a socket to wait for */
FD_SET(sockfd, &fds_read);
do {
/* select() blocking behavior call on blocking descriptors please */
rc = select(maxfd + 1, &fds_read, &fds_write, &fds_err, NULL);
if(got_exit_signal) {
logmsg("signalled to die, exiting...");
return FALSE;
}
} while((rc == -1) && ((error = SOCKERRNO) == EINTR));
if(rc < 0) {
logmsg("select() failed with error: (%d) %s",
error, strerror(error));
return FALSE;
}
if(FD_ISSET(sockfd, &fds_read)) {
curl_socket_t newfd = accept(sockfd, NULL, NULL);
if(CURL_SOCKET_BAD == newfd) {
error = SOCKERRNO;
logmsg("accept(%d, NULL, NULL) failed with error: (%d) %s",
sockfd, error, strerror(error));
}
else {
logmsg("====> Client connect, fd %d. Read config from %s",
newfd, configfile);
set_advisor_read_lock(SERVERLOGS_LOCK);
(void)mqttit(newfd); /* until done */
clear_advisor_read_lock(SERVERLOGS_LOCK);
logmsg("====> Client disconnect");
sclose(newfd);
}
}
} while(clients);
return TRUE;
}
static curl_socket_t sockdaemon(curl_socket_t sock,
unsigned short *listenport)
{
/* passive daemon style */
srvr_sockaddr_union_t listener;
int flag;
int rc;
int totdelay = 0;
int maxretr = 10;
int delay = 20;
int attempt = 0;
int error = 0;
do {
attempt++;
flag = 1;
rc = setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
(void *)&flag, sizeof(flag));
if(rc) {
error = SOCKERRNO;
logmsg("setsockopt(SO_REUSEADDR) failed with error: (%d) %s",
error, strerror(error));
if(maxretr) {
rc = wait_ms(delay);
if(rc) {
/* should not happen */
logmsg("wait_ms() failed with error: %d", rc);
sclose(sock);
return CURL_SOCKET_BAD;
}
if(got_exit_signal) {
logmsg("signalled to die, exiting...");
sclose(sock);
return CURL_SOCKET_BAD;
}
totdelay += delay;
delay *= 2; /* double the sleep for next attempt */
}
}
} while(rc && maxretr--);
if(rc) {
logmsg("setsockopt(SO_REUSEADDR) failed %d times in %d ms. Error: (%d) %s",
attempt, totdelay, error, strerror(error));
logmsg("Continuing anyway...");
}
/* When the specified listener port is zero, it is actually a
request to let the system choose a non-zero available port. */
#ifdef ENABLE_IPV6
if(!use_ipv6) {
#endif
memset(&listener.sa4, 0, sizeof(listener.sa4));
listener.sa4.sin_family = AF_INET;
listener.sa4.sin_addr.s_addr = INADDR_ANY;
listener.sa4.sin_port = htons(*listenport);
rc = bind(sock, &listener.sa, sizeof(listener.sa4));
#ifdef ENABLE_IPV6
}
else {
memset(&listener.sa6, 0, sizeof(listener.sa6));
listener.sa6.sin6_family = AF_INET6;
listener.sa6.sin6_addr = in6addr_any;
listener.sa6.sin6_port = htons(*listenport);
rc = bind(sock, &listener.sa, sizeof(listener.sa6));
}
#endif /* ENABLE_IPV6 */
if(rc) {
error = SOCKERRNO;
logmsg("Error binding socket on port %hu: (%d) %s",
*listenport, error, strerror(error));
sclose(sock);
return CURL_SOCKET_BAD;
}
if(!*listenport) {
/* The system was supposed to choose a port number, figure out which
port we actually got and update the listener port value with it. */
curl_socklen_t la_size;
srvr_sockaddr_union_t localaddr;
#ifdef ENABLE_IPV6
if(!use_ipv6)
#endif
la_size = sizeof(localaddr.sa4);
#ifdef ENABLE_IPV6
else
la_size = sizeof(localaddr.sa6);
#endif
memset(&localaddr.sa, 0, (size_t)la_size);
if(getsockname(sock, &localaddr.sa, &la_size) < 0) {
error = SOCKERRNO;
logmsg("getsockname() failed with error: (%d) %s",
error, strerror(error));
sclose(sock);
return CURL_SOCKET_BAD;
}
switch(localaddr.sa.sa_family) {
case AF_INET:
*listenport = ntohs(localaddr.sa4.sin_port);
break;
#ifdef ENABLE_IPV6
case AF_INET6:
*listenport = ntohs(localaddr.sa6.sin6_port);
break;
#endif
default:
break;
}
if(!*listenport) {
/* Real failure, listener port shall not be zero beyond this point. */
logmsg("Apparently getsockname() succeeded, with listener port zero.");
logmsg("A valid reason for this failure is a binary built without");
logmsg("proper network library linkage. This might not be the only");
logmsg("reason, but double check it before anything else.");
sclose(sock);
return CURL_SOCKET_BAD;
}
}
/* start accepting connections */
rc = listen(sock, 5);
if(0 != rc) {
error = SOCKERRNO;
logmsg("listen(%d, 5) failed with error: (%d) %s",
sock, error, strerror(error));
sclose(sock);
return CURL_SOCKET_BAD;
}
return sock;
}
int main(int argc, char *argv[])
{
curl_socket_t sock = CURL_SOCKET_BAD;
curl_socket_t msgsock = CURL_SOCKET_BAD;
int wrotepidfile = 0;
int wroteportfile = 0;
const char *pidname = ".mqttd.pid";
const char *portname = ".mqttd.port";
bool juggle_again;
int error;
int arg = 1;
while(argc>arg) {
if(!strcmp("--version", argv[arg])) {
printf("mqttd IPv4%s\n",
#ifdef ENABLE_IPV6
"/IPv6"
#else
""
#endif
);
return 0;
}
else if(!strcmp("--pidfile", argv[arg])) {
arg++;
if(argc>arg)
pidname = argv[arg++];
}
else if(!strcmp("--portfile", argv[arg])) {
arg++;
if(argc>arg)
portname = argv[arg++];
}
else if(!strcmp("--config", argv[arg])) {
arg++;
if(argc>arg)
configfile = argv[arg++];
}
else if(!strcmp("--logfile", argv[arg])) {
arg++;
if(argc>arg)
serverlogfile = argv[arg++];
}
else if(!strcmp("--ipv6", argv[arg])) {
#ifdef ENABLE_IPV6
ipv_inuse = "IPv6";
use_ipv6 = TRUE;
#endif
arg++;
}
else if(!strcmp("--ipv4", argv[arg])) {
/* for completeness, we support this option as well */
#ifdef ENABLE_IPV6
ipv_inuse = "IPv4";
use_ipv6 = FALSE;
#endif
arg++;
}
else if(!strcmp("--port", argv[arg])) {
arg++;
if(argc>arg) {
char *endptr;
unsigned long ulnum = strtoul(argv[arg], &endptr, 10);
if((endptr != argv[arg] + strlen(argv[arg])) ||
((ulnum != 0UL) && ((ulnum < 1025UL) || (ulnum > 65535UL)))) {
fprintf(stderr, "mqttd: invalid --port argument (%s)\n",
argv[arg]);
return 0;
}
port = curlx_ultous(ulnum);
arg++;
}
}
else {
puts("Usage: mqttd [option]\n"
" --config [file]\n"
" --version\n"
" --logfile [file]\n"
" --pidfile [file]\n"
" --ipv4\n"
" --ipv6\n"
" --port [port]\n");
return 0;
}
}
#ifdef WIN32
win32_init();
atexit(win32_cleanup);
setmode(fileno(stdin), O_BINARY);
setmode(fileno(stdout), O_BINARY);
setmode(fileno(stderr), O_BINARY);
#endif
install_signal_handlers(FALSE);
#ifdef ENABLE_IPV6
if(!use_ipv6)
#endif
sock = socket(AF_INET, SOCK_STREAM, 0);
#ifdef ENABLE_IPV6
else
sock = socket(AF_INET6, SOCK_STREAM, 0);
#endif
if(CURL_SOCKET_BAD == sock) {
error = SOCKERRNO;
logmsg("Error creating socket: (%d) %s",
error, strerror(error));
goto mqttd_cleanup;
}
{
/* passive daemon style */
sock = sockdaemon(sock, &port);
if(CURL_SOCKET_BAD == sock) {
goto mqttd_cleanup;
}
msgsock = CURL_SOCKET_BAD; /* no stream socket yet */
}
logmsg("Running %s version", ipv_inuse);
logmsg("Listening on port %hu", port);
wrotepidfile = write_pidfile(pidname);
if(!wrotepidfile) {
goto mqttd_cleanup;
}
wroteportfile = write_portfile(portname, (int)port);
if(!wroteportfile) {
goto mqttd_cleanup;
}
do {
juggle_again = incoming(sock);
} while(juggle_again);
mqttd_cleanup:
if((msgsock != sock) && (msgsock != CURL_SOCKET_BAD))
sclose(msgsock);
if(sock != CURL_SOCKET_BAD)
sclose(sock);
if(wrotepidfile)
unlink(pidname);
restore_signal_handlers(FALSE);
if(got_exit_signal) {
logmsg("============> mqttd exits with signal (%d)", exit_signal);
/*
* To properly set the return status of the process we
* must raise the same signal SIGINT or SIGTERM that we
* caught and let the old handler take care of it.
*/
raise(exit_signal);
}
logmsg("============> mqttd quits");
return 0;
}
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