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aprsis.c
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/* **************************************************************** *
* *
* APRX -- 2nd generation receive-only APRS-i-gate with *
* minimal requirement of esoteric facilities or *
* libraries of any kind beyond UNIX system libc. *
* *
* (c) Matti Aarnio - OH2MQK, 2007-2014 *
* *
* **************************************************************** */
/* This code works only with single aprsis-server instance! */
#include "aprx.h"
#ifndef DISABLE_IGATE
#include <sys/socket.h>
#include <netdb.h>
#include <netinet/in.h>
#include <signal.h>
#include <arpa/inet.h>
#ifdef HAVE_NETINET_SCTP_H
#include <netinet/sctp.h>
#endif
#if defined(HAVE_PTHREAD_CREATE) && defined(ENABLE_PTHREAD)
#include <pthread.h>
pthread_t aprsis_thread;
pthread_attr_t pthr_attrs;
#endif
/*
* $aprsserver = "rotate.aprs.net:14580";
*
* re-resolve the $aprsserver at each connection setup!
*
* The APRS-IS system connection runs as separate sub-process, once it starts.
* This way the main-loop is independent from uncertainties of DNS resolving
* delay times in this part of the code.
*
*/
enum aprsis_mode {
MODE_TCP,
MODE_SSL,
MODE_SCTP,
MODE_DTLS
};
static char default_passcode[] = "-1";
struct aprsis_host {
char *server_name;
char *server_port;
char *login;
char *pass;
char *filterparam;
int heartbeat_monitor_timeout;
enum aprsis_mode mode;
};
struct aprsis {
int server_socket;
struct aprsis_host *H;
time_t next_reconnect;
time_t last_read;
int wrbuf_len;
int wrbuf_cur;
int rdbuf_len;
int rdbuf_cur;
int rdlin_len;
char wrbuf[16000];
char rdbuf[3000];
char rdline[500];
};
char * const aprsis_loginid;
static struct aprsis *AprsIS;
static struct aprsis_host **AISh;
static int AIShcount;
static int AIShindex;
static int aprsis_up = -1; /* up & down talking socket(pair),
The aprsis talker (thread/child)
uses this socket. */
static int aprsis_down = -1; /* down talking socket(pair),
The aprx main loop uses this socket */
//static dupecheck_t *aprsis_rx_dupecheck;
//int aprsis_dupecheck_storetime = 30;
extern int log_aprsis;
extern int die_now;
void aprsis_init(void)
{
aprsis_up = -1;
aprsis_down = -1;
}
//void enable_aprsis_rx_dupecheck(void) {
// aprsis_rx_dupecheck = dupecheck_new(aprsis_dupecheck_storetime);
//}
#if !(defined(HAVE_PTHREAD_CREATE) && defined(ENABLE_PTHREAD))
static void sig_handler(int sig)
{
die_now = 1;
signal(sig, sig_handler);
}
#endif
/*
*Close APRS-IS server_socket, clean state..
*/
// APRS-IS communicator
static void aprsis_close(struct aprsis *A, const char *why)
{
if (A->server_socket >= 0)
close(A->server_socket); /* close, and flush write buffers */
A->server_socket = -1;
A->wrbuf_len = A->wrbuf_cur = 0;
A->next_reconnect = tick.tv_sec + 10;
A->last_read = tick.tv_sec;
if (!A->H)
return; /* Not connected, nor defined.. */
aprxlog("CLOSE APRSIS %s:%s %s",
A->H->server_name, A->H->server_port,
why ? why : "");
}
/*
* aprsis_queue_() - internal routine - queue data to specific APRS-IS instance
*/
// APRS-IS communicator
static int aprsis_queue_(struct aprsis *A, const char * const addr, const char qtype,
const char *gwcall, const char * const text, int textlen)
{
int i;
char addrbuf[1000];
int addrlen, len;
char * p;
/* Queue for sending to APRS-IS only when the socket is operational */
if (A->server_socket < 0)
return 1;
/* Here the A->H->login is always set. */
/*
* Append stuff on the writebuf, if it fits.
* If it does not fit, something is broken already
* and we just drop it..
*
* Just to make sure that the write pointer is not left
* rewound when all has been done...
*/
if (A->wrbuf_cur >= A->wrbuf_len && A->wrbuf_len > 0)
A->wrbuf_cur = A->wrbuf_len = 0;
addrlen = 0;
if (addr)
addrlen = sprintf(addrbuf, "%s,qA%c,%s:", addr, qtype,
(gwcall
&& *gwcall) ? gwcall : A->H->login);
aprsis_login = A->H->login;
len = addrlen + textlen;
/* Does it fit in ? */
if ((sizeof(A->wrbuf) - 10) <= (A->wrbuf_len + len)) {
/* The string does not fit in, perhaps it needs compacting ? */
if (A->wrbuf_cur > 0) { /* Compacting is possible ! */
memcpy(A->wrbuf, A->wrbuf + A->wrbuf_cur,
A->wrbuf_len - A->wrbuf_cur);
A->wrbuf_len -= A->wrbuf_cur;
A->wrbuf_cur = 0;
}
/* Check again if it fits in.. */
if ((sizeof(A->wrbuf) - 10) <= (A->wrbuf_len + len)) {
/* NOT! Too bad, drop it.. */
return 2;
}
}
/* Place it on our send buffer */
if (addrlen > 0) {
memcpy(A->wrbuf + A->wrbuf_len, addrbuf, addrlen);
A->wrbuf_len += addrlen;
}
/* If there is CR or LF within the packet, terminate packet at it.. */
p = memchr(text, '\r', textlen);
if (p != NULL) {
textlen = p - text;
}
p = memchr(text, '\n', textlen);
if (p != NULL) {
textlen = p - text;
}
/* Append CR+LF at the end of the packet */
p = (char*)(text + textlen);
*p++ = '\r';
*p++ = '\n';
textlen += 2;
memcpy(A->wrbuf + A->wrbuf_len, text, textlen);
A->wrbuf_len += textlen; /* Always supplied with tail newline.. */
/* -- debug --
fwrite(A->wrbuf,A->wrbuf_len,1,stdout);
return 0;
*/
/* Try writing it right away: */
i = write(A->server_socket, A->wrbuf + A->wrbuf_cur,
A->wrbuf_len - A->wrbuf_cur);
if (i > 0) {
// the buffer's last character is \n, don't write it
if (log_aprsis)
aprxlog(A->wrbuf + A->wrbuf_cur, (A->wrbuf_len - A->wrbuf_cur) -1,
"<< %s:%s << ", A->H->server_name, A->H->server_port);
A->wrbuf_cur += i;
if (A->wrbuf_cur >= A->wrbuf_len) { /* Wrote all ! */
A->wrbuf_cur = A->wrbuf_len = 0;
}
}
return 0;
}
/*
* THIS CONNECT ROUTINE WILL BLOCK (At DNS resolving)
*
* This is why APRSIS communication is run at either
* a fork()ed child, or separate pthread from main loop.
*/
// APRS-IS communicator
static void aprsis_reconnect(struct aprsis *A)
{
struct addrinfo req, *ai, *a;
int i;
char *s;
char aprsislogincmd[3000];
const char *errstr;
int errcode;
memset(aprsislogincmd, 0, sizeof(aprsislogincmd)); // please valgrind
aprsis_close(A, "reconnect");
if (A->H == NULL) {
A->H = AISh[AIShindex=0];
} else {
++AIShindex;
if (AIShindex >= AIShcount)
AIShindex = 0;
A->H = AISh[AIShindex];
}
if (!A->H->login) {
if (log_aprsis)
aprxlog("FAIL - APRSIS-LOGIN not defined, no APRSIS connection!");
return; /* Will try to reconnect in about 60 seconds.. */
}
aprsis_login = A->H->login;
memset(&req, 0, sizeof(req));
req.ai_socktype = SOCK_STREAM;
req.ai_protocol = IPPROTO_TCP;
req.ai_flags = 0;
req.ai_family = AF_UNSPEC;
ai = NULL;
i = getaddrinfo(A->H->server_name, A->H->server_port, &req, &ai);
errstr = "address resolution failure";
errcode = errno;
if (i != 0) {
fail_out:;
/* Discard stuff and redo latter.. */
if (ai)
freeaddrinfo(ai);
aprsis_close(A, "fail on connect");
aprxlog("FAIL - Connect to %s:%s failed: %s - errno=%d - %s",
A->H->server_name, A->H->server_port, errstr, errno, strerror(errcode));
return;
}
for (a = ai; (a != NULL) && (A->server_socket < 0); a = a->ai_next) {
errstr = "socket formation failed";
A->server_socket =
socket(a->ai_family, a->ai_socktype,
a->ai_protocol);
errcode = errno;
if (A->server_socket < 0) {
if (debug) printf("aprsis failed to open socket.\n");
continue;
}
if(debug) {
char addrstr[INET6_ADDRSTRLEN];
void *sin_ptr = NULL;
switch (a->ai_family) {
case AF_INET:
sin_ptr = &((struct sockaddr_in *) a->ai_addr)->sin_addr;
break;
case AF_INET6:
sin_ptr = &((struct sockaddr_in6 *) a->ai_addr)->sin6_addr;
break;
}
inet_ntop (a->ai_family, sin_ptr, addrstr, INET6_ADDRSTRLEN);
printf("aprsis connection attempt IPv%d address: %s\n",
(a->ai_family == PF_INET6) ? 6 : 4, addrstr);
}
errstr = "connection failed";
i = connect(A->server_socket, a->ai_addr, a->ai_addrlen);
errcode = errno;
if (i < 0) {
if (debug) printf("aprsis connection failed.\n");
/* If connection fails, try next possible address */
close(A->server_socket);
A->server_socket = -1;
continue;
}
}
if (A->server_socket < 0)
goto fail_out;
freeaddrinfo(ai);
ai = NULL;
timetick(); // unpredictable time since system did last poll..
if (time_reset) {
if (debug) printf("In time_reset mode, no touching yet!\n");
A->next_reconnect = tick.tv_sec + 10;
return;
}
aprxlog("CONNECT APRSIS %s:%s",
A->H->server_name, A->H->server_port);
/* From now the socket will be non-blocking for its entire lifetime.. */
fd_nonblockingmode(A->server_socket);
/* We do at first sync writing of login, and such.. */
s = aprsislogincmd;
s += sprintf(s, "user %s pass %s vers %s %s", A->H->login,
A->H->pass, swname, swversion);
if (A->H->filterparam)
s += sprintf(s, " filter %s", A->H->filterparam);
A->last_read = tick.tv_sec;
aprsis_queue_(A, NULL, qTYPE_LOCALGEN, "", aprsislogincmd, strlen(aprsislogincmd));
return; /* just a place-holder */
}
// APRS-IS communicator
static int aprsis_sockreadline(struct aprsis *A)
{
int i, c;
/* Reads multiple lines from buffer,
Last one is left into incomplete state */
for (i = A->rdbuf_cur; i < A->rdbuf_len; ++i) {
c = 0xFF & (A->rdbuf[i]);
if (c == '\r' || c == '\n') {
/* End of line, process.. */
if (A->rdlin_len > 0) {
A->rdline[A->rdlin_len] = 0;
/* */
A->last_read = tick.tv_sec; /* Time stamp me ! */
if (log_aprsis)
aprxlog(A->rdline, A->rdlin_len,
">> %s:%s >> ", A->H->server_name, A->H->server_port);
/* Send the A->rdline content to main program */
c = send(aprsis_up, A->rdline, A->rdlin_len, 0);
/* This may fail with SIGPIPE.. */
if (c < 0 && (errno == EPIPE ||
errno == ECONNRESET ||
errno == ECONNREFUSED ||
errno == ENOTCONN)) {
die_now = 1; // upstream socket send failed
}
}
A->rdlin_len = 0;
continue;
}
if (A->rdlin_len < sizeof(A->rdline) - 2) {
A->rdline[A->rdlin_len++] = c;
}
}
A->rdbuf_cur = 0;
A->rdbuf_len = 0; /* we ignore line reading */
return 0; /* .. this is placeholder.. */
}
// APRS-IS communicator
static int aprsis_sockread(struct aprsis *A)
{
int i;
int rdspace = sizeof(A->rdbuf) - A->rdbuf_len;
if (A->rdbuf_cur > 0) {
/* Read-out cursor is not at block beginning,
is there unread data too ? */
if (A->rdbuf_cur > A->rdbuf_len) {
memcpy(A->rdbuf, A->rdbuf + A->rdbuf_cur,
A->rdbuf_len - A->rdbuf_cur);
A->rdbuf_len -= A->rdbuf_cur;
} else
A->rdbuf_len = 0; /* all processed, mark its size zero */
A->rdbuf_cur = 0;
/* recalculate */
rdspace = sizeof(A->rdbuf) - A->rdbuf_len;
}
i = read(A->server_socket, A->rdbuf + A->rdbuf_len, rdspace);
if (i > 0) {
A->rdbuf_len += i;
/* we just ignore the readback.. but do time-stamp the event */
A->last_read = tick.tv_sec;
aprsis_sockreadline(A);
}
return i;
}
struct aprsis_tx_msg_head {
time_t then;
int addrlen;
int gwlen;
int textlen;
char qtype;
};
/*
* Read frame from a socket in between main-program and
* APRS-IS interface subprogram. (At APRS-IS side.)
*
*/
// APRS-IS communicator
static void aprsis_readup(void)
{
int i;
char buf[10000];
const char *addr;
const char *gwcall;
const char *text;
int textlen;
struct aprsis_tx_msg_head head;
i = recv(aprsis_up, buf, sizeof(buf), 0);
if (i == 0) { /* EOF ! */
if (debug>1) printf("Upstream fd read resulted eof status.\n");
die_now = 1;
return;
}
if (i < 0) {
return; /* Whatever was the reason.. */
}
buf[i] = 0; /* String Termination NUL byte */
memcpy(&head, buf, sizeof(head));
addr = buf + sizeof(head);
gwcall = addr + head.addrlen + 1;
text = gwcall + head.gwlen + 1;
textlen = head.textlen;
if (head.then + 10 < tick.tv_sec) {
return; /* Too old, discard */
// rflog();
}
if (textlen <= 2) {
return; // BAD!
}
if ((text + textlen) > (buf + i)) {
return; // BAD!
}
/*
printf("addrlen=%d addr=%s\n",head.addrlen, addr);
printf("gwlen=%d gwcall=%s\n",head.gwlen,gwcall);
printf("textlen=%d text=%s",head.textlen, text);
return;
*/
/* Now queue the thing! */
if (AprsIS != NULL)
aprsis_queue_(AprsIS, addr, head.qtype, gwcall, text, textlen);
}
// main program side
int aprsis_queue(const char *addr, int addrlen, const char qtype, const char *gwcall, const char *text, int textlen)
{
static char *buf; /* Dynamically allocated buffer... */
static int buflen;
int i, len, gwlen = strlen(gwcall);
char *p;
struct aprsis_tx_msg_head head;
int newlen;
// dupe_record_t *dp;
if (aprsis_down < 0) return -1; // No socket!
if (addrlen == 0) /* should never be... */
addrlen = strlen(addr);
// if (aprsis_rx_dupecheck != NULL) {
// dp = dupecheck_aprs( aprsis_rx_dupecheck,
// addr, addrlen,
// text, textlen );
// if (dp != NULL) return 1; // Bad either as dupe, or due to alloc failure
// }
newlen = sizeof(head) + addrlen + gwlen + textlen + 6;
if (newlen > buflen) {
buflen = newlen;
buf = realloc(buf, buflen);
memset(buf, 0, buflen); // (re)init it to silence valgrind
}
memset(&head, 0, sizeof(head));
head.then = tick.tv_sec;
head.addrlen = addrlen;
head.gwlen = gwlen;
head.textlen = textlen;
head.qtype = qtype;
memcpy(buf, &head, sizeof(head));
p = buf + sizeof(head);
memcpy(p, addr, addrlen);
p += addrlen;
*p++ = 0; /* string terminating 0 byte */
memcpy(p, gwcall, gwlen);
p += gwlen;
*p++ = 0; /* string terminating 0 byte */
memcpy(p, text, textlen);
p += textlen;
len = p - buf;
*p++ = 0;
#ifndef MSG_NOSIGNAL
# define MSG_NOSIGNAL 0 /* This exists only on Linux */
#endif
i = send(aprsis_down, buf, len, MSG_NOSIGNAL); /* No SIGPIPE if the
receiver is out,
or pipe is full
because it is doing
slow reconnection. */
return (i != len);
/* Return 0 if ANY of the queue operations was successfull
Return 1 if there was some error.. */
}
// APRS-IS communicator
static int aprsis_prepoll_(struct aprxpolls *app)
{
struct pollfd *pfd;
struct aprsis *A = AprsIS;
if (A->last_read == 0)
A->last_read = tick.tv_sec; /* mark it non-zero.. */
if (A->server_socket < 0)
return -1; /* Not open, do nothing */
if (debug>3) printf("aprsis_prepoll_()\n");
if (time_reset) {
aprsis_close(A, "time_reset!");
}
/* Not all aprs-is systems send "heartbeat", but when they do.. */
if ((A->H->heartbeat_monitor_timeout > 0) &&
((A->last_read + A->H->heartbeat_monitor_timeout - tick.tv_sec) < 0)) {
/*
* More than 120 seconds (2 minutes) since last time
* that APRS-IS systems told us something on the connection.
* There is a heart-beat ticking every 20 or so seconds.
*/
aprsis_close(A, "heartbeat timeout");
}
/* FD is open, lets mark it for poll read.. */
pfd = aprxpolls_new(app);
pfd->fd = A->server_socket;
pfd->events = POLLIN | POLLPRI | POLLERR | POLLHUP;
pfd->revents = 0;
/* Do we have something for writing ? */
if (A->wrbuf_len) {
pfd->events |= POLLOUT;
}
return 0;
}
// APRS-IS communicator
static int aprsis_postpoll_(struct aprxpolls *app)
{
int i;
struct pollfd *pfd = app->polls;
struct aprsis *A = AprsIS;
if (debug>3) printf("aprsis_postpoll_() cnt=%d\n", app->pollcount);
for (i = 0; i < app->pollcount; ++i, ++pfd) {
if (pfd->fd == A->server_socket && pfd->fd >= 0) {
/* This is APRS-IS socket, and we may have some results.. */
if (pfd->revents & (POLLERR)) { /* Errors ? */
aprsis_close(A,"postpoll_ POLLERR");
continue;
}
if (pfd->revents & (POLLHUP)) { /* Errors ? */
aprsis_close(A,"postpoll_ POLLHUP");
continue;
}
if (pfd->revents & (POLLIN | POLLPRI)) { /* Ready for reading */
for (;;) {
i = aprsis_sockread(A);
if (i == 0) { /* EOF ! */
aprsis_close(A,"postpoll_ EOF");
continue;
}
if (i < 0)
break;
}
}
if (pfd->revents & POLLOUT) { /* Ready for writing */
/* Normal queue write processing */
if (A->wrbuf_len > 0 &&
A->wrbuf_cur < A->wrbuf_len) {
i = write(A->server_socket,
A->wrbuf +
A->wrbuf_cur,
A->wrbuf_len -
A->wrbuf_cur);
if (debug>2)
printf("%ld << %s:%s << write() rc= %d\n",
tick.tv_sec, A->H->server_name, A->H->server_port, i);
if (i < 0)
continue; /* Argh.. nothing */
// if (i == 0); /* What ? */
if (log_aprsis)
aprxlog(A->wrbuf + A->wrbuf_cur,
(A->wrbuf_len - A->wrbuf_cur) -1,
"<< %s:%s << ", A->H->server_name,
A->H->server_port);
A->wrbuf_cur += i;
if (A->wrbuf_cur >= A->wrbuf_len) { /* Wrote all! */
A->wrbuf_len = A->wrbuf_cur = 0;
} else {
/* partial write .. do nothing.. */
}
}
/* .. normal queue */
} /* .. POLLOUT */
} /* .. if fd == server_socket */
} /* .. for .. nfds .. */
return 1; /* there was something we did, maybe.. */
}
// APRS-IS communicator
static void aprsis_cond_reconnect(void)
{
if (AprsIS && /* First time around it may trip.. */
AprsIS->server_socket < 0 && (AprsIS->next_reconnect - tick.tv_sec) <= 0) {
aprsis_reconnect(AprsIS);
}
}
/*
* Main-loop of subprogram handling communication with
* APRS-IS network servers.
*
* This starts only when we have at least one <aprsis> defined without errors.
*/
// APRS-IS communicator
static void aprsis_main(void)
{
#if !(defined(HAVE_PTHREAD_CREATE) && defined(ENABLE_PTHREAD))
int ppid = getppid();
#endif
struct aprxpolls app = APRXPOLLS_INIT;
#if !(defined(HAVE_PTHREAD_CREATE) && defined(ENABLE_PTHREAD))
signal(SIGHUP, sig_handler);
signal(SIGPIPE, SIG_IGN);
#endif
/* The main loop */
while (!die_now) {
struct pollfd *pfd;
timetick();
aprsis_cond_reconnect(); // may take unpredictable time..
timetick();
#if !(defined(HAVE_PTHREAD_CREATE) && defined(ENABLE_PTHREAD))
// Parent-pid makes no sense in threaded setup
int i;
i = getppid();
if (i != ppid)
break; /* die now, my parent is gone.. */
if (i == 1)
break; /* a safety fallback case.. */
#endif
aprxpolls_reset(&app);
tv_timeradd_seconds( &app.next_timeout, &tick, 5 );
if (aprsis_up >= 0) {
pfd = aprxpolls_new(&app);
pfd->fd = aprsis_up;
pfd->events = POLLIN | POLLPRI | POLLERR | POLLHUP;
pfd->revents = 0;
}
aprsis_prepoll_(&app);
// Prepolls are done
time_reset = 0;
if (tv_timercmp(&app.next_timeout, &tick) <= 0) {
tv_timeradd_seconds( &app.next_timeout, &tick, 1 ); // Just to be on safe side..
}
poll(app.polls, app.pollcount, aprxpolls_millis(&app));
timetick();
assert(app.polls != NULL);
if (app.polls[0].
revents & (POLLIN | POLLPRI | POLLERR | POLLHUP)) {
/* messaging channel has something for us, if
the channel reports EOF, we exit there and then. */
aprsis_readup();
}
aprsis_postpoll_(&app);
}
aprxpolls_free(&app); // valgrind..
/* Got "DIE NOW" signal... */
// exit(0);
}
/*
* aprsis_add_server() - old style configuration
*/
int aprsis_add_server(const char *server, const char *port)
{
struct aprsis_host *H;
if (AprsIS == NULL) {
AprsIS = calloc(1,sizeof(*AprsIS));
}
H = calloc(1,sizeof(*H));
AISh = realloc(AISh, sizeof(AISh[0]) * (AIShcount + 1));
AISh[AIShcount] = H;
++AIShcount;
/* No inc on AprsIScount */
H->server_name = strdup(server);
H->server_port = strdup(port);
H->heartbeat_monitor_timeout = 120; // Default timeout 120 seconds
H->login = strdup(aprsis_login); // global aprsis_login
H->pass = default_passcode;
if (H->login == NULL) H->login = strdup(mycall);
AprsIS->server_socket = -1;
AprsIS->next_reconnect = tick.tv_sec +10; /* perhaps somewhen latter.. */
return 0;
}
// old style configuration
int aprsis_set_heartbeat_timeout(const int tout)
{
int i = AIShcount;
struct aprsis_host *H;
if (i > 0)
--i;
H = AISh[i];
H->heartbeat_monitor_timeout = tout;
return 0;
}
// old style configuration
int aprsis_set_filter(const char *filter)
{
int i = AIShcount;
struct aprsis_host *H;
if (i > 0)
--i;
H = AISh[i];
H->filterparam = strdup(filter);
return 0;
}
// old style configuration
int aprsis_set_login(const char *login)
{
int i = AIShcount;
struct aprsis_host *H;
if (i > 0)
--i;
H = AISh[i];
H->login = strdup(login);
return 0;
}
#if defined(HAVE_PTHREAD_CREATE) && defined(ENABLE_PTHREAD)
static void aprsis_runthread(void)
{
sigset_t sigs_to_block;
sigemptyset(&sigs_to_block);
sigaddset(&sigs_to_block, SIGALRM);
sigaddset(&sigs_to_block, SIGINT);
sigaddset(&sigs_to_block, SIGTERM);
sigaddset(&sigs_to_block, SIGQUIT);
sigaddset(&sigs_to_block, SIGHUP);
sigaddset(&sigs_to_block, SIGURG);
sigaddset(&sigs_to_block, SIGPIPE);
sigaddset(&sigs_to_block, SIGUSR1);
pthread_sigmask(SIG_BLOCK, &sigs_to_block, NULL);
// generally the cancelability is enabled
pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL);
if (debug) printf("aprsis_runthread()\n");
aprsis_main();
}
void aprsis_start(void)
{
int i;
int pipes[2];
if (AISh == NULL || AprsIS == NULL) {
fprintf(stderr,"***** NO APRSIS SERVER CONNECTION DEFINED *****");
return;
}
i = socketpair(AF_UNIX, SOCK_DGRAM, PF_UNSPEC, pipes);
if (i != 0) {
return; /* FAIL ! */
}
fd_nonblockingmode(pipes[0]);
fd_nonblockingmode(pipes[1]);
aprsis_down = pipes[0];
aprsis_up = pipes[1];
if (debug)printf("aprsis_start() PTHREAD socketpair(up=%d,down=%d)\n", aprsis_up, aprsis_down);
pthread_attr_init(&pthr_attrs);
/* 64 kB stack is enough for this thread (I hope!)
default of 2 MB is way too much...*/
pthread_attr_setstacksize(&pthr_attrs, 64*1024);
i = pthread_create(&aprsis_thread, &pthr_attrs, (void*)aprsis_runthread, NULL);
if (i == 0) {
if (debug) printf("APRSIS pthread_create() OK!\n");
} else { // FAIL!
close(pipes[0]);
close(pipes[1]);
aprsis_down = -1;
aprsis_up = -1;
}
}
// Shutdown the aprsis thread
void aprsis_stop(void)
{
die_now = 1;
pthread_cancel(aprsis_thread);
pthread_join(aprsis_thread, NULL);
}
#else // No pthread(3p)
void aprsis_start(void)
{
int i;
int pipes[2];
if (AISh == NULL || AprsIS == NULL) {
fprintf(stderr,"***** NO APRSIS SERVER CONNECTION DEFINED *****");
return;
}
i = socketpair(AF_UNIX, SOCK_DGRAM, PF_UNSPEC, pipes);
if (i != 0) {
return; /* FAIL ! */
}
i = fork();
if (i < 0) {
close(pipes[0]);
close(pipes[1]);
return; /* FAIL ! */
}
if (i == 0) {
/* Child -- the APRSIS talker */
aprsis_up = pipes[1];
fd_nonblockingmode(pipes[1]);
close(pipes[0]);
aprsis_main();
exit(0);
}
/* Parent */
close(pipes[1]);