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splif.c
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splif.c
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#include "splif.h"
/* Global variables initialization */
int spuf = -1;
pthread_mutex_t pmut = PTHREAD_MUTEX_INITIALIZER;
pthread_cond_t answ = PTHREAD_COND_INITIALIZER;
const char *signa = SIGNATUR;
int
main(int argc, char **argv)
{
char *ptr;
int sfd, n, fda;
const int on = 1;
sigset_t set;
pthread_t tid;
struct epoll_event ev = {.events = EPOLLIN};
struct timespec tp;
if (argc < 3) {
fprintf(stderr, "\nUsage in private VM: %s <Splif host:port> <Private host:port>\
\nUsage in public VM: %s <Splif port> <Public port>\n\n", argv[0], argv[0]);
exit(EXIT_FAILURE);
}
daemonize();
if (sigemptyset(&set) < 0) {
syslog(LOG_ERR, "sigemtyset: %m");
} else {
if (sigaddset(&set, SIGPIPE) < 0) {
syslog(LOG_ERR, "sigaddset: %m");
} else {
if ( (errno = pthread_sigmask(SIG_BLOCK, &set, NULL)) != 0)
syslog(LOG_ERR, "sigmask: %m");
}
}
if ( (efd = epoll_create(EPOLLCNK)) < 0) {
syslog(LOG_CRIT, "epoll create: %m");
_exit(EXIT_FAILURE);
}
if ( (errno = pthread_create(&tid, NULL, mill, NULL)) != 0) {
syslog(LOG_CRIT, "mill create: %m");
_exit(EXIT_FAILURE);
}
if ( (ptr = rindex(argv[1], ':')) != NULL) {
s_host = argv[1];
s_port = ptr + 1;
*ptr = '\0';
if ( (ptr = rindex(argv[2], ':')) == NULL) {
syslog(LOG_CRIT, "Bad argument: %s", argv[2]);
_exit(EXIT_FAILURE);
}
p_host = argv[2];
p_port = ptr + 1;
*ptr = '\0';
/* Code runs in private VM */
for (;;) {
while ( (sfd = tcp_connect(s_host, s_port)) < 0) sleep(PINGTIME);
if (setsockopt(sfd, SOL_SOCKET, SO_KEEPALIVE, &on, sizeof on) < 0)
syslog(LOG_ERR, "can't set keepalive: %m");
if (send(sfd, signa, sizeof cbuf, 0) < 0) {
syslog(LOG_ERR, "sigsend: %m");
conres(sfd);
continue;
}
armed: while ( (n = recv(sfd, &cbuf, sizeof cbuf, 0)) < 0 && errno == EINTR);
if (n < 0) {
syslog(LOG_ERR, "prirecv from splif: %m");
conres(sfd);
continue;
}
if (n == 0) {
close(sfd);
continue;
}
if (n != sizeof cbuf) {
syslog(LOG_ERR, "prisplif inadequate input");
goto armed;
}
if ( (fda = tcp_connect(p_host, p_port)) < 0) {
// no logging as it's done inside tcp_tonnect()
goto armed;
}
if ( (fdb = tcp_connect(s_host, s_port)) < 0) {
// no logging as it's done inside tcp_tonnect()
conres(fda);
goto armed;
}
if (setsockopt(fdb, SOL_SOCKET, SO_KEEPALIVE, &on, sizeof on) < 0)
syslog(LOG_ERR, "keepalive on pri-to-pub: %m");
ev.data.u64 = fda;
ev.data.u64 <<= 32;
ev.data.u64 |= fdb;
if (epoll_ctl(efd, EPOLL_CTL_ADD, fdb, &ev) < 0) {
syslog(LOG_ERR, "prifdb epoll add: %m");
conres(fda);
conres(fdb);
goto armed;
}
ev.data.u64 = fdb;
ev.data.u64 <<= 32;
ev.data.u64 |= fda;
if (epoll_ctl(efd, EPOLL_CTL_ADD, fda, &ev) < 0) {
syslog(LOG_ERR, "prifda epoll add: %m");
conres(fda);
conres(fdb);
goto armed;
}
if (send(fdb, &cbuf, sizeof cbuf, 0) < 0) {
syslog(LOG_ERR, "prifinal send: %m");
conres(fda);
conres(fdb);
}
//syslog(LOG_ERR, "test error output"); // debug mode
//syslog(LOG_CRIT, "test critical output"); // debug mode
goto armed;
}
} else {
s_port = argv[1];
p_port = argv[2];
/* Code runs in public VM */
if ( (errno = pthread_create(&tid, NULL, splifguard, NULL)) != 0) {
syslog(LOG_CRIT, "splifguard create: %m");
_exit(EXIT_FAILURE);
}
sfd = tcp_listen(NULL, p_port); // listening socket
for (;;) {
while ( (fda = accept(sfd, NULL, NULL)) < 0 && errno == EINTR);
if (fda < 0) {
syslog(LOG_CRIT, "pubaccept: %m");
_exit(EXIT_FAILURE);
}
if (setsockopt(fda, IPPROTO_TCP, TCP_NODELAY, &on, sizeof on) < 0)
syslog(LOG_ERR, "pubaccept - can't disable Nagle: %m");
if (setsockopt(fda, SOL_SOCKET, SO_KEEPALIVE, &on, sizeof on) < 0)
syslog(LOG_ERR, "keepalive on usr-to-pub: %m");
pthread_mutex_lock(&pmut);
cbuf = fda;
if (send(spuf, &cbuf, sizeof cbuf, 0) != sizeof cbuf) {
syslog(LOG_ERR, "fda send incomplete, %m");
pthread_mutex_unlock(&pmut);
conres(fda);
continue;
}
clock_gettime(CLOCK_REALTIME_COARSE, &tp);
tp.tv_sec += XTIMEOUT;
while ( (n = pthread_cond_timedwait(&answ, &pmut, &tp)) != 0 && n == EINTR);
if (n != 0) { // TIMEDOUT only option
syslog(LOG_ERR, "private end timed out");
pthread_mutex_unlock(&pmut);
conres(fda);
continue;
}
ev.data.u64 = fda;
ev.data.u64 <<= 32;
ev.data.u64 |= fdb;
if (epoll_ctl(efd, EPOLL_CTL_ADD, fdb, &ev) < 0) goto puberr;
ev.data.u64 = fdb;
ev.data.u64 <<= 32;
ev.data.u64 |= fda;
if (epoll_ctl(efd, EPOLL_CTL_ADD, fda, &ev) < 0) goto puberr;
pthread_mutex_unlock(&pmut);
continue;
puberr: syslog(LOG_ERR, "epoll add public duo: %m");
conres(fda);
conres(fdb);
pthread_mutex_unlock(&pmut);
}
}
return 0;
}