static void handle(int incoming, struct sockaddr *addr, int addrlen)
{
pid_t pid;
if (max_connections && live_children >= max_connections) {
kill_some_child();
sleep(1); /* give it some time to die */
check_dead_children();
if (live_children >= max_connections) {
close(incoming);
logerror("Too many children, dropping connection");
return;
}
}
if ((pid = fork())) {
close(incoming);
if (pid < 0) {
logerror("Couldn't fork %s", strerror(errno));
return;
}
add_child(pid, addr, addrlen);
return;
}
dup2(incoming, 0);
dup2(incoming, 1);
close(incoming);
exit(execute(addr));
}
static int service_loop(int socknum, int *socklist)
{
struct pollfd *pfd;
int i;
pfd = xcalloc(socknum, sizeof(struct pollfd));
for (i = 0; i < socknum; i++) {
pfd[i].fd = socklist[i];
pfd[i].events = POLLIN;
}
signal(SIGCHLD, child_handler);
for (;;) {
int i;
int timeout;
/*
* This 1-sec timeout could lead to idly looping but it is
* here so that children culled in child_handler() are reported
* without too much delay. We could probably set up a pipe
* to ourselves that we poll, and write to the fd from child_handler()
* to wake us up (and consume it when the poll() returns...
*/
timeout = (children_spawned != children_deleted) ? 1000 : -1;
i = poll(pfd, socknum, timeout);
if (i < 0) {
if (errno != EINTR) {
error("poll failed, resuming: %s",
strerror(errno));
sleep(1);
}
continue;
}
if (i == 0) {
check_dead_children();
continue;
}
for (i = 0; i < socknum; i++) {
if (pfd[i].revents & POLLIN) {
struct sockaddr_storage ss;
unsigned int sslen = sizeof(ss);
int incoming = accept(pfd[i].fd, (struct sockaddr *)&ss, &sslen);
if (incoming < 0) {
switch (errno) {
case EAGAIN:
case EINTR:
case ECONNABORTED:
continue;
default:
die("accept returned %s", strerror(errno));
}
}
handle(incoming, (struct sockaddr *)&ss, sslen);
}
}
}
}
static void check_max_connections(void)
{
for (;;) {
int active;
unsigned spawned, deleted;
check_dead_children();
spawned = children_spawned;
deleted = children_deleted;
active = spawned - deleted;
if (active <= max_connections)
break;
/* Kill some unstarted connections with SIGTERM */
kill_some_children(SIGTERM, deleted, spawned);
if (active <= max_connections << 1)
break;
/* If the SIGTERM thing isn't helping use SIGKILL */
kill_some_children(SIGKILL, deleted, spawned);
sleep(1);
}
}
static int service_loop(struct socketlist *socklist)
{
struct pollfd *pfd;
int i;
pfd = xcalloc(socklist->nr, sizeof(struct pollfd));
for (i = 0; i < socklist->nr; i++) {
pfd[i].fd = socklist->list[i];
pfd[i].events = POLLIN;
}
signal(SIGCHLD, child_handler);
for (;;) {
int i;
check_dead_children();
if (poll(pfd, socklist->nr, -1) < 0) {
if (errno != EINTR) {
logerror("Poll failed, resuming: %s",
strerror(errno));
sleep(1);
}
continue;
}
for (i = 0; i < socklist->nr; i++) {
if (pfd[i].revents & POLLIN) {
union {
struct sockaddr sa;
struct sockaddr_in sai;
#ifndef NO_IPV6
struct sockaddr_in6 sai6;
#endif
} ss;
socklen_t sslen = sizeof(ss);
int incoming = accept(pfd[i].fd, &ss.sa, &sslen);
if (incoming < 0) {
switch (errno) {
case EAGAIN:
case EINTR:
case ECONNABORTED:
continue;
default:
die_errno("accept returned");
}
}
handle(incoming, &ss.sa, sslen);
}
}
}
}
static void handle(int incoming, struct sockaddr *addr, socklen_t addrlen)
{
struct child_process cld = { NULL };
char addrbuf[300] = "REMOTE_ADDR=", portbuf[300];
char *env[] = { addrbuf, portbuf, NULL };
if (max_connections && live_children >= max_connections) {
kill_some_child();
sleep(1); /* give it some time to die */
check_dead_children();
if (live_children >= max_connections) {
close(incoming);
logerror("Too many children, dropping connection");
return;
}
}
if (addr->sa_family == AF_INET) {
struct sockaddr_in *sin_addr = (void *) addr;
inet_ntop(addr->sa_family, &sin_addr->sin_addr, addrbuf + 12,
sizeof(addrbuf) - 12);
snprintf(portbuf, sizeof(portbuf), "REMOTE_PORT=%d",
ntohs(sin_addr->sin_port));
#ifndef NO_IPV6
} else if (addr && addr->sa_family == AF_INET6) {
struct sockaddr_in6 *sin6_addr = (void *) addr;
char *buf = addrbuf + 12;
*buf++ = '['; *buf = '\0'; /* stpcpy() is cool */
inet_ntop(AF_INET6, &sin6_addr->sin6_addr, buf,
sizeof(addrbuf) - 13);
strcat(buf, "]");
snprintf(portbuf, sizeof(portbuf), "REMOTE_PORT=%d",
ntohs(sin6_addr->sin6_port));
#endif
}
cld.env = (const char **)env;
cld.argv = (const char **)cld_argv;
cld.in = incoming;
cld.out = dup(incoming);
if (start_command(&cld))
logerror("unable to fork");
else
add_child(&cld, addr, addrlen);
close(incoming);
}
static int service_loop(int socknum, int *socklist)
{
struct pollfd *pfd;
int i;
pfd = xcalloc(socknum, sizeof(struct pollfd));
for (i = 0; i < socknum; i++) {
pfd[i].fd = socklist[i];
pfd[i].events = POLLIN;
}
signal(SIGCHLD, child_handler);
for (;;) {
int i;
check_dead_children();
if (poll(pfd, socknum, -1) < 0) {
if (errno != EINTR) {
logerror("Poll failed, resuming: %s",
strerror(errno));
sleep(1);
}
continue;
}
for (i = 0; i < socknum; i++) {
if (pfd[i].revents & POLLIN) {
struct sockaddr_storage ss;
unsigned int sslen = sizeof(ss);
int incoming = accept(pfd[i].fd, (struct sockaddr *)&ss, &sslen);
if (incoming < 0) {
switch (errno) {
case EAGAIN:
case EINTR:
case ECONNABORTED:
continue;
default:
die_errno("accept returned");
}
}
handle(incoming, (struct sockaddr *)&ss, sslen);
}
}
}
}
static void handle(int incoming, struct sockaddr *addr, socklen_t addrlen)
{
struct child_process cld = CHILD_PROCESS_INIT;
if (max_connections && live_children >= max_connections) {
kill_some_child();
sleep(1); /* give it some time to die */
check_dead_children();
if (live_children >= max_connections) {
close(incoming);
logerror("Too many children, dropping connection");
return;
}
}
if (addr->sa_family == AF_INET) {
char buf[128] = "";
struct sockaddr_in *sin_addr = (void *) addr;
inet_ntop(addr->sa_family, &sin_addr->sin_addr, buf, sizeof(buf));
argv_array_pushf(&cld.env_array, "REMOTE_ADDR=%s", buf);
argv_array_pushf(&cld.env_array, "REMOTE_PORT=%d",
ntohs(sin_addr->sin_port));
#ifndef NO_IPV6
} else if (addr->sa_family == AF_INET6) {
char buf[128] = "";
struct sockaddr_in6 *sin6_addr = (void *) addr;
inet_ntop(AF_INET6, &sin6_addr->sin6_addr, buf, sizeof(buf));
argv_array_pushf(&cld.env_array, "REMOTE_ADDR=[%s]", buf);
argv_array_pushf(&cld.env_array, "REMOTE_PORT=%d",
ntohs(sin6_addr->sin6_port));
#endif
}
cld.argv = cld_argv.argv;
cld.in = incoming;
cld.out = dup(incoming);
if (start_command(&cld))
logerror("unable to fork");
else
add_child(&cld, addr, addrlen);
}