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Code Issues Releases Wiki Activity

Hard limit number of sessions to 1000

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This commit is contained in:
M66B 2017-07-21 06:23:34 +02:00
parent d742b42f51
commit 1d70a9e6a1
1 changed files with 18 additions and 32 deletions
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50
app/src/main/jni/netguard/session.c
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@ -67,6 +67,8 @@ void *handle_events(void *a) {
log_android(ANDROID_LOG_WARN, "getrlimit soft %d hard %d max sessions %d",
rlim.rlim_cur, rlim.rlim_max, maxsessions);
maxsessions = (int) (rlim.rlim_cur * SESSION_LIMIT / 100);
if (maxsessions > 1000)
maxsessions = 1000;
// Terminate existing sessions not allowed anymore
check_allowed(args);
@ -120,12 +122,10 @@ void *handle_events(void *a) {
if (s->protocol == IPPROTO_ICMP || s->protocol == IPPROTO_ICMPV6) {
if (!s->icmp.stop)
isessions++;
}
else if (s->protocol == IPPROTO_UDP) {
} else if (s->protocol == IPPROTO_UDP) {
if (s->udp.state == UDP_ACTIVE)
usessions++;
}
else if (s->protocol == IPPROTO_TCP) {
} else if (s->protocol == IPPROTO_TCP) {
if (s->tcp.state != TCP_CLOSING && s->tcp.state != TCP_CLOSE)
tsessions++;
if (s->socket >= 0)
@ -153,8 +153,7 @@ void *handle_events(void *a) {
if (stimeout > 0 && stimeout < timeout)
timeout = stimeout;
}
}
else if (s->protocol == IPPROTO_UDP) {
} else if (s->protocol == IPPROTO_UDP) {
del = check_udp_session(args, s, sessions, maxsessions);
if (s->udp.state == UDP_ACTIVE && !del) {
int stimeout = s->udp.time +
@ -162,8 +161,7 @@ void *handle_events(void *a) {
if (stimeout > 0 && stimeout < timeout)
timeout = stimeout;
}
}
else if (s->protocol == IPPROTO_TCP) {
} else if (s->protocol == IPPROTO_TCP) {
del = check_tcp_session(args, s, sessions, maxsessions);
if (s->tcp.state != TCP_CLOSING && s->tcp.state != TCP_CLOSE && !del) {
int stimeout = s->tcp.time +
@ -184,14 +182,12 @@ void *handle_events(void *a) {
if (c->protocol == IPPROTO_TCP)
clear_tcp_data(&c->tcp);
free(c);
}
else {
} else {
sl = s;
s = s->next;
}
}
}
else {
} else {
recheck = 1;
log_android(ANDROID_LOG_DEBUG, "Skipped session checks");
}
@ -210,8 +206,7 @@ void *handle_events(void *a) {
log_android(ANDROID_LOG_DEBUG,
"epoll interrupted tun %d thread %x", args->tun, thread_id);
continue;
}
else {
} else {
log_android(ANDROID_LOG_ERROR,
"epoll tun %d thread %x error %d: %s",
args->tun, thread_id, errno, strerror(errno));
@ -242,8 +237,7 @@ void *handle_events(void *a) {
log_android(ANDROID_LOG_WARN, "Read pipe");
break;
}
else if (ev[i].data.ptr == NULL) {
} else if (ev[i].data.ptr == NULL) {
// Check upstream
log_android(ANDROID_LOG_DEBUG, "epoll ready %d/%d in %d out %d err %d hup %d",
i, ready,
@ -256,8 +250,7 @@ void *handle_events(void *a) {
if (check_tun(args, &ev[i], epoll_fd, sessions, maxsessions) < 0)
error = 1;
}
else {
} else {
// Check downstream
log_android(ANDROID_LOG_DEBUG,
"epoll ready %d/%d in %d out %d err %d hup %d prot %d sock %d",
@ -277,8 +270,7 @@ void *handle_events(void *a) {
while (!(ev[i].events & EPOLLERR) && (ev[i].events & EPOLLIN) &&
is_readable(session->socket))
check_udp_socket(args, &ev[i]);
}
else if (session->protocol == IPPROTO_TCP)
} else if (session->protocol == IPPROTO_TCP)
check_tcp_socket(args, &ev[i], epoll_fd);
}
@ -326,8 +318,7 @@ void check_allowed(const struct arguments *args) {
if (s->icmp.version == 4) {
inet_ntop(AF_INET, &s->icmp.saddr.ip4, source, sizeof(source));
inet_ntop(AF_INET, &s->icmp.daddr.ip4, dest, sizeof(dest));
}
else {
} else {
inet_ntop(AF_INET6, &s->icmp.saddr.ip6, source, sizeof(source));
inet_ntop(AF_INET6, &s->icmp.daddr.ip6, dest, sizeof(dest));
}
@ -342,14 +333,12 @@ void check_allowed(const struct arguments *args) {
}
}
}
else if (s->protocol == IPPROTO_UDP) {
} else if (s->protocol == IPPROTO_UDP) {
if (s->udp.state == UDP_ACTIVE) {
if (s->udp.version == 4) {
inet_ntop(AF_INET, &s->udp.saddr.ip4, source, sizeof(source));
inet_ntop(AF_INET, &s->udp.daddr.ip4, dest, sizeof(dest));
}
else {
} else {
inet_ntop(AF_INET6, &s->udp.saddr.ip6, source, sizeof(source));
inet_ntop(AF_INET6, &s->udp.daddr.ip6, dest, sizeof(dest));
}
@ -362,8 +351,7 @@ void check_allowed(const struct arguments *args) {
log_android(ANDROID_LOG_WARN, "UDP terminate session socket %d uid %d",
s->socket, s->udp.uid);
}
}
else if (s->udp.state == UDP_BLOCKED) {
} else if (s->udp.state == UDP_BLOCKED) {
log_android(ANDROID_LOG_WARN, "UDP remove blocked session uid %d", s->udp.uid);
if (l == NULL)
@ -377,14 +365,12 @@ void check_allowed(const struct arguments *args) {
continue;
}
}
else if (s->protocol == IPPROTO_TCP) {
} else if (s->protocol == IPPROTO_TCP) {
if (s->tcp.state != TCP_CLOSING && s->tcp.state != TCP_CLOSE) {
if (s->tcp.version == 4) {
inet_ntop(AF_INET, &s->tcp.saddr.ip4, source, sizeof(source));
inet_ntop(AF_INET, &s->tcp.daddr.ip4, dest, sizeof(dest));
}
else {
} else {
inet_ntop(AF_INET6, &s->tcp.saddr.ip6, source, sizeof(source));
inet_ntop(AF_INET6, &s->tcp.daddr.ip6, dest, sizeof(dest));
}