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Code Issues Releases Wiki Activity

Correct maximum messages sizes

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This commit is contained in:
M66B 2016-02-03 07:58:25 +01:00
parent 87da34c19d
commit 1b7e0966e7
2 changed files with 20 additions and 9 deletions
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23
app/src/main/jni/netguard/netguard.c
View file

@ -766,9 +766,11 @@ int check_tun(const struct arguments *args, fd_set *rfds, fd_set *wfds, fd_set *
// Check tun read
if (FD_ISSET(args->tun, rfds)) {
uint8_t buffer[TUN_MAXMSG];
ssize_t length = read(args->tun, buffer, sizeof(buffer));
uint8_t *buffer = malloc(TUN_MAXMSG);
ssize_t length = read(args->tun, buffer, TUN_MAXMSG);
if (length < 0) {
free(buffer);
log_android(ANDROID_LOG_ERROR, "tun read error %d: %s", errno, strerror(errno));
if (errno == EINTR || errno == EAGAIN)
return 0;
@ -784,9 +786,13 @@ int check_tun(const struct arguments *args, fd_set *rfds, fd_set *wfds, fd_set *
// Handle IP from tun
handle_ip(args, buffer, (size_t) length);
free(buffer);
}
else {
// tun eof
free(buffer);
log_android(ANDROID_LOG_ERROR, "tun %d empty read", args->tun);
report_exit(args, "tun %d empty read", args->tun);
return -1;
@ -820,8 +826,9 @@ void check_icmp_sockets(const struct arguments *args, fd_set *rfds, fd_set *wfds
if (FD_ISSET(cur->socket, rfds)) {
cur->time = time(NULL);
uint8_t buffer[ICMP4_MAXMSG]; // TODO ICMPv6 length
ssize_t bytes = recv(cur->socket, buffer, sizeof(buffer), 0);
uint16_t blen = cur->version == 4 ? ICMP4_MAXMSG : ICMP6_MAXMSG;
uint8_t *buffer = malloc(blen);
ssize_t bytes = recv(cur->socket, buffer, blen, 0);
if (bytes < 0) {
// Socket error
log_android(ANDROID_LOG_WARN, "ICMP recv error %d: %s",
@ -874,6 +881,7 @@ void check_icmp_sockets(const struct arguments *args, fd_set *rfds, fd_set *wfds
if (write_icmp(args, cur, buffer, (size_t) bytes) < 0)
cur->stop = 1;
}
free(buffer);
}
}
}
@ -905,8 +913,9 @@ void check_udp_sockets(const struct arguments *args, fd_set *rfds, fd_set *wfds,
if (FD_ISSET(cur->socket, rfds)) {
cur->time = time(NULL);
uint8_t buffer[UDP4_MAXMSG]; // TODO UDPv6 length
ssize_t bytes = recv(cur->socket, buffer, sizeof(buffer), 0);
uint16_t blen = cur->version == 4 ? UDP4_MAXMSG : UDP6_MAXMSG;
uint8_t *buffer = malloc(blen);
ssize_t bytes = recv(cur->socket, buffer, blen, 0);
if (bytes < 0) {
// Socket error
log_android(ANDROID_LOG_WARN, "UDP recv error %d: %s",
@ -943,6 +952,7 @@ void check_udp_sockets(const struct arguments *args, fd_set *rfds, fd_set *wfds,
cur->stop = 1;
}
}
free(buffer);
}
}
}
@ -1189,7 +1199,6 @@ void check_tcp_sockets(const struct arguments *args, fd_set *rfds, fd_set *wfds,
if (write_data(args, cur, buffer, (size_t) bytes) >= 0)
cur->local_seq += bytes;
}
free(buffer);
}
}

6
app/src/main/jni/netguard/netguard.h
View file

@ -5,8 +5,10 @@
#define SELECT_TIMEOUT 10 // seconds
#define TUN_MAXMSG 32768 // bytes (device)
#define ICMP4_MAXMSG 65507 // bytes (socket)
#define UDP4_MAXMSG 65507 // bytes (socket)
#define ICMP4_MAXMSG (IP_MAXPACKET - 20 - 8) // bytes (socket)
#define ICMP6_MAXMSG (IPV6_MAXPACKET - 40 - 8) // bytes (socket)
#define UDP4_MAXMSG (IP_MAXPACKET - 20 - 8) // bytes (socket)
#define UDP6_MAXMSG (IPV6_MAXPACKET - 40 - 8) // bytes (socket)
#define ICMP_TIMEOUT 15 // seconds