int
default_handle_key(ui_t *ui, int key)
{
int action = -1;
// Check actions for this key
while ((action = key_find_action(key, action)) != ERR) {
// Check if we handle this action
switch (action) {
case ACTION_RESIZE_SCREEN:
ui_resize_panel(ui);
break;
case ACTION_TOGGLE_SYNTAX:
setting_toggle(SETTING_SYNTAX);
break;
case ACTION_TOGGLE_HINT:
setting_toggle(SETTING_ALTKEY_HINT);
break;
case ACTION_CYCLE_COLOR:
setting_toggle(SETTING_COLORMODE);
break;
case ACTION_SHOW_HOSTNAMES:
setting_toggle(SETTING_DISPLAY_HOST);
break;
case ACTION_SHOW_ALIAS:
setting_toggle(SETTING_DISPLAY_ALIAS);
break;
case ACTION_SHOW_SETTINGS:
ui_create_panel(PANEL_SETTINGS);
break;
case ACTION_TOGGLE_PAUSE:
// Pause/Resume capture
capture_set_paused(!capture_is_paused());
break;
case ACTION_SHOW_HELP:
ui_help(ui);
break;
case ACTION_PREV_SCREEN:
ui_destroy(ui);
break;
default:
// Parse next action
continue;
}
// Default handler has handled the key
break;
}
// Return this is a valid handled key
return (action == ERR) ? key : 0;
}
void
parse_packet(u_char *mode, const struct pcap_pkthdr *header, const u_char *packet)
{
// IP header data
struct ip *ip4;
#ifdef WITH_IPV6
// IPv6 header data
struct ip6_hdr *ip6;
#endif
// IP version
uint32_t ip_ver;
// IP protocol
uint8_t ip_proto;
// IP header size
uint32_t ip_hl = 0;
// Fragment offset
uint32_t ip_off = 0;
// Fragmentation flag
uint8_t ip_frag = 0;
// Fragmentation offset
uint16_t ip_frag_off = 0;
//! Source Address
char ip_src[ADDRESSLEN];
//! Destination Address
char ip_dst[ADDRESSLEN];
// Source and Destination Ports
u_short sport, dport;
// UDP header data
struct udphdr *udp;
// UDP header size
uint16_t udp_off;
// TCP header data
struct tcphdr *tcp;
// TCP header size
uint16_t tcp_off;
// Packet payload data
u_char *payload = NULL;
// Packet payload size
uint32_t size_payload = header->caplen;
// SIP message transport
int transport;
// Media structure for RTP packets
rtp_stream_t *stream;
// Captured packet info
capture_packet_t *pkt;
// Ignore packets while capture is paused
if (capture_is_paused())
return;
// Check if we have reached capture limit
if (capinfo.limit && sip_calls_count() >= capinfo.limit)
return;
// Get IP header
ip4 = (struct ip *) (packet + capinfo.link_hl);
#ifdef WITH_IPV6
// Get IPv6 header
ip6 = (struct ip6_hdr *) (packet + capinfo.link_hl);
#endif
// Get IP version
ip_ver = ip4->ip_v;
switch (ip_ver) {
case 4:
ip_hl = ip4->ip_hl * 4;
ip_proto = ip4->ip_p;
ip_off = ntohs(ip4->ip_off);
ip_frag = ip_off & (IP_MF | IP_OFFMASK);
ip_frag_off = (ip_frag) ? (ip_off & IP_OFFMASK) * 8 : 0;
// TODO Get fragment information
inet_ntop(AF_INET, &ip4->ip_src, ip_src, sizeof(ip_src));
inet_ntop(AF_INET, &ip4->ip_dst, ip_dst, sizeof(ip_dst));
break;
#ifdef WITH_IPV6
case 6:
ip_hl = sizeof(struct ip6_hdr);
ip_proto = ip6->ip6_nxt;
if (ip_proto == IPPROTO_FRAGMENT) {
struct ip6_frag *ip6f = (struct ip6_frag *) (ip6 + ip_hl);
ip_frag_off = ntohs(ip6f->ip6f_offlg & IP6F_OFF_MASK);
// TODO Get fragment information
}
inet_ntop(AF_INET6, &ip6->ip6_src, ip_src, sizeof(ip_src));
inet_ntop(AF_INET6, &ip6->ip6_dst, ip_dst, sizeof(ip_dst));
break;
#endif
default:
return;
}
// Only interested in UDP packets
if (ip_proto == IPPROTO_UDP) {
// Get UDP header
udp = (struct udphdr *)((u_char *)(ip4) + ip_hl);
udp_off = (ip_frag_off) ? 0 : sizeof(struct udphdr);
// Set packet ports
sport = htons(udp->uh_sport);
dport = htons(udp->uh_dport);
// Get actual payload size
size_payload -= capinfo.link_hl + ip_hl + udp_off;
#ifdef WITH_IPV6
if (ip_ver == 6)
size_payload -= ntohs(ip6->ip6_ctlun.ip6_un1.ip6_un1_plen);
#endif
// Get payload start
payload = (u_char *) (udp) + udp_off;
// Set transport UDP
transport = CAPTURE_PACKET_SIP_UDP;
} else if (ip_proto == IPPROTO_TCP) {
// Get TCP header
tcp = (struct tcphdr *)((u_char *)(ip4 )+ ip_hl);
tcp_off = (ip_frag_off) ? 0 : (tcp->th_off * 4);
// Set packet ports
sport = htons(tcp->th_sport);
dport = htons(tcp->th_dport);
// Get actual payload size
size_payload -= capinfo.link_hl + ip_hl + tcp_off;
#ifdef WITH_IPV6
if (ip_ver == 6)
size_payload -= ntohs(ip6->ip6_ctlun.ip6_un1.ip6_un1_plen);
#endif
// Get payload start
payload = (u_char *)(tcp) + tcp_off;
// Set transport TCP
transport = CAPTURE_PACKET_SIP_TCP;
} else {
// Not handled protocol
return;
}
if ((int32_t)size_payload < 0)
size_payload = 0;
// Create a structure for this captured packet
pkt = capture_packet_create(header, packet, header->caplen);
capture_packet_set_type(pkt, transport);
// For TCP and UDP, use payload directly from the packet
capture_packet_set_payload(pkt, NULL, size_payload);
#ifdef WITH_OPENSSL
// Check if packet is TLS
if (capinfo.keyfile && transport == CAPTURE_PACKET_SIP_TCP)
tls_process_segment(ip4, pkt);
#endif
// Check if packet is WS or WSS
if (transport == CAPTURE_PACKET_SIP_TCP)
capture_ws_check_packet(pkt);
// We're only interested in packets with payload
if (capture_packet_get_payload_len(pkt)) {
// Parse this header and payload
if (sip_load_message(pkt, ip_src, sport, ip_dst, dport)) {
// Store this packets in output file
dump_packet(capinfo.pd, header, packet);
return;
}
// Check if this packet belongs to a RTP stream
// TODO Store this packet in the stream
if ((stream = rtp_check_stream(pkt, ip_src, sport, ip_dst, dport))) {
// We have an RTP packet!
capture_packet_set_type(pkt, CAPTURE_PACKET_RTP);
// Store this pacekt if capture rtp is enabled
if (capinfo.rtp_capture) {
call_add_rtp_packet(stream_get_call(stream), pkt);
} else {
capture_packet_destroy(pkt);
}
// Store this packets in output file
dump_packet(capinfo.pd, header, packet);
return;
}
}
// Not an interesting packet ...
capture_packet_destroy(pkt);
}
void
parse_packet(u_char *mode, const struct pcap_pkthdr *header, const u_char *packet)
{
// Datalink Header size
int size_link;
// IP version
uint32_t ip_ver;
// IP header data
struct ip *ip4;
#ifdef WITH_IPV6
// IPv6 header data
struct ip6_hdr *ip6;
#endif
// IP protocol
uint8_t ip_proto;
// IP segment length
uint32_t ip_len;
// IP header size
uint32_t size_ip;
// Fragment offset
uint16_t ip_off = 0;
// Fragmentation flag
uint8_t ip_frag = 0;
// Fragmentation offset
uint16_t ip_frag_off = 0;
//! Source Address
char ip_src[INET6_ADDRSTRLEN + 1];
//! Destination Address
char ip_dst[INET6_ADDRSTRLEN + 1];
// UDP header data
struct udphdr *udp;
// UDP header size
uint16_t udp_size;
// TCP header data
struct tcphdr *tcp;
// TCP header size
uint16_t tcp_size;
// Packet payload data
u_char *msg_payload = NULL;
// Packet payload size
uint32_t size_payload;
// Parsed message data
sip_msg_t *msg;
// Total packet size
uint32_t size_packet;
// SIP message transport
int transport; /* 0 UDP, 1 TCP, 2 TLS */
// Source and Destination Ports
u_short sport, dport;
// Ignore packets while capture is paused
if (capture_is_paused())
return;
// Check if we have reached capture limit
if (capinfo.limit && sip_calls_count() >= capinfo.limit)
return;
// Get link header size from datalink type
size_link = datalink_size(capinfo.link);
// Get IP header
ip4 = (struct ip*) (packet + size_link);
#ifdef WITH_IPV6
// Get IPv6 header
ip6 = (struct ip6_hdr*)(packet + size_link);
#endif
// Get IP version
ip_ver = ip4->ip_v;
switch(ip_ver) {
case 4:
size_ip = ip4->ip_hl * 4;
ip_proto = ip4->ip_p;
ip_len = ntohs(ip4->ip_len);
inet_ntop(AF_INET, &ip4->ip_src, ip_src, sizeof(ip_src));
inet_ntop(AF_INET, &ip4->ip_dst, ip_dst, sizeof(ip_dst));
ip_off = ntohs(ip4->ip_off);
ip_frag = ip_off & (IP_MF | IP_OFFMASK);
ip_frag_off = (ip_frag) ? (ip_off & IP_OFFMASK) * 8 : 0;
break;
#ifdef WITH_IPV6
case 6:
size_ip = sizeof(struct ip6_hdr);
ip_proto = ip6->ip6_nxt;
ip_len = ntohs(ip6->ip6_plen);
inet_ntop(AF_INET6, &ip6->ip6_src, ip_src, INET6_ADDRSTRLEN);
inet_ntop(AF_INET6, &ip6->ip6_dst, ip_dst, INET6_ADDRSTRLEN);
if (ip_proto == IPPROTO_FRAGMENT) {
struct ip6_frag *ip6f = (struct ip6_frag *) (ip6 + ip_len);
ip_frag_off = ntohs(ip6f->ip6f_offlg & IP6F_OFF_MASK);
}
break;
#endif
default:
return;
}
// Only interested in UDP packets
if (ip_proto == IPPROTO_UDP) {
// Set transport UDP
transport = 0;
// Get UDP header
udp = (struct udphdr*) (packet + size_link + size_ip);
udp_size = (ip_frag_off) ? 0 : sizeof(struct udphdr);
// Set packet ports
sport = udp->uh_sport;
dport = udp->uh_dport;
size_payload = htons(udp->uh_ulen) - udp_size;
if ((int32_t)size_payload > 0 ) {
// Get packet payload
msg_payload = malloc(size_payload + 1);
memset(msg_payload, 0, size_payload + 1);
memcpy(msg_payload, (u_char *) (packet + size_link + size_ip + udp_size), size_payload);
}
// Total packet size
size_packet = size_link + size_ip + udp_size + size_payload;
} else if (ip_proto == IPPROTO_TCP) {
// Set transport TCP
transport = 1;
tcp = (struct tcphdr*) (packet + size_link + size_ip);
tcp_size = (ip_frag_off) ? 0 : (tcp->th_off * 4);
// Set packet ports
sport = tcp->th_sport;
dport = tcp->th_dport;
// We're only interested in packets with payload
size_payload = ip_len - (size_ip + tcp_size);
if ((int32_t)size_payload > 0) {
// Get packet payload
msg_payload = malloc(size_payload + 1);
memset(msg_payload, 0, size_payload + 1);
memcpy(msg_payload, (u_char *) (packet + size_link + size_ip + tcp_size), size_payload);
}
// Total packet size
size_packet = size_link + size_ip + tcp_size + size_payload;
#ifdef WITH_OPENSSL
if (!msg_payload || !strstr((const char*) msg_payload, "SIP/2.0")) {
if (capture_get_keyfile()) {
// Allocate memory for the payload
msg_payload = malloc(size_payload + 1);
memset(msg_payload, 0, size_payload + 1);
// Try to decrypt the packet
tls_process_segment(ip4, &msg_payload, &size_payload);
// Check if we have decoded payload
if (size_payload <= 0)
free(msg_payload);
// Set Transport TLS
transport = 2;
}
}
#endif
} else {
// Not handled protocol
return;
}
// Increase capture stats
if (ip4->ip_v == 4 && capinfo.devices) {
if(is_local_address(ip4->ip_src.s_addr)) {
capinfo.local_ports[htons(sport)]++;
capinfo.remote_ports[htons(dport)]++;
} else {
capinfo.remote_ports[htons(sport)]++;
capinfo.local_ports[htons(dport)]++;
}
}
// We're only interested in packets with payload
if (size_payload <= 0)
return;
// Parse this header and payload
msg = sip_load_message(header, ip_src, sport, ip_dst, dport, msg_payload);
free(msg_payload);
// This is not a sip message, Bye!
if (!msg)
return;
// Store Transport attribute
if (transport == 0) {
msg_set_attribute(msg, SIP_ATTR_TRANSPORT, "UDP");
} else if (transport == 1) {
msg_set_attribute(msg, SIP_ATTR_TRANSPORT, "TCP");
} else if (transport == 2) {
msg_set_attribute(msg, SIP_ATTR_TRANSPORT, "TLS");
}
// Set message PCAP data
msg->pcap_packet = malloc(size_packet);
memcpy(msg->pcap_packet, packet, size_packet);
// Store this packets in output file
dump_packet(capinfo.pd, header, packet);
}
