void handle_tcp(const unsigned char *bytes, uint16_t segment_len) {
struct tcphdr *tcp_hdr = (struct tcphdr *) bytes;
tcp_hdr->th_sport = ntohs(tcp_hdr->th_sport);
tcp_hdr->th_dport = ntohs(tcp_hdr->th_dport);
printf2("TCP %u -> %u, [", tcp_hdr->th_sport, tcp_hdr->th_dport);
print_flags(tcp_hdr->th_flags);
print2("], ");
printf2("seq %u, ack %u, win %u\n", ntohl(tcp_hdr->seq), ntohl(tcp_hdr->ack_seq), ntohs(tcp_hdr->window));
int data_offset = 4 * tcp_hdr->th_off;
const unsigned char *end = bytes + data_offset;
bytes += sizeof(struct tcphdr);
while(bytes < end) {
uint8_t kind = *bytes++;
uint8_t len = 0;
if(kind != 0 && kind != 1)
len = *bytes++;
printf3(" option %u: ", kind);
switch(kind) {
case 0: print3("end of options"); break;
case 1: print3("no operation (NOP)"); break;
case 2: printf3("MSS %u", (*(uint32_t*) bytes)); break;
case 3: print3("window scale"); break;
case 4: print3("SACK permited"); break;
case 5: print3("SACK"); break;
case 8: print3("timestamps"); break;
default: print3("unknown"); break;
}
print3("\n");
// advance by the size of the option read
if(kind != 0 && kind != 1)
bytes += len - 2;
}
if(tcp_hdr->th_sport == 80 || tcp_hdr->th_dport == 80) {
handle_http((const char *) bytes);
}
else if(tcp_hdr->th_sport == 23 || tcp_hdr->th_dport == 23) {
handle_telnet(bytes, segment_len - data_offset);
}
else {
printf1("??? Unknown TCP application with ports %u -> %u\n", tcp_hdr->th_sport, tcp_hdr->th_dport);
}
}
static int
handle_user_char(console_info_t *info, unsigned char c)
{
int rv;
if (info->tn_pos)
c = handle_telnet(info, c);
if (!c)
return 0;
switch(c) {
case TN_IAC:
if (info->telnet) {
info->tn_buf[0] = c;
info->tn_pos = 1;
} else
goto handle_char;
break;
case 8:
case 0x7f:
if (info->pos > 0) {
info->pos--;
if (info->echo)
rv = write(info->outfd, "\b \b", 3);
}
break;
case 4:
if (info->pos == 0) {
if (info->echo)
rv = write(info->outfd, "\n", 1);
return 1;
}
break;
case 10:
case 13:
if (info->echo) {
rv = write(info->outfd, "\n", 1);
if (info->telnet)
rv = write(info->outfd, "\r", 1);
}
info->buffer[info->pos] = '\0';
if (strcmp(info->buffer, "noecho") == 0) {
info->echo = 0;
} else {
ipmi_emu_cmd(&info->out, info->data->emu, info->buffer);
}
rv = write(info->outfd, "> ", 2);
info->pos = 0;
break;
handle_char:
default:
if (info->pos >= sizeof(info->buffer)-1) {
char *msg = "\nCommand is too long, max of %d characters\n";
rv = write(info->outfd, msg, strlen(msg));
} else {
info->buffer[info->pos] = c;
info->pos++;
if (info->echo)
rv = write(info->outfd, &c, 1);
}
}
return 0;
}
