nicely separate conn2inode stuff into its own file
This commit is contained in:
Arnout Engelen
169
conninode.cpp
Normal file
169
conninode.cpp
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#include <netinet/in.h>
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#include <map>
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#
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#include "nethogs.h"
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#include "conninode.h"
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extern local_addr * local_addrs;
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/*
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* connection-inode table. takes information from /proc/net/tcp.
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* key contains source ip, source port, destination ip, destination
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* port in format: '1.2.3.4:5-1.2.3.4:5'
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*/
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std::map <std::string, unsigned long> conninode;
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/*
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* parses a /proc/net/tcp-line of the form:
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* sl local_address rem_address st tx_queue rx_queue tr tm->when retrnsmt uid timeout inode
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* 10: 020310AC:1770 9DD8A9C3:A525 01 00000000:00000000 00:00000000 00000000 0 0 2119 1 c0f4f0c0 206 40 10 3 -1
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* 11: 020310AC:0404 936B2ECF:0747 01 00000000:00000000 00:00000000 00000000 1000 0 2109 1 c0f4fc00 368 40 20 2 -1
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*
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* and of the form:
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* 2: 0000000000000000FFFF0000020310AC:0016 0000000000000000FFFF00009DD8A9C3:A526 01 00000000:00000000 02:000A7214 00000000 0 0 2525 2 c732eca0 201 40 1 2 -1
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*
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*/
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void addtoconninode (char * buffer)
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{
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short int sa_family;
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struct in6_addr result_addr_local;
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struct in6_addr result_addr_remote;
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char rem_addr[128], local_addr[128];
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int local_port, rem_port;
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struct in6_addr in6_local;
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struct in6_addr in6_remote;
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// this leaked memory
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//unsigned long * inode = (unsigned long *) malloc (sizeof(unsigned long));
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unsigned long inode;
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int matches = sscanf(buffer, "%*d: %64[0-9A-Fa-f]:%X %64[0-9A-Fa-f]:%X %*X %*X:%*X %*X:%*X %*X %*d %*d %ld %*512s\n",
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local_addr, &local_port, rem_addr, &rem_port, &inode);
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if (matches != 5) {
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fprintf(stderr,"Unexpected buffer: '%s'\n",buffer);
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exit(0);
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}
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if (inode == 0) {
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/* connection is in TIME_WAIT state. We rely on
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* the old data still in the table. */
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return;
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}
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if (strlen(local_addr) > 8)
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{
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/* this is an IPv6-style row */
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/* Demangle what the kernel gives us */
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sscanf(local_addr, "%08X%08X%08X%08X",
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&in6_local.s6_addr32[0], &in6_local.s6_addr32[1],
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&in6_local.s6_addr32[2], &in6_local.s6_addr32[3]);
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sscanf(rem_addr, "%08X%08X%08X%08X",
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&in6_remote.s6_addr32[0], &in6_remote.s6_addr32[1],
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&in6_remote.s6_addr32[2], &in6_remote.s6_addr32[3]);
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if ((in6_local.s6_addr32[0] == 0x0) && (in6_local.s6_addr32[1] == 0x0)
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&& (in6_local.s6_addr32[2] == 0xFFFF0000))
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{
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/* IPv4-compatible address */
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result_addr_local = *((struct in6_addr*) &(in6_local.s6_addr32[3]));
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result_addr_remote = *((struct in6_addr*) &(in6_remote.s6_addr32[3]));
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sa_family = AF_INET;
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} else {
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/* real IPv6 address */
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//inet_ntop(AF_INET6, &in6_local, addr6, sizeof(addr6));
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//INET6_getsock(addr6, (struct sockaddr *) &localaddr);
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//inet_ntop(AF_INET6, &in6_remote, addr6, sizeof(addr6));
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//INET6_getsock(addr6, (struct sockaddr *) &remaddr);
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//localaddr.sin6_family = AF_INET6;
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//remaddr.sin6_family = AF_INET6;
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result_addr_local = in6_local;
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result_addr_remote = in6_remote;
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sa_family = AF_INET6;
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}
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}
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else
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{
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/* this is an IPv4-style row */
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sscanf(local_addr, "%X", (unsigned int *) &result_addr_local);
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sscanf(rem_addr, "%X", (unsigned int *) &result_addr_remote);
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sa_family = AF_INET;
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}
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char * hashkey = (char *) malloc (HASHKEYSIZE * sizeof(char));
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char * local_string = (char*) malloc (50);
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char * remote_string = (char*) malloc (50);
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inet_ntop(sa_family, &result_addr_local, local_string, 49);
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inet_ntop(sa_family, &result_addr_remote, remote_string, 49);
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snprintf(hashkey, HASHKEYSIZE * sizeof(char), "%s:%d-%s:%d", local_string, local_port, remote_string, rem_port);
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free (local_string);
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//if (DEBUG)
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// fprintf (stderr, "Hashkey: %s\n", hashkey);
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//std::cout << "Adding to conninode\n" << std::endl;
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conninode[hashkey] = inode;
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/* workaround: sometimes, when a connection is actually from 172.16.3.1 to
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* 172.16.3.3, packages arrive from 195.169.216.157 to 172.16.3.3, where
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* 172.16.3.1 and 195.169.216.157 are the local addresses of different
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* interfaces */
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struct local_addr * current_local_addr = local_addrs;
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while (current_local_addr != NULL) {
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/* TODO maybe only add the ones with the same sa_family */
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snprintf(hashkey, HASHKEYSIZE * sizeof(char), "%s:%d-%s:%d", current_local_addr->string, local_port, remote_string, rem_port);
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conninode[hashkey] = inode;
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current_local_addr = current_local_addr->next;
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}
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free (hashkey);
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free (remote_string);
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}
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/* opens /proc/net/tcp[6] and adds its contents line by line */
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int addprocinfo (const char * filename) {
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FILE * procinfo = fopen (filename, "r");
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char buffer[8192];
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if (procinfo == NULL)
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return 0;
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fgets(buffer, sizeof(buffer), procinfo);
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do
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{
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if (fgets(buffer, sizeof(buffer), procinfo))
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addtoconninode(buffer);
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} while (!feof(procinfo));
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fclose(procinfo);
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return 1;
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}
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void refreshconninode ()
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{
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/* we don't forget old mappings, just overwrite */
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//delete conninode;
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//conninode = new HashTable (256);
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if (! addprocinfo ("/proc/net/tcp"))
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{
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std::cout << "Error: couldn't open /proc/net/tcp\n";
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exit(0);
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}
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addprocinfo ("/proc/net/tcp6");
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//if (DEBUG)
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// reviewUnknown();
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}
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