312 lines
7.6 KiB
C
312 lines
7.6 KiB
C
#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#ifdef _WIN32
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#include <winsock2.h>
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#include <ws2tcpip.h>
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#include <windows.h>
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#else
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#include <unistd.h>
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#endif
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#include <pcap.h>
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#include "pcap/funcattrs.h"
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static int ifprint(pcap_if_t *d);
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static char *iptos(bpf_u_int32 in);
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#ifdef _WIN32
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#include "portability.h"
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/*
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* Generate a string for a Win32-specific error (i.e. an error generated when
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* calling a Win32 API).
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* For errors occurred during standard C calls, we still use pcap_strerror()
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*/
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#define ERRBUF_SIZE 1024
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static const char *
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win32_strerror(DWORD error)
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{
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static char errbuf[ERRBUF_SIZE+1];
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size_t errlen;
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FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, NULL, error, 0, errbuf,
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ERRBUF_SIZE, NULL);
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/*
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* "FormatMessage()" "helpfully" sticks CR/LF at the end of the
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* message. Get rid of it.
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*/
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errlen = strlen(errbuf);
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if (errlen >= 2) {
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errbuf[errlen - 1] = '\0';
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errbuf[errlen - 2] = '\0';
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errlen -= 2;
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}
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return errbuf;
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}
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static char *
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getpass(const char *prompt)
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{
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HANDLE console_handle = GetStdHandle(STD_INPUT_HANDLE);
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DWORD console_mode, save_console_mode;
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static char password[128+1];
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char *p;
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fprintf(stderr, "%s", prompt);
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/*
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* Turn off echoing.
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*/
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if (!GetConsoleMode(console_handle, &console_mode)) {
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fprintf(stderr, "Can't get console mode: %s\n",
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win32_strerror(GetLastError()));
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exit(1);
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}
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save_console_mode = console_mode;
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console_mode &= ~ENABLE_ECHO_INPUT;
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if (!SetConsoleMode(console_handle, console_mode)) {
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fprintf(stderr, "Can't set console mode: %s\n",
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win32_strerror(GetLastError()));
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exit(1);
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}
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if (fgets(password, sizeof password, stdin) == NULL) {
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fprintf(stderr, "\n");
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SetConsoleMode(console_handle, save_console_mode);
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exit(1);
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}
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fprintf(stderr, "\n");
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SetConsoleMode(console_handle, save_console_mode);
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p = strchr(password, '\n');
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if (p != NULL)
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*p = '\0';
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return password;
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}
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#endif
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int main(int argc, char **argv)
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{
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pcap_if_t *alldevs;
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pcap_if_t *d;
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bpf_u_int32 net, mask;
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int exit_status = 0;
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char errbuf[PCAP_ERRBUF_SIZE+1];
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#ifdef ENABLE_REMOTE
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struct pcap_rmtauth auth;
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char username[128+1];
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char *p;
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char *password;
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#endif
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#ifdef ENABLE_REMOTE
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if (argc >= 2)
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{
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if (pcap_findalldevs_ex(argv[1], NULL, &alldevs, errbuf) == -1)
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{
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/*
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* OK, try it with a user name and password.
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*/
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fprintf(stderr, "User name: ");
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if (fgets(username, sizeof username, stdin) == NULL)
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exit(1);
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p = strchr(username, '\n');
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if (p != NULL)
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*p = '\0';
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password = getpass("Password: ");
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auth.type = RPCAP_RMTAUTH_PWD;
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auth.username = username;
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auth.password = password;
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if (pcap_findalldevs_ex(argv[1], &auth, &alldevs, errbuf) == -1)
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{
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fprintf(stderr,"Error in pcap_findalldevs: %s\n",errbuf);
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exit(1);
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}
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}
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}
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else
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#endif
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{
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if (pcap_findalldevs(&alldevs, errbuf) == -1)
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{
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fprintf(stderr,"Error in pcap_findalldevs: %s\n",errbuf);
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exit(1);
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}
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}
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for(d=alldevs;d;d=d->next)
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{
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if (!ifprint(d))
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exit_status = 2;
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}
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if (alldevs != NULL)
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{
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if (pcap_lookupnet(alldevs->name, &net, &mask, errbuf) < 0)
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{
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fprintf(stderr,"Error in pcap_lookupnet: %s\n",errbuf);
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exit_status = 2;
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}
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else
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{
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printf("Preferred device is on network: %s/%s\n",iptos(net), iptos(mask));
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}
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}
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pcap_freealldevs(alldevs);
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exit(exit_status);
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}
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static int ifprint(pcap_if_t *d)
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{
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pcap_addr_t *a;
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char ipv4_buf[INET_ADDRSTRLEN];
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char ipv6_buf[INET6_ADDRSTRLEN];
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const char *sep;
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int status = 1; /* success */
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printf("%s\n",d->name);
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if (d->description)
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printf("\tDescription: %s\n",d->description);
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printf("\tFlags: ");
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sep = "";
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if (d->flags & PCAP_IF_UP) {
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printf("%sUP", sep);
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sep = ", ";
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}
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if (d->flags & PCAP_IF_RUNNING) {
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printf("%sRUNNING", sep);
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sep = ", ";
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}
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if (d->flags & PCAP_IF_LOOPBACK) {
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printf("%sLOOPBACK", sep);
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sep = ", ";
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}
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if (d->flags & PCAP_IF_WIRELESS) {
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printf("%sWIRELESS", sep);
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switch (d->flags & PCAP_IF_CONNECTION_STATUS) {
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case PCAP_IF_CONNECTION_STATUS_UNKNOWN:
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printf(" (association status unknown)");
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break;
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case PCAP_IF_CONNECTION_STATUS_CONNECTED:
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printf(" (associated)");
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break;
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case PCAP_IF_CONNECTION_STATUS_DISCONNECTED:
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printf(" (not associated)");
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break;
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case PCAP_IF_CONNECTION_STATUS_NOT_APPLICABLE:
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break;
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}
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} else {
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switch (d->flags & PCAP_IF_CONNECTION_STATUS) {
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case PCAP_IF_CONNECTION_STATUS_UNKNOWN:
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printf(" (connection status unknown)");
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break;
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case PCAP_IF_CONNECTION_STATUS_CONNECTED:
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printf(" (connected)");
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break;
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case PCAP_IF_CONNECTION_STATUS_DISCONNECTED:
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printf(" (disconnected)");
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break;
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case PCAP_IF_CONNECTION_STATUS_NOT_APPLICABLE:
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break;
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}
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}
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sep = ", ";
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printf("\n");
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for(a=d->addresses;a;a=a->next) {
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if (a->addr != NULL)
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switch(a->addr->sa_family) {
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case AF_INET:
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printf("\tAddress Family: AF_INET\n");
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if (a->addr)
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printf("\t\tAddress: %s\n",
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inet_ntop(AF_INET,
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&((struct sockaddr_in *)(a->addr))->sin_addr,
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ipv4_buf, sizeof ipv4_buf));
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if (a->netmask)
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printf("\t\tNetmask: %s\n",
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inet_ntop(AF_INET,
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&((struct sockaddr_in *)(a->netmask))->sin_addr,
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ipv4_buf, sizeof ipv4_buf));
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if (a->broadaddr)
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printf("\t\tBroadcast Address: %s\n",
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inet_ntop(AF_INET,
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&((struct sockaddr_in *)(a->broadaddr))->sin_addr,
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ipv4_buf, sizeof ipv4_buf));
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if (a->dstaddr)
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printf("\t\tDestination Address: %s\n",
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inet_ntop(AF_INET,
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&((struct sockaddr_in *)(a->dstaddr))->sin_addr,
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ipv4_buf, sizeof ipv4_buf));
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break;
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#ifdef INET6
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case AF_INET6:
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printf("\tAddress Family: AF_INET6\n");
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if (a->addr)
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printf("\t\tAddress: %s\n",
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inet_ntop(AF_INET6,
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((struct sockaddr_in6 *)(a->addr))->sin6_addr.s6_addr,
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ipv6_buf, sizeof ipv6_buf));
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if (a->netmask)
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printf("\t\tNetmask: %s\n",
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inet_ntop(AF_INET6,
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((struct sockaddr_in6 *)(a->netmask))->sin6_addr.s6_addr,
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ipv6_buf, sizeof ipv6_buf));
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if (a->broadaddr)
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printf("\t\tBroadcast Address: %s\n",
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inet_ntop(AF_INET6,
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((struct sockaddr_in6 *)(a->broadaddr))->sin6_addr.s6_addr,
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ipv6_buf, sizeof ipv6_buf));
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if (a->dstaddr)
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printf("\t\tDestination Address: %s\n",
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inet_ntop(AF_INET6,
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((struct sockaddr_in6 *)(a->dstaddr))->sin6_addr.s6_addr,
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ipv6_buf, sizeof ipv6_buf));
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break;
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#endif
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default:
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printf("\tAddress Family: Unknown (%d)\n", a->addr->sa_family);
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break;
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}
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else
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{
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fprintf(stderr, "\tWarning: a->addr is NULL, skipping this address.\n");
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status = 0;
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}
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}
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printf("\n");
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return status;
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}
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/* From tcptraceroute */
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#define IPTOSBUFFERS 12
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static char *iptos(bpf_u_int32 in)
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{
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static char output[IPTOSBUFFERS][3*4+3+1];
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static short which;
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u_char *p;
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p = (u_char *)∈
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which = (which + 1 == IPTOSBUFFERS ? 0 : which + 1);
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sprintf(output[which], "%d.%d.%d.%d", p[0], p[1], p[2], p[3]);
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return output[which];
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}
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