C++ pcap_freealldevs函数代码示例

/*
 * 初始化缓存区，生成接口句柄
 * skfd: 被初始化的接口句柄
 * @return: 0: 成功
 *          -1: 初始化接口句柄失败
 */
static int eapol_init(pcap_t **skfd)
{
    pcap_if_t *alldevs, *d;
    char errbuf[PCAP_ERRBUF_SIZE];
    char ifbuff[8+IFNAMSIZ] = "rpcap://";

    sendethii = (ethII_t*)sendbuff;
    sendeapol = (eapol_t*)((uchar*)sendethii+sizeof(ethII_t));
    sendeap = (eap_t*)((uchar*)sendeapol+sizeof(eapol_t));
    sendeapbody = (eapbody_t*)((uchar*)sendeap+sizeof(eap_t));

    if (-1 == pcap_findalldevs(&alldevs, errbuf)) {
        _M("Get interface: %s\n", errbuf);
        return -1;
    }

    for (d = alldevs; NULL != d; d = d->next)
        if (0 == strcmp(ifname, d->name))
            break;
    if (NULL == d) return -1;
    /* 获取mac */
    LPADAPTER lpAdapter = PacketOpenAdapter(d->name);
    if (!lpAdapter || (lpAdapter->hFile == INVALID_HANDLE_VALUE))
        return -1;

    PPACKET_OID_DATA oidData = malloc(ETH_ALEN + sizeof(PACKET_OID_DATA));
    if (NULL == oidData) {
        PacketCloseAdapter(lpAdapter);
        return -1;
    }
    oidData->Oid = OID_802_3_CURRENT_ADDRESS;
    oidData->Length = ETH_ALEN;
    memset(oidData->Data, 0, ETH_ALEN);
    if (0 == PacketRequest(lpAdapter, FALSE, oidData)) {
        free(oidData);
        return -1;
    }
    memcpy(client_mac, oidData->Data, ETH_ALEN);
    PacketCloseAdapter(lpAdapter);
    _D("%s's MAC: %02X-%02X-%02X-%02X-%02X-%02X\n", ifname,
            client_mac[0],client_mac[1],client_mac[2],
            client_mac[3],client_mac[4],client_mac[5]);

    /* 获取网络接口句柄 */
    strncat(ifbuff, ifname, IFNAMSIZ);
    if (NULL == (*skfd = pcap_open(d->name, MTU_MAX,
                    PCAP_OPENFLAG_PROMISCUOUS, TIMEOUT*1000, NULL, errbuf))) {
        _M("Get interface handler:%s\n", errbuf);
        pcap_freealldevs(alldevs);
        return -1;
    }
    pcap_freealldevs(alldevs);

    return 0;
}

/** Get the index of an adapter by its network address
 *
 * @param netaddr network address of the adapter (e.g. 192.168.1.0)
 * @return index of the adapter or negative on error
 */
static int
get_adapter_index_from_addr(struct in_addr *netaddr, char *guid, size_t guid_len)
{
   pcap_if_t *alldevs;
   pcap_if_t *d;
   char errbuf[PCAP_ERRBUF_SIZE+1];
   int index = 0;

   memset(guid, 0, guid_len);

   /* Retrieve the interfaces list */
   if (pcap_findalldevs_ex(PCAP_SRC_IF_STRING, NULL, &alldevs, errbuf) == -1) {
      printf("Error in pcap_findalldevs: %s\n", errbuf);
      return -1;
   }
   /* Scan the list printing every entry */
   for (d = alldevs; d != NULL; d = d->next, index++) {
      pcap_addr_t *a;
      for(a = d->addresses; a != NULL; a = a->next) {
         if (a->addr->sa_family == AF_INET) {
            ULONG a_addr = ((struct sockaddr_in *)a->addr)->sin_addr.s_addr;
            ULONG a_netmask = ((struct sockaddr_in *)a->netmask)->sin_addr.s_addr;
            ULONG a_netaddr = a_addr & a_netmask;
            ULONG addr = (*netaddr).s_addr;
            if (a_netaddr == addr) {
               int ret = -1;
               char name[128];
               char *start, *end;
               size_t len = strlen(d->name);
               if(len > 127) {
                  len = 127;
               }
               memcpy(name, d->name, len);
               name[len] = 0;
               start = strstr(name, "{");
               if (start != NULL) {
                  end = strstr(start, "}");
                  if (end != NULL) {
                     size_t len = end - start + 1;
                     memcpy(guid, start, len);
                     ret = index;
                  }
               }
               pcap_freealldevs(alldevs);
               return ret;
            }
         }
      }
   }
   printf("Network address not found.\n");

   pcap_freealldevs(alldevs);
   return -1;
}

int main(void)
{
	pcap_if_t *iface, *devs;
	int j, i;
	char errbuf[PCAP_ERRBUF_SIZE + 1];
	FILE *fp;

	printf("Copyright (C) Ahmed Samy 2014 <[email protected]>\n\n");
	printf("\t\t\tNetwork Traffic Analyzer\n");

	if (pcap_findalldevs(&devs, errbuf) == -1 || !devs) {
		fprintf(stderr, "No network devices are currently connected\n");
		return 1;
	}

	printf("Enabled Network Devices:\n");
	for (i = 1, iface = devs; iface; iface = iface->next)
		printf("%d - %s\n", i++, iface->description);

prompt:
	printf("Device Index> ");
	scanf("%d", &j);

	/* Find the interface pointer.  */
	for (i = 1, iface = devs; iface && i != j; iface = iface->next, ++i);
	if (!iface) {
		fprintf(stderr, "Invalid device index %d, please try again.", j);
		goto prompt;
	}

	c = capture_new();
	c->capture_fn = print_data;

	if (!capture_set_iface(c, iface)) {
		fprintf(stderr, "Internal error: could not set the interface to capture!\n");
		pcap_freealldevs(devs);
		return 1;
	}
	pcap_freealldevs(devs);

	fp = fopen("last_bandwidth.txt", "r");
	if (fp) {
		fscanf(fp, "%lf", &c->cur_bw);
		fclose(fp);
	}

	signal(SIGINT, handle_sig);
	signal(SIGABRT, handle_sig);
	signal(SIGTERM, handle_sig);

	capture_start(c);
	return 0;
}

void pcaplistener::setFilter()
{
    int res;
    struct tm * ltime;
    char timestr[16];
    struct pcap_pkthdr *header;
    const u_char *pkt_data;
    time_t local_tv_sec;

    if(pcap_compile(pcap, &filter, fexpr.c_str(), 1, mask) < 0)
    {
        fprintf(stderr,"\nUnable to compile the packet filter. Check the syntax.\n");
        /* Free the device list */
        pcap_freealldevs(allDevs);
        exit(0);
    }

    if(pcap_setfilter(pcap, &filter) < 0)
    {
        fprintf(stderr,"\nError setting the filter.\n");
        /* Free the device list */
        pcap_freealldevs(allDevs);
        exit(0);
    }

    printf("Filter is set for %s\n", fexpr.c_str());
    printf("Filtering for packets...\n");

    /* Retrieve the packets */
    /* Using pcap_next_ex() instead of pcap_loop() */
    while((res = pcap_next_ex(pcap, &header, &pkt_data)) >= 0)
    {
        if(res == 0)
            /* Timeout elapsed */
            continue;

        /* convert the timestamp to readable format */
        local_tv_sec = header->ts.tv_sec;
        ltime = localtime(&local_tv_sec);
        strftime( timestr, sizeof timestr, "%H:%M:%S", ltime);

        printf("%s,%.6d len:%d\n", timestr, header->ts.tv_usec, header->len);
    }

    if(res == -1) {
        printf("Error reading the packets: %s\n", pcap_geterr(pcap));
        exit(0);
    }

    return;
}

int net_interface_imp::set_capture_ether_type(uint16_t * ether_type, uint32_t count)
{
    struct bpf_program fcode;
    char ether_type_string[512];
    char ether_type_single[64];
    const unsigned char * ether_packet = NULL;
    struct pcap_pkthdr pcap_header;

    ether_type_string[0] = 0;

    for (uint32_t index_i = 0; index_i < count; index_i++)
    {
        sprintf(ether_type_single, "ether proto 0x%04x", ether_type[index_i]);
        strcat(ether_type_string, ether_type_single);

        if ((index_i + 1) < count)
        {
            strcat(ether_type_string, " or ");
        }
    }

    /******************************************************* Compile a filter ************************************************/
    if (pcap_compile(pcap_interface, &fcode, ether_type_string, 1, 0) < 0)
    {
        log_imp_ref->post_log_msg(LOGGING_LEVEL_ERROR, "Unable to compile the packet filter.");
        pcap_freealldevs(all_devs); // Free the device list
        return -1;
    }

    /*************************************************** Set the filter *******************************************/
    if (pcap_setfilter(pcap_interface, &fcode) < 0)
    {
        log_imp_ref->post_log_msg(LOGGING_LEVEL_ERROR, "Error setting the filter.");
        pcap_freealldevs(all_devs); // Free the device list
        return -1;
    }

    /*********** Flush any packets that might be present **********/
    for (uint32_t index_j = 0; index_j < 1; index_j++)
    {
        ether_packet = pcap_next(pcap_interface, &pcap_header);
        if (!ether_packet)
        {
            break;
        }
    }

    return 0;
}

inline std::vector<std::string> find_all_devices() {
  pcap_if_t *all_devices = nullptr;
  auto buf = error_buffer{};
  const auto result = pcap_findalldevs(&all_devices, buf.data());
  if (result != 0) {
    pcap_freealldevs(all_devices);
    throw error{"pcap_findalldevs error\n" + error_string(buf)};
  }
  std::vector<std::string> devices;
  for (auto device = all_devices; device != nullptr; device = device->next) {
    devices.emplace_back(device->name);
  }
  pcap_freealldevs(all_devices);
  return devices;
}

int GetAdapterName(int AdapterNumber, char* AdapterName, int AdapterNameSize)
{
int i;
pcap_if_t *alldevs;
pcap_if_t *device;
char errbuf[PCAP_ERRBUF_SIZE + 1] = "";

	if (pcap_findalldevs(&alldevs, errbuf) == -1)
	{
		printf("Error when getting the list of the installed adapters%s\n", errbuf );
		return nbFAILURE;
	}

	// Get interface name
	i= 1;
	for (device=alldevs; device != NULL; device=device->next)
	{
		if (i == AdapterNumber)
		{
			strncpy(AdapterName, device->name, AdapterNameSize);
			AdapterName[AdapterNameSize-1]= 0;

			// Free the device list
			pcap_freealldevs(alldevs);
			return nbSUCCESS;
		}

		i++;
	}

	return nbFAILURE;
}

/* This function blatantly ripped from 
http://www.winpcap.org/docs/docs31/html/group__wpcap__tut1.html */
void list_devices (void)
{
    pcap_if_t *alldevs;
    pcap_if_t *d;
    int i=0;
    char errbuf[PCAP_ERRBUF_SIZE];
    
    /* Retrieve the device list from the local machine */
    if (pcap_findalldevs_ex(PCAP_SRC_IF_STRING, NULL /* auth is not needed */, &alldevs, errbuf) == -1)
    {
        fprintf(stderr,"Error in pcap_findalldevs_ex: %s\n", errbuf);
        exit(1);
    }
    
    /* Print the list */
    for(d= alldevs; d != NULL; d= d->next)
    {
        printf("%d. %s", ++i, d->name);
        if (d->description)
            printf(" (%s)\n", d->description);
        else
            printf(" (No description available)\n");
    }
    
    if (i == 0)
    {
        printf("\nNo interfaces found! Make sure WinPcap is installed.\n");
        return;
    }

    /* We don't need any more the device list. Free it */
    pcap_freealldevs(alldevs);
}

int main(int argc, char *argv[])
{
	struct interface_list *itfc_list;
	char iface[100];

	pd = NULL;

	gui_register_exit(&exit_fun);
	gui_register_stop(&stop_fun);

	itfc_list = get_interface_list();
	gui_set_interface_list(itfc_list);

	guipid = gui_pthread_start(&argc, &argv);

	cappid = pthread_self();

	signal(SIGUSR1, idle_sig);
	while (gui_wait_capture(iface) == 0) {
		start_capture(iface);
	}

	printf("exit\n");
	pcap_freealldevs(if_list);
	return 0;
}

char *
pcap_ex_name(char *name)
{
#ifdef _WIN32
	/*
	 * XXX - translate from libdnet logical interface name to
	 * WinPcap native interface name.
	 */
	static char pcap_name[256];
        pcap_if_t *pifs, *pif;
	char ebuf[128];
	int idx, i = 0;

	/* XXX - according to the WinPcap FAQ, no loopback support??? */
        if (strncmp(name, "eth", 3) != 0 || sscanf(name+3, "%u", &idx) != 1 ||
	    _pcap_ex_findalldevs(&pifs, ebuf) == -1) {
		return (name);
	}
	for (pif = pifs; pif != NULL; pif = pif->next) {
		if (i++ == idx) {
			strncpy(pcap_name, pif->name, sizeof(pcap_name)-1);
			pcap_name[sizeof(pcap_name)-1] = '\0';
			name = pcap_name;
			break;
		}
	}
	pcap_freealldevs(pifs);
	return (name);
#else
	return (name);
#endif
}

struct if_nameindex * pcap_nameindex (void)

{

#if defined (WINPCAP) || defined (LIBPCAP)

	char buffer [PCAP_ERRBUF_SIZE];
	pcap_if_t * devices = (pcap_if_t *)(0);
	pcap_if_t * device;
	if (pcap_findalldevs (&devices, buffer) != -1)
	{
		struct if_nameindex * ifs;
		struct if_nameindex * ifp;
		unsigned count = 1;
		for (device = devices; device; device = device->next)
		{
			count++;
		}
		ifp = ifs = (struct if_nameindex *)(malloc (count * sizeof (struct if_nameindex)));
		if (ifs) for (device = devices; device; device = device->next)
		{
			ifp->if_index = device->index;
			ifp->if_name = strdup (device->name);
			ifp++;
		}
		memset (ifp, 0, sizeof (* ifp));
		pcap_freealldevs (devices);
		return (ifs);
	}

#endif

	return ((struct if_nameindex *)(0));
}

void Call_Device(char **C_dev)
{
    pcap_if_t *alldevs;
    pcap_if_t *d;
    int i=0;
    char Select_device[10];
    char errbuf[PCAP_ERRBUF_SIZE];


    /* Retrieve the device list */
    if (pcap_findalldevs(&alldevs, errbuf) == -1)
        fprintf(stderr,"Error in pcap_findalldevs: %s\n", errbuf);
    /* Print the list */
    for(d=alldevs;d;d=d->next)
        printf("%d. %s \n", ++i, d->name);


    if(i==0)
        printf("\nNo interfaces found! Make sure WinPcap is installed.\n");

    printf("\nSelect Device: ");
    scanf("%s",&Select_device);


    *C_dev=Select_device;


    /* We don't need any more the device list. Free it */
    pcap_freealldevs(alldevs);
}

static char *match_dev_regex_or_die(const char *regstr) {
    static char dev[1024];
    int matches = 0, devlen = 0;
    char errbuf[PCAP_ERRBUF_SIZE];
    pcap_if_t *interfaces, *cur;
    int err;

    err = pcap_findalldevs(&interfaces, errbuf);
    if(err)
        die(0, "pcap_findalldevs(): %s", errbuf);

    for(cur = interfaces; cur; cur = cur->next)
        if(regex_matches_or_is_null(regstr, cur->name))
            devlen = snprintf(&dev[devlen], sizeof(dev) - devlen
                              , "%s%s"
                              , matches++ ? ", " : ""
                              , cur->name);

    if(!matches)
        die(0, "No device matching regex: %s", regstr);
    else if(matches > 1)
        die(0, "Ambiguous device regex: %s\nDid you mean one of these: %s", regstr, dev);

    pcap_freealldevs(interfaces);
    return dev;
}

/**
********************************************************************************
\brief  setup the process image

SetupProcessImage() sets up the process image used by the application.

\retval         -1              if interface list couldn't be filled
\retval         0               if interface list was successfully filled
*******************************************************************************/
int InterfaceSelectDialog::fillList(void)
{
    char                        sErr_Msg[PCAP_ERRBUF_SIZE];
    pcap_if_t *                 alldevs;
    pcap_if_t *                 seldev;
    int                         numIntf = 0;

    /* Retrieve the device list on the local machine */
    if (pcap_findalldevs(&alldevs, sErr_Msg) == -1)
    {
        return -1;
    }

    /* Add the list to the listbox */
    for (seldev = alldevs; seldev != NULL; seldev = seldev->next)
    {
        numIntf ++;
        new QListWidgetItem(seldev->name, m_deviceListWidget);
    }
    pcap_freealldevs(alldevs);

    if (numIntf > 0)
        return 0;
    else
        return -1;
}

/* Display Ethernet interfaces of the system */
int gen_eth_show_dev_list(void)
{
   char pcap_errbuf[PCAP_ERRBUF_SIZE];
   pcap_if_t *dev_list,*dev;
   int res;

   printf("Network device list:\n\n");

#ifndef CYGWIN
   res = pcap_findalldevs(&dev_list,pcap_errbuf);
#else
   res = pcap_findalldevs_ex(PCAP_SRC_IF_STRING,NULL,&dev_list,pcap_errbuf);
#endif

   if (res < 0) {
      fprintf(stderr,"PCAP: unable to find device list (%s)\n",pcap_errbuf);
      return(-1);
   }

   for(dev=dev_list;dev;dev=dev->next) {
      printf("   %s : %s\n",
             dev->name,
             dev->description ? dev->description : "no info provided");
   }

   printf("\n");

   pcap_freealldevs(dev_list);
   return(0);
}