局域网设备主动发现常用方法 - ToB企服应用市场:ToB评测及商务社交产业平台

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <netinet/if_ether.h>
#include <netinet/ip.h>
#include <netinet/arp.h>
#include <arpa/inet.h>
#include <net/if.h>
#include <ifaddrs.h>
#define BROADCAST_MAC "\xff\xff\xff\xff\xff\xff"
void send_arp_request(int sockfd, struct ether_header *eh, struct arphdr *arp, char *mac, char *ip, char *target_ip) {
memset(arp, 0, sizeof(struct arphdr));
arp->ar_hrd = htons(ARPHRD_ETHER); /* Ethernet */
arp->ar_pro = htons(ETH_P_IP); /* IP Protocol */
arp->ar_op = htons(AROP_REQUEST); /* ARP Request */
memcpy(arp->ar_saddr, mac, ETH_ALEN); /* Sender hardware address */
memcpy(arp->ar_sha, mac, ETH_ALEN); /* Sender hardware address */
memcpy(arp->ar_tpa, inet_aton(target_ip), 4); /* Target protocol address */
memcpy(arp->ar_tha, "\x00\x00\x00\x00\x00\x00", 6); /* Target hardware address (all zeros) */
memcpy(arp->ar_spa, inet_aton(ip), 4); /* Sender protocol address */
eh->ether_dhost[0] = BROADCAST_MAC[0]; /* Destination MAC address (Broadcast) */
eh->ether_dhost[1] = BROADCAST_MAC[1];
eh->ether_dhost[2] = BROADCAST_MAC[2];
eh->ether_dhost[3] = BROADCAST_MAC[3];
eh->ether_dhost[4] = BROADCAST_MAC[4];
eh->ether_dhost[5] = BROADCAST_MAC[5];
eh->ether_type = htons(ETHER_TYPE_ARP); /* ARP Packet */
sendto(sockfd, eh, sizeof(struct ether_header) + sizeof(struct arphdr), 0, NULL, 0);
}
int main(void) {
struct ifaddrs *ifAddrStruct = NULL;
struct ifaddrs *tmpAddrPtr = NULL;
int sockfd;
char *target_ip = "192.168.1.0"; /* 目标 IP 地址段 */
int i = 0;
int len = 0;
/* 获取本地接口信息 */
if (getifaddrs(&ifAddrStruct) == -1) {
perror("getifaddrs");
return -1;
}
/* 打开原始套接字 */
if ((sockfd = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL))) == -1) {
perror("socket");
freeifaddrs(ifAddrStruct);
return -1;
}
tmpAddrPtr = ifAddrStruct;
while (tmpAddrPtr != NULL) {
if (tmpAddrPtr->ifa_addr != NULL && strcmp(tmpAddrPtr->ifa_name, "lo") != 0) {
char *ip = inet_ntoa(*(struct in_addr *)tmpAddrPtr->ifa_addr);
struct ether_header eh;
struct arphdr arp;
send_arp_request(sockfd, &eh, &arp, (char *)tmpAddrPtr->ifa_ifu.ifu_data, ip, target_ip);
/* 循环发送 ARP 请求 */
for (i = 1; i <= 254; i++) {
char ipaddr[INET_ADDRSTRLEN];
sprintf(ipaddr, "%s.%d", target_ip, i);
send_arp_request(sockfd, &eh, &arp, (char *)tmpAddrPtr->ifa_ifu.ifu_data, ip, ipaddr);
}
}
tmpAddrPtr = tmpAddrPtr->ifa_next;
}
/* 清理 */
freeifaddrs(ifAddrStruct);
close(sockfd);
return 0;
}

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yum install avahi libavahi-client-devel

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avahi_init();

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AvahiClient *client;
client = avahi_client_new(avahi_poll_get(), AVAHI_CLIENT_FLAG_USE_MULTICAST, NULL, NULL);

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static void client_callback(AvahiClient *client, AvahiClientState state, void *userdata) {
// 处理状态变化
}
avahi_client_set_callback(client, client_callback, NULL);

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#include <avahi-common/poll.h>#include <avahi-core/core.h>#include <avahi-client/client.h>#include <stdio.h>#include <stdlib.h>static void service_resolved(AvahiServiceResolvedEvent *event, void *userdata) { printf("Found service '%s' at '%s', port %d.\n", event->name, event->address, event->port);}static void client_callback(AvahiClient *client, AvahiClientState state, void *userdata) { AvahiEntryGroup *group; AvahiEntryGroupState group_state; AvahiServiceResolver *res; if (state != AVAHI_CLIENT_S_RUNNING) return; /* Create a new entry group */ if ((group = avahi_client_new_entry_group(client)) == NULL) { fprintf(stderr, "No memory, aborting.\n"); return; } /* Setup callback for the entry group */ avahi_entry_group_set_callback(group, entry_group_state_callback, userdata); /* Add a service browser to the entry group */ if (avahi_entry_group_add_service_browser(group, AVAHI_IF_UNSPECIFIED, AVAHI_PROTO_INET, "_service._tcp", NULL, NULL) < 0) { fprintf(stderr, "Could not add service browser to entry group.\n"); avahi_entry_group_free(group); return; } /* Commit the entry group */ if (avahi_entry_group_commit(group) < 0) { fprintf(stderr, "Could not commit entry group.\n"); avahi_entry_group_free(group); return; } /* Wait until the entry group is ready */ do { avahi_entry_group_get_state(group, &group_state); } while (group_state != AVAHI_ENTRY_GROUP_COMMITTED); /* Now we can resolve services */ if ((res = avahi_client_alloc_service_resolver(client)) == NULL) { fprintf(stderr, "No memory, aborting.\n"); return; } avahi_service_resolver_set_callback(res, service_resolved, NULL); /* Resolve the first found service */ avahi_service_resolver_resolve(res, AVAHI_IF_UNSPECIFIED, AVAHI_PROTO_INET, "my-service", "local", NULL);}int main(int argc, char *argv[]) { AvahiClient *client; AvahiClientState initial_state; /* Initialize Avahi library */ avahi_init();
/* Create a new client object */ if ((client = avahi_client_new(avahi_poll_get(), AVAHI_CLIENT_FLAG_USE_MULTICAST, client_callback, NULL)) == NULL) { fprintf(stderr, "Failed to create client.\n"); return 1; } /* Get the initial client state */ avahi_client_get_state(client, &initial_state); /* Main loop */ while (initial_state != AVAHI_CLIENT_S_RUNNING) { avahi_client_wait(client, 1000); avahi_client_get_state(client, &initial_state); } /* Clean up */ avahi_client_free(client); return 0;}

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