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- #include <iostream>
- #include <WS2tcpip.h>
- #pragma comment (lib, "ws2_32.lib")
- /*
- src:
- https://beej.us/guide/bgnet/html/
- ** listener.c -- a datagram sockets "server" demo
- */
- #include <stdio.h>
- #include <stdlib.h>
- #include <unistd.h>
- #include <errno.h>
- #include <string.h>
- #include <sys/types.h>
- #include <sys/socket.h>
- #include <netinet/in.h>
- #include <arpa/inet.h>
- #include <netdb.h>
- #define MYPORT "4950" // the port users will be connecting to
- #define MAXBUFLEN 100
- // get sockaddr, IPv4 or IPv6:
- void *get_in_addr(struct sockaddr *sa)
- {
- if (sa->sa_family == AF_INET) {
- return &(((struct sockaddr_in*)sa)->sin_addr);
- }
- return &(((struct sockaddr_in6*)sa)->sin6_addr);
- }
- int main(void)
- {
- int sockfd;
- struct addrinfo hints, *servinfo, *p;
- int rv;
- int numbytes;
- struct sockaddr_storage their_addr;
- char buf[MAXBUFLEN];
- socklen_t addr_len;
- char s[INET6_ADDRSTRLEN];
- memset(&hints, 0, sizeof hints);
- hints.ai_family = AF_INET6; // set to AF_INET to use IPv4
- hints.ai_socktype = SOCK_DGRAM;
- hints.ai_flags = AI_PASSIVE; // use my IP
- if ((rv = getaddrinfo(NULL, MYPORT, &hints, &servinfo)) != 0) {
- fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(rv));
- return 1;
- }
- // loop through all the results and bind to the first we can
- for(p = servinfo; p != NULL; p = p->ai_next) {
- if ((sockfd = socket(p->ai_family, p->ai_socktype,
- p->ai_protocol)) == -1) {
- perror("listener: socket");
- continue;
- }
- if (bind(sockfd, p->ai_addr, p->ai_addrlen) == -1) {
- close(sockfd);
- perror("listener: bind");
- continue;
- }
- break;
- }
- if (p == NULL) {
- fprintf(stderr, "listener: failed to bind socket\n");
- return 2;
- }
- freeaddrinfo(servinfo);
- printf("listener: waiting to recvfrom...\n");
- addr_len = sizeof their_addr;
- if ((numbytes = recvfrom(sockfd, buf, MAXBUFLEN-1 , 0,
- (struct sockaddr *)&their_addr, &addr_len)) == -1) {
- perror("recvfrom");
- exit(1);
- }
- printf("listener: got packet from %s\n",
- inet_ntop(their_addr.ss_family,
- get_in_addr((struct sockaddr *)&their_addr),
- s, sizeof s));
- printf("listener: packet is %d bytes long\n", numbytes);
- buf[numbytes] = '\0';
- printf("listener: packet contains \"%s\"\n", buf);
- close(sockfd);
- return 0;
- }
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