66 lines
1.7 KiB
C
66 lines
1.7 KiB
C
#include "udpserver.h"
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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int resolve(const char *host, unsigned short port, struct addrinfo** addr) {
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struct addrinfo hints = {
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.ai_family = AF_UNSPEC,
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.ai_socktype = SOCK_STREAM,
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.ai_flags = AI_PASSIVE,
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};
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char port_buf[8];
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snprintf(port_buf, sizeof port_buf, "%u", port);
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return getaddrinfo(host, port_buf, &hints, addr);
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}
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int resolve_sa(const char *host, unsigned short port, union sockaddr_union *res) {
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struct addrinfo *ainfo = 0;
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int ret;
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SOCKADDR_UNION_AF(res) = AF_UNSPEC;
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if((ret = resolve(host, port, &ainfo))) return ret;
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memcpy(res, ainfo->ai_addr, ainfo->ai_addrlen);
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freeaddrinfo(ainfo);
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return 0;
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}
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int bindtoip(int fd, union sockaddr_union *bindaddr) {
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socklen_t sz = SOCKADDR_UNION_LENGTH(bindaddr);
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if(sz)
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return bind(fd, (struct sockaddr*) bindaddr, sz);
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return 0;
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}
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int server_waitclient(struct server *server, struct client* client, void* buf, size_t *buflen) {
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socklen_t clen = sizeof client->addr;
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ssize_t ret = recvfrom(server->fd, buf, *buflen, 0, (void*)&client->addr, &clen);
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if(ret >= 0) {
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*buflen = ret;
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return 0;
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}
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return ret;
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}
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int server_setup(struct server *server, const char* listenip, unsigned short port) {
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struct addrinfo *ainfo = 0;
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if(resolve(listenip, port, &ainfo)) return -1;
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struct addrinfo* p;
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int listenfd = -1;
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for(p = ainfo; p; p = p->ai_next) {
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if((listenfd = socket(p->ai_family, SOCK_DGRAM, 0)) < 0)
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continue;
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int yes = 1;
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setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int));
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if(bind(listenfd, p->ai_addr, p->ai_addrlen) < 0) {
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close(listenfd);
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listenfd = -1;
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continue;
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}
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break;
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}
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freeaddrinfo(ainfo);
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if(listenfd < 0) return -2;
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server->fd = listenfd;
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return 0;
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}
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