91 lines
2.3 KiB
C
91 lines
2.3 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <errno.h>
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#include "evt_core.h"
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#include "net_tools.h"
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int on_udp(struct evt_core_ctx* ctx, struct evt_core_fdinfo* fdinfo) {
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char buffer[1500];
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ssize_t nread, nwritten;
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struct sockaddr_in addr;
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socklen_t addrlen = sizeof(addr);
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nread = recvfrom(fdinfo->fd, buffer, sizeof(buffer), MSG_TRUNC, (struct sockaddr*)&addr, &addrlen);
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if (nread == -1 && errno == EAGAIN) return 1; // Read done
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if (nread <= 0 || nread > sizeof(buffer)) {
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fprintf(stderr, "Message is either truncated or an error occured. nread=%ld\n", nread);
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perror("read errno");
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exit(EXIT_FAILURE);
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}
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nwritten = sendto(fdinfo->fd, buffer, nread, 0, (struct sockaddr*)&addr, addrlen);
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// @FIXME don't support EAGAIN on write. Could be intended, you don't think so?
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if (nwritten != nread) {
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fprintf(stderr, "Didn't write the same number of bytes as read. nread=%ld, nwritten=%ld\n", nread, nwritten);
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perror("write errno");
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exit(EXIT_FAILURE);
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}
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return 0;
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}
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int main(int argc, char** argv) {
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setvbuf(stdout, NULL, _IONBF, 0);
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printf("~ udpecho ~\n");
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int opt, udp_sock, verbose = 0;
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char *port = NULL, *bindhost = NULL;
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struct evt_core_ctx evts = {0};
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// 1. Parse parameters
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while ((opt = getopt(argc, argv, "b:p:v")) != -1) {
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switch(opt) {
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case 'v':
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verbose++;
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break;
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case 'p':
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port = optarg;
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break;
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case 'b':
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bindhost = optarg;
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break;
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default:
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goto usage;
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}
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}
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if (bindhost == NULL) bindhost = "127.0.0.1";
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// 2. Register category
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struct evt_core_cat udp_read = {
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.app_ctx = NULL,
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.free_app_ctx = NULL,
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.cb = on_udp,
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.err_cb = NULL,
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.name = "udp-read",
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.flags = EPOLLIN | EPOLLET,
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.socklist = NULL
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};
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evt_core_init(&evts, verbose);
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evt_core_add_cat(&evts, &udp_read);
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// 3. Register UDP socket
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udp_sock = create_udp_server (bindhost, port);
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char url[1024];
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struct evt_core_cat cat = {0};
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struct evt_core_fdinfo fdinfo = {0};
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fdinfo.cat = &cat;
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fdinfo.url = url;
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fdinfo.fd = udp_sock;
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sprintf(url, "udp:rw:127.0.0.1:%s", port);
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fdinfo.cat->name = "udp-read";
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evt_core_add_fd(&evts, &fdinfo);
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// 4. Start main loop
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evt_core_loop (&evts);
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return 0;
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usage:
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fprintf(stderr, "Usage: %s -p <port> [-v] [-b ip]\n", argv[0]);
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}
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