tor_multipath_voip/src/udp_echo.c

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