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// SPDX-License-Identifier: GPL-2.0
#include <error.h>
#include <fcntl.h>
#include <limits.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <netinet/tcp.h>
#include <errno.h>
static int cfg_server;
static int cfg_client;
static int cfg_port = 8000;
static struct sockaddr_in6 cfg_addr;
static char *cfg_outfile;
static int parse_address(const char *str, int port, struct sockaddr_in6 *sin6)
{
int ret;
sin6->sin6_family = AF_INET6;
sin6->sin6_port = htons(port);
ret = inet_pton(sin6->sin6_family, str, &sin6->sin6_addr);
if (ret != 1) {
/* fallback to plain IPv4 */
ret = inet_pton(AF_INET, str, &sin6->sin6_addr.s6_addr32[3]);
if (ret != 1)
return -1;
/* add ::ffff prefix */
sin6->sin6_addr.s6_addr32[0] = 0;
sin6->sin6_addr.s6_addr32[1] = 0;
sin6->sin6_addr.s6_addr16[4] = 0;
sin6->sin6_addr.s6_addr16[5] = 0xffff;
}
return 0;
}
static void run_server(void)
{
unsigned long qlen = 32;
int fd, opt, connfd;
socklen_t len;
char buf[64];
FILE *outfile;
outfile = fopen(cfg_outfile, "w");
if (!outfile)
error(1, errno, "fopen() outfile");
fd = socket(AF_INET6, SOCK_STREAM, 0);
if (fd == -1)
error(1, errno, "socket()");
opt = 1;
if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)) < 0)
error(1, errno, "setsockopt(SO_REUSEADDR)");
if (setsockopt(fd, SOL_TCP, TCP_FASTOPEN, &qlen, sizeof(qlen)) < 0)
error(1, errno, "setsockopt(TCP_FASTOPEN)");
if (bind(fd, (struct sockaddr *)&cfg_addr, sizeof(cfg_addr)) < 0)
error(1, errno, "bind()");
if (listen(fd, 5) < 0)
error(1, errno, "listen()");
len = sizeof(cfg_addr);
connfd = accept(fd, (struct sockaddr *)&cfg_addr, &len);
if (connfd < 0)
error(1, errno, "accept()");
len = sizeof(opt);
if (getsockopt(connfd, SOL_SOCKET, SO_INCOMING_NAPI_ID, &opt, &len) < 0)
error(1, errno, "getsockopt(SO_INCOMING_NAPI_ID)");
read(connfd, buf, 64);
fprintf(outfile, "%d\n", opt);
fclose(outfile);
close(connfd);
close(fd);
}
static void run_client(void)
{
int fd;
char *msg = "Hello, world!";
fd = socket(AF_INET6, SOCK_STREAM, 0);
if (fd == -1)
error(1, errno, "socket()");
sendto(fd, msg, strlen(msg), MSG_FASTOPEN, (struct sockaddr *)&cfg_addr, sizeof(cfg_addr));
close(fd);
}
static void usage(const char *filepath)
{
error(1, 0, "Usage: %s (-s|-c) -h<server_ip> -p<port> -o<outfile> ", filepath);
}
static void parse_opts(int argc, char **argv)
{
struct sockaddr_in6 *addr6 = (void *) &cfg_addr;
char *addr = NULL;
int ret;
int c;
if (argc <= 1)
usage(argv[0]);
while ((c = getopt(argc, argv, "sch:p:o:")) != -1) {
switch (c) {
case 's':
if (cfg_client)
error(1, 0, "Pass one of -s or -c");
cfg_server = 1;
break;
case 'c':
if (cfg_server)
error(1, 0, "Pass one of -s or -c");
cfg_client = 1;
break;
case 'h':
addr = optarg;
break;
case 'p':
cfg_port = strtoul(optarg, NULL, 0);
break;
case 'o':
cfg_outfile = strdup(optarg);
if (!cfg_outfile)
error(1, 0, "outfile invalid");
break;
}
}
if (cfg_server && addr)
error(1, 0, "Server cannot have -h specified");
memset(addr6, 0, sizeof(*addr6));
addr6->sin6_family = AF_INET6;
addr6->sin6_port = htons(cfg_port);
addr6->sin6_addr = in6addr_any;
if (addr) {
ret = parse_address(addr, cfg_port, addr6);
if (ret)
error(1, 0, "Client address parse error: %s", addr);
}
}
int main(int argc, char **argv)
{
parse_opts(argc, argv);
if (cfg_server)
run_server();
else if (cfg_client)
run_client();
return 0;
}
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