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c48c8b8701
This will help reproduce certain sequences that were observed.
473 lines
11 KiB
C
473 lines
11 KiB
C
/*
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* Copyright (C) 2010-2022 Willy Tarreau <w@1wt.eu>
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <ctype.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/tcp.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <signal.h>
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#include <stdarg.h>
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#include <sys/stat.h>
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#include <time.h>
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#include <limits.h>
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#include <poll.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#define MAXCONN 1
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const int zero = 0;
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const int one = 1;
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struct conn {
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struct sockaddr_storage cli_addr;
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int fd_bck;
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};
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struct errmsg {
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char *msg;
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int size;
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int len;
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};
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struct sockaddr_storage frt_addr; // listen address
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struct sockaddr_storage srv_addr; // server address
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#define MAXPKTSIZE 16384
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#define MAXREORDER 20
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char trash[MAXPKTSIZE];
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/* history buffer, to resend random packets */
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struct {
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char buf[MAXPKTSIZE];
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size_t len;
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} history[MAXREORDER];
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int history_idx = 0;
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unsigned int rand_rate = 0;
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struct conn conns[MAXCONN]; // sole connection for now
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int fd_frt;
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int nbfd = 0;
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int nbconn = MAXCONN;
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/* display the message and exit with the code */
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__attribute__((noreturn)) void die(int code, const char *format, ...)
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{
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va_list args;
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va_start(args, format);
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vfprintf(stderr, format, args);
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va_end(args);
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exit(code);
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}
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/* Xorshift RNG */
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unsigned int prng_state = ~0U/3; // half bits set, but any seed will fit
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static inline unsigned int prng(unsigned int range)
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{
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unsigned int x = prng_state;
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x ^= x << 13;
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x ^= x >> 17;
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x ^= x << 5;
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prng_state = x;
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return ((unsigned long long)x * (range - 1) + x) >> 32;
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}
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/* converts str in the form [<ipv4>|<ipv6>|<hostname>]:port to struct sockaddr_storage.
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* Returns < 0 with err set in case of error.
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*/
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int addr_to_ss(char *str, struct sockaddr_storage *ss, struct errmsg *err)
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{
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char *port_str;
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int port;
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/* look for the addr/port delimiter, it's the last colon. */
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if ((port_str = strrchr(str, ':')) == NULL)
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port_str = str;
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else
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*port_str++ = 0;
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port = atoi(port_str);
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if (port <= 0 || port > 65535) {
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err->len = snprintf(err->msg, err->size, "Missing/invalid port number: '%s'\n", port_str);
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return -1;
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}
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*port_str = 0; // present an empty address if none was set
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memset(ss, 0, sizeof(*ss));
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if (strrchr(str, ':') != NULL) {
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/* IPv6 address contains ':' */
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ss->ss_family = AF_INET6;
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((struct sockaddr_in6 *)ss)->sin6_port = htons(port);
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if (!inet_pton(ss->ss_family, str, &((struct sockaddr_in6 *)ss)->sin6_addr)) {
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err->len = snprintf(err->msg, err->size, "Invalid IPv6 server address: '%s'", str);
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return -1;
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}
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}
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else {
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ss->ss_family = AF_INET;
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((struct sockaddr_in *)ss)->sin_port = htons(port);
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if (*str == '*' || *str == '\0') { /* INADDR_ANY */
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((struct sockaddr_in *)ss)->sin_addr.s_addr = INADDR_ANY;
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return 0;
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}
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if (!inet_pton(ss->ss_family, str, &((struct sockaddr_in *)ss)->sin_addr)) {
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struct hostent *he = gethostbyname(str);
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if (he == NULL) {
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err->len = snprintf(err->msg, err->size, "Invalid IPv4 server name: '%s'", str);
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return -1;
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}
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((struct sockaddr_in *)ss)->sin_addr = *(struct in_addr *) *(he->h_addr_list);
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}
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}
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return 0;
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}
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/* returns <0 with err in case of error or the front FD */
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int create_udp_listener(struct sockaddr_storage *addr, struct errmsg *err)
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{
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int fd;
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if ((fd = socket(addr->ss_family, SOCK_DGRAM, 0)) == -1) {
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err->len = snprintf(err->msg, err->size, "socket(): '%s'", strerror(errno));
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goto fail;
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}
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if (fcntl(fd, F_SETFL, O_NONBLOCK) == -1) {
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err->len = snprintf(err->msg, err->size, "fcntl(O_NONBLOCK): '%s'", strerror(errno));
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goto fail;
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}
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if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *) &one, sizeof(one)) == -1) {
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err->len = snprintf(err->msg, err->size, "setsockopt(SO_REUSEADDR): '%s'", strerror(errno));
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goto fail;
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}
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#ifdef SO_REUSEPORT
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if (setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, (char *) &one, sizeof(one)) == -1) {
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err->len = snprintf(err->msg, err->size, "setsockopt(SO_REUSEPORT): '%s'", strerror(errno));
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goto fail;
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}
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#endif
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if (bind(fd, (struct sockaddr *)&frt_addr, addr->ss_family == AF_INET6 ?
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sizeof(struct sockaddr_in6) : sizeof(struct sockaddr_in)) == -1) {
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err->len = snprintf(err->msg, err->size, "bind(): '%s'", strerror(errno));
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goto fail;
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}
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/* the socket is ready */
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return fd;
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fail:
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if (fd > -1)
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close(fd);
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fd = -1;
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return fd;
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}
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/* recompute pollfds using frt_fd and scanning nbconn connections.
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* Returns the number of FDs in the set.
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*/
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int update_pfd(struct pollfd *pfd, int frt_fd, struct conn *conns, int nbconn)
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{
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int nbfd = 0;
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int i;
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pfd[nbfd].fd = frt_fd;
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pfd[nbfd].events = POLLIN;
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nbfd++;
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for (i = 0; i < nbconn; i++) {
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if (conns[i].fd_bck < 0)
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continue;
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pfd[nbfd].fd = conns[i].fd_bck;
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pfd[nbfd].events = POLLIN;
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nbfd++;
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}
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return nbfd;
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}
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/* searches a connection using fd <fd> as back connection, returns it if found
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* otherwise NULL.
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*/
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struct conn *conn_bck_lookup(struct conn *conns, int nbconn, int fd)
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{
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int i;
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for (i = 0; i < nbconn; i++) {
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if (conns[i].fd_bck < 0)
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continue;
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if (conns[i].fd_bck == fd)
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return &conns[i];
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}
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return NULL;
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}
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/* Try to establish a connection to <sa>. Return the fd or -1 in case of error */
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int add_connection(struct sockaddr_storage *ss)
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{
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int fd;
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fd = socket(ss->ss_family, SOCK_DGRAM, 0);
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if (fd < 0)
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goto fail;
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if (fcntl(fd, F_SETFL, O_NONBLOCK) == -1)
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goto fail;
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if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)) == -1)
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goto fail;
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if (connect(fd, (struct sockaddr *)ss, ss->ss_family == AF_INET6 ?
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sizeof(struct sockaddr_in6) : sizeof(struct sockaddr_in)) == -1) {
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if (errno != EINPROGRESS)
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goto fail;
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}
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return fd;
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fail:
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if (fd > -1)
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close(fd);
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return -1;
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}
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/* Handle a read operation on an front FD. Will either reuse the existing
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* connection if the source is found, or will allocate a new one, possibly
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* replacing the oldest one. Returns <0 on error or the number of bytes
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* transmitted.
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*/
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int handle_frt(int fd, struct pollfd *pfd, struct conn *conns, int nbconn)
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{
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struct sockaddr_storage addr;
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socklen_t addrlen;
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struct conn *conn;
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char *pktbuf = trash;
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int ret;
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int i;
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if (rand_rate > 0) {
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/* keep a copy of this packet */
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history_idx++;
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if (history_idx >= MAXREORDER)
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history_idx = 0;
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pktbuf = history[history_idx].buf;
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}
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ret = recvfrom(fd, pktbuf, MAXPKTSIZE, MSG_DONTWAIT | MSG_NOSIGNAL,
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(struct sockaddr *)&addr, &addrlen);
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if (rand_rate > 0) {
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history[history_idx].len = ret; // note: we may store -1/EAGAIN
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if (prng(100) < rand_rate) {
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/* return a random buffer or nothing */
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int idx = prng(MAXREORDER + 1) - 1;
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if (idx < 0) {
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/* pretend we didn't receive anything */
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return 0;
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}
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pktbuf = history[idx].buf;
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ret = history[idx].len;
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if (ret < 0)
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errno = EAGAIN;
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}
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}
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if (ret == 0)
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return 0;
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if (ret < 0)
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return errno == EAGAIN ? 0 : -1;
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conn = NULL;
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for (i = 0; i < nbconn; i++) {
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if (addr.ss_family != conns[i].cli_addr.ss_family)
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continue;
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if (memcmp(&conns[i].cli_addr, &addr,
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(addr.ss_family == AF_INET6) ?
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sizeof(struct sockaddr_in6) :
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sizeof(struct sockaddr_in)) != 0)
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continue;
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conn = &conns[i];
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break;
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}
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if (!conn) {
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/* address not found, create a new conn or replace the oldest
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* one. For now we support a single one.
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*/
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conn = &conns[0];
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memcpy(&conn->cli_addr, &addr,
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(addr.ss_family == AF_INET6) ?
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sizeof(struct sockaddr_in6) :
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sizeof(struct sockaddr_in));
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if (conn->fd_bck < 0) {
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/* try to create a new connection */
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conn->fd_bck = add_connection(&srv_addr);
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nbfd = update_pfd(pfd, fd, conns, nbconn); // FIXME: MAXCONN instead ?
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}
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}
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if (conn->fd_bck < 0)
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return 0;
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ret = send(conn->fd_bck, pktbuf, ret, MSG_DONTWAIT | MSG_NOSIGNAL);
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return ret;
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}
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/* Handle a read operation on an FD. Close and return 0 when the read returns zero or an error */
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int handle_bck(int fd, struct pollfd *pfd, struct conn *conns, int nbconn)
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{
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struct sockaddr_storage addr;
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socklen_t addrlen;
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struct conn *conn;
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char *pktbuf = trash;
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int ret;
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if (rand_rate > 0) {
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/* keep a copy of this packet */
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history_idx++;
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if (history_idx >= MAXREORDER)
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history_idx = 0;
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pktbuf = history[history_idx].buf;
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}
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ret = recvfrom(fd, pktbuf, MAXPKTSIZE, MSG_DONTWAIT | MSG_NOSIGNAL,
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(struct sockaddr *)&addr, &addrlen);
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if (rand_rate > 0) {
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history[history_idx].len = ret; // note: we may store -1/EAGAIN
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if (prng(100) < rand_rate) {
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/* return a random buffer or nothing */
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int idx = prng(MAXREORDER + 1) - 1;
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if (idx < 0) {
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/* pretend we didn't receive anything */
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return 0;
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}
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pktbuf = history[idx].buf;
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ret = history[idx].len;
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if (ret < 0)
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errno = EAGAIN;
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}
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}
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if (ret == 0)
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return 0;
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if (ret < 0)
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return errno == EAGAIN ? 0 : -1;
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conn = conn_bck_lookup(conns, nbconn, fd);
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if (!conn)
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return 0;
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ret = sendto(fd_frt, pktbuf, ret, MSG_DONTWAIT | MSG_NOSIGNAL,
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(struct sockaddr *)&conn->cli_addr,
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conn->cli_addr.ss_family == AF_INET6 ?
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sizeof(struct sockaddr_in6) : sizeof(struct sockaddr_in));
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return ret;
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}
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int main(int argc, char **argv)
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{
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struct errmsg err;
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struct pollfd *pfd;
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int i;
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err.len = 0;
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err.size = 100;
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err.msg = malloc(err.size);
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if (argc < 3)
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die(1, "Usage: %s [<laddr>:]<lport> [<saddr>:]<sport> [rand_rate%% [seed]]\n", argv[0]);
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if (addr_to_ss(argv[1], &frt_addr, &err) < 0)
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die(1, "parsing listen address: %s\n", err.msg);
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if (addr_to_ss(argv[2], &srv_addr, &err) < 0)
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die(1, "parsing server address: %s\n", err.msg);
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if (argc > 3)
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rand_rate = atoi(argv[3]);
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if (argc > 4)
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prng_state = atol(argv[4]);
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pfd = calloc(sizeof(struct pollfd), MAXCONN + 1);
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if (!pfd)
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die(1, "out of memory\n");
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fd_frt = create_udp_listener(&frt_addr, &err);
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if (fd_frt < 0)
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die(1, "binding listener: %s\n", err.msg);
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for (i = 0; i < MAXCONN; i++)
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conns[i].fd_bck = -1;
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nbfd = update_pfd(pfd, fd_frt, conns, MAXCONN);
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while (1) {
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/* listen for incoming packets */
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int ret, i;
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ret = poll(pfd, nbfd, 1000);
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if (ret <= 0)
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continue;
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for (i = 0; ret; i++) {
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if (!pfd[i].revents)
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continue;
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ret--;
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if (pfd[i].fd == fd_frt) {
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handle_frt(pfd[i].fd, pfd, conns, nbconn);
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continue;
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}
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handle_bck(pfd[i].fd, pfd, conns, nbconn);
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}
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}
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}
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