359 lines
7.8 KiB
C
359 lines
7.8 KiB
C
#define _GNU_SOURCE // for POLLRDHUP
|
|
#include <sys/socket.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/types.h>
|
|
#include <netinet/in.h>
|
|
#include <netinet/tcp.h>
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <poll.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
|
|
/* for OSes which don't have it */
|
|
#ifndef POLLRDHUP
|
|
#define POLLRDHUP 0
|
|
#endif
|
|
|
|
int verbose = 0;
|
|
int cmd = 0;
|
|
int cmdstep = 0;
|
|
int zero = 0;
|
|
int one = 1;
|
|
int lfd = -1;
|
|
int cfd = -1;
|
|
int sfd = -1;
|
|
struct sockaddr_in saddr, caddr;
|
|
socklen_t salen, calen;
|
|
|
|
void usage(const char *arg0)
|
|
{
|
|
printf("Usage: %s [ arg [<action>[,...]] ] ...\n"
|
|
"args:\n"
|
|
" -h display this help\n"
|
|
" -v verbose mode (shows ret values)\n"
|
|
" -c <actions> perform <action> on client side socket\n"
|
|
" -s <actions> perform <action> on server side socket\n"
|
|
" -l <actions> perform <action> on listening socket\n"
|
|
"\n"
|
|
"actions for -c/-s/-l (multiple may be delimited by commas) :\n"
|
|
" acc accept on listener, implicit before first -s\n"
|
|
" snd send a few bytes of data\n"
|
|
" mor send a few bytes of data with MSG_MORE\n"
|
|
" rcv receive a few bytes of data\n"
|
|
" drn drain: receive till zero\n"
|
|
" shr SHUT_RD : shutdown read side\n"
|
|
" shw SHUT_WR : shutdown write side\n"
|
|
" shb SHUT_RDWR : shutdown both sides\n"
|
|
" lin disable lingering on the socket\n"
|
|
" clo close the file descriptor\n"
|
|
" pol poll() for any event\n"
|
|
"\n", arg0);
|
|
}
|
|
|
|
void die(const char *msg)
|
|
{
|
|
if (msg)
|
|
fprintf(stderr, "%s\n", msg);
|
|
exit(1);
|
|
}
|
|
|
|
const char *get_errno(int ret)
|
|
{
|
|
static char errmsg[100];
|
|
|
|
if (ret >= 0)
|
|
return "";
|
|
|
|
snprintf(errmsg, sizeof(errmsg), " (%s)", strerror(errno));
|
|
return errmsg;
|
|
}
|
|
|
|
void do_acc(int fd)
|
|
{
|
|
int ret;
|
|
|
|
calen = sizeof(caddr);
|
|
ret = accept(lfd, (struct sockaddr*)&caddr, &calen);
|
|
if (sfd < 0)
|
|
sfd = ret;
|
|
if (verbose)
|
|
printf("cmd #%d stp #%d: %s(%d): ret=%d%s\n", cmd, cmdstep, __FUNCTION__, fd, ret, get_errno(ret));
|
|
}
|
|
|
|
void do_snd(int fd)
|
|
{
|
|
int ret;
|
|
|
|
ret = send(fd, "foo", 3, MSG_NOSIGNAL|MSG_DONTWAIT);
|
|
if (verbose)
|
|
printf("cmd #%d stp #%d: %s(%d): ret=%d%s\n", cmd, cmdstep, __FUNCTION__, fd, ret, get_errno(ret));
|
|
}
|
|
|
|
void do_mor(int fd)
|
|
{
|
|
int ret;
|
|
|
|
ret = send(fd, "foo", 3, MSG_NOSIGNAL|MSG_DONTWAIT|MSG_MORE);
|
|
if (verbose)
|
|
printf("cmd #%d stp #%d: %s(%d): ret=%d%s\n", cmd, cmdstep, __FUNCTION__, fd, ret, get_errno(ret));
|
|
}
|
|
|
|
void do_rcv(int fd)
|
|
{
|
|
char buf[10];
|
|
int ret;
|
|
|
|
ret = recv(fd, buf, sizeof(buf), MSG_DONTWAIT);
|
|
if (verbose)
|
|
printf("cmd #%d stp #%d: %s(%d): ret=%d%s\n", cmd, cmdstep, __FUNCTION__, fd, ret, get_errno(ret));
|
|
}
|
|
|
|
void do_drn(int fd)
|
|
{
|
|
char buf[16384];
|
|
int total = -1;
|
|
int ret;
|
|
|
|
while (1) {
|
|
ret = recv(fd, buf, sizeof(buf), 0);
|
|
if (ret <= 0)
|
|
break;
|
|
if (total < 0)
|
|
total = 0;
|
|
total += ret;
|
|
}
|
|
|
|
if (verbose)
|
|
printf("cmd #%d stp #%d: %s(%d): ret=%d%s\n", cmd, cmdstep, __FUNCTION__, fd, total, get_errno(ret));
|
|
}
|
|
|
|
void do_shr(int fd)
|
|
{
|
|
int ret;
|
|
|
|
ret = shutdown(fd, SHUT_RD);
|
|
if (verbose)
|
|
printf("cmd #%d stp #%d: %s(%d): ret=%d%s\n", cmd, cmdstep, __FUNCTION__, fd, ret, get_errno(ret));
|
|
}
|
|
|
|
void do_shw(int fd)
|
|
{
|
|
int ret;
|
|
|
|
ret = shutdown(fd, SHUT_WR);
|
|
if (verbose)
|
|
printf("cmd #%d stp #%d: %s(%d): ret=%d%s\n", cmd, cmdstep, __FUNCTION__, fd, ret, get_errno(ret));
|
|
}
|
|
|
|
void do_shb(int fd)
|
|
{
|
|
int ret;
|
|
|
|
ret = shutdown(fd, SHUT_RDWR);
|
|
if (verbose)
|
|
printf("cmd #%d stp #%d: %s(%d): ret=%d%s\n", cmd, cmdstep, __FUNCTION__, fd, ret, get_errno(ret));
|
|
}
|
|
|
|
void do_lin(int fd)
|
|
{
|
|
struct linger nolinger = { .l_onoff = 1, .l_linger = 0 };
|
|
int ret;
|
|
|
|
ret = setsockopt(fd, SOL_SOCKET, SO_LINGER, &nolinger, sizeof(nolinger));
|
|
if (verbose)
|
|
printf("cmd #%d stp #%d: %s(%d): ret=%d%s\n", cmd, cmdstep, __FUNCTION__, fd, ret, get_errno(ret));
|
|
}
|
|
|
|
void do_clo(int fd)
|
|
{
|
|
int ret;
|
|
|
|
ret = close(fd);
|
|
if (verbose)
|
|
printf("cmd #%d stp #%d: %s(%d): ret=%d%s\n", cmd, cmdstep, __FUNCTION__, fd, ret, get_errno(ret));
|
|
}
|
|
|
|
void do_pol(int fd)
|
|
{
|
|
struct pollfd fds = { .fd = fd, .events = POLLIN|POLLOUT|POLLRDHUP, .revents=0 };
|
|
int ret;
|
|
|
|
ret = poll(&fds, 1, 0);
|
|
if (verbose) {
|
|
printf("cmd #%d stp #%d: %s(%d): ret=%d%s ev=%#x ", cmd, cmdstep, __FUNCTION__, fd, ret, get_errno(ret), ret > 0 ? fds.revents : 0);
|
|
if (ret > 0 && fds.revents) {
|
|
int flags, flag;
|
|
putchar('(');
|
|
|
|
for (flags = fds.revents; flags; flags ^= flag) {
|
|
flag = flags ^ (flags & (flags - 1)); // keep lowest bit only
|
|
switch (flag) {
|
|
case POLLIN: printf("IN"); break;
|
|
case POLLOUT: printf("OUT"); break;
|
|
case POLLPRI: printf("PRI"); break;
|
|
case POLLHUP: printf("HUP"); break;
|
|
case POLLERR: printf("ERR"); break;
|
|
case POLLNVAL: printf("NVAL"); break;
|
|
#if POLLRDHUP
|
|
case POLLRDHUP: printf("RDHUP"); break;
|
|
#endif
|
|
default: printf("???[%#x]", flag); break;
|
|
}
|
|
if (flags ^ flag)
|
|
putchar(' ');
|
|
}
|
|
putchar(')');
|
|
}
|
|
putchar('\n');
|
|
}
|
|
}
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
const char *arg0;
|
|
char *word, *next;
|
|
int fd;
|
|
|
|
/* listener */
|
|
lfd = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
|
|
if (lfd < 0)
|
|
die("socket(l)");
|
|
|
|
setsockopt(lfd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
|
|
|
|
memset(&saddr, 0, sizeof(saddr));
|
|
saddr.sin_family = AF_INET;
|
|
saddr.sin_port = htons(0);
|
|
salen = sizeof(saddr);
|
|
|
|
if (bind(lfd, (struct sockaddr *)&saddr, salen) < 0)
|
|
die("bind()");
|
|
|
|
if (listen(lfd, 1000) < 0)
|
|
die("listen()");
|
|
|
|
if (getsockname(lfd, (struct sockaddr *)&saddr, &salen) < 0)
|
|
die("getsockname()");
|
|
|
|
|
|
/* client */
|
|
cfd = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
|
|
if (cfd < 0)
|
|
die("socket(c)");
|
|
|
|
if (connect(cfd, (const struct sockaddr*)&saddr, salen) == -1)
|
|
die("connect()");
|
|
|
|
/* connection is pending in accept queue, accept() will either be
|
|
* explicit with "-l acc" below, or implicit on "-s <cmd>"
|
|
*/
|
|
|
|
arg0 = argv[0];
|
|
if (argc < 2) {
|
|
usage(arg0);
|
|
exit(1);
|
|
}
|
|
|
|
write(1, "#### BEGIN ####\n", 16); // add a visible delimiter in the traces
|
|
|
|
while (argc > 1) {
|
|
argc--; argv++;
|
|
if (**argv != '-') {
|
|
usage(arg0);
|
|
exit(1);
|
|
}
|
|
|
|
fd = -1;
|
|
switch (argv[0][1]) {
|
|
case 'h' :
|
|
usage(arg0);
|
|
exit(0);
|
|
break;
|
|
case 'v' :
|
|
verbose++;
|
|
break;
|
|
case 'c' :
|
|
cmd++; cmdstep = 0;
|
|
fd = cfd;
|
|
break;
|
|
case 's' :
|
|
cmd++; cmdstep = 0;
|
|
if (sfd < 0)
|
|
do_acc(lfd);
|
|
if (sfd < 0)
|
|
die("accept()");
|
|
fd = sfd;
|
|
break;
|
|
case 'l' :
|
|
cmd++; cmdstep = 0;
|
|
fd = lfd;
|
|
break;
|
|
default : usage(arg0); exit(1); break;
|
|
}
|
|
|
|
if (fd >= 0) { /* an action is required */
|
|
if (argc < 2) {
|
|
usage(arg0);
|
|
exit(1);
|
|
}
|
|
|
|
for (word = argv[1]; word && *word; word = next) {
|
|
next = strchr(word, ',');
|
|
if (next)
|
|
*(next++) = 0;
|
|
cmdstep++;
|
|
if (strcmp(word, "acc") == 0) {
|
|
do_acc(fd);
|
|
}
|
|
else if (strcmp(word, "snd") == 0) {
|
|
do_snd(fd);
|
|
}
|
|
else if (strcmp(word, "mor") == 0) {
|
|
do_mor(fd);
|
|
}
|
|
else if (strcmp(word, "rcv") == 0) {
|
|
do_rcv(fd);
|
|
}
|
|
else if (strcmp(word, "drn") == 0) {
|
|
do_drn(fd);
|
|
}
|
|
else if (strcmp(word, "shb") == 0) {
|
|
do_shb(fd);
|
|
}
|
|
else if (strcmp(word, "shr") == 0) {
|
|
do_shr(fd);
|
|
}
|
|
else if (strcmp(word, "shw") == 0) {
|
|
do_shw(fd);
|
|
}
|
|
else if (strcmp(word, "lin") == 0) {
|
|
do_lin(fd);
|
|
}
|
|
else if (strcmp(word, "clo") == 0) {
|
|
do_clo(fd);
|
|
}
|
|
else if (strcmp(word, "pol") == 0) {
|
|
do_pol(fd);
|
|
}
|
|
else {
|
|
printf("Ignoring unknown action '%s' in step #%d of cmd #%d\n", word, cmdstep, cmd);
|
|
}
|
|
}
|
|
argc--; argv++;
|
|
}
|
|
}
|
|
|
|
write(1, "#### END ####\n", 14); // add a visible delimiter in the traces
|
|
|
|
if (!cmd) {
|
|
printf("No command was requested!\n");
|
|
usage(arg0);
|
|
exit(1);
|
|
}
|
|
|
|
return 0;
|
|
}
|