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