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/* sockdebug.c - Network UPS Tools driver-server socket debugger
Source variant for POSIX-compliant builds of NUT
Copyright (C) 2003 Russell Kroll <rkroll@exploits.org>
Copyright (C) 2023 Jim Klimov <jimklimov+nut@gmail.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "common.h"
#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/un.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/socket.h>
#include "parseconf.h"
#include "nut_stdint.h"
static PCONF_CTX_t sock_ctx;
static void sock_arg(size_t numarg, char **arg)
{
size_t i;
printf("numarg=%" PRIuSIZE " : ", numarg);
for (i = 0; i < numarg; i++)
printf("[%s] ", arg[i]);
printf("\n");
}
static int socket_connect(const char *sockfn)
{
int ret, fd;
struct sockaddr_un sa;
check_unix_socket_filename(sockfn);
memset(&sa, '\0', sizeof(sa));
sa.sun_family = AF_UNIX;
snprintf(sa.sun_path, sizeof(sa.sun_path), "%s", sockfn);
fd = socket(AF_UNIX, SOCK_STREAM, 0);
if (fd < 0) {
perror("socket");
exit(EXIT_FAILURE);
}
ret = connect(fd, (struct sockaddr *) &sa, sizeof(sa));
if (ret < 0 && !strchr(sockfn, '/')) {
snprintf(sa.sun_path, sizeof(sa.sun_path), "%s/%s",
dflt_statepath(), sockfn);
ret = connect(fd, (struct sockaddr *) &sa, sizeof(sa));
}
if (ret < 0) {
perror("connect");
exit(EXIT_FAILURE);
}
#if 0
ret = fcntl(fd, F_GETFL, 0);
if (ret < 0) {
perror("fcntl(get)");
exit(EXIT_FAILURE);
}
ret = fcntl(fd, F_SETFL, ret | O_NDELAY);
if (ret < 0) {
perror("fcntl(set)");
exit(EXIT_FAILURE);
}
#endif
return fd;
}
static void read_sock(int fd)
{
int i, ret;
char buf[SMALLBUF];
ret = read(fd, buf, sizeof(buf));
if (ret == 0) {
fprintf(stderr, "read on socket returned 0\n");
exit(EXIT_FAILURE);
}
if (ret < 0) {
perror("read sockfd");
exit(EXIT_FAILURE);
}
for (i = 0; i < ret; i++) {
switch (pconf_char(&sock_ctx, buf[i])) {
case 1:
sock_arg(sock_ctx.numargs, sock_ctx.arglist);
break;
case -1:
printf("Parse error: [%s]\n", sock_ctx.errmsg);
break;
default:
break;
}
}
}
int main(int argc, char **argv)
{
const char *prog = xbasename(argv[0]);
int ret, sockfd;
if (argc != 2
|| (argc > 1 && (!strcmp(argv[1], "-h") || !strcmp(argv[1], "--help")))
) {
fprintf(stderr, "usage: %s <socket name>\n", prog);
fprintf(stderr, " %s /var/state/ups/apcsmart-ttyS1\n",
argv[0]);
fprintf(stderr, " or %s apcsmart-ttyS1\n",
argv[0]);
fprintf(stderr, " for socket files placed in the standard location\n");
fprintf(stderr, "\n%s", suggest_doc_links(prog, NULL));
exit(EXIT_SUCCESS);
}
sockfd = socket_connect(argv[1]);
printf("connected: fd %d\n", sockfd);
pconf_init(&sock_ctx, NULL);
for (;;) {
struct timeval tv;
fd_set rfds;
int maxfd;
tv.tv_sec = 2;
tv.tv_usec = 0;
FD_ZERO(&rfds);
FD_SET(fileno(stdin), &rfds);
FD_SET(sockfd, &rfds);
/* paranoia */
maxfd = (sockfd > fileno(stdin)) ? sockfd : fileno(stdin);
ret = select(maxfd + 1, &rfds, NULL, NULL, &tv);
if (FD_ISSET(sockfd, &rfds))
read_sock(sockfd);
if (FD_ISSET(fileno(stdin), &rfds)) {
char buf[SMALLBUF];
if (!fgets(buf, sizeof(buf), stdin)) {
perror("fgets from stdin");
exit(EXIT_FAILURE);
}
ret = write(sockfd, buf, strlen(buf));
if ((ret < 0) || (ret != (int) strlen(buf))) {
perror("write to socket");
exit(EXIT_FAILURE);
}
}
}
#if (defined HAVE_PRAGMA_GCC_DIAGNOSTIC_PUSH_POP) && (defined HAVE_PRAGMA_GCC_DIAGNOSTIC_IGNORED_UNREACHABLE_CODE)
# pragma GCC diagnostic push
# pragma GCC diagnostic ignored "-Wunreachable-code"
#endif
#ifdef __clang__
# pragma clang diagnostic push
# pragma clang diagnostic ignored "-Wunreachable-code"
#endif
/* NOTREACHED */
exit(EXIT_FAILURE);
#ifdef __clang__
# pragma clang diagnostic pop
#endif
#if (defined HAVE_PRAGMA_GCC_DIAGNOSTIC_PUSH_POP) && (defined HAVE_PRAGMA_GCC_DIAGNOSTIC_IGNORED_UNREACHABLE_CODE)
# pragma GCC diagnostic pop
#endif
}
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