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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Copyright by The HDF Group. *
* All rights reserved. *
* *
* This file is part of HDF5. The full HDF5 copyright notice, including *
* terms governing use, modification, and redistribution, is contained in *
* the COPYING file, which can be found at the root of the source code *
* distribution tree, or in https://www.hdfgroup.org/licenses. *
* If you do not have access to either file, you may request a copy from *
* help@hdfgroup.org. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/*
* Purpose: Stop the mirror server
* Exists for cross-platform, optionally remote shutdown.
*/
#include "H5private.h" /* System compatability call-wrapper macros */
#ifdef H5_HAVE_MIRROR_VFD
#define MSHS_OPTS_MAGIC 0x613B1C15u /* sanity-checking constant */
#define MSHS_IP_STR_SIZE 20
#define MSHS_DEFAULT_IP "127.0.0.1"
#define MSHS_DEFAULT_PORTNO 3000
/* ----------------------------------------------------------------------------
* Structure: struct mshs_opts
*
* Purpose: Convenience structure to hold options as parsed from the
* command line.
*
* `magic` (uint32_t)
* Semi-unique constant to help verify pointer integrity.
*
* `help` (int)
* Flag that the help argument was present.
*
* `portno` (int)
* Port number, as received from arguments.
*
* `ip` (char *)
* IP address string as received from arguments.
*
* ----------------------------------------------------------------------------
*/
struct mshs_opts {
uint32_t magic;
int help;
int portno;
char ip[MSHS_IP_STR_SIZE + 1];
};
/* ----------------------------------------------------------------------------
* Function: usage
*
* Purpose: Print usage message to stdout.
* ----------------------------------------------------------------------------
*/
static void
usage(void)
{
HDprintf("mirror_server_halten_sie [options]\n"
"System-independent Mirror Server shutdown program.\n"
"Sends shutdown message to Mirror Server at given IP:port\n"
"\n"
"Options:\n"
" -h | --help Print this usage message and exit.\n"
" --ip=ADDR IP Address of remote server (defaut %s)\n"
" --port=PORT Handshake port of remote server (default %d)\n",
MSHS_DEFAULT_IP, MSHS_DEFAULT_PORTNO);
} /* end usage() */
/* ----------------------------------------------------------------------------
* Function: parse_args
*
* Purpose: Parse command-line arguments, populating the options struct
* pointer as appropriate.
* Default values will be set for unspecified options.
*
* Return: 0 on success, negative (-1) if error.
* ----------------------------------------------------------------------------
*/
static int
parse_args(int argc, char **argv, struct mshs_opts *opts)
{
int i = 0;
opts->magic = MSHS_OPTS_MAGIC;
opts->help = 0;
opts->portno = MSHS_DEFAULT_PORTNO;
HDstrncpy(opts->ip, MSHS_DEFAULT_IP, MSHS_IP_STR_SIZE);
for (i = 1; i < argc; i++) { /* start with first possible option argument */
if (!HDstrncmp(argv[i], "-h", 3) || !HDstrncmp(argv[i], "--help", 7)) {
opts->help = 1;
}
else if (!HDstrncmp(argv[i], "--ip=", 5)) {
HDstrncpy(opts->ip, argv[i] + 5, MSHS_IP_STR_SIZE);
}
else if (!HDstrncmp(argv[i], "--port=", 7)) {
opts->portno = HDatoi(argv[i] + 7);
}
else {
HDprintf("Unrecognized option: '%s'\n", argv[i]);
usage();
opts->magic++; /* invalidate for sanity */
return -1;
}
} /* end for each argument from command line */
/* auto-replace 'localhost' with numeric IP */
if (!HDstrncmp(opts->ip, "localhost", 10)) { /* include null terminator */
HDstrncpy(opts->ip, "127.0.0.1", MSHS_IP_STR_SIZE);
}
return 0;
} /* end parse_args() */
/* ----------------------------------------------------------------------------
* Function: send_shutdown
*
* Purpose: Create socket and send shutdown signal to remote server.
*
* Return: 0 on success, negative (-1) if error.
* ----------------------------------------------------------------------------
*/
static int
send_shutdown(struct mshs_opts *opts)
{
int live_socket;
struct sockaddr_in target_addr;
if (opts->magic != MSHS_OPTS_MAGIC) {
HDprintf("invalid options structure\n");
return -1;
}
live_socket = HDsocket(AF_INET, SOCK_STREAM, 0);
if (live_socket < 0) {
HDprintf("ERROR socket()\n");
return -1;
}
target_addr.sin_family = AF_INET;
target_addr.sin_port = HDhtons((uint16_t)opts->portno);
target_addr.sin_addr.s_addr = HDinet_addr(opts->ip);
HDmemset(target_addr.sin_zero, '\0', sizeof(target_addr.sin_zero));
if (HDconnect(live_socket, (struct sockaddr *)&target_addr, (socklen_t)sizeof(target_addr)) < 0) {
HDprintf("ERROR connect() (%d)\n%s\n", errno, HDstrerror(errno));
return -1;
}
if (HDwrite(live_socket, "SHUTDOWN", 9) == -1) {
HDprintf("ERROR write() (%d)\n%s\n", errno, HDstrerror(errno));
return -1;
}
if (HDclose(live_socket) < 0) {
HDprintf("ERROR close() can't close socket\n");
return -1;
}
return 0;
} /* end send_shutdown() */
/* ------------------------------------------------------------------------- */
int
main(int argc, char **argv)
{
struct mshs_opts opts;
if (parse_args(argc, argv, &opts) < 0) {
HDprintf("Unable to parse arguments\n");
HDexit(EXIT_FAILURE);
}
if (opts.help) {
usage();
HDexit(EXIT_FAILURE);
}
if (send_shutdown(&opts) < 0) {
HDprintf("Unable to send shutdown command\n");
HDexit(EXIT_FAILURE);
}
HDexit(EXIT_SUCCESS);
} /* end main() */
#else /* H5_HAVE_MIRROR_VFD */
/* ------------------------------------------------------------------------- */
int
main(void)
{
HDprintf("Mirror VFD not built -- unable to perform shutdown.\n");
HDexit(EXIT_FAILURE);
}
#endif /* H5_HAVE_MIRROR_VFD */
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