279 lines
8.2 KiB
C
279 lines
8.2 KiB
C
/* Utility to start or stop system services. Requests are sent to the
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* reincarnation server that does the actual work.
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*
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* Changes:
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* Jul 22, 2005: Created (Jorrit N. Herder)
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <minix/config.h>
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#include <minix/com.h>
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#include <minix/const.h>
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#include <minix/type.h>
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#include <minix/ipc.h>
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#include <minix/syslib.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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/* This array defines all known requests. */
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PRIVATE char *known_requests[] = {
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"up",
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"down",
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"refresh",
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"rescue",
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"shutdown",
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"catch for illegal requests"
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};
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#define ILLEGAL_REQUEST sizeof(known_requests)/sizeof(char *)
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/* Global error number set for failed system calls. */
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#define OK 0
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extern int errno;
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/* Define names for arguments provided to this utility. The first few
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* arguments are required and have a known index. Thereafter, some optional
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* argument pairs like "-args arglist" follow.
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*/
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#define ARG_NAME 0 /* own application name */
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#define ARG_REQUEST 1 /* request to perform */
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#define ARG_PATH 2 /* rescue dir or system service */
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#define ARG_PID 2 /* pid of system service */
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#define MIN_ARG_COUNT 2 /* require an action */
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#define ARG_ARGS "-args" /* list of arguments to be passed */
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#define ARG_DEV "-dev" /* major device number for drivers */
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#define ARG_PRIV "-priv" /* required privileges */
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#define ARG_PERIOD "-period" /* heartbeat period in ticks */
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/* The function parse_arguments() verifies and parses the command line
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* parameters passed to this utility. Request parameters that are needed
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* are stored globally in the following variables:
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*/
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PRIVATE int req_type;
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PRIVATE int req_pid;
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PRIVATE char *req_path;
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PRIVATE char *req_args;
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PRIVATE int req_major;
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PRIVATE long req_period;
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PRIVATE char *req_priv;
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/* Buffer to build "/command arg1 arg2 ..." string to pass to RS server. */
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PRIVATE char command[4096];
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/* An error occurred. Report the problem, print the usage, and exit.
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*/
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PRIVATE void print_usage(char *app_name, char *problem)
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{
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printf("Warning, %s\n", problem);
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printf("Usage:\n");
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printf(" %s up <binary> [%s <args>] [%s <special>] [%s <ticks>]\n",
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app_name, ARG_ARGS, ARG_DEV, ARG_PERIOD);
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printf(" %s down <pid>\n", app_name);
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printf(" %s refresh <pid>\n", app_name);
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printf(" %s rescue <dir>\n", app_name);
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printf(" %s shutdown\n", app_name);
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printf("\n");
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}
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/* A request to the RS server failed. Report and exit.
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*/
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PRIVATE void failure(int num)
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{
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printf("Request to RS failed: %s (%d)\n", strerror(num), num);
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exit(num);
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}
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/* Parse and verify correctness of arguments. Report problem and exit if an
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* error is found. Store needed parameters in global variables.
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*/
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PRIVATE int parse_arguments(int argc, char **argv)
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{
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struct stat stat_buf;
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char *hz;
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int req_nr;
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int i;
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/* Verify argument count. */
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if (argc < MIN_ARG_COUNT) {
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print_usage(argv[ARG_NAME], "wrong number of arguments");
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exit(EINVAL);
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}
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/* Verify request type. */
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for (req_type=0; req_type< ILLEGAL_REQUEST; req_type++) {
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if (strcmp(known_requests[req_type],argv[ARG_REQUEST])==0) break;
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}
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if (req_type == ILLEGAL_REQUEST) {
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print_usage(argv[ARG_NAME], "illegal request type");
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exit(ENOSYS);
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}
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req_nr = RS_RQ_BASE + req_type;
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if (req_nr == RS_UP) {
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/* Verify argument count. */
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if (argc - 1 < ARG_PATH) {
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print_usage(argv[ARG_NAME], "action requires a binary to start");
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exit(EINVAL);
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}
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/* Verify the name of the binary of the system service. */
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req_path = argv[ARG_PATH];
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if (req_path[0] != '/') {
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print_usage(argv[ARG_NAME], "binary should be absolute path");
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exit(EINVAL);
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}
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if (stat(req_path, &stat_buf) == -1) {
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perror(req_path);
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fprintf(stderr, "couldn't get stat binary\n");
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exit(errno);
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}
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if (! (stat_buf.st_mode & S_IFREG)) {
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print_usage(argv[ARG_NAME], "binary is not a regular file");
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exit(EINVAL);
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}
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/* Check optional arguments that come in pairs like "-args arglist". */
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for (i=MIN_ARG_COUNT+1; i<argc; i=i+2) {
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if (! (i+1 < argc)) {
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print_usage(argv[ARG_NAME], "optional argument not complete");
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exit(EINVAL);
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}
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if (strcmp(argv[i], ARG_ARGS)==0) {
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req_args = argv[i+1];
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}
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else if (strcmp(argv[i], ARG_PERIOD)==0) {
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req_period = strtol(argv[i+1], &hz, 10);
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if (strcmp(hz,"HZ")==0) req_period *= HZ;
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if (req_period < 1) {
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print_usage(argv[ARG_NAME], "period is at least be one tick");
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exit(EINVAL);
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}
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}
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else if (strcmp(argv[i], ARG_DEV)==0) {
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if (stat(argv[i+1], &stat_buf) == -1) {
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print_usage(argv[ARG_NAME], "couldn't get status of device");
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exit(errno);
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}
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if ( ! (stat_buf.st_mode & (S_IFBLK | S_IFCHR))) {
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print_usage(argv[ARG_NAME], "special file is not a device");
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exit(EINVAL);
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}
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req_major = (stat_buf.st_rdev >> MAJOR) & BYTE;
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}
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else if (strcmp(argv[i], ARG_ARGS)==0) {
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req_priv = argv[i+1];
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}
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else {
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print_usage(argv[ARG_NAME], "unknown optional argument given");
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exit(EINVAL);
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}
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}
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}
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else if (req_nr == RS_DOWN || req_nr == RS_REFRESH) {
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/* Verify argument count. */
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if (argc - 1 < ARG_PID) {
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print_usage(argv[ARG_NAME], "action requires a pid to stop");
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exit(EINVAL);
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}
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if (! (req_pid = atoi(argv[ARG_PID])) > 0) {
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print_usage(argv[ARG_NAME], "pid must be greater than zero");
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exit(EINVAL);
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}
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}
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else if (req_nr == RS_RESCUE) {
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/* Verify argument count. */
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if (argc - 1 < ARG_PATH) {
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print_usage(argv[ARG_NAME], "action requires rescue directory");
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exit(EINVAL);
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}
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req_path = argv[ARG_PATH];
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if (req_path[0] != '/') {
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print_usage(argv[ARG_NAME], "rescue dir should be absolute path");
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exit(EINVAL);
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}
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if (stat(argv[ARG_PATH], &stat_buf) == -1) {
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print_usage(argv[ARG_NAME], "couldn't get status of directory");
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exit(errno);
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}
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if ( ! (stat_buf.st_mode & S_IFDIR)) {
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print_usage(argv[ARG_NAME], "file is not a directory");
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exit(EINVAL);
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}
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}
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else if (req_nr == RS_SHUTDOWN) {
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/* no extra arguments required */
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}
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/* Return the request number if no error were found. */
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return(req_nr);
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}
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/* Main program.
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*/
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PUBLIC int main(int argc, char **argv)
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{
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message m;
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int result;
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int request;
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int s;
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/* Verify and parse the command line arguments. All arguments are checked
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* here. If an error occurs, the problem is reported and exit(2) is called.
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* all needed parameters to perform the request are extracted and stored
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* global variables.
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*/
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request = parse_arguments(argc, argv);
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/* Arguments seem fine. Try to perform the request. Only valid requests
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* should end up here. The default is used for not yet supported requests.
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*/
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switch(request) {
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case RS_UP:
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/* Build space-separated command string to be passed to RS server. */
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strcpy(command, req_path);
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command[strlen(req_path)] = ' ';
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strcpy(command+strlen(req_path)+1, req_args);
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/* Build request message and send the request. */
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m.RS_CMD_ADDR = command;
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m.RS_CMD_LEN = strlen(command);
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m.RS_DEV_MAJOR = req_major;
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m.RS_PERIOD = req_period;
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if (OK != (s=_taskcall(RS_PROC_NR, request, &m)))
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failure(s);
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result = m.m_type;
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break;
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case RS_DOWN:
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case RS_REFRESH:
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m.RS_PID = req_pid;
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if (OK != (s=_taskcall(RS_PROC_NR, request, &m)))
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failure(s);
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break;
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case RS_RESCUE:
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m.RS_CMD_ADDR = req_path;
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m.RS_CMD_LEN = strlen(req_path);
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if (OK != (s=_taskcall(RS_PROC_NR, request, &m)))
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failure(s);
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break;
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case RS_SHUTDOWN:
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if (OK != (s=_taskcall(RS_PROC_NR, request, &m)))
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failure(s);
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break;
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default:
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print_usage(argv[ARG_NAME], "request is not yet supported");
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result = EGENERIC;
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}
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return(result);
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}
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