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4c301d47dd
The default sysfs path is always set to '/sys' unless the SYSFS_ROOT environment variable is defined. To address security concerns, secure_getenv() is used within util_path_sysfs() to protect against malicious values in SYSFS_ROOT. Additionally, constructing the sysfs path dynamically in an allocated buffer, rather than using a fixed-size buffer, helps prevent potential buffer overflows. These modifications also significantly improve testability by allowing sysfs read operations to be redirected to an alternative file path, which enables testing without affecting the active system state. Signed-off-by: Jan Polensky <japo@linux.ibm.com> Reviewed-by: Jan Höppner <hoeppner@linux.ibm.com> Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
134 lines
3.0 KiB
C
134 lines
3.0 KiB
C
/*
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* ipl_tools - Linux for System z reipl and shutdown tools
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*
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* Command: lsshut
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*
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* Copyright IBM Corp. 2008, 2017
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*
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* s390-tools is free software; you can redistribute it and/or modify
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* it under the terms of the MIT license. See LICENSE for details.
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*/
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#include "lib/util_path.h"
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#include "ipl_tools.h"
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static const char *const usage_lsshut =
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"Usage: %s [OPTIONS]\n"
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"\n"
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"Print the shutdown action configuration for Linux on System z.\n"
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"\n"
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"OPTIONS:\n"
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" -h, --help Print this help, then exit\n"
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" -v, --version Print version information, then exit\n";
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static __noreturn void print_usage_lsshut_exit(void)
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{
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printf(usage_lsshut, g.prog_name);
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exit(0);
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}
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static void parse_lsshut_options(int argc, char *argv[])
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{
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int opt, idx;
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const struct option long_opts[] = {
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{ "help", no_argument, NULL, 'h' },
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{ "version", no_argument, NULL, 'v' },
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{ NULL, 0, NULL, 0 }
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};
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while ((opt = getopt_long(argc, argv, "hv", long_opts, &idx)) != -1) {
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switch (opt) {
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case 'h':
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print_usage_lsshut_exit();
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case 'v':
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print_version_exit();
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default:
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print_help_hint_exit();
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}
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}
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/* don't run with too many arguments */
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if (optind != argc)
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ERR_EXIT("Invalid positional parameter \"%s\" specified",
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argv[optind]);
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}
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/*
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* VMCMDs can have up to 128 characters. Newlines mark the end of a CP command.
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* Therefore we can have up to 64 single CP commands (with one character).
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* With quotes (2) and commas (1) we can have at most 4 * 64 = 256 characters
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* for the output string.
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*/
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static void read_vmcmd(char *str, const char *path)
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{
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char buf[128], tmp[512];
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char *ptr_old, *ptr;
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*str = 0;
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ptr_old = ptr = buf;
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read_fw_str(buf, path, sizeof(buf));
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while ((ptr = strchr(ptr_old, '\n'))) {
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*ptr = 0;
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sprintf(tmp, "\"%s\",", ptr_old);
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strcat(str, tmp);
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ptr_old = ptr + 1;
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}
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sprintf(tmp, "\"%s\"", ptr_old);
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strcat(str, tmp);
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}
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static void print_kdump(void)
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{
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struct stat sb;
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char tmp[1024];
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char *path;
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path = util_path_sysfs("kernel/kexec_crash_loaded");
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if (stat(path, &sb) != 0) {
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free(path);
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return;
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}
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read_str(tmp, path, sizeof(tmp));
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if (strncmp(tmp, "1", 1) == 0)
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printf("kdump,");
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free(path);
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}
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static void shutdown_trigger_print(struct shutdown_trigger *trigger)
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{
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char tmp[1024], cmd[1024], path[PATH_MAX];
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sprintf(path, "shutdown_actions/%s", trigger->name_sysfs);
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printf("%-16s ", trigger->name_print);
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if ((trigger == &shutdown_trigger_panic ||
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trigger == &shutdown_trigger_restart))
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print_kdump();
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read_fw_str(tmp, path, sizeof(tmp));
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if (strncmp(tmp, "vmcmd", strlen("vmcmd")) == 0) {
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sprintf(path, "vmcmd/%s", trigger->name_sysfs);
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read_vmcmd(cmd, path);
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printf("vmcmd (%s)\n", cmd);
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} else {
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printf("%s\n", tmp);
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}
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}
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void cmd_lsshut(int argc, char *argv[])
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{
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int i;
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parse_lsshut_options(argc, argv);
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shutdown_init();
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printf("Trigger Action\n");
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printf("========================\n");
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for (i = 0; shutdown_trigger_vec[i]; i++) {
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if (!shutdown_trigger_vec[i]->available)
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continue;
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shutdown_trigger_print(shutdown_trigger_vec[i]);
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}
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}
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