mirror of
https://github.com/monitoring-plugins/monitoring-plugins.git
synced 2026-05-28 04:35:40 -04:00
runcmd.c: clang-format
This commit is contained in:
Lorenz Kästle
parent
c7691ddf4b
commit
629571aac3
1 changed files with 121 additions and 129 deletions
250
plugins/runcmd.c
250
plugins/runcmd.c
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@ -1,63 +1,63 @@
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/*****************************************************************************
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*
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* Monitoring run command utilities
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*
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* License: GPL
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* Copyright (c) 2005-2006 Monitoring Plugins Development Team
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*
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* Description :
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*
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* A simple interface to executing programs from other programs, using an
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* optimized and safe popen()-like implementation. It is considered safe
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* in that no shell needs to be spawned and the environment passed to the
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* execve()'d program is essentially empty.
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*
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* The code in this file is a derivative of popen.c which in turn was taken
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* from "Advanced Programming for the Unix Environment" by W. Richard Stevens.
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*
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* Care has been taken to make sure the functions are async-safe. The one
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* function which isn't is np_runcmd_init() which it doesn't make sense to
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* call twice anyway, so the api as a whole should be considered async-safe.
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*
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*
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*****************************************************************************/
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*
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* Monitoring run command utilities
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*
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* License: GPL
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* Copyright (c) 2005-2006 Monitoring Plugins Development Team
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*
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* Description :
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*
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* A simple interface to executing programs from other programs, using an
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* optimized and safe popen()-like implementation. It is considered safe
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* in that no shell needs to be spawned and the environment passed to the
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* execve()'d program is essentially empty.
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*
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* The code in this file is a derivative of popen.c which in turn was taken
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* from "Advanced Programming for the Unix Environment" by W. Richard Stevens.
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*
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* Care has been taken to make sure the functions are async-safe. The one
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* function which isn't is np_runcmd_init() which it doesn't make sense to
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* call twice anyway, so the api as a whole should be considered async-safe.
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*
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*
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*****************************************************************************/
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#define NAGIOSPLUG_API_C 1
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/** includes **/
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#include "runcmd.h"
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#ifdef HAVE_SYS_WAIT_H
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# include <sys/wait.h>
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# include <sys/wait.h>
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#endif
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#include "./utils.h"
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/** macros **/
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#ifndef WEXITSTATUS
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# define WEXITSTATUS(stat_val) ((unsigned)(stat_val) >> 8)
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# define WEXITSTATUS(stat_val) ((unsigned)(stat_val) >> 8)
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#endif
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#ifndef WIFEXITED
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# define WIFEXITED(stat_val) (((stat_val) & 255) == 0)
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# define WIFEXITED(stat_val) (((stat_val)&255) == 0)
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#endif
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/* 4.3BSD Reno <signal.h> doesn't define SIG_ERR */
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#if defined(SIG_IGN) && !defined(SIG_ERR)
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# define SIG_ERR ((Sigfunc *)-1)
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# define SIG_ERR ((Sigfunc *)-1)
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#endif
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#include "../lib/maxfd.h"
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@ -72,33 +72,26 @@
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static pid_t *np_pids = NULL;
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/** prototypes **/
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static int np_runcmd_open(const char *, int *, int *)
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__attribute__((__nonnull__(1, 2, 3)));
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static int np_runcmd_open(const char *, int *, int *) __attribute__((__nonnull__(1, 2, 3)));
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static int np_fetch_output(int, output *, int)
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__attribute__((__nonnull__(2)));
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static int np_fetch_output(int, output *, int) __attribute__((__nonnull__(2)));
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static int np_runcmd_close(int);
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/* prototype imported from utils.h */
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extern void die (int, const char *, ...)
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__attribute__((__noreturn__,__format__(__printf__, 2, 3)));
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extern void die(int, const char *, ...) __attribute__((__noreturn__, __format__(__printf__, 2, 3)));
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/* this function is NOT async-safe. It is exported so multithreaded
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* plugins (or other apps) can call it prior to running any commands
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* through this api and thus achieve async-safeness throughout the api */
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void np_runcmd_init(void)
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{
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long maxfd = mp_open_max();
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if(!np_pids) np_pids = calloc(maxfd, sizeof(pid_t));
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void np_runcmd_init(void) {
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long maxfd = mp_open_max();
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if (!np_pids)
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np_pids = calloc(maxfd, sizeof(pid_t));
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}
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/* Start running a command */
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static int
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np_runcmd_open(const char *cmdstring, int *pfd, int *pfderr)
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{
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static int np_runcmd_open(const char *cmdstring, int *pfd, int *pfderr) {
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char *env[2];
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char *cmd = NULL;
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char **argv = NULL;
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@ -112,7 +105,8 @@ np_runcmd_open(const char *cmdstring, int *pfd, int *pfderr)
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int i = 0;
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if(!np_pids) NP_RUNCMD_INIT;
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if (!np_pids)
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NP_RUNCMD_INIT;
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env[0] = strdup("LC_ALL=C");
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env[1] = NULL;
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@ -120,15 +114,17 @@ np_runcmd_open(const char *cmdstring, int *pfd, int *pfderr)
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/* make copy of command string so strtok() doesn't silently modify it */
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/* (the calling program may want to access it later) */
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cmdlen = strlen(cmdstring);
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if((cmd = malloc(cmdlen + 1)) == NULL) return -1;
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if ((cmd = malloc(cmdlen + 1)) == NULL)
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return -1;
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memcpy(cmd, cmdstring, cmdlen);
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cmd[cmdlen] = '\0';
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/* This is not a shell, so we don't handle "???" */
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if (strstr (cmdstring, "\"")) return -1;
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if (strstr(cmdstring, "\""))
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return -1;
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/* allow single quotes, but only if non-whitesapce doesn't occur on both sides */
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if (strstr (cmdstring, " ' ") || strstr (cmdstring, "'''"))
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if (strstr(cmdstring, " ' ") || strstr(cmdstring, "'''"))
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return -1;
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/* each arg must be whitespace-separated, so args can be a maximum
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@ -137,32 +133,31 @@ np_runcmd_open(const char *cmdstring, int *pfd, int *pfderr)
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argv = calloc(sizeof(char *), argc);
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if (argv == NULL) {
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printf ("%s\n", _("Could not malloc argv array in popen()"));
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printf("%s\n", _("Could not malloc argv array in popen()"));
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return -1;
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}
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/* get command arguments (stupidly, but fairly quickly) */
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while (cmd) {
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str = cmd;
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str += strspn (str, " \t\r\n"); /* trim any leading whitespace */
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str += strspn(str, " \t\r\n"); /* trim any leading whitespace */
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if (strstr (str, "'") == str) { /* handle SIMPLE quoted strings */
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if (strstr(str, "'") == str) { /* handle SIMPLE quoted strings */
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str++;
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if (!strstr (str, "'")) return -1; /* balanced? */
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cmd = 1 + strstr (str, "'");
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str[strcspn (str, "'")] = 0;
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}
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else {
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if (strpbrk (str, " \t\r\n")) {
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cmd = 1 + strpbrk (str, " \t\r\n");
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str[strcspn (str, " \t\r\n")] = 0;
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}
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else {
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if (!strstr(str, "'"))
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return -1; /* balanced? */
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cmd = 1 + strstr(str, "'");
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str[strcspn(str, "'")] = 0;
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} else {
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if (strpbrk(str, " \t\r\n")) {
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cmd = 1 + strpbrk(str, " \t\r\n");
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str[strcspn(str, " \t\r\n")] = 0;
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} else {
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cmd = NULL;
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}
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}
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if (cmd && strlen (cmd) == strspn (cmd, " \t\r\n"))
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if (cmd && strlen(cmd) == strspn(cmd, " \t\r\n"))
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cmd = NULL;
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argv[i++] = str;
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@ -173,33 +168,33 @@ np_runcmd_open(const char *cmdstring, int *pfd, int *pfderr)
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/* child runs exceve() and _exit. */
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if (pid == 0) {
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#ifdef RLIMIT_CORE
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#ifdef RLIMIT_CORE
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/* the program we execve shouldn't leave core files */
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getrlimit (RLIMIT_CORE, &limit);
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getrlimit(RLIMIT_CORE, &limit);
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limit.rlim_cur = 0;
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setrlimit (RLIMIT_CORE, &limit);
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setrlimit(RLIMIT_CORE, &limit);
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#endif
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close (pfd[0]);
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close(pfd[0]);
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if (pfd[1] != STDOUT_FILENO) {
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dup2 (pfd[1], STDOUT_FILENO);
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close (pfd[1]);
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dup2(pfd[1], STDOUT_FILENO);
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close(pfd[1]);
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}
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close (pfderr[0]);
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close(pfderr[0]);
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if (pfderr[1] != STDERR_FILENO) {
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dup2 (pfderr[1], STDERR_FILENO);
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close (pfderr[1]);
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dup2(pfderr[1], STDERR_FILENO);
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close(pfderr[1]);
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}
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/* close all descriptors in np_pids[]
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* This is executed in a separate address space (pure child),
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* so we don't have to worry about async safety */
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long maxfd = mp_open_max();
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long maxfd = mp_open_max();
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for (i = 0; i < maxfd; i++)
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if(np_pids[i] > 0)
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close (i);
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if (np_pids[i] > 0)
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close(i);
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execve (argv[0], argv, env);
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_exit (STATE_UNKNOWN);
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execve(argv[0], argv, env);
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_exit(STATE_UNKNOWN);
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}
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/* parent picks up execution here */
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@ -213,49 +208,44 @@ np_runcmd_open(const char *cmdstring, int *pfd, int *pfderr)
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return pfd[0];
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}
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static int
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np_runcmd_close(int fd)
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{
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static int np_runcmd_close(int fd) {
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int status;
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pid_t pid;
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/* make sure this fd was opened by popen() */
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long maxfd = mp_open_max();
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if(fd < 0 || fd > maxfd || !np_pids || (pid = np_pids[fd]) == 0)
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long maxfd = mp_open_max();
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if (fd < 0 || fd > maxfd || !np_pids || (pid = np_pids[fd]) == 0)
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return -1;
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np_pids[fd] = 0;
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if (close (fd) == -1) return -1;
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if (close(fd) == -1)
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return -1;
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/* EINTR is ok (sort of), everything else is bad */
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while (waitpid (pid, &status, 0) < 0)
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if (errno != EINTR) return -1;
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while (waitpid(pid, &status, 0) < 0)
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if (errno != EINTR)
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return -1;
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/* return child's termination status */
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return (WIFEXITED(status)) ? WEXITSTATUS(status) : -1;
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}
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void
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runcmd_timeout_alarm_handler (int signo)
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{
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void runcmd_timeout_alarm_handler(int signo) {
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if (signo == SIGALRM)
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puts(_("CRITICAL - Plugin timed out while executing system call"));
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long maxfd = mp_open_max();
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if(np_pids) for(long int i = 0; i < maxfd; i++) {
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if(np_pids[i] != 0) kill(np_pids[i], SIGKILL);
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}
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long maxfd = mp_open_max();
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if (np_pids)
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for (long int i = 0; i < maxfd; i++) {
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if (np_pids[i] != 0)
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kill(np_pids[i], SIGKILL);
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}
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exit (STATE_CRITICAL);
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exit(STATE_CRITICAL);
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}
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static int
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np_fetch_output(int fd, output *op, int flags)
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{
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static int np_fetch_output(int fd, output *op, int flags) {
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size_t len = 0, i = 0, lineno = 0;
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size_t rsf = 6, ary_size = 0; /* rsf = right shift factor, dec'ed uncond once */
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char *buf = NULL;
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@ -264,7 +254,7 @@ np_fetch_output(int fd, output *op, int flags)
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op->buf = NULL;
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op->buflen = 0;
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while((ret = read(fd, tmpbuf, sizeof(tmpbuf))) > 0) {
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while ((ret = read(fd, tmpbuf, sizeof(tmpbuf))) > 0) {
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len = (size_t)ret;
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op->buf = realloc(op->buf, op->buflen + len + 1);
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memcpy(op->buf + op->buflen, tmpbuf, len);
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@ -272,33 +262,33 @@ np_fetch_output(int fd, output *op, int flags)
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i++;
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}
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if(ret < 0) {
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if (ret < 0) {
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printf("read() returned %d: %s\n", ret, strerror(errno));
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return ret;
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}
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/* some plugins may want to keep output unbroken, and some commands
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* will yield no output, so return here for those */
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if(flags & RUNCMD_NO_ARRAYS || !op->buf || !op->buflen)
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if (flags & RUNCMD_NO_ARRAYS || !op->buf || !op->buflen)
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return op->buflen;
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/* and some may want both */
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if(flags & RUNCMD_NO_ASSOC) {
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if (flags & RUNCMD_NO_ASSOC) {
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buf = malloc(op->buflen);
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memcpy(buf, op->buf, op->buflen);
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}
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else buf = op->buf;
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} else
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buf = op->buf;
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op->line = NULL;
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op->lens = NULL;
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i = 0;
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while(i < op->buflen) {
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while (i < op->buflen) {
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/* make sure we have enough memory */
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if(lineno >= ary_size) {
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if (lineno >= ary_size) {
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/* ary_size must never be zero */
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do {
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ary_size = op->buflen >> --rsf;
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} while(!ary_size);
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} while (!ary_size);
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op->line = realloc(op->line, ary_size * sizeof(char *));
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op->lens = realloc(op->lens, ary_size * sizeof(size_t));
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@ -308,7 +298,8 @@ np_fetch_output(int fd, output *op, int flags)
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op->line[lineno] = &buf[i];
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/* hop to next newline or end of buffer */
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while(buf[i] != '\n' && i < op->buflen) i++;
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while (buf[i] != '\n' && i < op->buflen)
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i++;
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buf[i] = '\0';
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/* calculate the string length using pointer difference */
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@ -321,21 +312,22 @@ np_fetch_output(int fd, output *op, int flags)
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return lineno;
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}
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int
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np_runcmd(const char *cmd, output *out, output *err, int flags)
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{
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int np_runcmd(const char *cmd, output *out, output *err, int flags) {
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int fd, pfd_out[2], pfd_err[2];
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/* initialize the structs */
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if(out) memset(out, 0, sizeof(output));
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if(err) memset(err, 0, sizeof(output));
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if (out)
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memset(out, 0, sizeof(output));
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if (err)
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memset(err, 0, sizeof(output));
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if((fd = np_runcmd_open(cmd, pfd_out, pfd_err)) == -1)
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die (STATE_UNKNOWN, _("Could not open pipe: %s\n"), cmd);
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if ((fd = np_runcmd_open(cmd, pfd_out, pfd_err)) == -1)
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die(STATE_UNKNOWN, _("Could not open pipe: %s\n"), cmd);
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if(out) out->lines = np_fetch_output(pfd_out[0], out, flags);
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if(err) err->lines = np_fetch_output(pfd_err[0], err, flags);
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if (out)
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out->lines = np_fetch_output(pfd_out[0], out, flags);
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if (err)
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err->lines = np_fetch_output(pfd_err[0], err, flags);
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return np_runcmd_close(fd);
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}
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