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monitoring-plugins/plugins/check_snmp.c
Ethan Galstad 44a321cb8a Initial revision 
git-svn-id: https://nagiosplug.svn.sourceforge.net/svnroot/nagiosplug/nagiosplug/trunk@2 f882894a-f735-0410-b71e-b25c423dba1c
2002-02-28 06:42:51 +00:00

805 lines
22 KiB
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/******************************************************************************
*
* CHECK_SNMP.C
*
* Program: SNMP plugin for Nagios
* License: GPL
* Copyright (c) 1999 Ethan Galstad (nagios@nagios.org)
*
* Last Modified: $Date$
*
* Description:
*
* This plugin uses the 'snmpget' command included with the UCD-SNMP
* package. If you don't have the package installed you will need to
* download it from http://ucd-snmp.ucdavis.edu before you can use
* this plugin.
*
* License Information:
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*./plugins/check_snmp 127.0.0.1 -c public -o .1.3.6.1.4.1.2021.9.1.2.1
*****************************************************************************/
#include "common.h"
#include "utils.h"
#include "popen.h"
#define PROGNAME check_snmp
#define mark(a) ((a)!=0?"*":"")
#define CHECK_UNDEF 0
#define CRIT_PRESENT 1
#define CRIT_STRING 2
#define CRIT_REGEX 4
#define CRIT_GT 8
#define CRIT_LT 16
#define CRIT_GE 32
#define CRIT_LE 64
#define CRIT_EQ 128
#define CRIT_NE 256
#define CRIT_RANGE 512
#define WARN_PRESENT 1024
#define WARN_STRING 2048
#define WARN_REGEX 4096
#define WARN_GT 8192
#define WARN_LT 16384
#define WARN_GE 32768
#define WARN_LE 65536
#define WARN_EQ 131072
#define WARN_NE 262144
#define WARN_RANGE 524288
#define MAX_OIDS 8
#define MAX_DELIM_LENGTH 8
#define DEFAULT_DELIMITER "="
#define DEFAULT_OUTPUT_DELIMITER " "
void print_usage (void);
void print_help (char *);
int process_arguments (int, char **);
int call_getopt (int, char **);
int check_num (int);
char *clarify_message (char *);
int lu_getll (unsigned long *, char *);
int lu_getul (unsigned long *, char *);
char *thisarg (char *str);
char *nextarg (char *str);
#ifdef HAVE_REGEX_H
#include <regex.h>
char regex_expect[MAX_INPUT_BUFFER] = "";
regex_t preg;
regmatch_t pmatch[10];
char timestamp[10] = "";
char regex[MAX_INPUT_BUFFER];
char errbuf[MAX_INPUT_BUFFER];
int cflags = REG_EXTENDED | REG_NOSUB | REG_NEWLINE;
int eflags = 0;
int errcode, excode;
#endif
char *server_address = NULL;
char *community = NULL;
char oid[MAX_INPUT_BUFFER] = "";
char *label = NULL;
char *units = NULL;
char string_value[MAX_INPUT_BUFFER] = "";
char **labels = NULL;
char **unitv = NULL;
int nlabels = 0;
int labels_size = 8;
int nunits = 0;
int unitv_size = 8;
unsigned long lower_warn_lim[MAX_OIDS];
unsigned long upper_warn_lim[MAX_OIDS];
unsigned long lower_crit_lim[MAX_OIDS];
unsigned long upper_crit_lim[MAX_OIDS];
unsigned long response_value[MAX_OIDS];
int check_warning_value = FALSE;
int check_critical_value = FALSE;
int eval_method[MAX_OIDS];
char *delimiter = NULL;
char *output_delim = NULL;
int
main (int argc, char **argv)
{
int i = 0;
int iresult = STATE_UNKNOWN;
int found = 0;
int result = STATE_DEPENDENT;
char input_buffer[MAX_INPUT_BUFFER];
char *command_line = NULL;
char *response = NULL;
char *outbuff = NULL;
char *output = NULL;
char *ptr = NULL;
char *p2 = NULL;
char *show = NULL;
labels = malloc (labels_size);
unitv = malloc (unitv_size);
outbuff = strscpy (outbuff, "");
for (i = 0; i < MAX_OIDS; i++)
eval_method[i] = CHECK_UNDEF;
i = 0;
if (process_arguments (argc, argv) == ERROR)
usage ("Incorrect arguments supplied\n");
/* create the command line to execute */
command_line = ssprintf
(command_line,
"%s -m ALL -v 1 %s %s %s",
PATH_TO_SNMPGET, server_address, community, oid);
/* run the command */
child_process = spopen (command_line);
if (child_process == NULL) {
printf ("Could not open pipe: %s\n", command_line);
exit (STATE_UNKNOWN);
}
child_stderr = fdopen (child_stderr_array[fileno (child_process)], "r");
if (child_stderr == NULL) {
printf ("Could not open stderr for %s\n", command_line);
}
while (fgets (input_buffer, MAX_INPUT_BUFFER - 1, child_process))
output = strscat (output, input_buffer);
ptr = output;
while (ptr) {
ptr = strstr (ptr, delimiter);
if (ptr == NULL)
break;
ptr += strlen (delimiter);
ptr += strspn (ptr, " ");
found++;
if (ptr[0] == '"') {
ptr++;
response = strpcpy (response, ptr, "\"");
ptr = strpbrk (ptr, "\"");
ptr += strspn (ptr, "\"\n");
}
else {
response = strpcpy (response, ptr, "\n");
ptr = strpbrk (ptr, "\n");
ptr += strspn (ptr, "\n");
while
(strstr (ptr, delimiter) &&
strstr (ptr, "\n") && strstr (ptr, "\n") < strstr (ptr, delimiter)) {
response = strpcat (response, ptr, "\n");
ptr = strpbrk (ptr, "\n");
}
if (ptr && strstr (ptr, delimiter) == NULL) {
response = strscat (response, ptr);
ptr = NULL;
}
}
if (strstr (response, "Gauge: "))
show = strstr (response, "Gauge: ") + 7;
else if (strstr (response, "Gauge32: "))
show = strstr (response, "Gauge32: ") + 9;
else
show = response;
p2 = show;
if (eval_method[i] & CRIT_GT ||
eval_method[i] & CRIT_LT ||
eval_method[i] & CRIT_GE ||
eval_method[i] & CRIT_LE ||
eval_method[i] & CRIT_EQ ||
eval_method[i] & CRIT_NE ||
eval_method[i] & WARN_GT ||
eval_method[i] & WARN_LT ||
eval_method[i] & WARN_GE ||
eval_method[i] & WARN_LE ||
eval_method[i] & WARN_EQ || eval_method[i] & WARN_NE) {
p2 = strpbrk (p2, "0123456789");
response_value[i] = strtoul (p2, NULL, 10);
iresult = check_num (i);
show = ssprintf (show, "%d", response_value[i]);
}
else if (eval_method[i] & CRIT_STRING) {
if (strcmp (response, string_value))
iresult = STATE_CRITICAL;
else
iresult = STATE_OK;
}
else if (eval_method[i] & CRIT_REGEX) {
#ifdef HAVE_REGEX_H
excode = regexec (&preg, response, 10, pmatch, eflags);
if (excode == 0) {
iresult = STATE_OK;
}
else if (excode != REG_NOMATCH) {
regerror (excode, &preg, errbuf, MAX_INPUT_BUFFER);
printf ("Execute Error: %s\n", errbuf);
exit (STATE_CRITICAL);
}
else {
iresult = STATE_CRITICAL;
}
#else
printf ("SNMP UNKNOWN: call for regex which was not a compiled option");
exit (STATE_UNKNOWN);
#endif
}
else {
if (response)
iresult = STATE_OK;
else if (eval_method[i] & CRIT_PRESENT)
iresult = STATE_CRITICAL;
else
iresult = STATE_WARNING;
}
result = max (result, iresult);
if (nlabels > 1 && i < nlabels && labels[i] != NULL)
outbuff = ssprintf
(outbuff,
"%s%s%s %s%s%s",
outbuff,
(i == 0) ? " " : output_delim,
labels[i], mark (iresult), show, mark (iresult));
else
outbuff = ssprintf
(outbuff,
"%s%s%s%s%s",
outbuff,
(i == 0) ? " " : output_delim, mark (iresult), show, mark (iresult));
if (nunits > 0 && i < nunits)
outbuff = ssprintf (outbuff, "%s %s", outbuff, unitv[i]);
i++;
} /* end while */
if (found == 0)
terminate
(STATE_UNKNOWN,
"%s problem - No data recieved from host\nCMD: %s\n",
label, command_line);
/* WARNING if output found on stderr */
if (fgets (input_buffer, MAX_INPUT_BUFFER - 1, child_stderr))
result = max (result, STATE_WARNING);
/* close stderr */
(void) fclose (child_stderr);
/* close the pipe */
if (spclose (child_process))
result = max (result, STATE_WARNING);
if (nunits > 0)
printf ("%s %s -%s\n", label, state_text (result), outbuff);
else
printf ("%s %s -%s %s\n", label, state_text (result), outbuff, units);
return result;
}
/* process command-line arguments */
int
process_arguments (int argc, char **argv)
{
int c;
if (argc < 2)
return ERROR;
for (c = 1; c < argc; c++) {
if (strcmp ("-to", argv[c]) == 0)
strcpy (argv[c], "-t");
if (strcmp ("-wv", argv[c]) == 0)
strcpy (argv[c], "-w");
if (strcmp ("-cv", argv[c]) == 0)
strcpy (argv[c], "-c");
}
c = 0;
while (c += (call_getopt (argc - c, &argv[c]))) {
if (argc <= c)
break;
if (server_address == NULL)
server_address = strscpy (NULL, argv[c]);
}
if (community == NULL)
community = strscpy (NULL, "public");
if (delimiter == NULL)
delimiter = strscpy (NULL, DEFAULT_DELIMITER);
if (output_delim == NULL)
output_delim = strscpy (NULL, DEFAULT_OUTPUT_DELIMITER);
if (label == NULL)
label = strscpy (NULL, "SNMP");
if (units == NULL)
units = strscpy (NULL, "");
return c;
}
int
call_getopt (int argc, char **argv)
{
char *ptr;
int c, i = 1;
int j = 0, jj = 0;
#ifdef HAVE_GETOPT_H
int option_index = 0;
static struct option long_options[] = {
{"help", no_argument, 0, 'h'},
{"version", no_argument, 0, 'V'},
{"timeout", required_argument, 0, 't'},
{"critical", required_argument, 0, 'c'},
{"warning", required_argument, 0, 'w'},
{"hostname", required_argument, 0, 'H'},
{"community", required_argument, 0, 'C'},
{"oid", required_argument, 0, 'o'},
{"object", required_argument, 0, 'o'},
{"delimiter", required_argument, 0, 'd'},
{"output-delimiter", required_argument, 0, 'D'},
{"string", required_argument, 0, 's'},
{"regex", required_argument, 0, 'r'},
{"ereg", required_argument, 0, 'r'},
{"eregi", required_argument, 0, 'R'},
{"label", required_argument, 0, 'l'},
{"units", required_argument, 0, 'u'},
{0, 0, 0, 0}
};
#endif
while (1) {
#ifdef HAVE_GETOPT_H
c =
getopt_long (argc, argv, "+?hVt:c:w:H:C:o:d:D:s:R:r:l:u:",
long_options, &option_index);
#else
c = getopt (argc, argv, "+?hVt:c:w:H:C:o:d:D:s:R:r:l:u:");
#endif
if (c == -1 || c == EOF)
break;
i++;
switch (c) {
case 't':
case 'c':
case 'w':
case 'H':
case 'C':
case 'o':
case 'd':
case 'D':
case 's':
case 'R':
case 'r':
case 'l':
case 'u':
i++;
}
switch (c) {
case '?': /* help */
printf ("%s: Unknown argument: %s\n\n", my_basename (argv[0]), optarg);
print_usage ();
exit (STATE_UNKNOWN);
case 'h': /* help */
print_help (my_basename (argv[0]));
exit (STATE_OK);
case 'V': /* version */
print_revision (my_basename (argv[0]), "$Revision$");
exit (STATE_OK);
case 't': /* timeout period */
if (!is_integer (optarg)) {
printf ("%s: Timeout Interval must be an integer!\n\n",
my_basename (argv[0]));
print_usage ();
exit (STATE_UNKNOWN);
}
timeout_interval = atoi (optarg);
break;
case 'c': /* critical time threshold */
if (strspn (optarg, "0123456789:,") < strlen (optarg)) {
printf ("Invalid critical threshold: %s\n", optarg);
print_usage ();
exit (STATE_UNKNOWN);
}
for (ptr = optarg, jj = 0; ptr && jj < MAX_OIDS; jj++) {
if (lu_getll (&lower_crit_lim[jj], ptr) == 1)
eval_method[jj] |= CRIT_LT;
if (lu_getul (&upper_crit_lim[jj], ptr) == 1)
eval_method[jj] |= CRIT_GT;
(ptr = index (ptr, ',')) ? ptr++ : ptr;
}
break;
case 'w': /* warning time threshold */
if (strspn (optarg, "0123456789:,") < strlen (optarg)) {
printf ("Invalid warning threshold: %s\n", optarg);
print_usage ();
exit (STATE_UNKNOWN);
}
for (ptr = optarg, jj = 0; ptr && jj < MAX_OIDS; jj++) {
if (lu_getll (&lower_warn_lim[jj], ptr) == 1)
eval_method[jj] |= WARN_LT;
if (lu_getul (&upper_warn_lim[jj], ptr) == 1)
eval_method[jj] |= WARN_GT;
(ptr = index (ptr, ',')) ? ptr++ : ptr;
}
break;
case 'H': /* Host or server */
server_address = strscpy (server_address, optarg);
break;
case 'C': /* group or community */
community = strscpy (community, optarg);
break;
case 'o': /* object identifier */
for (ptr = optarg; (ptr = index (ptr, ',')); ptr++)
ptr[0] = ' ';
strncpy (oid, optarg, sizeof (oid) - 1);
oid[sizeof (oid) - 1] = 0;
for (ptr = optarg, j = 1; (ptr = index (ptr, ' ')); ptr++)
j++;
break;
case 'd': /* delimiter */
delimiter = strscpy (delimiter, optarg);
break;
case 'D': /* output-delimiter */
output_delim = strscpy (output_delim, optarg);
break;
case 's': /* string or substring */
strncpy (string_value, optarg, sizeof (string_value) - 1);
string_value[sizeof (string_value) - 1] = 0;
eval_method[jj++] = CRIT_STRING;
break;
case 'R': /* regex */
#ifdef HAVE_REGEX_H
cflags = REG_ICASE;
#endif
case 'r': /* regex */
#ifdef HAVE_REGEX_H
cflags |= REG_EXTENDED | REG_NOSUB | REG_NEWLINE;
strncpy (regex_expect, optarg, sizeof (regex_expect) - 1);
regex_expect[sizeof (regex_expect) - 1] = 0;
errcode = regcomp (&preg, regex_expect, cflags);
if (errcode != 0) {
regerror (errcode, &preg, errbuf, MAX_INPUT_BUFFER);
printf ("Could Not Compile Regular Expression");
return ERROR;
}
eval_method[jj++] = CRIT_REGEX;
#else
printf ("SNMP UNKNOWN: call for regex which was not a compiled option");
exit (STATE_UNKNOWN);
#endif
break;
case 'l': /* label */
label = optarg;
nlabels++;
if (nlabels >= labels_size) {
labels_size += 8;
labels = realloc (labels, labels_size);
if (labels == NULL)
terminate (STATE_UNKNOWN,
"Could not realloc() labels[%d]", nlabels);
}
labels[nlabels - 1] = optarg;
ptr = thisarg (optarg);
if (strstr (ptr, "'") == ptr)
labels[nlabels - 1] = ptr + 1;
else
labels[nlabels - 1] = ptr;
while (ptr && (ptr = nextarg (ptr))) {
if (nlabels >= labels_size) {
labels_size += 8;
labels = realloc (labels, labels_size);
if (labels == NULL)
terminate (STATE_UNKNOWN, "Could not realloc() labels\n");
}
labels++;
ptr = thisarg (ptr);
if (strstr (ptr, "'") == ptr)
labels[nlabels - 1] = ptr + 1;
else
labels[nlabels - 1] = ptr;
}
break;
case 'u': /* units */
units = optarg;
nunits++;
if (nunits >= unitv_size) {
unitv_size += 8;
unitv = realloc (unitv, unitv_size);
if (unitv == NULL)
terminate (STATE_UNKNOWN,
"Could not realloc() units [%d]\n", nunits);
}
unitv[nunits - 1] = optarg;
ptr = thisarg (optarg);
if (strstr (ptr, "'") == ptr)
unitv[nunits - 1] = ptr + 1;
else
unitv[nunits - 1] = ptr;
while (ptr && (ptr = nextarg (ptr))) {
if (nunits >= unitv_size) {
unitv_size += 8;
unitv = realloc (unitv, unitv_size);
if (units == NULL)
terminate (STATE_UNKNOWN, "Could not realloc() units\n");
}
nunits++;
ptr = thisarg (ptr);
if (strstr (ptr, "'") == ptr)
unitv[nunits - 1] = ptr + 1;
else
unitv[nunits - 1] = ptr;
}
break;
}
}
return i;
}
void
print_usage (void)
{
printf
("Usage: check_snmp -H <ip_address> -o <OID> [-w warn_range] [-c crit_range] \n"
" [-C community] [-s string] [-r regex] [-R regexi] [-t timeout]\n"
" [-l label] [-u units] [-d delimiter] [-D output-delimiter]\n"
" check_snmp --help\n" " check_snmp --version\n");
}
void
print_help (char *cmd)
{
printf ("Copyright (c) 1999 Ethan Galstad (nagios@nagios.org)\n"
"License: GPL\n\n");
print_usage ();
printf
("\nOptions:\n"
" -h, --help\n"
" Print detailed help screen\n"
" -V, --version\n"
" Print version information\n"
" -H, --hostname=HOST\n"
" Name or IP address of the device you wish to query\n"
" -o, --oid=OID(s)\n"
" Object identifier(s) whose value you wish to query\n"
" -w, --warning=INTEGER_RANGE(s)\n"
" Range(s) which will not result in a WARNING status\n"
" -c, --critical=INTEGER_RANGE(s)\n"
" Range(s) which will not result in a CRITICAL status\n"
" -C, --community=STRING\n"
" Optional community string for SNMP communication\n"
" (default is \"public\")\n"
" -u, --units=STRING\n"
" Units label(s) for output data (e.g., 'sec.').\n"
" -d, --delimiter=STRING\n"
" Delimiter to use when parsing returned data. Default is \"%s\"\n"
" Any data on the right hand side of the delimiter is considered\n"
" to be the data that should be used in the evaluation.\n"
" -t, --timeout=INTEGER\n"
" Seconds to wait before plugin times out (see also nagios server timeout)\n"
" -D, --output-delimiter=STRING\n"
" Separates output on multiple OID requests\n"
" -s, --string=STRING\n"
" Return OK state (for that OID) if STRING is an exact match\n"
" -r, --ereg=REGEX\n"
" Return OK state (for that OID) if extended regular expression REGEX matches\n"
" -R, --eregi=REGEX\n"
" Return OK state (for that OID) if case-insensitive extended REGEX matches\n"
" -l, --label=STRING\n"
" Prefix label for output from plugin (default -s 'SNMP')\n\n"
"- This plugin uses the 'snmpget' command included with the UCD-SNMP package.\n"
" If you don't have the package installed, you will need to download it from\n"
" http://ucd-snmp.ucdavis.edu before you can use this plugin.\n"
"- Multiple OIDs may be indicated by a comma- or space-delimited list (lists with\n"
" internal spaces must be quoted)\n"
"- Ranges are inclusive and are indicated with colons. When specified as\n"
" 'min:max' a STATE_OK will be returned if the result is within the indicated\n"
" range or is equal to the upper or lower bound. A non-OK state will be\n"
" returned if the result is outside the specified range.\n"
"- If spcified in the order 'max:min' a non-OK state will be returned if the\n"
" result is within the (inclusive) range.\n"
"- Upper or lower bounds may be omitted to skip checking the respective limit.\n"
"- Bare integers are interpreted as upper limits.\n"
"- When checking multiple OIDs, separate ranges by commas like '-w 1:10,1:,:20'\n"
"- Note that only one string and one regex may be checked at present\n"
"- All evaluation methods other than PR, STR, and SUBSTR expect that the value\n"
" returned from the SNMP query is an unsigned integer.\n\n",
DEFAULT_DELIMITER);
}
char *
clarify_message (char *msg)
{
int i = 0;
int foo;
char tmpmsg_c[MAX_INPUT_BUFFER];
char *tmpmsg = (char *) &tmpmsg_c;
tmpmsg = strcpy (tmpmsg, msg);
if (!strncmp (tmpmsg, " Hex:", 5)) {
tmpmsg = strtok (tmpmsg, ":");
while ((tmpmsg = strtok (NULL, " "))) {
foo = strtol (tmpmsg, NULL, 16);
/* Translate chars that are not the same value in the printers
* character set.
*/
switch (foo) {
case 208:
{
foo = 197;
break;
}
case 216:
{
foo = 196;
break;
}
}
msg[i] = foo;
i++;
}
msg[i] = 0;
}
return (msg);
}
int
check_num (int i)
{
int result;
result = STATE_OK;
if (eval_method[i] & WARN_GT && eval_method[i] & WARN_LT &&
lower_warn_lim[i] > upper_warn_lim[i]) {
if (response_value[i] <= lower_warn_lim[i] &&
response_value[i] >= upper_warn_lim[i]) {
result = STATE_WARNING;
}
}
else if
((eval_method[i] & WARN_GT && response_value[i] > upper_warn_lim[i]) ||
(eval_method[i] & WARN_GE && response_value[i] >= upper_warn_lim[i]) ||
(eval_method[i] & WARN_LT && response_value[i] < lower_warn_lim[i]) ||
(eval_method[i] & WARN_LE && response_value[i] <= lower_warn_lim[i]) ||
(eval_method[i] & WARN_EQ && response_value[i] == upper_warn_lim[i]) ||
(eval_method[i] & WARN_NE && response_value[i] != upper_warn_lim[i])) {
result = STATE_WARNING;
}
if (eval_method[i] & CRIT_GT && eval_method[i] & CRIT_LT &&
lower_warn_lim[i] > upper_warn_lim[i]) {
if (response_value[i] <= lower_crit_lim[i] &&
response_value[i] >= upper_crit_lim[i]) {
result = STATE_CRITICAL;
}
}
else if
((eval_method[i] & CRIT_GT && response_value[i] > upper_crit_lim[i]) ||
(eval_method[i] & CRIT_GE && response_value[i] >= upper_crit_lim[i]) ||
(eval_method[i] & CRIT_LT && response_value[i] < lower_crit_lim[i]) ||
(eval_method[i] & CRIT_LE && response_value[i] <= lower_crit_lim[i]) ||
(eval_method[i] & CRIT_EQ && response_value[i] == upper_crit_lim[i]) ||
(eval_method[i] & CRIT_NE && response_value[i] != upper_crit_lim[i])) {
result = STATE_CRITICAL;
}
return result;
}
int
lu_getll (unsigned long *ll, char *str)
{
char tmp[100];
if (strchr (str, ':') == NULL)
return 0;
if (strchr (str, ',') != NULL && (strchr (str, ',') < strchr (str, ':')))
return 0;
if (sscanf (str, "%lu%[:]", ll, tmp) == 2)
return 1;
return 0;
}
int
lu_getul (unsigned long *ul, char *str)
{
char tmp[100];
if (sscanf (str, "%lu%[^,]", ul, tmp) == 1)
return 1;
if (sscanf (str, ":%lu%[^,]", ul, tmp) == 1)
return 1;
if (sscanf (str, "%*u:%lu%[^,]", ul, tmp) == 1)
return 1;
return 0;
}
/* trim leading whitespace
if there is a leading quote, make sure it balances */
char *
thisarg (char *str)
{
str += strspn (str, " \t\r\n"); /* trim any leading whitespace */
if (strstr (str, "'") == str) { /* handle SIMPLE quoted strings */
if (strlen (str) == 1 || !strstr (str + 1, "'"))
terminate (STATE_UNKNOWN, "Unbalanced quotes\n");
}
return str;
}
/* if there's a leading quote, advance to the trailing quote
set the trailing quote to '\x0'
if the string continues, advance beyond the comma */
char *
nextarg (char *str)
{
if (strstr (str, "'") == str) {
if (strlen (str) > 1) {
str = strstr (str + 1, "'");
str[0] = 0;
return (++str);
}
else {
str[0] = 0;
return NULL;
}
}
if (strstr (str, ",") == str) {
if (strlen (str) > 1) {
str[0] = 0;
return (++str);
}
else {
str[0] = 0;
return NULL;
}
}
if ((str = strstr (str, ",")) && strlen (str) > 1) {
str[0] = 0;
return (++str);
}
return NULL;
}
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