| /* Portions of this file are subject to the following copyrights. See |
| * the Net-SNMP's COPYING file for more details and other copyrights |
| * that may apply: |
| */ |
| /* |
| * Copyright © 2003 Sun Microsystems, Inc. All rights reserved. |
| * Use is subject to license terms specified in the COPYING file |
| * distributed with the Net-SNMP package. |
| */ |
| #include <net-snmp/net-snmp-config.h> |
| |
| #include "logmatch.h" |
| |
| #ifdef HAVE_REGEX_H |
| |
| #include <sys/types.h> |
| #include <sys/stat.h> |
| #include <errno.h> |
| #include <regex.h> |
| #include <time.h> |
| |
| #include <net-snmp/net-snmp-includes.h> |
| #include <net-snmp/agent/net-snmp-agent-includes.h> |
| |
| #include "util_funcs/header_generic.h" |
| #include "util_funcs/header_simple_table.h" |
| |
| /* |
| * ------------------------------------------------ |
| * This function checks if the filename pattern |
| * contains the % character indicating a variable |
| * filename (i.e. it uses date/time format control |
| * codes, see 'man date') then expands those control |
| * codes based on current time and sets the |
| * filename field in the struct. |
| * Returns 1 if the filename changed, 0 otherwise |
| * ------------------------------------------------- |
| */ |
| |
| static int |
| logmatch_update_filename(const char * pattern, char * currentFilename) |
| { |
| time_t t; |
| struct tm *tmp; |
| char newFilename[256]; |
| |
| /* |
| * ------------------------------------------------------------------- |
| * if the filename pattern doesn't have the "%" character just return, |
| * since there is no need for further processing |
| * ------------------------------------------------------------------- |
| */ |
| if (strchr(pattern, '%') == NULL) { |
| return 0; |
| } |
| |
| t = time(NULL); |
| tmp = localtime(&t); |
| |
| if (tmp == NULL) { |
| perror("localtime"); |
| return 0; |
| } |
| |
| /* result of expansion must fit into newFilename, otherwise returning */ |
| if (strftime(newFilename, sizeof(newFilename), pattern, tmp) == 0) { |
| return 0; |
| } |
| |
| /* if same as current filename, just return */ |
| if (strcmp(currentFilename, newFilename) == 0) { |
| return 0; |
| } else { |
| /* otherwise update currentFilename and return 1 */ |
| strcpy(currentFilename, newFilename); |
| return 1; |
| } |
| } |
| |
| struct logmatchstat { |
| char filenamePattern[256]; |
| char filename[256]; |
| char regEx[256]; |
| char name[256]; |
| FILE *logfile; |
| long currentFilePosition; |
| unsigned long globalMatchCounter; |
| unsigned long currentMatchCounter; |
| unsigned long matchCounter; |
| regex_t regexBuffer; |
| int myRegexError; |
| int virgin; |
| int thisIndex; |
| int frequency; |
| }; |
| |
| #define MAXLOGMATCH 250 |
| |
| static struct logmatchstat logmatchTable[MAXLOGMATCH]; |
| static int logmatchCount = 0; |
| |
| /*************************************************************** |
| * * |
| * updateLogmatch * |
| * this function is called back by snmpd alarms * |
| * * |
| ***************************************************************/ |
| |
| static void |
| updateLogmatch(int iindex) |
| { |
| |
| int matchResultCode; |
| char inbuf[1024]; |
| char perfilename[1024]; |
| FILE *perfile; |
| unsigned long pos, ccounter, counter; |
| int result; |
| int toobig; |
| int anyChanges = FALSE; |
| struct stat sb; |
| char lastFilename[256]; |
| |
| /* |
| * ------------------------------------ |
| * we can never be sure if this is the |
| * last time we are being called here, |
| * so we always update a persistent |
| * data file with our current file |
| * position |
| * ------------------------------------ |
| */ |
| |
| snprintf(perfilename, sizeof(perfilename), "%s/snmpd_logmatch_%s.pos", |
| get_persistent_directory(), logmatchTable[iindex].name); |
| |
| if (logmatchTable[iindex].virgin) { |
| |
| /* |
| * ------------------------------------ |
| * this is the first time we are being |
| * called; let's try to find an old |
| * file position stored in a persistent |
| * data file and restore it |
| * ------------------------------------ |
| */ |
| |
| if ((perfile = fopen(perfilename, "r"))) { |
| |
| /* |
| * ------------------------------------ |
| * the persistent data file exists so |
| * let's read it out |
| * ------------------------------------ |
| */ |
| |
| |
| pos = counter = ccounter = 0; |
| |
| if (fscanf(perfile, "%lu %lu %lu %s", |
| &pos, &ccounter, &counter, lastFilename)) { |
| |
| |
| /* |
| * ------------------------------------ |
| * the data could be read; now let's |
| * try to open the logfile to be |
| * scanned |
| * ------------------------------------ |
| */ |
| |
| if (logmatch_update_filename(logmatchTable[iindex].filenamePattern, |
| lastFilename) == 0) { |
| |
| /* |
| * --------------------------------- |
| * the filename is still the same as |
| * the one stored in the persistent |
| * data file. |
| * --------------------------------- |
| */ |
| |
| if ((logmatchTable[iindex].logfile = |
| fopen(logmatchTable[iindex].filename, "r"))) { |
| |
| |
| /* |
| * ------------------------------------ |
| * the log file could be opened; now |
| * let's try to set the pointer |
| * ------------------------------------ |
| */ |
| |
| if (!fseek |
| (logmatchTable[iindex].logfile, pos, SEEK_SET)) { |
| |
| |
| /* |
| * ------------------------------------ |
| * the pointer could be set - this is |
| * the most that we can do: if the |
| * pointer is smaller than the file |
| * size we must assume that the pointer |
| * still points to where it read the |
| * file last time; let's restore the |
| * data |
| * ------------------------------------ |
| */ |
| |
| logmatchTable[iindex].currentFilePosition = pos; |
| logmatchTable[iindex].currentMatchCounter = |
| ccounter; |
| } |
| |
| fclose(logmatchTable[iindex].logfile); |
| } |
| } |
| logmatchTable[iindex].globalMatchCounter = counter; |
| } |
| |
| fclose(perfile); |
| } |
| |
| logmatchTable[iindex].virgin = FALSE; |
| } |
| |
| /* |
| * ------------------------------------------- |
| * check if a new input file needs to be opened |
| * if yes, reset counter and position |
| * ------------------------------------------- |
| */ |
| |
| if (logmatch_update_filename(logmatchTable[iindex].filenamePattern, |
| logmatchTable[iindex].filename) == 1) { |
| logmatchTable[iindex].currentFilePosition = 0; |
| logmatchTable[iindex].currentMatchCounter = 0; |
| } |
| |
| |
| /* |
| * ------------------------------------ |
| * now the pointer and the counter are |
| * set either zero or reset to old |
| * value; now let's try to read some |
| * data |
| * ------------------------------------ |
| */ |
| |
| if (stat(logmatchTable[iindex].filename, &sb) == 0) { |
| |
| if (logmatchTable[iindex].currentFilePosition > sb.st_size) { |
| toobig = TRUE; |
| } else { |
| toobig = FALSE; |
| } |
| |
| if ((logmatchTable[iindex].logfile = |
| fopen(logmatchTable[iindex].filename, "r"))) { |
| |
| result = |
| fseek(logmatchTable[iindex].logfile, |
| logmatchTable[iindex].currentFilePosition, SEEK_SET); |
| |
| if (result || toobig || (errno == EINVAL) |
| || feof(logmatchTable[iindex].logfile)) { |
| |
| |
| /* |
| * ------------------------------------ |
| * when we are here that means we |
| * could't set the file position maybe |
| * the file was rotated; let's reset |
| * the filepointer, but not the counter |
| * ------------------------------------ |
| */ |
| |
| |
| logmatchTable[iindex].currentFilePosition = 0; |
| logmatchTable[iindex].currentMatchCounter = 0; |
| fseek(logmatchTable[iindex].logfile, 0, SEEK_SET); |
| anyChanges = TRUE; |
| } |
| |
| while (fgets |
| (inbuf, sizeof(inbuf), logmatchTable[iindex].logfile)) { |
| |
| matchResultCode = |
| regexec(&(logmatchTable[iindex].regexBuffer), |
| inbuf, 0, NULL, REG_NOTEOL); |
| |
| if (matchResultCode == 0) { |
| logmatchTable[iindex].globalMatchCounter++; |
| logmatchTable[iindex].currentMatchCounter++; |
| logmatchTable[iindex].matchCounter++; |
| anyChanges = TRUE; |
| } |
| } |
| |
| logmatchTable[iindex].currentFilePosition = |
| ftell(logmatchTable[iindex].logfile); |
| fclose(logmatchTable[iindex].logfile); |
| } |
| } |
| |
| |
| /* |
| * ------------------------------------ |
| * at this point we can be safe that |
| * our current file position is |
| * straightened out o.k. - we never |
| * know if this is the last time we are |
| * being called so save the position |
| * in a file |
| * ------------------------------------ |
| */ |
| |
| if (anyChanges && (perfile = fopen(perfilename, "w"))) { |
| |
| |
| /* |
| * ------------------------------------ |
| * o.k. lets write out our variable |
| * ------------------------------------ |
| */ |
| |
| fprintf(perfile, "%lu %lu %lu %s\n", |
| logmatchTable[iindex].currentFilePosition, |
| logmatchTable[iindex].currentMatchCounter, |
| logmatchTable[iindex].globalMatchCounter, |
| logmatchTable[iindex].filename); |
| |
| fclose(perfile); |
| } |
| |
| } |
| |
| |
| static void |
| updateLogmatch_Scheduled(unsigned int registrationNumber, |
| struct logmatchstat *logmatchtable) |
| { |
| updateLogmatch(logmatchtable->thisIndex); |
| } |
| |
| /*************************************************************** |
| * * |
| * logmatch_parse_config * |
| * parse one line from snmpd.conf * |
| * * |
| ***************************************************************/ |
| |
| static void |
| logmatch_parse_config(const char *token, char *cptr) |
| { |
| |
| char space_name; |
| char space_path; |
| |
| if (logmatchCount < MAXLOGMATCH) { |
| logmatchTable[logmatchCount].frequency = 30; |
| logmatchTable[logmatchCount].thisIndex = logmatchCount; |
| |
| |
| /* |
| * ------------------------------------ |
| * be careful this counter needs to be |
| * reset from persistent storage |
| * ------------------------------------ |
| */ |
| |
| logmatchTable[logmatchCount].globalMatchCounter = 0; |
| logmatchTable[logmatchCount].currentMatchCounter = 0; |
| logmatchTable[logmatchCount].matchCounter = 0; |
| logmatchTable[logmatchCount].virgin = TRUE; |
| logmatchTable[logmatchCount].currentFilePosition = 0; |
| |
| |
| /* |
| * ------------------------------------ |
| * be careful: the flag 255 must fit to |
| * the size of regEx as definded in |
| * logmatch.h |
| * ------------------------------------ |
| */ |
| |
| sscanf(cptr, "%255s%c%255s%c %d %255c\n", |
| logmatchTable[logmatchCount].name, |
| &space_name, |
| logmatchTable[logmatchCount].filenamePattern, |
| &space_path, |
| &(logmatchTable[logmatchCount].frequency), |
| logmatchTable[logmatchCount].regEx); |
| |
| /* fill in filename with initial data */ |
| strcpy(logmatchTable[logmatchCount].filename, |
| logmatchTable[logmatchCount].filenamePattern); |
| logmatch_update_filename(logmatchTable[logmatchCount].filenamePattern, |
| logmatchTable[logmatchCount].filename); |
| |
| /* |
| * Log an error then return if any of the strings scanned in were |
| * larger then they should have been. |
| */ |
| if (space_name != ' ') { |
| snmp_log(LOG_ERR, "logmatch_parse_config: the name scanned " \ |
| "in from line %s is too large. logmatchCount = %d\n", |
| cptr, logmatchCount); |
| return; |
| } else if (space_path != ' ') { |
| snmp_log(LOG_ERR, "logmatch_parse_config: the file name " \ |
| "scanned in from line %s is too large. logmatchCount = %d\n", |
| cptr, logmatchCount); |
| return; |
| } |
| |
| /* |
| * ------------------------------------ |
| * just to be safe "NULL" the end of |
| * the arary regEx as sscanf won't do |
| * it with the %c modifier |
| * ------------------------------------ |
| */ |
| |
| logmatchTable[logmatchCount].regEx[255] = '\0'; |
| |
| |
| /* |
| * ------------------------------------ |
| * now compile the regular expression |
| * ------------------------------------ |
| */ |
| |
| logmatchTable[logmatchCount].myRegexError = |
| regcomp(&(logmatchTable[logmatchCount].regexBuffer), |
| logmatchTable[logmatchCount].regEx, |
| REG_EXTENDED | REG_NOSUB); |
| |
| if (logmatchTable[logmatchCount].frequency > 0) { |
| snmp_alarm_register(logmatchTable[logmatchCount].frequency, |
| SA_REPEAT, |
| (SNMPAlarmCallback *) |
| updateLogmatch_Scheduled, |
| &(logmatchTable[logmatchCount]) |
| ); |
| } |
| |
| logmatchCount++; |
| } |
| } |
| |
| /*************************************************************** |
| * * |
| * logmatch_free_config * |
| * free memory allocated by this mib module * |
| * * |
| ***************************************************************/ |
| |
| static void |
| logmatch_free_config(void) |
| { |
| int i; |
| |
| /* |
| * ------------------------------------ |
| * the only memory we have allocated |
| * is the memory allocated by regcomp |
| * ------------------------------------ |
| */ |
| |
| for (i = 0; i < logmatchCount; i++) { |
| |
| regfree(&(logmatchTable[i].regexBuffer)); |
| } |
| logmatchCount = 0; |
| } |
| |
| |
| #define LOGMATCH_INFO 0 |
| #define LOGMATCH_INDEX 1 |
| #define LOGMATCH_NAME 2 |
| #define LOGMATCH_FILENAME 3 |
| #define LOGMATCH_REGEX 4 |
| #define LOGMATCH_GLOBALCTR 5 |
| #define LOGMATCH_GLOBALCNT 6 |
| #define LOGMATCH_CURRENTCTR 7 |
| #define LOGMATCH_CURRENTCNT 8 |
| #define LOGMATCH_COUNTER 9 |
| #define LOGMATCH_COUNT 10 |
| #define LOGMATCH_FREQ 11 |
| #define LOGMATCH_ERROR 100 |
| #define LOGMATCH_MSG 101 |
| |
| /* |
| * OID functions |
| */ |
| |
| static u_char * |
| var_logmatch_table(struct variable *vp, |
| oid * name, |
| size_t * length, |
| int exact, |
| size_t * var_len, WriteMethod ** write_method) |
| { |
| static long long_ret; |
| static char message[1024]; |
| int iindex; |
| struct logmatchstat *logmatch; |
| |
| if (vp->magic == LOGMATCH_INFO) { |
| if (header_generic(vp, name, length, exact, var_len, write_method) |
| == MATCH_FAILED) |
| return (NULL); |
| } else { |
| if (header_simple_table |
| (vp, name, length, exact, var_len, write_method, |
| logmatchCount)) |
| return (NULL); |
| } |
| |
| |
| iindex = name[*length - 1] - 1; |
| logmatch = &logmatchTable[iindex]; |
| |
| if (logmatch->myRegexError == 0) |
| updateLogmatch(iindex); |
| |
| switch (vp->magic) { |
| case LOGMATCH_INFO: |
| long_ret = MAXLOGMATCH; |
| return (u_char *) & long_ret; |
| |
| case LOGMATCH_INDEX: |
| long_ret = iindex + 1; |
| return (u_char *) & long_ret; |
| |
| case LOGMATCH_NAME: |
| *var_len = strlen(logmatch->name); |
| return (u_char *) logmatch->name; |
| |
| case LOGMATCH_FILENAME: |
| *var_len = strlen(logmatch->filename); |
| return (u_char *) logmatch->filename; |
| |
| case LOGMATCH_REGEX: |
| *var_len = strlen(logmatch->regEx); |
| return (u_char *) logmatch->regEx; |
| |
| case LOGMATCH_GLOBALCTR: |
| case LOGMATCH_GLOBALCNT: |
| long_ret = (logmatch->globalMatchCounter); |
| return (u_char *) & long_ret; |
| |
| case LOGMATCH_CURRENTCTR: |
| case LOGMATCH_CURRENTCNT: |
| long_ret = (logmatch->currentMatchCounter); |
| return (u_char *) & long_ret; |
| |
| case LOGMATCH_COUNTER: |
| case LOGMATCH_COUNT: |
| long_ret = (logmatch->matchCounter); |
| logmatch->matchCounter = 0; |
| return (u_char *) & long_ret; |
| |
| case LOGMATCH_FREQ: |
| long_ret = logmatch->frequency; |
| return (u_char *) & long_ret; |
| |
| case LOGMATCH_ERROR: |
| if (logmatch->frequency >= 0 && logmatch->myRegexError == 0) |
| long_ret = 0; |
| else |
| long_ret = 1; |
| |
| return (u_char *) & long_ret; |
| |
| case LOGMATCH_MSG: |
| |
| regerror(logmatch->myRegexError, &(logmatch->regexBuffer), message, |
| sizeof(message)); |
| |
| *var_len = strlen(message); |
| return (u_char *) message; |
| |
| default: |
| DEBUGMSGTL(("snmpd", "unknown sub-id %d in var_logmatch_table\n", |
| vp->magic)); |
| } |
| |
| return NULL; |
| } |
| |
| void |
| init_logmatch(void) |
| { |
| struct variable2 logmatch_info[] = { |
| {LOGMATCH_INFO, ASN_INTEGER, NETSNMP_OLDAPI_RONLY, |
| var_logmatch_table, 0} |
| }; |
| |
| struct variable2 logmatch_table[] = { |
| {LOGMATCH_INDEX, ASN_INTEGER, NETSNMP_OLDAPI_RONLY, |
| var_logmatch_table, 1, {1}}, |
| {LOGMATCH_NAME, ASN_OCTET_STR, NETSNMP_OLDAPI_RONLY, |
| var_logmatch_table, 1, {2}}, |
| {LOGMATCH_FILENAME, ASN_OCTET_STR, NETSNMP_OLDAPI_RONLY, |
| var_logmatch_table, 1, {3}}, |
| {LOGMATCH_REGEX, ASN_OCTET_STR, NETSNMP_OLDAPI_RONLY, |
| var_logmatch_table, 1, {4}}, |
| {LOGMATCH_GLOBALCTR, ASN_COUNTER, NETSNMP_OLDAPI_RONLY, |
| var_logmatch_table, 1, {5}}, |
| {LOGMATCH_GLOBALCNT, ASN_INTEGER, NETSNMP_OLDAPI_RONLY, |
| var_logmatch_table, 1, {6}}, |
| {LOGMATCH_CURRENTCTR, ASN_COUNTER, NETSNMP_OLDAPI_RONLY, |
| var_logmatch_table, 1, {7}}, |
| {LOGMATCH_CURRENTCNT, ASN_INTEGER, NETSNMP_OLDAPI_RONLY, |
| var_logmatch_table, 1, {8}}, |
| {LOGMATCH_COUNTER, ASN_COUNTER, NETSNMP_OLDAPI_RONLY, |
| var_logmatch_table, 1, {9}}, |
| {LOGMATCH_COUNT, ASN_INTEGER, NETSNMP_OLDAPI_RONLY, |
| var_logmatch_table, 1, {10}}, |
| {LOGMATCH_FREQ, ASN_INTEGER, NETSNMP_OLDAPI_RONLY, |
| var_logmatch_table, 1, {11}}, |
| {LOGMATCH_ERROR, ASN_INTEGER, NETSNMP_OLDAPI_RONLY, |
| var_logmatch_table, 1, {100}}, |
| {LOGMATCH_MSG, ASN_OCTET_STR, NETSNMP_OLDAPI_RONLY, |
| var_logmatch_table, 1, {101}} |
| }; |
| |
| /* |
| * Define the OID pointer to the top of the mib tree that we're |
| * registering underneath |
| */ |
| oid logmatch_info_oid[] = { NETSNMP_UCDAVIS_MIB, 16, 1 }; |
| oid logmatch_variables_oid[] = { NETSNMP_UCDAVIS_MIB, 16, 2, 1 }; |
| |
| /* |
| * register ourselves with the agent to handle our mib tree |
| */ |
| REGISTER_MIB("ucd-snmp/logmatch", logmatch_info, variable2, |
| logmatch_info_oid); |
| REGISTER_MIB("ucd-snmp/logmatch", logmatch_table, variable2, |
| logmatch_variables_oid); |
| |
| snmpd_register_config_handler("logmatch", logmatch_parse_config, |
| logmatch_free_config, |
| "logmatch name path cycletime regex"); |
| |
| } |
| |
| #endif /* HAVE_REGEX_H */ |
