mta_sendmail.c

snmp的源代码,已经在我的ubuntu下编译通过

/*
 *  MTA-MIB implementation for sendmail - mibII/mta_sendmail.c
 *  Christoph Mammitzsch <[e-mail]>
 *
 * todo: put queue directory into description?
 *
 *  13.02.2002:
 *    - support sendmail 8.12 queue groups
 *
 *
 *  05.04.2000:
 *
 *    - supports sendmail 8.10.0 statistics files now
 *    - function read_option has been removed
 *
 *  12.04.2000:
 *
 *    - renamed configuration tokens:
 *        sendmail config        -> sendmail_config
 *        sendmail stats         -> sendmail_stats
 *        sendmail queue         -> sendmail_queue
 *        sendmail index         -> sendmail_index
 *        sendmail statcachetime -> sendmail_stats_t
 *        sendmail dircacetime   -> sendmail_queue_t
 *
 *    - now using snmpd_register_config_handler instead of config_parse_dot_conf
 *
 *  15.04.2000:
 *
 *    - introduced new function print_error
 *    - changed open_sendmailst and read_sendmailcf to use the new function
 *    - changed calls to open_sendmailst and read_sendmailcf
 *    - added some error handling to calls to chdir(), close() and closedir()
 *
 */


/** "include files" */
#ifdef __lint
# define SNMP_NO_DEBUGGING 1    /* keeps lint from complaining about the DEBUGMSG* macros */
#endif

#include <net-snmp/net-snmp-config.h>

#include <net-snmp/net-snmp-includes.h>
#include <net-snmp/agent/net-snmp-agent-includes.h>

#include "mta_sendmail.h"

#include <sys/types.h>

#include <stdio.h>

#include <ctype.h>

#ifdef HAVE_STRING_H
# include <string.h>
#else
# include <strings.h>
#endif

#if HAVE_STDLIB_H
#include <stdlib.h>
#endif

#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif

#ifdef HAVE_FCNTL_H
# include <fcntl.h>
#endif

#if HAVE_DIRENT_H
#include <dirent.h>
#else
# define dirent direct
# if HAVE_SYS_NDIR_H
#  include <sys/ndir.h>
# endif
# if HAVE_SYS_DIR_H
#  include <sys/dir.h>
# endif
# if HAVE_NDIR_H
#  include <ndir.h>
# endif
#endif

#ifdef HAVE_SYS_STAT_H
# include <sys/stat.h>
#endif

#if TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
#else
# if HAVE_SYS_TIME_H
#  include <sys/time.h>
# else
#  include <time.h>
# endif
#endif

#if HAVE_STDARG_H
#include <stdarg.h>
#else
#include <varargs.h>
#endif

#include <errno.h>

 /**/
/** "macros and variables for registering the OID tree" */
    /*
     * prefix for all OIDs 
     */

static FindVarMethod var_mtaEntry;
static FindVarMethod var_mtaGroupEntry;

static oid      mta_variables_oid[] = { 1, 3, 6, 1, 2, 1, 28 };

/*
 * bits that indicate what's needed to compute the value 
 */
#define   NEEDS_STATS   (1 << 6)
#define   NEEDS_DIR     (1 << 7)
#define   NEEDS         (NEEDS_STATS | NEEDS_DIR)

/*
 * symbolic names for the magic values 
 */
enum {
    MTARECEIVEDMESSAGES = 3 | NEEDS_STATS,
    MTASTOREDMESSAGES = 4 | NEEDS_DIR,
    MTATRANSMITTEDMESSAGES = 5 | NEEDS_STATS,
    MTARECEIVEDVOLUME = 6 | NEEDS_STATS,
    MTASTOREDVOLUME = 7 | NEEDS_DIR,
    MTATRANSMITTEDVOLUME = 8 | NEEDS_STATS,
    MTAGROUPSTOREDMESSAGES = 17 | NEEDS_DIR,
    MTAGROUPSTOREDVOLUME = 18 | NEEDS_DIR,
    MTAGROUPRECEIVEDMESSAGES = 19 | NEEDS_STATS,
    MTAGROUPREJECTEDMESSAGES = 20 | NEEDS_STATS,
    MTAGROUPTRANSMITTEDMESSAGES = 22 | NEEDS_STATS,
    MTAGROUPRECEIVEDVOLUME = 23 | NEEDS_STATS,
    MTAGROUPTRANSMITTEDVOLUME = 25 | NEEDS_STATS,
    MTAGROUPNAME = 43,
    MTAGROUPHIERARCHY = 49,
};

/*
 * structure that tells the agent, which function returns what values 
 */
static struct variable3 mta_variables[] = {
    {MTARECEIVEDMESSAGES, ASN_COUNTER, RONLY, var_mtaEntry, 3, {1, 1, 1}},
    {MTASTOREDMESSAGES, ASN_GAUGE, RONLY, var_mtaEntry, 3, {1, 1, 2}},
    {MTATRANSMITTEDMESSAGES, ASN_COUNTER, RONLY, var_mtaEntry, 3,
     {1, 1, 3}},
    {MTARECEIVEDVOLUME, ASN_COUNTER, RONLY, var_mtaEntry, 3, {1, 1, 4}},
    {MTASTOREDVOLUME, ASN_GAUGE, RONLY, var_mtaEntry, 3, {1, 1, 5}},
    {MTATRANSMITTEDVOLUME, ASN_COUNTER, RONLY, var_mtaEntry, 3, {1, 1, 6}},

    {MTAGROUPRECEIVEDMESSAGES, ASN_COUNTER, RONLY, var_mtaGroupEntry, 3,
     {2, 1, 2}},
    {MTAGROUPREJECTEDMESSAGES, ASN_COUNTER, RONLY, var_mtaGroupEntry, 3,
     {2, 1, 3}},
    {MTAGROUPSTOREDMESSAGES, ASN_GAUGE, RONLY, var_mtaGroupEntry, 3,
     {2, 1, 4}},
    {MTAGROUPTRANSMITTEDMESSAGES, ASN_COUNTER, RONLY, var_mtaGroupEntry, 3,
     {2, 1, 5}},
    {MTAGROUPRECEIVEDVOLUME, ASN_COUNTER, RONLY, var_mtaGroupEntry, 3,
     {2, 1, 6}},
    {MTAGROUPSTOREDVOLUME, ASN_GAUGE, RONLY, var_mtaGroupEntry, 3,
     {2, 1, 7}},
    {MTAGROUPTRANSMITTEDVOLUME, ASN_COUNTER, RONLY, var_mtaGroupEntry, 3,
     {2, 1, 8}},
    {MTAGROUPNAME, ASN_OCTET_STR, RONLY, var_mtaGroupEntry, 3, {2, 1, 25}},
    {MTAGROUPHIERARCHY, ASN_INTEGER, RONLY, var_mtaGroupEntry, 3,
     {2, 1, 31}},
};
 /**/
/** "other macros and structures" */
    /*
     * for boolean values 
     */
#ifndef FALSE
#define FALSE 0
#endif
#ifndef TRUE
#define TRUE  1
#endif
#ifndef BOOL
#define BOOL  short
#endif
    /*
     * important constants 
     */
#define FILENAMELEN     200     /* maximum length for filenames */
#define MAXMAILERS       25     /* maximum number of mailers (copied from the sendmail sources) */
#define MAXQUEUEGROUPS   50     /* maximum # of queue groups (copied from sendmail) */
#define MNAMELEN         20     /* maximum length of mailernames (copied from the sendmail sources) */
#define STAT_VERSION_8_9  2     /* version of sendmail V8.9.x statistics files (copied from the sendmail sources) */
#define STAT_VERSION_8_10 3     /* version of sendmail V8.10.x statistics files (copied from the sendmail sources) */
#define STAT_VERSION_8_12_QUAR 4     /* version of sendmail V8.12.x statistics files using -D_FFR_QUARANTINE (commercial and edge-living opensource*/
#define STAT_MAGIC  0x1B1DE     /* magic value to identify statistics files from sendmail V8.9.x or higher (copied from the sendmail sources) */
    /*
     * structure of sendmail.st file from sendmail V8.10.x (copied from the sendmail sources) 
     */

struct statisticsV8_12_QUAR {
    int             stat_magic; /* magic number */
    int             stat_version;       /* stat file version */
    time_t          stat_itime; /* file initialization time */
    short           stat_size;  /* size of this structure */
    long            stat_cf;    /* # from connections */
    long            stat_ct;    /* # to connections */
    long            stat_cr;    /* # rejected connections */
    long            stat_nf[MAXMAILERS];        /* # msgs from each mailer */
    long            stat_bf[MAXMAILERS];        /* kbytes from each mailer */
    long            stat_nt[MAXMAILERS];        /* # msgs to each mailer */
    long            stat_bt[MAXMAILERS];        /* kbytes to each mailer */
    long            stat_nr[MAXMAILERS];        /* # rejects by each mailer */
    long            stat_nd[MAXMAILERS];        /* # discards by each mailer */
    long            stat_nq[MAXMAILERS];        /* # quarantines by each mailer*/
};

    struct statisticsV8_10 {
    int             stat_magic; /* magic number */
    int             stat_version;       /* stat file version */
    time_t          stat_itime; /* file initialization time */
    short           stat_size;  /* size of this structure */
    long            stat_cf;    /* # from connections */
    long            stat_ct;    /* # to connections */
    long            stat_cr;    /* # rejected connections */
    long            stat_nf[MAXMAILERS];        /* # msgs from each mailer */
    long            stat_bf[MAXMAILERS];        /* kbytes from each mailer */
    long            stat_nt[MAXMAILERS];        /* # msgs to each mailer */
    long            stat_bt[MAXMAILERS];        /* kbytes to each mailer */
    long            stat_nr[MAXMAILERS];        /* # rejects by each mailer */
    long            stat_nd[MAXMAILERS];        /* # discards by each mailer */

};

/*
 * structure of sendmail.st file from sendmail V8.9.x (copied from the sendmail sources) 
 */
struct statisticsV8_9 {
    int             stat_magic; /* magic number */
    int             stat_version;       /* stat file version */
    time_t          stat_itime; /* file initialization time */
    short           stat_size;  /* size of this structure */
    long            stat_nf[MAXMAILERS];        /* # msgs from each mailer */
    long            stat_bf[MAXMAILERS];        /* kbytes from each mailer */
    long            stat_nt[MAXMAILERS];        /* # msgs to each mailer */
    long            stat_bt[MAXMAILERS];        /* kbytes to each mailer */
    long            stat_nr[MAXMAILERS];        /* # rejects by each mailer */
    long            stat_nd[MAXMAILERS];        /* # discards by each mailer */
};

/*
 * structure of sendmail.st file from sendmail V8.8.x (copied from the sendmail sources) 
 */
struct statisticsV8_8 {
    time_t          stat_itime; /* file initialization time */
    short           stat_size;  /* size of this structure */
    long            stat_nf[MAXMAILERS];        /* # msgs from each mailer */
    long            stat_bf[MAXMAILERS];        /* kbytes from each mailer */
    long            stat_nt[MAXMAILERS];        /* # msgs to each mailer */
    long            stat_bt[MAXMAILERS];        /* kbytes to each mailer */
};
 /**/
    /*
     * queue groups (strictly a sendmail 8.12+ thing 
     */
    struct QDir {
    char            dir[FILENAMELEN + 1];
    struct QDir    *next;
};

struct QGrp {
    char           *name;       /* name of queuegroup */

    time_t          last;       /* last time we counted */
    int             count;      /* # of files */
    int             size;       /* size of files */

    struct QDir    *dirs;       /* directories in queue group */
};

/** "static variables" */

/*
 * a list of all the queue groups, NULL terminated 
 */
static struct QGrp qgrps[MAXQUEUEGROUPS];
static int      nqgrps = 0;

static char     sendmailst_fn[FILENAMELEN + 1]; /* name of statistics file */
static int      sendmailst_fh = -1;     /* filehandle for statistics file */
static char     sendmailcf_fn[FILENAMELEN + 1]; /* name of sendmails config file */
static char     mailernames[MAXMAILERS][MNAMELEN + 1];  /* array of mailer names */
static int      mailers = MAXMAILERS;   /* number of mailer names in array */

static long    *stat_nf;        /* pointer to stat_nf array within the statistics structure */
static long    *stat_bf;        /* pointer to stat_bf array within the statistics structure */
static long    *stat_nt;        /* pointer to stat_nt array within the statistics structure */
static long    *stat_bt;        /* pointer to stat_bt array within the statistics structure */
static long    *stat_nr;        /* pointer to stat_nr array within the statistics structure,
                                 * only valid for statistics files from sendmail >=V8.9.0    */
static long    *stat_nd;        /* pointer to stat_nd array within the statistics structure,
                                 * only valid for statistics files from sendmail >=V8.9.0    */
static int      stats_size;     /* size of statistics structure */
static long     stats[sizeof(struct statisticsV8_12_QUAR) / sizeof(long) + 1];       /* buffer for statistics structure */
static time_t   lastreadstats;  /* time stats file has been read */
static long     applindex = 1;  /* ApplIndex value for OIDs */
static long     stat_cache_time = 5;    /* time (in seconds) to wait before reading stats file again */
static long     dir_cache_time = 10;    /* time (in seconds) to wait before scanning queue directoy again */

 /**/
/** static void print_error(int priority, BOOL config, BOOL config_only, char *function, char *format, ...)
 *
 *  Description:
 *
 *    Called to print errors. It uses the config_perror or the snmp_log function
 *    depending on whether the config parameter is TRUE or FALSE.
 *
 *  Parameters:
 *
 *    priority:    priority to be used when calling the snmp_log function
 *
 *    config:      indicates whether this function has been called during the
 *                 configuration process or not. If set to TRUE, the function
 *                 config_perror will be used to report the error.
 *
 *    config_only: if set to TRUE, the error will only be printed when function
 *                 has been called during the configuration process.
 *
 *    function:    name of the calling function. Used when printing via snmp_log.
 *
 *    format:      format string for the error message
 *
 *    ...:         additional parameters to insert into the error message string
 *
 */
#if HAVE_STDARG_H
    static void
print_error(int priority, BOOL config, BOOL config_only,
            const char *function, const char *format, ...)
#else
    static void
print_error(va_alist)
     va_dcl
#endif
{
    va_list         ap;
    char            buffer[2 * FILENAMELEN + 200];      /* I know, that's not perfectly safe, but since I don't use more
                                                         * than two filenames in one error message, that should be enough */

#if HAVE_STDARG_H
    va_start(ap, format);
#else
    int             priority;
    BOOL            config;
    BOOL            config_only;
    const char     *function;
    const char     *format;

    va_start(ap);
    priority = va_arg(ap, int);
    config = va_arg(ap, BOOL);
    config_only = va_arg(ap, BOOL);
    function = va_arg(ap, char *);
    format = va_arg(ap, char *);
#endif

    vsnprintf(buffer, sizeof(buffer), format, ap);

    if (config) {
        config_perror(buffer);
    } else if (!config_only) {
        snmp_log(priority, "%s: %s\n", function, buffer);
    }
    va_end(ap);
}