verify_clnt.c

[詳解]

/*++
/* NAME
/*  verify_clnt 3
/* SUMMARY
/*  address verification client interface
/* SYNOPSIS
/*  #include <verify_clnt.h>
/*
/*  int verify_clnt_query(addr, status, why)
/*  const char *addr;
/*  int *status;
/*  VSTRING *why;
/*
/*  int verify_clnt_update(addr, status, why)
/*  const char *addr;
/*  int status;
/*  const char *why;
/* DESCRIPTION
/*  verify_clnt_query() requests information about the given address.
/*  The result value is one of the valid status values (see
/*  status description below).
/*  In all cases the \fBwhy\fR argument provides additional
/*  information.
/*
/*  verify_clnt_update() requests that the status of the specified
/*  address be updated. The result status is DEL_REQ_RCPT_STAT_OK upon
/*  success, DEL_REQ_RCPT_STAT_DEFER upon failure.
/*
/*  Arguments
/* .IP addr
/*  The email address in question.
/* .IP status
/*  One of the following status codes:
/* .RS
/* .IP DEL_REQ_RCPT_STAT_OK
/*  The mail system did not detect any problems.
/* .IP DEL_REQ_RCPT_STAT_DEFER
/*  The status of the address is indeterminate.
/* .IP DEL_REQ_RCPT_STAT_BOUNCE
/*  The address is permanently undeliverable.
/* .RE
/* .IP why
/*  textual description of the status.
/* DIAGNOSTICS
/*  These functions return VRFY_STAT_OK in case of success,
/*  VRFY_STAT_BAD in case of a malformed request, and
/*  VRFY_STAT_FAIL when the operation failed.
/* SEE ALSO
/*  verify(8) Postfix address verification server
/* LICENSE
/* .ad
/* .fi
/*  The Secure Mailer license must be distributed with this software.
/* AUTHOR(S)
/*  Wietse Venema
/*  IBM T.J. Watson Research
/*  P.O. Box 704
/*  Yorktown Heights, NY 10598, USA
/*--*/

/* System library. */

#include <sys_defs.h>
#include <unistd.h>
#include <errno.h>

/* Utility library. */

#include <msg.h>
#include <vstream.h>
#include <vstring.h>
#include <attr.h>

/* Global library. */

#include <mail_params.h>
#include <mail_proto.h>
#include <clnt_stream.h>
#include <verify_clnt.h>

CLNT_STREAM *vrfy_clnt;

/* verify_clnt_init - initialize */

static void verify_clnt_init(void)
{
    if (vrfy_clnt != 0)
    msg_panic("verify_clnt_init: multiple initialization");
    vrfy_clnt = clnt_stream_create(MAIL_CLASS_PRIVATE, var_verify_service,
                   var_ipc_idle_limit, var_ipc_ttl_limit);
}

/* verify_clnt_query - request address verification status */

int     verify_clnt_query(const char *addr, int *addr_status, VSTRING *why)
{
    VSTREAM *stream;
    int     request_status;
    int     count = 0;

    /*
     * Do client-server plumbing.
     */
    if (vrfy_clnt == 0)
    verify_clnt_init();

    /*
     * Request status for this address.
     */
    for (;;) {
    stream = clnt_stream_access(vrfy_clnt);
    errno = 0;
    count += 1;
    if (attr_print(stream, ATTR_FLAG_NONE,
               SEND_ATTR_STR(MAIL_ATTR_REQ, VRFY_REQ_QUERY),
               SEND_ATTR_STR(MAIL_ATTR_ADDR, addr),
               ATTR_TYPE_END) != 0
        || vstream_fflush(stream)
        || attr_scan(stream, ATTR_FLAG_MISSING,
             RECV_ATTR_INT(MAIL_ATTR_STATUS, &request_status),
             RECV_ATTR_INT(MAIL_ATTR_ADDR_STATUS, addr_status),
             RECV_ATTR_STR(MAIL_ATTR_WHY, why),
             ATTR_TYPE_END) != 3) {
        if (msg_verbose || count > 1 || (errno && errno != EPIPE && errno != ENOENT))
        msg_warn("problem talking to service %s: %m",
             var_verify_service);
    } else {
        break;
    }
    sleep(1);
    clnt_stream_recover(vrfy_clnt);
    }
    return (request_status);
}

/* verify_clnt_update - request address status update */

int     verify_clnt_update(const char *addr, int addr_status, const char *why)
{
    VSTREAM *stream;
    int     request_status;

    /*
     * Do client-server plumbing.
     */
    if (vrfy_clnt == 0)
    verify_clnt_init();

    /*
     * Send status for this address. Supply a default status if the address
     * verification service is unavailable.
     */
    for (;;) {
    stream = clnt_stream_access(vrfy_clnt);
    errno = 0;
    if (attr_print(stream, ATTR_FLAG_NONE,
               SEND_ATTR_STR(MAIL_ATTR_REQ, VRFY_REQ_UPDATE),
               SEND_ATTR_STR(MAIL_ATTR_ADDR, addr),
               SEND_ATTR_INT(MAIL_ATTR_ADDR_STATUS, addr_status),
               SEND_ATTR_STR(MAIL_ATTR_WHY, why),
               ATTR_TYPE_END) != 0
        || attr_scan(stream, ATTR_FLAG_MISSING,
             RECV_ATTR_INT(MAIL_ATTR_STATUS, &request_status),
             ATTR_TYPE_END) != 1) {
        if (msg_verbose || (errno != EPIPE && errno != ENOENT))
        msg_warn("problem talking to service %s: %m",
             var_verify_service);
    } else {
        break;
    }
    sleep(1);
    clnt_stream_recover(vrfy_clnt);
    }
    return (request_status);
}

 /*
  * Proof-of-concept test client program.
  */
#ifdef TEST

#include <stdlib.h>
#include <ctype.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
#include <msg_vstream.h>
#include <stringops.h>
#include <vstring_vstream.h>
#include <mail_conf.h>

#define STR(x) vstring_str(x)

static NORETURN usage(char *myname)
{
    msg_fatal("usage: %s [-v]", myname);
}

static void query(char *query, VSTRING *buf)
{
    int     status;

    switch (verify_clnt_query(query, &status, buf)) {
    case VRFY_STAT_OK:
    vstream_printf("%-10s %d\n", "status", status);
    vstream_printf("%-10s %s\n", "text", STR(buf));
    vstream_fflush(VSTREAM_OUT);
    break;
    case VRFY_STAT_BAD:
    msg_warn("bad request format");
    break;
    case VRFY_STAT_FAIL:
    msg_warn("request failed");
    break;
    }
}

static void update(char *query)
{
    char   *addr;
    char   *status_text;
    char   *cp = query;

    if ((addr = mystrtok(&cp, CHARS_SPACE)) == 0
    || (status_text = mystrtok(&cp, CHARS_SPACE)) == 0) {
    msg_warn("bad request format");
    return;
    }
    while (*cp && ISSPACE(*cp))
    cp++;
    if (*cp == 0) {
    msg_warn("bad request format");
    return;
    }
    switch (verify_clnt_update(query, atoi(status_text), cp)) {
    case VRFY_STAT_OK:
    vstream_printf("OK\n");
    vstream_fflush(VSTREAM_OUT);
    break;
    case VRFY_STAT_BAD:
    msg_warn("bad request format");
    break;
    case VRFY_STAT_FAIL:
    msg_warn("request failed");
    break;
    }
}

int     main(int argc, char **argv)
{
    VSTRING *buffer = vstring_alloc(1);
    char   *cp;
    int     ch;
    char   *command;

    signal(SIGPIPE, SIG_IGN);

    msg_vstream_init(argv[0], VSTREAM_ERR);

    mail_conf_read();
    msg_info("using config files in %s", var_config_dir);
    if (chdir(var_queue_dir) < 0)
    msg_fatal("chdir %s: %m", var_queue_dir);

    while ((ch = GETOPT(argc, argv, "v")) > 0) {
    switch (ch) {
    case 'v':
        msg_verbose++;
        break;
    default:
        usage(argv[0]);
    }
    }
    if (argc - optind > 1)
    usage(argv[0]);

    while (vstring_fgets_nonl(buffer, VSTREAM_IN)) {
    cp = STR(buffer);
    if ((command = mystrtok(&cp, CHARS_SPACE)) == 0)
        continue;
    if (strcmp(command, "query") == 0)
        query(cp, buffer);
    else if (strcmp(command, "update") == 0)
        update(cp);
    else
        msg_warn("unrecognized command: %s", command);
    }
    vstring_free(buffer);
    return (0);
}

#endif