qmqp-sink.c

[詳解]

/*++
/* NAME
/*  qmqp-sink 1
/* SUMMARY
/*  parallelized QMQP test server
/* SYNOPSIS
/* .fi
/*  \fBqmqp-sink\fR [\fB-46cv\fR] [\fB-x \fItime\fR]
/*  [\fBinet:\fR][\fIhost\fR]:\fIport\fR \fIbacklog\fR
/*
/*  \fBqmqp-sink\fR [\fB-46cv\fR] [\fB-x \fItime\fR]
/*  \fBunix:\fR\fIpathname\fR \fIbacklog\fR
/* DESCRIPTION
/*  \fBqmqp-sink\fR listens on the named host (or address) and port.
/*  It receives messages from the network and throws them away.
/*  The purpose is to measure QMQP client performance, not protocol
/*  compliance.
/*  Connections can be accepted on IPv4 or IPv6 endpoints, or on
/*  UNIX-domain sockets.
/*  IPv4 and IPv6 are the default.
/*  This program is the complement of the \fBqmqp-source\fR(1) program.
/*
/*  Note: this is an unsupported test program. No attempt is made
/*  to maintain compatibility between successive versions.
/*
/*  Arguments:
/* .IP \fB-4\fR
/*  Support IPv4 only. This option has no effect when
/*  Postfix is built without IPv6 support.
/* .IP \fB-6\fR
/*  Support IPv6 only. This option is not available when
/*  Postfix is built without IPv6 support.
/* .IP \fB-c\fR
/*  Display a running counter that is updated whenever a delivery
/*  is completed.
/* .IP \fB-v\fR
/*  Increase verbosity. Specify \fB-v -v\fR to see some of the QMQP
/*  conversation.
/* .IP "\fB-x \fItime\fR"
/*  Terminate after \fItime\fR seconds. This is to facilitate memory
/*  leak testing.
/* SEE ALSO
/*  qmqp-source(1), QMQP message generator
/* 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
/*
/*  Wietse Venema
/*  Google, Inc.
/*  111 8th Avenue
/*  New York, NY 10011, USA
/*--*/

/* System library. */

#include <sys_defs.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <fcntl.h>
#include <signal.h>

/* Utility library. */

#include <msg.h>
#include <vstring.h>
#include <vstream.h>
#include <listen.h>
#include <events.h>
#include <mymalloc.h>
#include <iostuff.h>
#include <msg_vstream.h>
#include <netstring.h>
#include <inet_proto.h>

/* Global library. */

#include <qmqp_proto.h>
#include <mail_version.h>

/* Application-specific. */

typedef struct {
    VSTREAM *stream;            /* client connection */
    int     count;          /* bytes to go */
} SINK_STATE;

static int var_tmout;
static VSTRING *buffer;
static void disconnect(SINK_STATE *);
static int count_deliveries;
static int counter;

/* send_reply - finish conversation */

static void send_reply(SINK_STATE *state)
{
    vstring_sprintf(buffer, "%cOk", QMQP_STAT_OK);
    NETSTRING_PUT_BUF(state->stream, buffer);
    netstring_fflush(state->stream);
    if (count_deliveries) {
    counter++;
    vstream_printf("%d\r", counter);
    vstream_fflush(VSTREAM_OUT);
    }
    disconnect(state);
}

/* read_data - read over-all netstring data */

static void read_data(int unused_event, void *context)
{
    SINK_STATE *state = (SINK_STATE *) context;
    int     fd = vstream_fileno(state->stream);
    int     count;

    /*
     * Refill the VSTREAM buffer, if necessary.
     */
    if (VSTREAM_GETC(state->stream) == VSTREAM_EOF)
    netstring_except(state->stream, vstream_ftimeout(state->stream) ?
             NETSTRING_ERR_TIME : NETSTRING_ERR_EOF);
    state->count--;

    /*
     * Flush the VSTREAM buffer. As documented, vstream_fseek() discards
     * unread input.
     */
    if ((count = vstream_peek(state->stream)) > 0) {
    state->count -= count;
    if (state->count <= 0) {
        send_reply(state);
        return;
    }
    vstream_fpurge(state->stream, VSTREAM_PURGE_BOTH);
    }

    /*
     * Do not block while waiting for the arrival of more data.
     */
    event_disable_readwrite(fd);
    event_enable_read(fd, read_data, context);
}

/* read_length - read over-all netstring length */

static void read_length(int event, void *context)
{
    SINK_STATE *state = (SINK_STATE *) context;

    switch (vstream_setjmp(state->stream)) {

    default:
    msg_panic("unknown error reading input");

    case NETSTRING_ERR_TIME:
    msg_panic("attempt to read non-readable socket");
    /* NOTREACHED */

    case NETSTRING_ERR_EOF:
    msg_warn("lost connection");
    disconnect(state);
    return;

    case NETSTRING_ERR_FORMAT:
    msg_warn("netstring format error");
    disconnect(state);
    return;

    case NETSTRING_ERR_SIZE:
    msg_warn("netstring size error");
    disconnect(state);
    return;

    /*
     * Include the netstring terminator in the read byte count. This
     * violates abstractions.
     */
    case 0:
    state->count = netstring_get_length(state->stream) + 1;
    read_data(event, context);
    return;
    }
}

/* disconnect - handle disconnection events */

static void disconnect(SINK_STATE *state)
{
    event_disable_readwrite(vstream_fileno(state->stream));
    vstream_fclose(state->stream);
    myfree((void *) state);
}

/* connect_event - handle connection events */

static void connect_event(int unused_event, void *context)
{
    int     sock = CAST_ANY_PTR_TO_INT(context);
    struct sockaddr_storage ss;
    SOCKADDR_SIZE len = sizeof(ss);
    struct sockaddr *sa = (struct sockaddr *) &ss;
    SINK_STATE *state;
    int     fd;

    if ((fd = accept(sock, sa, &len)) >= 0) {
    if (msg_verbose)
        msg_info("connect (%s)",
#ifdef AF_LOCAL
             sa->sa_family == AF_LOCAL ? "AF_LOCAL" :
#else
             sa->sa_family == AF_UNIX ? "AF_UNIX" :
#endif
             sa->sa_family == AF_INET ? "AF_INET" :
#ifdef AF_INET6
             sa->sa_family == AF_INET6 ? "AF_INET6" :
#endif
             "unknown protocol family");
    non_blocking(fd, NON_BLOCKING);
    state = (SINK_STATE *) mymalloc(sizeof(*state));
    state->stream = vstream_fdopen(fd, O_RDWR);
    vstream_tweak_sock(state->stream);
    netstring_setup(state->stream, var_tmout);
    event_enable_read(fd, read_length, (void *) state);
    }
}

/* terminate - voluntary exit */

static void terminate(int unused_event, void *unused_context)
{
    exit(0);
}

/* usage - explain */

static void usage(char *myname)
{
    msg_fatal("usage: %s [-cv] [-x time] [host]:port backlog", myname);
}

MAIL_VERSION_STAMP_DECLARE;

int     main(int argc, char **argv)
{
    int     sock;
    int     backlog;
    int     ch;
    int     ttl;
    const char *protocols = INET_PROTO_NAME_ALL;

    /*
     * Fingerprint executables and core dumps.
     */
    MAIL_VERSION_STAMP_ALLOCATE;

    /*
     * Fix 20051207.
     */
    signal(SIGPIPE, SIG_IGN);

    /*
     * Initialize diagnostics.
     */
    msg_vstream_init(argv[0], VSTREAM_ERR);

    /*
     * Parse JCL.
     */
    while ((ch = GETOPT(argc, argv, "46cvx:")) > 0) {
    switch (ch) {
    case '4':
        protocols = INET_PROTO_NAME_IPV4;
        break;
    case '6':
        protocols = INET_PROTO_NAME_IPV6;
        break;
    case 'c':
        count_deliveries++;
        break;
    case 'v':
        msg_verbose++;
        break;
    case 'x':
        if ((ttl = atoi(optarg)) <= 0)
        usage(argv[0]);
        event_request_timer(terminate, (void *) 0, ttl);
        break;
    default:
        usage(argv[0]);
    }
    }
    if (argc - optind != 2)
    usage(argv[0]);
    if ((backlog = atoi(argv[optind + 1])) <= 0)
    usage(argv[0]);

    /*
     * Initialize.
     */
    (void) inet_proto_init("protocols", protocols);
    buffer = vstring_alloc(1024);
    if (strncmp(argv[optind], "unix:", 5) == 0) {
    sock = unix_listen(argv[optind] + 5, backlog, BLOCKING);
    } else {
    if (strncmp(argv[optind], "inet:", 5) == 0)
        argv[optind] += 5;
    sock = inet_listen(argv[optind], backlog, BLOCKING);
    }

    /*
     * Start the event handler.
     */
    event_enable_read(sock, connect_event, CAST_INT_TO_VOID_PTR(sock));
    for (;;)
    event_loop(-1);
}