/*
* Copyright (c) 2001-2003
* Fraunhofer Institute for Open Communication Systems (FhG Fokus).
* All rights reserved.
*
* Author: Harti Brandt <harti@freebsd.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Begemot: libunimsg/sscop/common.c,v 1.5 2005/05/23 11:46:16 brandt_h Exp $
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/uio.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <time.h>
#include <signal.h>
#include <assert.h>
#include <fcntl.h>
#include <err.h>
#include <netnatm/unimsg.h>
#include <netnatm/saal/sscop.h>
#include "common.h"
struct timer {
evTimerID id;
struct sscop *sscop;
void (*func)(void *);
};
int useframe;
int sscopframe;
u_int sscop_vflag;
int sscop_fd;
int user_fd;
int loose;
int user_out_fd;
u_int verbose;
#ifndef USE_LIBBEGEMOT
evContext evctx;
#endif
evFileID sscop_h;
evFileID user_h;
/*
* This function get's called from sscop to put out verbose messages
*/
void
sscop_verbose(struct sscop *sscop __unused, void *u __unused,
const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
fprintf(stderr, "\n");
va_end(ap);
}
void
verb(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
fprintf(stderr, "\n");
va_end(ap);
}
/*
* Dump a buffer in hex to stderr.
*/
void
dump_buf(const char *w, const u_char *buf, size_t len)
{
u_int i;
fprintf(stderr, "%s %zu: ", w, len);
for(i = 0; i < len; i++) {
if (i % 4 == 0 && i != 0)
fprintf(stderr, " ");
fprintf(stderr, "%02x", *buf++);
}
fprintf(stderr, "\n");
}
/*
* SSCOP file descriptor is ready. Allocate and read one message
* and dispatch a signal.
*/
struct uni_msg *
proto_msgin(int fd __unused)
{
struct uni_msg *m = NULL;
ssize_t size;
u_int32_t flen;
u_int got;
if (sscopframe) {
if ((size = read(sscop_fd, &flen, 4)) == -1)
err(1, "error reading frame hdr");
if (size == 0) {
got = 0;
goto eof;
}
if (size != 4)
errx(1, "short frame header: %zd", size);
if ((m = uni_msg_alloc(flen)) == NULL)
err(1, NULL);
for (got = 0; got < flen; got += (size_t)size) {
size = read(sscop_fd, m->b_rptr + got, flen - got);
if (size == -1)
err(1, "error reading frame");
if (size == 0) {
got = 0;
break;
}
}
} else {
if ((m = uni_msg_alloc(MAXMSG)) == NULL)
err(1, NULL);
if ((size = read(sscop_fd, m->b_rptr, MAXMSG)) == -1)
err(1, "error reading message");
got = size;
}
if (got == 0) {
eof:
#ifdef USE_LIBBEGEMOT
poll_unregister(sscop_h);
#else
evDeselectFD(evctx, sscop_h);
#endif
(void)close(sscop_fd);
sscop_fd = -1;
if (m != NULL)
uni_msg_destroy(m);
VERBOSE(("EOF on sscop file descriptor"));
return (NULL);
}
m->b_wptr = m->b_rptr + got;
if(verbose & 0x0002)
dump_buf("SSCOP INPUT", m->b_rptr, got);
return (m);
}
/*
* User file descriptor ready - read a message
*/
struct uni_msg *
user_msgin(int fd __unused)
{
struct uni_msg *m = NULL;
ssize_t size;
u_int32_t flen;
u_int got;
if (useframe) {
if ((size = read(user_fd, &flen, 4)) == -1)
err(1, "error reading frame hdr");
if (size == 0) {
got = 0;
goto eof;
}
if (size != 4)
errx(1, "short frame header: %zd", size);
if ((m = uni_msg_alloc(flen)) == NULL)
err(1, NULL);
for (got = 0; got < flen; got++) {
size = read(user_fd, m->b_rptr + got, flen - got);
if (size == -1)
err(1, "error reading frame");
if (size == 0) {
got = 0;
break;
}
got += (size_t)size;
}
} else {
if ((m = uni_msg_alloc(MAXMSG)) == NULL)
err(1, NULL);
if ((size = read(user_fd, m->b_rptr, MAXMSG)) == -1)
err(1, "error reading message");
got = size;
}
if (size == 0) {
eof:
#ifdef USE_LIBBEGEMOT
poll_unregister(user_h);
#else
evDeselectFD(evctx, user_h);
#endif
if (m != NULL)
uni_msg_destroy(m);
VERBOSE(("EOF on user connection"));
return (NULL);
}
m->b_wptr = m->b_rptr + size;
return (m);
}
/*
* Write message to the SSCOP file descriptor.
* Here we have a problem: we should have a means to check how much space
* we have. If the pipe is full, we could declare the lower layer busy and
* drop the message. However, how do we know, when a message will fit?
* Selecting for WRITE doesn't help, because it will return even if a single
* byte can be written. For this reason, we switch the file descriptor to
* blocking mode, and hope everything is fast enough to not timeout us.
* Alternatively we could just drop the message. Using kevent would help here.
*/
void
proto_msgout(struct uni_msg *m)
{
struct iovec iov[2];
u_int32_t flen;
ssize_t size;
static int sent;
int fl;
if (verbose & 0x0002)
dump_buf("send", m->b_rptr, uni_msg_len(m));
if (loose > 0 && (sent++ % loose) == loose - 1) {
VERBOSE(("loosing message"));
uni_msg_destroy(m);
return;
}
flen = uni_msg_len(m);
iov[0].iov_len = sscopframe ? 4 : 0;
iov[0].iov_base = (caddr_t)&flen;
iov[1].iov_len = uni_msg_len(m);
iov[1].iov_base = m->b_rptr;
if ((fl = fcntl(sscop_fd, F_GETFL, 0)) == -1)
err(1, "cannot get flags for sscop fd");
fl &= ~O_NONBLOCK;
if (fcntl(sscop_fd, F_SETFL, fl) == -1)
err(1, "cannot set flags for sscop fd");
if ((size = writev(sscop_fd, iov, 2)) == -1)
err(1, "write sscop");
if ((size_t)size != iov[0].iov_len + iov[1].iov_len)
err(1, "short sscop write %zu %zu %zd",
iov[0].iov_len, iov[1].iov_len, size);
fl |= O_NONBLOCK;
if (fcntl(sscop_fd, F_SETFL, fl) == -1)
err(1, "cannot restore flags for sscop fd");
uni_msg_destroy(m);
}
/*
* output a message to the user
*/
void
user_msgout(struct uni_msg *m)
{
struct iovec iov[2];
u_int32_t flen;
ssize_t size;
flen = uni_msg_len(m);
iov[0].iov_len = useframe ? 4 : 0;
iov[0].iov_base = (caddr_t)&flen;
iov[1].iov_len = uni_msg_len(m);
iov[1].iov_base = m->b_rptr;
if ((size = writev(user_out_fd, iov, 2)) == -1)
err(1, "write sscop");
if ((size_t)size != iov[0].iov_len + iov[1].iov_len)
errx(1, "short sscop write");
uni_msg_destroy(m);
}
void
parse_param(struct sscop_param *param, u_int *pmask, int opt, char *arg)
{
u_int val;
char *end, *p;
if(opt == 'b') {
param->flags |= SSCOP_ROBUST;
*pmask |= SSCOP_SET_ROBUST;
return;
}
if(opt == 'x') {
param->flags |= SSCOP_POLLREX;
*pmask |= SSCOP_SET_POLLREX;
return;
}
if(opt == 'W') {
val = (u_int)strtoul(optarg, &end, 0);
if(*end != '\0')
errx(1, "bad number to -W '%s'", optarg);
if(val >= (1 << 24) - 1)
errx(1, "window too large: 0x%x", val);
param->mr = val;
*pmask |= SSCOP_SET_MR;
return;
}
if((p = strchr(arg, '=')) == NULL)
errx(1, "need '=' in argument to -%c", opt);
*p++ = 0;
if(*p == 0)
errx(1, "argument to -%c %s empty", opt, arg);
val = strtoul(p, &end, 0);
if(*end != 0)
errx(1, "bad number in -%c %s=%s", opt, arg, p);
if(opt == 't') {
if(strcmp(arg, "cc") == 0) {
param->timer_cc = val;
*pmask |= SSCOP_SET_TCC;
} else if(strcmp(arg, "poll") == 0) {
param->timer_poll = val;
*pmask |= SSCOP_SET_TPOLL;
} else if(strcmp(arg, "ka") == 0) {
param->timer_keep_alive = val;
*pmask |= SSCOP_SET_TKA;
} else if(strcmp(arg, "nr") == 0) {
param->timer_no_response = val;
*pmask |= SSCOP_SET_TNR;
} else if(strcmp(arg, "idle") == 0) {
param->timer_idle = val;
*pmask |= SSCOP_SET_TIDLE;
} else
errx(1, "bad timer name '%s'", arg);
return;
}
if(opt == 'a') {
if(strcmp(arg, "j") == 0) {
param->maxj = val;
*pmask |= SSCOP_SET_MAXJ;
} else if(strcmp(arg, "k") == 0) {
param->maxk = val;
*pmask |= SSCOP_SET_MAXK;
} else if(strcmp(arg, "cc") == 0) {
param->maxcc = val;
*pmask |= SSCOP_SET_MAXCC;
} else if(strcmp(arg, "pd") == 0) {
param->maxpd = val;
*pmask |= SSCOP_SET_MAXPD;
} else if(strcmp(arg, "stat") == 0) {
param->maxstat = val;
*pmask |= SSCOP_SET_MAXSTAT;
} else
errx(1, "bad parameter '%s'", arg);
return;
}
verb("bad flag");
abort();
}
#ifdef USE_LIBBEGEMOT
static void
tfunc(int tid __unused, void *uap)
#else
static void
tfunc(evContext ctx __unused, void *uap, struct timespec due __unused,
struct timespec inter __unused)
#endif
{
struct timer *t = uap;
t->func(t->sscop);
free(t);
}
/*
* Start a timer
*/
void *
sscop_start_timer(struct sscop *sscop, void *arg __unused, u_int msec,
void (*func)(void *))
{
struct timer *t;
#ifndef USE_LIBBEGEMOT
struct timespec due;
#endif
if ((t = malloc(sizeof(*t))) == NULL)
err(1, NULL);
t->sscop = sscop;
t->func = func;
#ifdef USE_LIBBEGEMOT
if ((t->id = poll_start_timer(msec, 0, tfunc, t)) == -1)
err(1, "cannot start timer");
#else
due = evAddTime(evNowTime(),
evConsTime((time_t)msec/1000, (long)(msec%1000)*1000));
if (evSetTimer(evctx, tfunc, t, due, evConsTime(0, 0), &t->id))
err(1, "cannot start timer");
#endif
return (t);
}
/*
* Stop a timer
*/
void
sscop_stop_timer(struct sscop *sscop __unused, void *arg __unused, void *tp)
{
struct timer *t = tp;
#ifdef USE_LIBBEGEMOT
poll_stop_timer(t->id);
#else
evClearTimer(evctx, t->id);
#endif
free(t);
}
