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NetBSD/dist/dhcp/omapip/trace.c

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/* trace.c
Subroutines that support tracing of OMAPI wire transactions and
provide a mechanism for programs using OMAPI to trace their own
transactions... */
/*
* Copyright (c) 2001 Internet Software Consortium.
* All rights reserved.
*
* 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.
* 3. Neither the name of The Internet Software Consortium nor the names
* of its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INTERNET SOFTWARE CONSORTIUM 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 INTERNET SOFTWARE CONSORTIUM 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.
*
* This software has been written for the Internet Software Consortium
* by Ted Lemon, as part of a project for Nominum, Inc. To learn more
* about the Internet Software Consortium, see http://www.isc.org/. To
* learn more about Nominum, Inc., see ``http://www.nominum.com''.
*/
#include <omapip/omapip_p.h>
#if defined (TRACING)
void (*trace_set_time_hook) (u_int32_t);
static int tracing_stopped;
static int traceoutfile;
static int traceindex;
static trace_type_t **trace_types;
static int trace_type_count;
static int trace_type_max;
static trace_type_t *new_trace_types;
static FILE *traceinfile;
static tracefile_header_t tracefile_header;
static int trace_playback_flag;
trace_type_t trace_time_marker;
#if defined (DEBUG_MEMORY_LEAKAGE) || defined (DEBUG_MEMORY_LEAKAGE_ON_EXIT)
extern omapi_array_t *trace_listeners;
extern omapi_array_t *omapi_connections;
void trace_free_all ()
{
trace_type_t *tp;
int i;
tp = new_trace_types;
while (tp) {
new_trace_types = tp -> next;
if (tp -> name) {
dfree (tp -> name, MDL);
tp -> name = (char *)0;
}
dfree (tp, MDL);
tp = new_trace_types;
}
for (i = 0; i < trace_type_count; i++) {
if (trace_types [i]) {
if (trace_types [i] -> name)
dfree (trace_types [i] -> name, MDL);
dfree (trace_types [i], MDL);
}
}
dfree (trace_types, MDL);
trace_types = (trace_type_t **)0;
trace_type_count = trace_type_max = 0;
omapi_array_free (&trace_listeners, MDL);
omapi_array_free (&omapi_connections, MDL);
}
#endif
static isc_result_t trace_type_record (trace_type_t *,
unsigned, const char *, int);
int trace_playback ()
{
return trace_playback_flag;
}
int trace_record ()
{
if (traceoutfile && !tracing_stopped)
return 1;
return 0;
}
isc_result_t trace_init (void (*set_time) (u_int32_t),
const char *file, int line)
{
trace_type_t *root_type;
static int root_setup = 0;
if (root_setup)
return ISC_R_SUCCESS;
trace_set_time_hook = set_time;
root_type = trace_type_register ("trace-index-mapping",
(void *)0, trace_index_map_input,
trace_index_stop_tracing, file, line);
if (!root_type)
return ISC_R_UNEXPECTED;
if (new_trace_types == root_type)
new_trace_types = new_trace_types -> next;
root_type -> index = 0;
trace_type_stash (root_type);
root_setup = 1;
return ISC_R_SUCCESS;
}
isc_result_t trace_begin (const char *filename,
const char *file, int line)
{
tracefile_header_t tfh;
int status;
trace_type_t *tptr, *next;
isc_result_t result;
if (traceoutfile) {
log_error ("%s(%d): trace_begin called twice",
file, line);
return ISC_R_INVALIDARG;
}
traceoutfile = open (filename, O_CREAT | O_WRONLY | O_EXCL, 0644);
if (traceoutfile < 0) {
log_error ("%s(%d): trace_begin: %s: %m",
file, line, filename);
return ISC_R_UNEXPECTED;
}
#if defined (HAVE_SETFD)
if (fcntl (traceoutfile, F_SETFD, 1) < 0)
log_error ("Can't set close-on-exec on %s: %m", filename);
#endif
tfh.magic = htonl (TRACEFILE_MAGIC);
tfh.version = htonl (TRACEFILE_VERSION);
tfh.hlen = htonl (sizeof (tracefile_header_t));
tfh.phlen = htonl (sizeof (tracepacket_t));
status = write (traceoutfile, &tfh, sizeof tfh);
if (status < 0) {
log_error ("%s(%d): trace_begin write failed: %m", file, line);
return ISC_R_UNEXPECTED;
} else if (status != sizeof tfh) {
log_error ("%s(%d): trace_begin: short write (%d:%ld)",
file, line, status, (long)(sizeof tfh));
trace_stop ();
return ISC_R_UNEXPECTED;
}
/* Stash all the types that have already been set up. */
if (new_trace_types) {
next = new_trace_types;
new_trace_types = (trace_type_t *)0;
for (tptr = next; tptr; tptr = next) {
next = tptr -> next;
if (tptr -> index != 0) {
result = (trace_type_record
(tptr,
strlen (tptr -> name), file, line));
if (result != ISC_R_SUCCESS)
return status;
}
}
}
return ISC_R_SUCCESS;
}
isc_result_t trace_write_packet (trace_type_t *ttype, unsigned length,
const char *buf, const char *file, int line)
{
trace_iov_t iov;
iov.buf = buf;
iov.len = length;
return trace_write_packet_iov (ttype, 1, &iov, file, line);
}
isc_result_t trace_write_packet_iov (trace_type_t *ttype,
int count, trace_iov_t *iov,
const char *file, int line)
{
tracepacket_t tmp;
int status;
int i;
int length;
/* Really shouldn't get called here, but it may be hard to turn off
tracing midstream if the trace file write fails or something. */
if (tracing_stopped)
return 0;
if (!ttype) {
log_error ("%s(%d): trace_write_packet with null trace type",
file ? file : "<unknown file>", line);
return ISC_R_INVALIDARG;
}
if (!traceoutfile) {
log_error ("%s(%d): trace_write_packet with no tracefile.",
file ? file : "<unknown file>", line);
return ISC_R_INVALIDARG;
}
/* Compute the total length of the iov. */
length = 0;
for (i = 0; i < count; i++)
length += iov [i].len;
/* We have to swap out the data, because it may be read back on a
machine of different endianness. */
tmp.type_index = htonl (ttype -> index);
tmp.when = htonl (time ((time_t *)0)); /* XXX */
tmp.length = htonl (length);
status = write (traceoutfile, &tmp, sizeof tmp);
if (status < 0) {
log_error ("%s(%d): trace_write_packet write failed: %m",
file, line);
return ISC_R_UNEXPECTED;
} else if (status != sizeof tmp) {
log_error ("%s(%d): trace_write_packet: short write (%d:%ld)",
file, line, status, (long)(sizeof tmp));
trace_stop ();
}
for (i = 0; i < count; i++) {
status = write (traceoutfile, iov [i].buf, iov [i].len);
if (status < 0) {
log_error ("%s(%d): %s write failed: %m",
file, line, "trace_write_packet");
return ISC_R_UNEXPECTED;
} else if (status != iov [i].len) {
log_error ("%s(%d): %s: short write (%d:%d)",
file, line,
"trace_write_packet", status, length);
trace_stop ();
}
}
/* Write padding on the end of the packet to align the next
packet to an 8-byte boundary. This is in case we decide to
use mmap in some clever way later on. */
if (length % 8) {
static char zero [] = { 0, 0, 0, 0, 0, 0, 0 };
unsigned padl = 8 - (length % 8);
status = write (traceoutfile, zero, padl);
if (status < 0) {
log_error ("%s(%d): trace_write_packet write failed: %m",
file, line);
return ISC_R_UNEXPECTED;
} else if (status != padl) {
log_error ("%s(%d): trace_write_packet: short write (%d:%d)",
file, line, status, padl);
trace_stop ();
}
}
return ISC_R_SUCCESS;
}
void trace_type_stash (trace_type_t *tptr)
{
trace_type_t **vec;
int delta;
if (trace_type_max <= tptr -> index) {
delta = tptr -> index - trace_type_max + 10;
vec = dmalloc (((trace_type_max + delta) *
sizeof (trace_type_t *)), MDL);
if (!vec)
return;
memset (&vec [trace_type_max], 0,
(sizeof (trace_type_t *)) * delta);
trace_type_max += delta;
if (trace_types) {
memcpy (vec, trace_types,
trace_type_count * sizeof (trace_type_t *));
dfree (trace_types, MDL);
}
trace_types = vec;
}
trace_types [tptr -> index] = tptr;
if (tptr -> index >= trace_type_count)
trace_type_count = tptr -> index + 1;
}
trace_type_t *trace_type_register (const char *name,
void *baggage,
void (*have_packet) (trace_type_t *,
unsigned, char *),
void (*stop_tracing) (trace_type_t *),
const char *file, int line)
{
trace_type_t *ttmp, *tptr;
unsigned slen = strlen (name);
isc_result_t status;
ttmp = dmalloc (sizeof *ttmp, file, line);
if (!ttmp)
return ttmp;
ttmp -> index = -1;
ttmp -> name = dmalloc (slen + 1, file, line);
if (!ttmp -> name) {
dfree (ttmp, file, line);
return (trace_type_t *)0;
}
strcpy (ttmp -> name, name);
ttmp -> have_packet = have_packet;
ttmp -> stop_tracing = stop_tracing;
if (traceoutfile) {
status = trace_type_record (ttmp, slen, file, line);
if (status != ISC_R_SUCCESS) {
dfree (ttmp -> name, file, line);
dfree (ttmp, file, line);
return (trace_type_t *)0;
}
} else {
ttmp -> next = new_trace_types;
new_trace_types = ttmp;
}
return ttmp;
}
static isc_result_t trace_type_record (trace_type_t *ttmp, unsigned slen,
const char *file, int line)
{
trace_index_mapping_t *tim;
isc_result_t status;
tim = dmalloc (slen + TRACE_INDEX_MAPPING_SIZE, file, line);
if (!tim)
return ISC_R_NOMEMORY;
ttmp -> index = ++traceindex;
trace_type_stash (ttmp);
tim -> index = htonl (ttmp -> index);
memcpy (tim -> name, ttmp -> name, slen);
status = trace_write_packet (trace_types [0],
slen + TRACE_INDEX_MAPPING_SIZE,
(char *)tim, file, line);
dfree (tim, file, line);
return status;
}
/* Stop all registered trace types from trying to trace. */
void trace_stop (void)
{
int i;
for (i = 0; i < trace_type_count; i++)
if (trace_types [i] -> stop_tracing)
(*(trace_types [i] -> stop_tracing))
(trace_types [i]);
tracing_stopped = 1;
}
void trace_index_map_input (trace_type_t *ttype, unsigned length, char *buf)
{
trace_index_mapping_t *tmap;
unsigned len;
trace_type_t *tptr, **prev;
if (length < TRACE_INDEX_MAPPING_SIZE) {
log_error ("short trace index mapping");
return;
}
tmap = (trace_index_mapping_t *)buf;
prev = &new_trace_types;
for (tptr = new_trace_types; tptr; tptr = tptr -> next) {
len = strlen (tptr -> name);
if (len == length - TRACE_INDEX_MAPPING_SIZE &&
!memcmp (tptr -> name, tmap -> name, len)) {
tptr -> index = ntohl (tmap -> index);
trace_type_stash (tptr);
*prev = tptr -> next;
return;
}
prev = &tptr -> next;
}
log_error ("No registered trace type for type name %.*s",
(int)length - TRACE_INDEX_MAPPING_SIZE, tmap -> name);
return;
}
void trace_index_stop_tracing (trace_type_t *ttype) { }
void trace_replay_init (void)
{
trace_playback_flag = 1;
}
void trace_file_replay (const char *filename)
{
tracepacket_t *tpkt = (tracepacket_t *)0;
int status;
char *buf = (char *)0;
unsigned buflen;
unsigned bufmax = 0;
trace_type_t *ttype = (trace_type_t *)0;
isc_result_t result;
int len;
traceinfile = fopen (filename, "r");
if (!traceinfile) {
log_error ("Can't open tracefile %s: %m", filename);
return;
}
#if defined (HAVE_SETFD)
if (fcntl (fileno (traceinfile), F_SETFD, 1) < 0)
log_error ("Can't set close-on-exec on %s: %m", filename);
#endif
status = fread (&tracefile_header, 1,
sizeof tracefile_header, traceinfile);
if (status < sizeof tracefile_header) {
if (ferror (traceinfile))
log_error ("Error reading trace file header: %m");
else
log_error ("Short read on trace file header: %d %ld.",
status, (long)(sizeof tracefile_header));
goto out;
}
tracefile_header.magic = ntohl (tracefile_header.magic);
tracefile_header.version = ntohl (tracefile_header.version);
tracefile_header.hlen = ntohl (tracefile_header.hlen);
tracefile_header.phlen = ntohl (tracefile_header.phlen);
if (tracefile_header.magic != TRACEFILE_MAGIC) {
log_error ("%s: not a dhcp trace file.", filename);
goto out;
}
if (tracefile_header.version > TRACEFILE_VERSION) {
log_error ("tracefile version %ld > current %ld.",
(long int)tracefile_header.version,
(long int)TRACEFILE_VERSION);
goto out;
}
if (tracefile_header.phlen < sizeof *tpkt) {
log_error ("tracefile packet size too small - %ld < %ld",
(long int)tracefile_header.phlen,
(long int)sizeof *tpkt);
goto out;
}
len = (sizeof tracefile_header) - tracefile_header.hlen;
if (len < 0) {
log_error ("tracefile header size too small - %ld < %ld",
(long int)tracefile_header.hlen,
(long int)sizeof tracefile_header);
goto out;
}
if (len > 0) {
status = fseek (traceinfile, (long)len, SEEK_CUR);
if (status < 0) {
log_error ("can't seek past header: %m");
goto out;
}
}
tpkt = dmalloc ((unsigned)tracefile_header.phlen, MDL);
if (!tpkt) {
log_error ("can't allocate trace packet header.");
goto out;
}
while ((result = trace_get_next_packet (&ttype, tpkt, &buf, &buflen,
&bufmax)) == ISC_R_SUCCESS) {
(*ttype -> have_packet) (ttype, tpkt -> length, buf);
ttype = (trace_type_t *)0;
}
out:
fclose (traceinfile);
if (buf)
dfree (buf, MDL);
if (tpkt)
dfree (tpkt, MDL);
}
/* Get the next packet from the file. If ttp points to a nonzero pointer
to a trace type structure, check the next packet to see if it's of the
expected type, and back off if not. */
isc_result_t trace_get_next_packet (trace_type_t **ttp,
tracepacket_t *tpkt,
char **buf, unsigned *buflen,
unsigned *bufmax)
{
trace_type_t *ttype;
unsigned paylen;
int status;
int len;
fpos_t curpos;
status = fgetpos (traceinfile, &curpos);
if (status < 0)
log_error ("Can't save tracefile position: %m");
status = fread (tpkt, 1, (size_t)tracefile_header.phlen, traceinfile);
if (status < tracefile_header.phlen) {
if (ferror (traceinfile))
log_error ("Error reading trace packet header: %m");
else if (status == 0)
return ISC_R_EOF;
else
log_error ("Short read on trace packet header: "
"%ld %ld.",
(long int)status,
(long int)tracefile_header.phlen);
return ISC_R_PROTOCOLERROR;
}
/* Swap the packet. */
tpkt -> type_index = ntohl (tpkt -> type_index);
tpkt -> length = ntohl (tpkt -> length);
tpkt -> when = ntohl (tpkt -> when);
/* See if there's a handler for this packet type. */
if (tpkt -> type_index < trace_type_count &&
trace_types [tpkt -> type_index])
ttype = trace_types [tpkt -> type_index];
else {
log_error ("Trace packet with unknown index %ld",
(long int)tpkt -> type_index);
return ISC_R_PROTOCOLERROR;
}
/* If we were just hunting for the time marker, we've found it,
so back up to the beginning of the packet and return its
type. */
if (ttp && *ttp == &trace_time_marker) {
*ttp = ttype;
status = fsetpos (traceinfile, &curpos);
if (status < 0) {
log_error ("fsetpos in tracefile failed: %m");
return ISC_R_PROTOCOLERROR;
}
return ISC_R_EXISTS;
}
/* If we were supposed to get a particular kind of packet,
check to see that we got the right kind. */
if (ttp && *ttp && ttype != *ttp) {
log_error ("Read packet type %s when expecting %s",
ttype -> name, (*ttp) -> name);
status = fsetpos (traceinfile, &curpos);
if (status < 0) {
log_error ("fsetpos in tracefile failed: %m");
return ISC_R_PROTOCOLERROR;
}
return ISC_R_UNEXPECTEDTOKEN;
}
paylen = tpkt -> length;
if (paylen % 8)
paylen += 8 - (tpkt -> length % 8);
if (paylen > (*bufmax)) {
if ((*buf))
dfree ((*buf), MDL);
(*bufmax) = ((paylen + 1023) & ~1023U);
(*buf) = dmalloc ((*bufmax), MDL);
if (!(*buf)) {
log_error ("Can't allocate input buffer sized %d",
(*bufmax));
return ISC_R_NOMEMORY;
}
}
status = fread ((*buf), 1, paylen, traceinfile);
if (status < paylen) {
if (ferror (traceinfile))
log_error ("Error reading trace payload: %m");
else
log_error ("Short read on trace payload: %d %d.",
status, paylen);
return ISC_R_PROTOCOLERROR;
}
/* Store the actual length of the payload. */
*buflen = tpkt -> length;
if (trace_set_time_hook)
(*trace_set_time_hook) (tpkt -> when);
if (ttp)
*ttp = ttype;
return ISC_R_SUCCESS;
}
isc_result_t trace_get_packet (trace_type_t **ttp,
unsigned *buflen, char **buf)
{
tracepacket_t *tpkt;
unsigned bufmax = 0;
isc_result_t status;
if (!buf || *buf)
return ISC_R_INVALIDARG;
tpkt = dmalloc ((unsigned)tracefile_header.phlen, MDL);
if (!tpkt) {
log_error ("can't allocate trace packet header.");
return ISC_R_NOMEMORY;
}
status = trace_get_next_packet (ttp, tpkt, buf, buflen, &bufmax);
dfree (tpkt, MDL);
return status;
}
time_t trace_snoop_time (trace_type_t **ptp)
{
tracepacket_t *tpkt;
unsigned bufmax = 0;
unsigned buflen = 0;
char *buf = (char *)0;
isc_result_t status;
time_t result;
trace_type_t *ttp;
if (!ptp)
ptp = &ttp;
tpkt = dmalloc ((unsigned)tracefile_header.phlen, MDL);
if (!tpkt) {
log_error ("can't allocate trace packet header.");
return ISC_R_NOMEMORY;
}
*ptp = &trace_time_marker;
trace_get_next_packet (ptp, tpkt, &buf, &buflen, &bufmax);
result = tpkt -> when;
dfree (tpkt, MDL);
return result;
}
/* Get a packet from the trace input file that contains a file with the
specified name. We don't hunt for the packet - it should be the next
packet in the tracefile. If it's not, or something else bad happens,
return an error code. */
isc_result_t trace_get_file (trace_type_t *ttype,
const char *filename, unsigned *len, char **buf)
{
fpos_t curpos;
unsigned max = 0;
tracepacket_t *tpkt;
int status;
isc_result_t result;
/* Disallow some obvious bogosities. */
if (!buf || !len || *buf)
return ISC_R_INVALIDARG;
/* Save file position in case of filename mismatch. */
status = fgetpos (traceinfile, &curpos);
if (status < 0)
log_error ("Can't save tracefile position: %m");
tpkt = dmalloc ((unsigned)tracefile_header.phlen, MDL);
if (!tpkt) {
log_error ("can't allocate trace packet header.");
return ISC_R_NOMEMORY;
}
result = trace_get_next_packet (&ttype, tpkt, buf, len, &max);
if (result != ISC_R_SUCCESS) {
dfree (tpkt, MDL);
if (*buf)
dfree (*buf, MDL);
return result;
}
/* Make sure the filename is right. */
if (strcmp (filename, *buf)) {
log_error ("Read file %s when expecting %s", *buf, filename);
status = fsetpos (traceinfile, &curpos);
if (status < 0) {
log_error ("fsetpos in tracefile failed: %m");
dfree (tpkt, MDL);
dfree (*buf, MDL);
return ISC_R_PROTOCOLERROR;
}
return ISC_R_UNEXPECTEDTOKEN;
}
dfree (tpkt, MDL);
return ISC_R_SUCCESS;
}
#endif /* TRACING */
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