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C

// SPDX-License-Identifier: GPL-3.0-or-later
/**
* \file peerindex.c
*
* `peerindex` main entry point and general command line parsing.
*
* \copyright The DoubleFourteen Code Forge (C) All Rights Reserved
* \author Lorenzo Cogotti
*/
#include "peerindex_local.h"
#include "bgp/bytebuf.h"
#include "cpr/flate.h"
#include "cpr/bzip2.h"
#include "cpr/xz.h"
#include "sys/endian.h"
#include "sys/fs.h"
#include "sys/con.h"
#include "sys/sys.h"
#include "argv.h"
#include "bufio.h"
#include "strlib.h"
#include <assert.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#define BYTEBUFSIZ (256 * 1024)
typedef enum {
ONLY_REFS_FLAG,
OUTPUT_FLAG,
NUM_FLAGS
} PeerindexOpt;
static Optflag options[] = {
[ONLY_REFS_FLAG] = {
'r', "only-refs", NULL, "Only dump peers referenced by RIBs", ARG_NONE
},
[OUTPUT_FLAG] = {
'o', NULL, "file", "Write output to file", ARG_REQ
},
[NUM_FLAGS] = { '\0' }
};
static PeerindexState S;
static BGP_FIXBYTEBUF(BYTEBUFSIZ) bgp_msgBuf = { BYTEBUFSIZ };
static void Peerindex_SetupCommandLine(char *argv0)
{
Sys_StripPath(argv0, NULL);
Sys_StripFileExtension(argv0, NULL);
com_progName = argv0;
com_synopsis = "[OPTIONS...] [FILES...]";
com_shortDescr = "MRT TABLE_DUMPV2 Peer Index Table inspection tool";
com_longDescr =
"Reads MRT dumps in various formats, and inspects the\n"
"MRT TABLE_DUMPV2 peer index table, and prints it to stdout.\n"
"If - is found inside FILES, then input is read from stdin.\n"
"If no FILES arguments are provided, then input\n"
"is implicitly expected from stdin.\n"
"Any diagnostic message is logged to stderr.";
}
static void Peerindex_Fatal(const char *fmt, ...)
{
va_list va;
Sys_Print(STDERR, com_progName);
Sys_Print(STDERR, ": ERROR: ");
va_start(va, fmt);
Sys_VPrintf(STDERR, fmt, va);
va_end(va);
Sys_Print(STDERR, "\n");
exit(EXIT_FAILURE);
}
static void Peerindex_Warning(const char *fmt, ...)
{
va_list va;
Sys_Print(STDERR, com_progName);
Sys_Print(STDERR, ": ");
if (S.filename) {
Sys_Print(STDERR, S.filename);
Sys_Print(STDERR, ": ");
}
Sys_Print(STDERR, "WARNING: ");
va_start(va, fmt);
Sys_VPrintf(STDERR, fmt, va);
va_end(va);
Sys_Print(STDERR, "\n");
}
void Peerindex_DropRecord(const char *fmt, ...)
{
va_list va;
Sys_Print(STDERR, com_progName);
Sys_Print(STDERR, ": ");
assert(S.filename);
Sys_Print(STDERR, S.filename);
Sys_Print(STDERR, ": ");
va_start(va, fmt);
Sys_VPrintf(STDERR, fmt, va);
va_end(va);
Sys_Print(STDERR, "\n");
S.nerrors++;
// If we're dropping a record we have to kill S.rec
Bgp_ClearMrt(&S.rec);
// ...but don't drop PEER_INDEX_TABLE
longjmp(S.dropRecordFrame, 1);
}
void Peerindex_DropFile(const char *fmt, ...)
{
va_list va;
Sys_Print(STDERR, com_progName);
Sys_Print(STDERR, ": ");
assert(S.filename);
Sys_Print(STDERR, S.filename);
Sys_Print(STDERR, ": ");
va_start(va, fmt);
Sys_VPrintf(STDERR, fmt, va);
va_end(va);
Sys_Print(STDERR, "\n");
S.nerrors++;
// Must clear PEER_INDEX_TABLE also, along with S.rec...
Bgp_ClearMrt(&S.rec);
Bgp_ClearMrt(&S.peerIndex);
S.hasPeerIndex = FALSE;
// Drop any opened file and jump out
if (S.infOps) {
if (S.infOps->Close) S.infOps->Close(S.inf);
S.inf = NULL;
S.infOps = NULL;
}
S.filename = NULL;
longjmp(S.dropFileFrame, 1);
}
NOINLINE static void Peerindex_HandleError(BgpRet err, Srcloc *loc, void *obj)
{
USED(obj);
// On out of memory we die with an appropriate backtrace
if (err == BGPENOMEM) {
loc->call_depth++; // include this function itself
_Sys_OutOfMemory(loc->filename, loc->func, loc->line, loc->call_depth);
}
// On I/O error we drop the entire file
if (err == BGPEIO)
Peerindex_DropFile("I/O error while reading MRT dump"); // TODO: better diagnostics
// Hopefully we are not dealing with a programming error...
assert(err != BGPEBADMRTTYPE);
assert(BGP_ISMRTERR(err));
if (err == BGPEBADPEERIDXCNT || err == BGPEBADRIBV2CNT) {
// Only warrant a warning
Peerindex_Warning("CORRUPT MRT RECORD: %s", Bgp_ErrorString(err));
S.nerrors++;
return;
}
// Anything else requires a full record drop
Peerindex_DropRecord("SKIPPING MRT RECORD: %s", Bgp_ErrorString(err));
}
static void Peerindex_ApplyProgramOptions(void)
{
if (options[ONLY_REFS_FLAG].flagged)
S.peerIndexClearVal = 0;
else
S.peerIndexClearVal = 0xff; // so we always print the full table
if (options[OUTPUT_FLAG].flagged) {
const char *filename = options[OUTPUT_FLAG].optarg;
Fildes fd = Sys_Fopen(filename, FM_WRITE, /*hints=*/0);
if (fd == FILDES_BAD)
Peerindex_Fatal("Can't open output file \"%s\"", filename);
S.outf = STM_FILDES(fd);
S.outfOps = Stm_FildesOps;
} else {
S.outf = STM_CONHN(STDOUT);
S.outfOps = Stm_ConOps;
}
}
static void Peerindex_Init(void)
{
S.rec.allocp = &bgp_msgBuf;
S.rec.memOps = Mem_BgpBufOps;
}
static void Peerindex_OpenMrtDump(const char *filename)
{
S.filename = filename;
if (strcmp(S.filename, "-") == 0) {
// Direct read from stdin, assume uncompressed
S.inf = STM_FILDES(CON_FILDES(STDIN));
S.infOps = Stm_NcFildesOps;
return;
}
Fildes fh = Sys_Fopen(filename, FM_READ, FH_SEQ);
if (fh == FILDES_BAD)
Peerindex_DropFile("Can't open file");
const char *ext = Sys_GetFileExtension(filename);
if (Df_stricmp(ext, ".bz2") == 0) {
S.inf = Bzip2_OpenDecompress(STM_FILDES(fh), Stm_FildesOps, /*opts=*/NULL);
S.infOps = Bzip2_StmOps;
Bzip2Ret err = Bzip2_GetErrStat();
if (err)
Peerindex_DropFile("Can't read Bz2 archive: %s", Bzip2_ErrorString(err));
} else if (Df_stricmp(ext, ".gz") == 0 || Df_stricmp(ext, ".z") == 0) {
S.inf = Zlib_InflateOpen(STM_FILDES(fh), Stm_FildesOps, /*opts=*/NULL);
S.infOps = Zlib_StmOps;
ZlibRet err = Zlib_GetErrStat();
if (err)
Peerindex_DropFile("Can't read Zlib archive: %s", Zlib_ErrorString(err));
} else if (Df_stricmp(ext, ".xz") == 0) {
S.inf = Xz_OpenDecompress(STM_FILDES(fh), Stm_FildesOps, /*opts=*/NULL);
S.infOps = Xz_StmOps;
XzRet err = Xz_GetErrStat();
if (err)
Peerindex_DropFile("Can't read LZMA archive: %s", Xz_ErrorString(err));
} else {
// Assume uncompressed file
S.inf = STM_FILDES(fh);
S.infOps = Stm_FildesOps;
}
}
static void Peerindex_MarkPeerRefs(void)
{
Mrtribiterv2 it;
Mrtribentv2 *rib;
Bgp_StartMrtRibEntriesv2(&it, &S.rec);
while ((rib = Bgp_NextRibEntryv2(&it)) != NULL) {
Uint16 idx = beswap16(rib->peerIndex);
if (idx >= S.npeers) {
Peerindex_Warning("CORRUPT MRT RECORD: Peer index '%u' is out of range", (unsigned) idx);
S.nerrors++;
continue;
}
MARKPEERINDEX(S.peerIndexRefs, idx);
}
}
static void Peerindex_FlushPeerIndexTable(void)
{
char buf[IPV6_STRLEN + 1];
Stmbuf sb;
Ipadr adr;
Mrtpeeriterv2 it;
Mrtpeerentv2 *peer;
if (!S.hasPeerIndex)
return; // NOP
Uint16 idx = 0;
Bufio_Init(&sb, S.outf, S.outfOps);
Bgp_StartMrtPeersv2(&it, &S.peerIndex);
while ((peer = Bgp_NextMrtPeerv2(&it)) != NULL) {
if (ISPEERINDEXREF(S.peerIndexRefs, idx)) {
Asn asn = MRT_GETPEERADDR(&adr, peer);
char *eptr = Ip_AdrToString(&adr, buf);
Bufio_Putsn(&sb, buf, eptr - buf);
Bufio_Putc(&sb, ' ');
Bufio_Putu(&sb, beswap32(ASN(asn)));
Bufio_Putc(&sb, '|');
Bufio_Putc(&sb, ISASN32BIT(asn) ? '1' : '0');
Bufio_Putc(&sb, '\n');
}
idx++;
}
Bufio_Flush(&sb);
}
static void Peerindex_ProcessRecord(void)
{
const Mrthdr *hdr = MRT_HDR(&S.rec);
if (hdr->type != MRT_TABLE_DUMPV2)
return; // don't care for anything else
if (hdr->subtype == TABLE_DUMPV2_PEER_INDEX_TABLE) {
// Dump peers seen so far, if any
Peerindex_FlushPeerIndexTable();
// Clear previous PEER_INDEX_TABLE, if any
Bgp_ClearMrt(&S.peerIndex);
// Clear reference table...
memset(S.peerIndexRefs, S.peerIndexClearVal, sizeof(S.peerIndexRefs));
//...and update current PEER_INDEX_TABLE
size_t npeers;
MRT_MOVEREC(&S.peerIndex, &S.rec);
Bgp_GetMrtPeerIndexPeers(&S.peerIndex, &npeers, /*nbytes=*/NULL);
S.npeers = npeers;
S.hasPeerIndex = TRUE;
return;
}
if (!TABLE_DUMPV2_ISRIB(hdr->subtype))
return; // irrelevant to us
if (!S.hasPeerIndex)
Peerindex_DropRecord("SKIPPING TABLE_DUMPV2 RECORD - No PEER_INDEX_TABLE found yet");
Peerindex_MarkPeerRefs();
}
static void Peerindex_ProcessMrtDump(const char *filename)
{
// NOTE: This call is responsible to set:
// S.filename, S.inf, S.infOps.
// These must be cleared either here or within a file drop.
Peerindex_OpenMrtDump(filename);
setjmp(S.dropRecordFrame); // NOTE: The ONLY place where this is set
while (Bgp_ReadMrt(&S.rec, S.inf, S.infOps) == OK) {
Peerindex_ProcessRecord();
Bgp_ClearMrt(&S.rec);
}
Peerindex_FlushPeerIndexTable(); // execute the very last dump
// Don't need PEER_INDEX_TABLE anymore
Bgp_ClearMrt(&S.peerIndex);
S.hasPeerIndex = FALSE;
// Finally close file and call it a day
if (S.infOps->Close) S.infOps->Close(S.inf);
S.inf = NULL;
S.infOps = NULL;
S.filename = NULL;
}
int main(int argc, char **argv)
{
#ifndef NDEBUG
Sys_SetErrFunc(SYS_ERR_ABORT, NULL);
#else
Sys_SetErrFunc(SYS_ERR_QUIT, NULL);
#endif
Bgp_SetErrFunc(Peerindex_HandleError, NULL);
Peerindex_SetupCommandLine(argv[0]);
int optind = Com_ArgParse(argc, argv, options, /*flags=*/0);
if (optind == OPT_HELP)
return EXIT_SUCCESS; // only called to get help...
if (optind < 0)
return EXIT_FAILURE; // can't parse command line
Peerindex_ApplyProgramOptions();
Peerindex_Init(); // initialize according to command line
// Done with options
argc -= optind;
argv += optind;
// Move to filtering rules and compile them
if (argc == 0) {
// If no FILES are provided, read from stdin
static const char *const stdinFile[] = { "-" };
argv = (char **) stdinFile;
argc = ARRAY_SIZE(stdinFile);
}
volatile int i = 0;
setjmp(S.dropFileFrame); // NOTE: The ONLY place where this is set
while (i < argc)
Peerindex_ProcessMrtDump(argv[i++]);
if (S.outfOps->Close) S.outfOps->Close(S.outf);
return (S.nerrors > 0) ? EXIT_FAILURE : EXIT_SUCCESS;
}