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|
/* Debuginfo file server.
Copyright (C) 2019 Red Hat, Inc.
This file is part of elfutils.
This file is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
elfutils is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
/* cargo-cult from libdwfl linux-kernel-modules.c */
/* In case we have a bad fts we include this before config.h because it
can't handle _FILE_OFFSET_BITS.
Everything we need here is fine if its declarations just come first.
Also, include sys/types.h before fts. On some systems fts.h is not self
contained. */
#ifdef BAD_FTS
#include <sys/types.h>
#include <fts.h>
#endif
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "printversion.h"
#include "dbgserver-client.h"
#include <dwarf.h>
#include <argp.h>
#include <unistd.h>
#include <stdlib.h>
#include <error.h>
#include <libintl.h>
#include <locale.h>
#include <regex.h>
#include <pthread.h>
#include <signal.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <unistd.h>
#include <fcntl.h>
#include <netdb.h>
/* If fts.h is included before config.h, its indirect inclusions may not
give us the right LFS aliases of these functions, so map them manually. */
#ifdef BAD_FTS
#ifdef _FILE_OFFSET_BITS
#define open open64
#define fopen fopen64
#endif
#else
#include <sys/types.h>
#include <fts.h>
#endif
#include <cstring>
#include <vector>
#include <string>
#include <iostream>
#include <ostream>
#include <sstream>
// #include <algorithm>
using namespace std;
#include <gelf.h>
#include <libdwelf.h>
#include <microhttpd.h>
#include <curl/curl.h>
#include <archive.h>
#include <archive_entry.h>
#include <sqlite3.h>
#ifdef __linux__
#include <sys/syscall.h>
#endif
#ifndef _
# define _(str) gettext (str)
#endif
// Roll this identifier for every sqlite schema incompatiblity
// XXX: garbage collect and/or migrate from previous-version tables
#define BUILDIDS "buildids3"
static const char DBGSERVER_SQLITE_DDL[] =
"pragma foreign_keys = on;\n"
"pragma synchronous = 0;\n" // disable fsync()s - this cache is disposable across a machine crash
"pragma journal_mode = wal;\n" // https://sqlite.org/wal.html
/* Normalized tables to represent general buildid-to-file/subfile mapping. */
"create table if not exists " BUILDIDS "_files (\n"
" id integer primary key not null,\n"
" name text unique not null);\n"
"create table if not exists " BUILDIDS "_buildids (\n"
" id integer primary key not null,\n"
" hex text unique not null);\n"
"create table if not exists " BUILDIDS "_norm (\n"
" buildid integer,\n"
" artifacttype text\n" // -- D(ebug) E(xecutable) S(source)
" check (artifacttype IS NULL or artifacttype IN ('D', 'E', 'S')),\n"
" artifactsrc integer\n" // DWARF /path/to/source
" check (artifacttype NOT IN ('S') OR artifactsrc is not null),\n"
" mtime integer,\n" // -- epoch timestamp when we last found this source0
" sourcetype text(1) not null\n"
" check (sourcetype IN ('F', 'R')),\n" // -- as per --source-TYPE single-char code\n"
" source0 integer not null,\n"
" source1 integer,\n"
" foreign key (artifactsrc) references " BUILDIDS "_files(id) on update cascade on delete cascade,\n"
" foreign key (source0) references " BUILDIDS "_files(id) on update cascade on delete cascade,\n"
" foreign key (buildid) references " BUILDIDS "_buildids(id) on update cascade on delete cascade,\n"
" foreign key (source1) references " BUILDIDS "_files(id) on update cascade on delete cascade,\n"
" unique (buildid, artifacttype, artifactsrc, sourcetype, source0) on conflict replace);\n"
/* and now for a FULL OUTER JOIN emulation */
"create view if not exists " BUILDIDS " as select\n"
" b.hex as buildid, n.artifacttype, f3.name as artifactsrc, n.mtime, n.sourcetype, f1.name as source0, f2.name as source1\n"
" from " BUILDIDS "_buildids b, " BUILDIDS "_norm n, " BUILDIDS "_files f1, " BUILDIDS "_files f2, " BUILDIDS "_files f3\n"
" where b.id = n.buildid and f1.id = n.source0 and f2.id = n.source1 and f3.id = n.artifactsrc\n"
"union all select\n"
" b.hex as buildid, n.artifacttype, null, n.mtime, n.sourcetype, f1.name as source0, f2.name as source1\n"
" from " BUILDIDS "_buildids b, " BUILDIDS "_norm n, " BUILDIDS "_files f1, " BUILDIDS "_files f2\n"
" where b.id = n.buildid and f1.id = n.source0 and f2.id = n.source1 and n.artifactsrc is null\n"
"union all select\n"
" b.hex as buildid, n.artifacttype, f3.name, n.mtime, n.sourcetype, f1.name as source0, null\n"
" from " BUILDIDS "_buildids b, " BUILDIDS "_norm n, " BUILDIDS "_files f1, " BUILDIDS "_files f3\n"
" where b.id = n.buildid and f1.id = n.source0 and n.source1 is null and f3.id = n.artifactsrc\n"
"union all select\n"
" b.hex as buildid, n.artifacttype, null, n.mtime, n.sourcetype, f1.name as source0, null\n"
" from " BUILDIDS "_buildids b, " BUILDIDS "_norm n, " BUILDIDS "_files f1\n"
" where b.id = n.buildid and f1.id = n.source0 and n.source1 is null and n.artifactsrc is null\n"
"union all select\n" // negative hit
" null, null, null, n.mtime, n.sourcetype, f1.name as source0, null\n"
" from " BUILDIDS "_norm n, " BUILDIDS "_files f1\n"
" where n.buildid is null and f1.id = n.source0;\n"
"create index if not exists " BUILDIDS "_idx1 on " BUILDIDS "_norm (buildid, artifacttype);\n"
"create index if not exists " BUILDIDS "_idx2 on " BUILDIDS "_norm (mtime, sourcetype, source0);\n"
/* BUILDIDS semantics:
buildid atype/asrc mtime stype source0 source1
$BUILDID D/E $TIME F $FILE -- normal hit: executable or debuinfo file
$BUILDID S $SRC $TIME F $FILE -- normal hit: source file (FILE actual location, SRC dwarf)
$BUILDID D/E $TIME R $RPM $FILE -- normal hit: executable or debuinfo file in rpm RPM file FILE
$BUILDID S $SRC $TIME R $RPM $FILE -- normal hit: source file (RPM rpm, FILE content, SRC dwarf)
$TIME F/R $FILE -- negative hit: bad file known to be unrescanworthy at $TIME
\-----------/ \----------/ UNIQUE
*/
/* Denormalized table for source be-on-the-lookup mappings. Denormalized because it's a temporary table:
in steady state it's empty. */
"create table if not exists " BUILDIDS "_bolo (\n"
" buildid integer not null,\n"
" srcname text not null,\n"
" sourcetype text(1) not null\n"
" check (sourcetype IN ('F', 'R')),\n" // -- as per --source-TYPE single-char code\n"
" dirname text not null,\n"
" unique (buildid, srcname, sourcetype, dirname) on conflict ignore);\n"
"create index if not exists " BUILDIDS "_bolo_idx1 on " BUILDIDS "_bolo (sourcetype, dirname);\n"
/*
BUILDIDS_bolo semantics:
$BUILDID $SRC F $DIR -- source BOLO: recently looking for dwarf SRC mentioned under fts-$DIR
$BUILDID $SRC R $DIR -- source BOLO: recently looking for dwarf SRC mentioned under fts-$DIR
*/
;
// schema change history
//
// buildid2*: normalize buildid and filenames into interning tables; split out srcfile BOLO
//
// buildid1: make buildid and artifacttype NULLable, to represent cached-negative
// lookups from sources, e.g. files or rpms that contain no buildid-indexable content
//
// buildid: original
/*
ISSUES:
- delegated server: recursion/loop; Via: header processing
https://blog.cloudflare.com/preventing-malicious-request-loops/
- access control ===>> delegate to reverse proxy
- running real server for rhel/rhsm probably unnecessary
(use subscription-delegation)
- need a thread to garbage-collect old buildid_norm / _buildid / _files entries?
- inotify based file scanning
see also:
https://github.com/NixOS/nixos-channel-scripts/blob/master/index-debuginfo.cc
https://github.com/edolstra/dwarffs
*/
/* Name and version of program. */
/* ARGP_PROGRAM_VERSION_HOOK_DEF = print_version; */
/* Bug report address. */
ARGP_PROGRAM_BUG_ADDRESS_DEF = PACKAGE_BUGREPORT;
/* Definitions of arguments for argp functions. */
static const struct argp_option options[] =
{
{ NULL, 0, NULL, 0, N_("Sources:"), 1 },
{ "source-files", 'F', "PATH", 0, N_("Scan ELF/DWARF files under given directory."), 0 },
{ "source-rpms", 'R', "PATH", 0, N_("Scan RPM files under given directory."), 0 },
// { "source-rpms-yum", 0, "SECONDS", 0, N_("Try fetching missing RPMs from yum."), 0 },
// "source-rpms-koji" ... no can do, not buildid-addressable
// http traversal for rpm downloading?
// "source-oci-imageregistry" ...
{ NULL, 0, NULL, 0, N_("Options:"), 2 },
{ "rescan-time", 't', "SECONDS", 0, N_("Number of seconds to wait between rescans."), 0 },
{ "port", 'p', "NUM", 0, N_("HTTP port to listen on."), 0 },
{ "database", 'd', "FILE", 0, N_("Path to sqlite database."), 0 },
{ "verbose", 'v', NULL, 0, N_("Increase verbosity."), 0 },
{ NULL, 0, NULL, 0, NULL, 0 }
};
/* Short description of program. */
static const char doc[] = N_("Serve debuginfo-related content across HTTP.");
/* Strings for arguments in help texts. */
static const char args_doc[] = N_("[--source-TYPE...]");
/* Prototype for option handler. */
static error_t parse_opt (int key, char *arg, struct argp_state *state);
/* Data structure to communicate with argp functions. */
static struct argp argp =
{
options, parse_opt, args_doc, doc, NULL, NULL, NULL
};
static string db_path;
static sqlite3 *db;
static unsigned verbose;
static volatile sig_atomic_t interrupted = 0;
static unsigned http_port;
static unsigned rescan_s = 300;
static vector<string> source_file_paths;
static vector<pthread_t> source_file_scanner_threads;
static vector<string> source_rpm_paths;
static vector<pthread_t> source_rpm_scanner_threads;
/* Handle program arguments. */
static error_t
parse_opt (int key, char *arg,
struct argp_state *state __attribute__ ((unused)))
{
switch (key)
{
case 'v': verbose ++; break;
case 'd': db_path = string(arg); break;
case 'p': http_port = atoi(arg); break;
case 'F': source_file_paths.push_back(string(arg)); break;
case 'R': source_rpm_paths.push_back(string(arg)); break;
case 't': rescan_s = atoi(arg); break;
// case 'h': argp_state_help (state, stderr, ARGP_HELP_LONG|ARGP_HELP_EXIT_OK);
default: return ARGP_ERR_UNKNOWN;
}
return 0;
}
////////////////////////////////////////////////////////////////////////
// represent errors that may get reported to an ostream and/or a libmicrohttpd connection
struct reportable_exception
{
int code;
string message;
reportable_exception(int code, const string& message): code(code), message(message) {}
reportable_exception(const string& message): code(503), message(message) {}
reportable_exception(): code(503), message() {}
void report(ostream& o) const; // defined under obatched() class below
int mhd_send_response(MHD_Connection* c) const {
MHD_Response* r = MHD_create_response_from_buffer (message.size(),
(void*) message.c_str(),
MHD_RESPMEM_MUST_COPY);
int rc = MHD_queue_response (c, code, r);
MHD_destroy_response (r);
return rc;
}
};
struct sqlite_exception: public reportable_exception
{
sqlite_exception(int rc, const string& msg):
reportable_exception(string("sqlite3 error: ") + msg + ": " + string(sqlite3_errstr(rc) ?: "?")) {}
};
struct libc_exception: public reportable_exception
{
libc_exception(int rc, const string& msg):
reportable_exception(string("libc error: ") + msg + ": " + string(strerror(rc) ?: "?")) {}
};
struct archive_exception: public reportable_exception
{
archive_exception(const string& msg):
reportable_exception(string("libarchive error: ") + msg) {}
archive_exception(struct archive* a, const string& msg):
reportable_exception(string("libarchive error: ") + msg + ": " + string(archive_error_string(a) ?: "?")) {}
};
struct elfutils_exception: public reportable_exception
{
elfutils_exception(int rc, const string& msg):
reportable_exception(string("elfutils error: ") + msg + ": " + string(elf_errmsg(rc) ?: "?")) {}
};
////////////////////////////////////////////////////////////////////////
// RAII style sqlite prepared-statement holder that matches { } block lifetime
struct sqlite_ps
{
private:
sqlite3_stmt *pp;
sqlite_ps(const sqlite_ps&); // make uncopyable
sqlite_ps& operator=(const sqlite_ps &); // make unassignable
public:
sqlite_ps (sqlite3* db, const string& sql) {
int rc = sqlite3_prepare_v2 (db, sql.c_str(), -1 /* to \0 */, & this->pp, NULL);
if (rc != SQLITE_OK)
throw sqlite_exception(rc, "prepare " + sql);
}
~sqlite_ps () { sqlite3_finalize (this->pp); }
operator sqlite3_stmt* () { return this->pp; }
};
////////////////////////////////////////////////////////////////////////
// RAII style templated autocloser
template <class Payload, class Ignore>
struct defer_dtor
{
public:
typedef Ignore (*dtor_fn) (Payload);
private:
Payload p;
dtor_fn fn;
public:
defer_dtor(Payload _p, dtor_fn _fn): p(_p), fn(_fn) {}
~defer_dtor() { (void) (*fn)(p); }
private:
defer_dtor(const defer_dtor<Payload,Ignore>&); // make uncopyable
defer_dtor& operator=(const defer_dtor<Payload,Ignore> &); // make unassignable
};
////////////////////////////////////////////////////////////////////////
// Lightweight wrapper for pthread_mutex_t
struct my_lock_t
{
private:
pthread_mutex_t _lock;
public:
my_lock_t() { pthread_mutex_init(& this->_lock, NULL); }
~my_lock_t() { pthread_mutex_destroy (& this->_lock); }
void lock() { pthread_mutex_lock (& this->_lock); }
void unlock() { pthread_mutex_unlock (& this->_lock); }
private:
my_lock_t(const my_lock_t&); // make uncopyable
my_lock_t& operator=(my_lock_t const&); // make unassignable
};
// RAII style mutex holder that matches { } block lifetime
struct locker
{
public:
locker(my_lock_t *_m): m(_m) { m->lock(); }
~locker() { m->unlock(); }
private:
my_lock_t* m;
};
////////////////////////////////////////////////////////////////////////
// Print a standard timestamp.
static ostream&
timestamp (ostream &o)
{
time_t now;
time (&now);
char *now2 = ctime (&now);
if (now2) {
now2[19] = '\0'; // overwrite \n
}
return o << "[" << (now2 ? now2 : "") << "] "
<< "(" << getpid ()
#ifdef __linux__
<< "/" << syscall(SYS_gettid)
#else
<< "/" << pthread_self()
#endif
<< "): ";
// XXX: tid() too
}
// A little class that impersonates an ostream to the extent that it can
// take << streaming operations. It batches up the bits into an internal
// stringstream until it is destroyed; then flushes to the original ostream.
// It adds a timestamp
class obatched
{
private:
ostream& o;
stringstream stro;
static my_lock_t lock;
public:
obatched(ostream& oo, bool timestamp_p = true): o(oo)
{
if (timestamp_p)
timestamp(stro);
}
~obatched()
{
locker do_not_cross_the_streams(& obatched::lock);
o << stro.str();
o.flush();
}
operator ostream& () { return stro; }
template <typename T> ostream& operator << (const T& t) { stro << t; return stro; }
};
my_lock_t obatched::lock; // just the one, since cout/cerr iostreams are not thread-safe
void reportable_exception::report(ostream& o) const {
obatched(o) << message << endl;
}
////////////////////////////////////////////////////////////////////////
static string
conninfo (struct MHD_Connection * conn)
{
char hostname[128];
char servname[128];
int sts = -1;
if (conn == 0)
return "internal";
/* Look up client address data. */
const union MHD_ConnectionInfo *u = MHD_get_connection_info (conn,
MHD_CONNECTION_INFO_CLIENT_ADDRESS);
struct sockaddr *so = u ? u->client_addr : 0;
if (so && so->sa_family == AF_INET) {
sts = getnameinfo (so, sizeof (struct sockaddr_in), hostname, sizeof (hostname), servname,
sizeof (servname), NI_NUMERICHOST | NI_NUMERICSERV);
} else if (so && so->sa_family == AF_INET6) {
sts = getnameinfo (so, sizeof (struct sockaddr_in6), hostname, sizeof (hostname),
servname, sizeof (servname), NI_NUMERICHOST | NI_NUMERICSERV);
}
if (sts != 0) {
hostname[0] = servname[0] = '\0';
}
return string(hostname) + string(":") + string(servname);
}
////////////////////////////////////////////////////////////////////////
static void
add_mhd_last_modified (struct MHD_Response *resp, time_t mtime)
{
struct tm *now = gmtime (&mtime);
if (now != NULL)
{
char datebuf[80];
size_t rc = strftime (datebuf, sizeof (datebuf), "%a, %d %b %Y %T GMT", now);
if (rc > 0 && rc < sizeof (datebuf))
(void) MHD_add_response_header (resp, "Last-Modified", datebuf);
}
(void) MHD_add_response_header (resp, "Cache-Control", "public");
}
static struct MHD_Response*
handle_buildid_f_match (int64_t b_mtime,
const string& b_source0)
{
int fd = open(b_source0.c_str(), O_RDONLY);
if (fd < 0)
{
if (verbose > 2)
obatched(clog) << "cannot open " << b_source0 << endl;
// XXX: delete the buildid record?
// NB: it is safe to delete while a select loop is under way
return 0;
}
// NB: use manual close(2) in error case instead of defer_dtor, because
// in the normal case, we want to hand the fd over to libmicrohttpd for
// file transfer.
struct stat s;
int rc = fstat(fd, &s);
if (rc < 0)
{
if (verbose > 2)
clog << "cannot fstat " << b_source0 << endl;
close(fd);
// XXX: delete the buildid record?
// NB: it is safe to delete while a select loop is under way
return 0;
}
if ((int64_t) s.st_mtime != b_mtime)
{
if (verbose > 2)
obatched(clog) << "mtime mismatch for " << b_source0 << endl;
close(fd);
return 0;
}
struct MHD_Response* r = MHD_create_response_from_fd ((uint64_t) s.st_size, fd);
if (r == 0)
{
if (verbose > 2)
clog << "cannot create fd-response for " << b_source0 << endl;
close(fd);
}
else
{
add_mhd_last_modified (r, s.st_mtime);
if (verbose)
obatched(clog) << "serving file " << b_source0 << endl;
/* libmicrohttpd will close it. */
}
return r;
}
static struct MHD_Response*
handle_buildid_r_match (int64_t b_mtime,
const string& b_source0,
const string& b_source1)
{
string popen_cmd = string("/usr/bin/rpm2cpio " + /* XXX sh-meta-escape */ b_source0);
FILE* fp = popen (popen_cmd.c_str(), "r"); // "e" O_CLOEXEC?
if (fp == NULL)
throw libc_exception (errno, string("popen ") + popen_cmd);
defer_dtor<FILE*,int> fp_closer (fp, pclose);
struct archive *a;
a = archive_read_new();
if (a == NULL)
throw archive_exception("cannot create archive reader");
defer_dtor<struct archive*,int> archive_closer (a, archive_read_free);
int rc = archive_read_support_format_cpio(a);
if (rc != ARCHIVE_OK)
throw archive_exception(a, "cannot select cpio format");
rc = archive_read_support_filter_all(a); // XXX: or _none()? are these cpio's compressed at this point?
if (rc != ARCHIVE_OK)
throw archive_exception(a, "cannot select all filters");
rc = archive_read_open_FILE (a, fp);
if (rc != ARCHIVE_OK)
throw archive_exception(a, "cannot open archive from rpm2cpio pipe");
while(1) // parse cpio archive entries
{
struct archive_entry *e;
rc = archive_read_next_header (a, &e);
if (rc != ARCHIVE_OK)
break;
if (! S_ISREG(archive_entry_mode (e))) // skip non-files completely
continue;
string fn = archive_entry_pathname (e);
if (fn != b_source1)
continue;
// extract this file to a temporary file
char tmppath[PATH_MAX] = "/tmp/dbgserver.XXXXXX"; // XXX: $TMP_DIR etc.
int fd = mkstemp (tmppath);
if (fd < 0)
throw libc_exception (errno, "cannot create temporary file");
unlink (tmppath); // unlink now so OS will release the file as soon as we close the fd
rc = archive_read_data_into_fd (a, fd);
if (rc != ARCHIVE_OK)
{
close (fd);
throw archive_exception(a, "cannot extract file");
}
struct MHD_Response* r = MHD_create_response_from_fd (archive_entry_size(e), fd);
if (r == 0)
{
if (verbose > 2)
clog << "cannot create fd-response for " << b_source0 << endl;
close(fd);
}
else
{
add_mhd_last_modified (r, archive_entry_mtime(e));
if (verbose)
obatched(clog) << "serving rpm " << b_source0 << " file " << b_source1 << endl;
/* libmicrohttpd will close it. */
return r;
}
}
// XXX: rpm/file not found: drop this R entry?
return 0;
}
static struct MHD_Response*
handle_buildid_match (int64_t b_mtime,
const string& b_stype,
const string& b_source0,
const string& b_source1)
{
if (b_stype == "F")
return handle_buildid_f_match(b_mtime, b_source0);
else if (b_stype == "R")
return handle_buildid_r_match(b_mtime, b_source0, b_source1);
else
return 0;
}
static struct MHD_Response* handle_buildid (struct MHD_Connection *connection,
const string& buildid /* unsafe */,
const string& artifacttype /* unsafe */,
const string& suffix /* unsafe */)
{
// validate artifacttype
string atype_code;
if (artifacttype == "debuginfo") atype_code = "D";
else if (artifacttype == "executable") atype_code = "E";
else if (artifacttype == "source") atype_code = "S";
else throw reportable_exception("invalid artifacttype");
if (atype_code == "S" && suffix == "")
throw reportable_exception("invalid source suffix");
// validate buildid
if ((buildid.size() < 2) || // not empty
(buildid.size() % 2) || // even number
(buildid.find_first_not_of("0123456789abcdef") != string::npos)) // pure tasty lowercase hex
throw reportable_exception("invalid buildid");
if (verbose)
obatched(clog) << "searching for buildid=" << buildid << " artifacttype=" << artifacttype
<< " suffix=" << suffix << endl;
sqlite_ps pp (db,
(atype_code == "S")
? ("select mtime, sourcetype, source0, source1 " // NB: 4 columns
"from " BUILDIDS " where buildid = ? and artifacttype = ? and artifactsrc = ?"
" order by mtime desc;")
: ("select mtime, sourcetype, source0, source1 " // NB: 4 columns
"from " BUILDIDS " where buildid = ? and artifacttype = ? and artifactsrc is null"
" order by mtime desc;"));
int rc = sqlite3_bind_text (pp, 1, buildid.c_str(), -1 /* to \0 */, SQLITE_TRANSIENT);
if (rc != SQLITE_OK)
throw sqlite_exception(rc, "bind 1");
rc = sqlite3_bind_text (pp, 2, atype_code.c_str(), -1 /* to \0 */, SQLITE_TRANSIENT);
if (rc != SQLITE_OK)
throw sqlite_exception(rc, "bind 2");
if (atype_code == "S") // source
rc = sqlite3_bind_text (pp, 3, suffix.c_str(), -1 /* to \0 */, SQLITE_TRANSIENT);
if (rc != SQLITE_OK)
throw sqlite_exception(rc, "bind 3");
// consume all the rows
while (1)
{
rc = sqlite3_step (pp);
if (rc == SQLITE_DONE) break;
if (rc != SQLITE_ROW)
throw sqlite_exception(rc, "step");
int64_t b_mtime = sqlite3_column_int64 (pp, 0);
string b_stype = string((const char*) sqlite3_column_text (pp, 1) ?: ""); /* by DDL may not be NULL */
string b_source0 = string((const char*) sqlite3_column_text (pp, 2) ?: ""); /* may be NULL */
string b_source1 = string((const char*) sqlite3_column_text (pp, 3) ?: ""); /* may be NULL */
if (verbose > 1)
obatched(clog) << "found mtime=" << b_mtime << " stype=" << b_stype
<< " source0=" << b_source0 << " source1=" << b_source1 << endl;
// Try accessing the located match.
// XXX: validate the mtime against that in the column
// XXX: in case of multiple matches, attempt them in parallel?
auto r = handle_buildid_match (b_mtime, b_stype, b_source0, b_source1);
if (r)
return r;
}
// We couldn't find it in the database. Last ditch effort
// is to defer to other debuginfo servers.
int fd = -1;
if (artifacttype == "debuginfo")
fd = dbgserver_find_debuginfo ((const unsigned char*) buildid.c_str(), 0,
NULL);
else if (artifacttype == "executable")
fd = dbgserver_find_executable ((const unsigned char*) buildid.c_str(), 0,
NULL);
else if (artifacttype == "source")
fd = dbgserver_find_source ((const unsigned char*) buildid.c_str(), 0,
suffix.c_str(), NULL);
// XXX: report bad fd
if (fd >= 0)
{
struct stat s;
rc = fstat (fd, &s);
if (rc == 0)
{
auto r = MHD_create_response_from_fd ((uint64_t) s.st_size, fd);
if (r)
{
add_mhd_last_modified (r, s.st_mtime);
if (verbose)
obatched(clog) << "serving file from upstream dbgserver/cache" << endl;
return r; // NB: don't close fd; libmicrohttpd will
}
}
close (fd);
}
throw reportable_exception(MHD_HTTP_NOT_FOUND, "not found");
}
////////////////////////////////////////////////////////////////////////
static struct MHD_Response*
handle_metrics (struct MHD_Connection *connection)
{
throw reportable_exception("not yet implemented 2");
}
////////////////////////////////////////////////////////////////////////
/* libmicrohttpd callback */
static int
handler_cb (void *cls __attribute__ ((unused)),
struct MHD_Connection *connection,
const char *url,
const char *method,
const char *version __attribute__ ((unused)),
const char *upload_data __attribute__ ((unused)),
size_t * upload_data_size __attribute__ ((unused)),
void ** con_cls __attribute__ ((unused)))
{
struct MHD_Response *r = NULL;
string url_copy = url;
if (verbose)
obatched(clog) << conninfo(connection) << " " << method << " " << url << endl;
try
{
if (string(method) != "GET")
throw reportable_exception(400, _("we support GET only"));
/* Start decoding the URL. */
size_t slash1 = url_copy.find('/', 1);
string url1 = url_copy.substr(0, slash1); // ok even if slash1 not found
if (slash1 != string::npos && url1 == "/buildid")
{
size_t slash2 = url_copy.find('/', slash1+1);
if (slash2 == string::npos)
throw reportable_exception(_("/buildid/ webapi error, need buildid"));
string buildid = url_copy.substr(slash1+1, slash2-slash1-1);
size_t slash3 = url_copy.find('/', slash2+1);
string artifacttype, suffix;
if (slash3 == string::npos)
{
artifacttype = url_copy.substr(slash2+1);
suffix = "";
}
else
{
artifacttype = url_copy.substr(slash2+1, slash3-slash2-1);
suffix = url_copy.substr(slash3); // include the slash in the suffix
}
r = handle_buildid(connection, buildid, artifacttype, suffix);
}
else if (url1 == "/metrics")
r = handle_metrics(connection);
else
throw reportable_exception(_("webapi error, unrecognized /operation"));
if (r == 0)
throw reportable_exception(_("internal error, missing response"));
int rc = MHD_queue_response (connection, MHD_HTTP_OK, r);
MHD_destroy_response (r);
return rc;
}
catch (const reportable_exception& e)
{
e.report(clog);
return e.mhd_send_response (connection);
}
}
////////////////////////////////////////////////////////////////////////
// borrowed from src/nm.c get_local_names()
static void
dwarf_extract_source_paths (Elf *elf, GElf_Ehdr* ehdr, Elf_Scn* scn, GElf_Shdr* shdr, vector<string>& debug_sourcefiles)
{
Dwarf* dbg = dwarf_begin_elf (elf, DWARF_C_READ, NULL);
if (dbg == NULL)
return;
Dwarf_Off offset = 0;
Dwarf_Off old_offset;
size_t hsize;
while (dwarf_nextcu (dbg, old_offset = offset, &offset, &hsize, NULL, NULL, NULL) == 0)
{
Dwarf_Die cudie_mem;
Dwarf_Die *cudie = dwarf_offdie (dbg, old_offset + hsize, &cudie_mem);
if (cudie == NULL)
continue;
if (dwarf_tag (cudie) != DW_TAG_compile_unit)
continue;
const char *cuname = dwarf_diename(cudie) ?: "unknown";
Dwarf_Files *files;
size_t nfiles;
if (dwarf_getsrcfiles (cudie, &files, &nfiles) != 0)
continue;
// extract DW_AT_comp_dir to resolve relative file names
const char *comp_dir = "";
const char *const *dirs;
size_t ndirs;
if (dwarf_getsrcdirs (files, &dirs, &ndirs) == 0 &&
dirs[0] != NULL)
comp_dir = dirs[0];
if (verbose > 3)
obatched(clog) << "Searching for sources for cu=" << cuname << " comp_dir=" << comp_dir
<< " #files=" << nfiles << " #dirs=" << ndirs << endl;
for (size_t f = 1; f < nfiles; f++)
{
const char *hat = dwarf_filesrc (files, f, NULL, NULL);
if (hat == NULL)
continue;
string waldo;
if (hat[0] == '/') // absolute
waldo = (string (hat));
else // comp_dir relative
waldo = (string (comp_dir) + string("/") + string (hat));
// NB: this is the 'waldo' that a dbginfo client will have
// to supply for us to give them the file The comp_dir
// prefixing is a definite complication. Otherwise we'd
// have to return a setof comp_dirs (one per CU!) with
// corresponding filesrc[] names, instead of one absolute
// resoved set. Maybe we'll have to do that anyway. XXX
if (verbose > 4)
obatched(clog) << waldo << endl;
debug_sourcefiles.push_back (waldo);
}
}
dwarf_end(dbg);
}
static void
elf_classify (int fd, bool &executable_p, bool &debuginfo_p, string &buildid, vector<string>& debug_sourcefiles)
{
Elf *elf = elf_begin (fd, ELF_C_READ_MMAP_PRIVATE, NULL);
if (elf == NULL)
return;
try // catch our types of errors and clean up the Elf* object
{
if (elf_kind (elf) != ELF_K_ELF)
{
elf_end (elf);
return;
}
GElf_Ehdr ehdr_storage;
GElf_Ehdr *ehdr = gelf_getehdr (elf, &ehdr_storage);
if (ehdr == NULL)
{
elf_end (elf);
return;
}
auto elf_type = ehdr->e_type;
const void *build_id; // elfutils-owned memory
ssize_t sz = dwelf_elf_gnu_build_id (elf, & build_id);
if (sz <= 0)
{
// It's not a diagnostic-worthy error for an elf file to lack build-id.
// It might just be very old.
elf_end (elf);
return;
}
// build_id is a raw byte array; convert to hexadecimal *lowercase*
unsigned char* build_id_bytes = (unsigned char*) build_id;
for (ssize_t idx=0; idx<sz; idx++)
{
buildid += "0123456789abcdef"[build_id_bytes[idx] >> 4];
buildid += "0123456789abcdef"[build_id_bytes[idx] & 0xf];
}
// now decide whether it's an executable - namely, any allocatable section has
// PROGBITS;
if (elf_type == ET_EXEC || elf_type == ET_DYN)
{
size_t shnum;
int rc = elf_getshdrnum (elf, &shnum);
if (rc < 0)
throw elfutils_exception(rc, "getshdrnum");
executable_p = false;
for (size_t sc = 0; sc < shnum; sc++)
{
Elf_Scn *scn = elf_getscn (elf, sc);
if (scn == NULL)
continue;
GElf_Shdr shdr_mem;
GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem);
if (shdr == NULL)
continue;
// allocated (loadable / vm-addr-assigned) section with available content?
if ((shdr->sh_type == SHT_PROGBITS) && (shdr->sh_flags & SHF_ALLOC))
{
if (verbose > 5)
obatched(clog) << "executable due to SHF_ALLOC SHT_PROGBITS sc=" << sc << endl;
executable_p = true;
break; // no need to keep looking for others
}
} // iterate over sections
} // executable_p classification
// now decide whether it's a debuginfo - namely, if it has any .debug* or .zdebug* sections
// logic mostly stolen from fweimer@redhat.com's elfclassify drafts
size_t shstrndx;
int rc = elf_getshdrstrndx (elf, &shstrndx);
if (rc < 0)
throw elfutils_exception(rc, "getshdrstrndx");
Elf_Scn *scn = NULL;
while (true)
{
scn = elf_nextscn (elf, scn);
if (scn == NULL)
break;
GElf_Shdr shdr_storage;
GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_storage);
if (shdr == NULL)
break;
const char *section_name = elf_strptr (elf, shstrndx, shdr->sh_name);
if (section_name == NULL)
break;
if (strncmp(section_name, ".debug_line", 11) == 0 ||
strncmp(section_name, ".zdebug_line", 12) == 0)
{
debuginfo_p = true;
dwarf_extract_source_paths (elf, ehdr, scn, shdr, debug_sourcefiles);
}
else if (strncmp(section_name, ".debug_", 7) == 0 ||
strncmp(section_name, ".zdebug_", 8) == 0)
{
debuginfo_p = true;
// NB: don't break; need to parse .debug_line for sources
}
}
}
catch (const reportable_exception& e)
{
e.report(clog);
}
elf_end (elf);
}
static void
scan_source_file_path (const string& dir)
{
sqlite_ps ps_upsert_buildids (db, "insert or ignore into " BUILDIDS "_buildids VALUES (NULL, ?);");
sqlite_ps ps_upsert_files (db, "insert or ignore into " BUILDIDS "_files VALUES (NULL, ?);");
sqlite_ps ps_upsert (db,
"insert or replace into " BUILDIDS "_norm "
"(buildid, artifacttype, artifactsrc, mtime, sourcetype, source0) "
"values ((select id from " BUILDIDS "_buildids where hex = ?),"
" ?,"
" (select id from " BUILDIDS "_files where name = ?), ?, 'F',"
" (select id from " BUILDIDS "_files where name = ?));");
sqlite_ps ps_query (db,
"select 1 from " BUILDIDS "_norm where sourcetype = 'F' and source0 = (select id from " BUILDIDS "_files where name = ?) and mtime = ?;");
sqlite_ps ps_cleanup (db, "delete from " BUILDIDS "_norm where mtime < ? and sourcetype = 'F' and source0 = (select id from " BUILDIDS "_files where name = ?);");
// find the source BOLOs
sqlite_ps ps_bolo_insert (db, "insert or ignore into " BUILDIDS "_bolo values (?, ?, 'F', ?);");
sqlite_ps ps_bolo_find (db, "select buildid,srcname from " BUILDIDS "_bolo where sourcetype = 'F' and dirname = ?;");
sqlite_ps ps_bolo_nuke (db, "delete from " BUILDIDS "_bolo where sourcetype = 'F' and dirname = ?;");
char * const dirs[] = { (char*) dir.c_str(), NULL };
struct timeval tv_start, tv_end;
unsigned fts_scanned=0, fts_cached=0, fts_debuginfo=0, fts_executable=0, fts_sourcefiles=0;
gettimeofday (&tv_start, NULL);
FTS *fts = fts_open (dirs,
FTS_PHYSICAL /* don't follow symlinks */
| FTS_XDEV /* don't cross devices/mountpoints */
| FTS_NOCHDIR /* multithreaded */,
NULL);
if (fts == NULL)
{
obatched(cerr) << "cannot fts_open " << dir << endl;
return;
}
vector<string> directory_stack; // to allow knowledge of fts $DIR
FTSENT *f;
while ((f = fts_read (fts)) != NULL)
{
fts_scanned ++;
if (interrupted)
break;
if (verbose > 3)
obatched(clog) << "fts traversing " << f->fts_path << endl;
try
{
/* Found a file. Convert it to an absolute path, so
the buildid database does not have relative path
names that are unresolvable from a subsequent run
in a different cwd. */
char *rp = realpath(f->fts_path, NULL);
if (rp == NULL)
throw libc_exception(errno, "fts realpath " + string(f->fts_path));
string rps = string(rp);
free (rp);
int rc = 0;
switch (f->fts_info)
{
case FTS_D:
directory_stack.push_back (rps);
break;
case FTS_DP:
directory_stack.pop_back ();
// Finished traversing this directory (hierarchy). Check for any source files that can be
// reached from here.
sqlite3_reset (ps_bolo_find);
rc = sqlite3_bind_text (ps_bolo_find, 1, rps.c_str(), -1, SQLITE_TRANSIENT);
if (rc != SQLITE_OK)
throw sqlite_exception(rc, "sqlite3 bolo-find bind1");
while (1)
{
rc = sqlite3_step (ps_bolo_find);
if (rc == SQLITE_DONE)
break;
else if (rc == SQLITE_ROW) // i.e., a result, as opposed to DONE (no results)
{
string buildid = string((const char*) sqlite3_column_text (ps_bolo_find, 0) ?: "NULL"); // NULL can't happen
string dwarfsrc = string((const char*) sqlite3_column_text (ps_bolo_find, 1) ?: "NULL"); // NULL can't happen
string srcpath;
if (dwarfsrc.size() > 0 && dwarfsrc[0] == '/') // src file name is absolute, use as is
srcpath = dwarfsrc;
else
srcpath = rps + string("/") + dwarfsrc; // XXX: should not happen; elf_classify only gives back /absolute files
char *srp = realpath(srcpath.c_str(), NULL);
if (srp == NULL)
continue; // unresolvable files are not a serious problem
// throw libc_exception(errno, "fts realpath " + srcpath);
string srps = string(srp);
free (srp);
struct stat sfs;
rc = stat(srps.c_str(), &sfs);
if (rc == 0)
{
if (verbose > 2)
obatched(clog) << "recorded buildid=" << buildid << " file=" << srps
<< " mtime=" << sfs.st_mtime
<< " as source " << dwarfsrc << endl;
// register this file name in the interning table
sqlite3_reset (ps_upsert_files);
rc = sqlite3_bind_text (ps_upsert_files, 1, srps.c_str(), -1, SQLITE_TRANSIENT);
if (rc != SQLITE_OK)
throw sqlite_exception(rc, "sqlite3 bolo-file bind");
rc = sqlite3_step (ps_upsert_files);
if (rc != SQLITE_OK && rc != SQLITE_DONE)
throw sqlite_exception(rc, "sqlite3 bolo-file execute");
// register the dwarfsrc name in the interning table too
sqlite3_reset (ps_upsert_files);
rc = sqlite3_bind_text (ps_upsert_files, 1, dwarfsrc.c_str(), -1, SQLITE_TRANSIENT);
if (rc != SQLITE_OK)
throw sqlite_exception(rc, "sqlite3 bolo-file bind");
rc = sqlite3_step (ps_upsert_files);
if (rc != SQLITE_OK && rc != SQLITE_DONE)
throw sqlite_exception(rc, "sqlite3 bolo-file execute");
sqlite3_reset (ps_upsert);
rc = sqlite3_bind_text (ps_upsert, 1, buildid.c_str(), -1, SQLITE_TRANSIENT);
if (rc != SQLITE_OK)
throw sqlite_exception(rc, "sqlite3 bolo upsert bind1");
rc = sqlite3_bind_text (ps_upsert, 2, "S", -1, SQLITE_STATIC);
if (rc != SQLITE_OK)
throw sqlite_exception(rc, "sqlite3 bolo upsert bind2");
rc = sqlite3_bind_text (ps_upsert, 3, dwarfsrc.c_str(), -1, SQLITE_TRANSIENT);
if (rc != SQLITE_OK)
throw sqlite_exception(rc, "sqlite3 bolo upsert bind2");
rc = sqlite3_bind_int64 (ps_upsert, 4, (int64_t) sfs.st_mtime);
if (rc != SQLITE_OK)
throw sqlite_exception(rc, "sqlite3 bolo upsert bind3");
rc = sqlite3_bind_text (ps_upsert, 5, srps.c_str(), -1, SQLITE_TRANSIENT);
if (rc != SQLITE_OK)
throw sqlite_exception(rc, "sqlite3 bolo upsert bind3");
rc = sqlite3_step (ps_upsert);
if (rc != SQLITE_OK && rc != SQLITE_DONE)
throw sqlite_exception(rc, "sqlite3 bolo upsert execute");
}
}
else
throw sqlite_exception(rc, "sqlite3 bolo-find step");
} // loop over bolo records
if (verbose > 2)
obatched(clog) << "nuking bolo for directory=" << rps << endl;
// ditch matching bolo records so we don't repeat search
sqlite3_reset (ps_bolo_nuke);
rc = sqlite3_bind_text (ps_bolo_nuke, 1, rps.c_str(), -1, SQLITE_TRANSIENT);
if (rc != SQLITE_OK)
throw sqlite_exception(rc, "sqlite3 bolo-nuke bind1");
rc = sqlite3_step (ps_bolo_nuke);
if (rc != SQLITE_OK && rc != SQLITE_DONE)
throw sqlite_exception(rc, "sqlite3 bolo-nuke execute");
break;
case FTS_F:
{
/* See if we know of it already. */
sqlite3_reset (ps_query); // to allow rebinding / reexecution
int rc = sqlite3_bind_text (ps_query, 1, rps.c_str(), -1, SQLITE_TRANSIENT);
if (rc != SQLITE_OK)
throw sqlite_exception(rc, "sqlite3 file query bind1");
rc = sqlite3_bind_int64 (ps_query, 2, (int64_t) f->fts_statp->st_mtime);
if (rc != SQLITE_OK)
throw sqlite_exception(rc, "sqlite3 file query bind2");
rc = sqlite3_step (ps_query);
if (rc == SQLITE_ROW) // i.e., a result, as opposed to DONE (no results)
// no need to recheck a file/version we already know
// specifically, no need to elf-begin a file we already determined is non-elf
// (so is stored with buildid=NULL)
{
fts_cached ++;
continue;
}
bool executable_p = false, debuginfo_p = false; // E and/or D
string buildid;
vector<string> sourcefiles;
int fd = open (rps.c_str(), O_RDONLY);
try
{
if (fd >= 0)
elf_classify (fd, executable_p, debuginfo_p, buildid, sourcefiles);
else
throw libc_exception(errno, string("open ") + rps);
}
// NB: we catch exceptions from elf_classify here too, so that we can
// cache the corrupt-elf case (!executable_p && !debuginfo_p) just below,
// just as if we had an EPERM error from open(2).
catch (const reportable_exception& e)
{
e.report(clog);
}
if (fd >= 0)
close (fd);
// register this file name in the interning table
sqlite3_reset (ps_upsert_files);
rc = sqlite3_bind_text (ps_upsert_files, 1, rps.c_str(), -1, SQLITE_TRANSIENT);
if (rc != SQLITE_OK)
throw sqlite_exception(rc, "sqlite3 upsert-file bind");
rc = sqlite3_step (ps_upsert_files);
if (rc != SQLITE_OK && rc != SQLITE_DONE)
throw sqlite_exception(rc, "sqlite3 upsert-file execute");
if (buildid == "")
{
sqlite3_reset (ps_upsert); // to allow rebinding / reexecution
rc = sqlite3_bind_null (ps_upsert, 1);
if (rc != SQLITE_OK)
throw sqlite_exception(rc, "sqlite3 upsert bind1");
// no point storing an elf file without buildid
executable_p = false;
debuginfo_p = false;
}
else
{
// register this build-id in the interning table
sqlite3_reset (ps_upsert_buildids);
rc = sqlite3_bind_text (ps_upsert_buildids, 1, buildid.c_str(), -1, SQLITE_TRANSIENT);
if (rc != SQLITE_OK)
throw sqlite_exception(rc, "sqlite3 upsert-buildid bind");
rc = sqlite3_step (ps_upsert_buildids);
if (rc != SQLITE_OK && rc != SQLITE_DONE)
throw sqlite_exception(rc, "sqlite3 upsert-buildid execute");
sqlite3_reset (ps_upsert); // to allow rebinding / reexecution
rc = sqlite3_bind_text (ps_upsert, 1, buildid.c_str(), -1, SQLITE_TRANSIENT);
if (rc != SQLITE_OK)
throw sqlite_exception(rc, "sqlite3 upsert bind1");
}
// artifacttype column 2 set later
rc = sqlite3_bind_null (ps_upsert, 3); // no artifactsrc for D/E
if (rc != SQLITE_OK)
throw sqlite_exception(rc, "sqlite3 upsert bind3");
rc = sqlite3_bind_int64 (ps_upsert, 4, (int64_t) f->fts_statp->st_mtime);
if (rc != SQLITE_OK)
throw sqlite_exception(rc, "sqlite3 upsert bind4");
rc = sqlite3_bind_text (ps_upsert, 5, rps.c_str(), -1, SQLITE_TRANSIENT);
if (rc != SQLITE_OK)
throw sqlite_exception(rc, "sqlite3 upsert bind5");
if (executable_p)
{
fts_executable ++;
rc = sqlite3_bind_text (ps_upsert, 2, "E", -1, SQLITE_STATIC);
if (rc != SQLITE_OK)
throw sqlite_exception(rc, "sqlite3 upsert-E bind2");
rc = sqlite3_step (ps_upsert);
if (rc != SQLITE_OK && rc != SQLITE_DONE)
throw sqlite_exception(rc, "sqlite3 upsert-E execute");
}
if (debuginfo_p)
{
fts_debuginfo ++;
sqlite3_reset (ps_upsert); // to allow rebinding / reexecution
rc = sqlite3_bind_text (ps_upsert, 2, "D", -1, SQLITE_STATIC);
if (rc != SQLITE_OK)
throw sqlite_exception(rc, "sqlite3 upsert-D bind2");
rc = sqlite3_step (ps_upsert);
if (rc != SQLITE_OK && rc != SQLITE_DONE)
throw sqlite_exception(rc, "sqlite3 upsert-D execute");
}
if (sourcefiles.size() && buildid != "")
{
fts_sourcefiles += sourcefiles.size();
string sourcedir = directory_stack.back ();
for (auto sf : sourcefiles)
{
sqlite3_reset (ps_bolo_insert);
rc = sqlite3_bind_text (ps_bolo_insert, 1, buildid.c_str(), -1, SQLITE_TRANSIENT);
if (rc != SQLITE_OK)
throw sqlite_exception(rc, "sqlite3 upsert-bolo bind1");
rc = sqlite3_bind_text (ps_bolo_insert, 2, sf.c_str(), -1, SQLITE_TRANSIENT);
if (rc != SQLITE_OK)
throw sqlite_exception(rc, "sqlite3 upsert-bolo bind2");
rc = sqlite3_bind_text (ps_bolo_insert, 3, sourcedir.c_str(), -1, SQLITE_TRANSIENT);
if (rc != SQLITE_OK)
throw sqlite_exception(rc, "sqlite3 upsert-bolo bind3");
rc = sqlite3_step (ps_bolo_insert);
if (rc != SQLITE_OK && rc != SQLITE_DONE)
throw sqlite_exception(rc, "sqlite3 upsert-bolo execute");
}
}
if (! (executable_p || debuginfo_p)) // negative hit
{
rc = sqlite3_bind_null (ps_upsert, 2);
if (rc != SQLITE_OK)
throw sqlite_exception(rc, "sqlite3 upsert-NULL bind2");
rc = sqlite3_step (ps_upsert);
if (rc != SQLITE_OK && rc != SQLITE_DONE)
throw sqlite_exception(rc, "sqlite3 upsert-NULL execute");
}
// clean up any older entries for this file, in case it was replaced/recompiled to new buildid
sqlite3_reset (ps_cleanup);
rc = sqlite3_bind_int64 (ps_cleanup, 1, (int64_t) f->fts_statp->st_mtime);
if (rc != SQLITE_OK)
throw sqlite_exception(rc, "sqlite3 cleanup bind1");
rc = sqlite3_bind_text (ps_cleanup, 2, rps.c_str(), -1, SQLITE_TRANSIENT);
if (rc != SQLITE_OK)
throw sqlite_exception(rc, "sqlite3 cleanup bind2");
rc = sqlite3_step (ps_cleanup);
if (rc != SQLITE_OK && rc != SQLITE_DONE)
throw sqlite_exception(rc, "sqlite3 cleanup exec");
if (verbose > 2)
obatched(clog) << "recorded buildid=" << buildid << " file=" << rps
<< " mtime=" << f->fts_statp->st_mtime << " as "
<< (executable_p ? "executable" : "not executable") << " and "
<< (debuginfo_p ? "debuginfo" : "not debuginfo") << endl;
// XXX: delete earlier records for the same file (mtime < this_mtime)
}
break;
case FTS_ERR:
case FTS_NS:
throw libc_exception(f->fts_errno, string("fts traversal ") + string(f->fts_path));
default:
case FTS_SL: /* NB: don't enter symbolic links into the database */
break;
}
}
catch (const reportable_exception& e)
{
e.report(clog);
}
}
fts_close (fts);
gettimeofday (&tv_end, NULL);
double deltas = (tv_end.tv_sec - tv_start.tv_sec) + (tv_end.tv_usec - tv_start.tv_usec)*0.000001;
if (verbose > 1)
obatched(clog) << "fts traversed " << dir << " in " << deltas << "s, scanned=" << fts_scanned
<< ", cached=" << fts_cached << ", debuginfo=" << fts_debuginfo
<< ", executable=" << fts_executable << ", source=" << fts_sourcefiles << endl;
}
static void*
thread_main_scan_source_file_path (void* arg)
{
string dir = string((const char*) arg);
if (verbose > 2)
obatched(clog) << "file-path scanning " << dir << endl;
unsigned rescan_timer = 0;
while (! interrupted)
{
try
{
if (rescan_timer == 0)
scan_source_file_path (dir);
}
catch (const sqlite_exception& e)
{
obatched(cerr) << e.message << endl;
}
sleep (1);
rescan_timer ++;
if (rescan_s)
rescan_timer %= rescan_s;
}
return 0;
}
////////////////////////////////////////////////////////////////////////
// Analyze given *.rpm file of given age; record buildids / exec/debuginfo-ness of its
// constituent files with given upsert statement.
static void
rpm_classify (const string& rps, sqlite_ps& ps_upsert, time_t mtime,
unsigned& fts_executable, unsigned& fts_debuginfo)
{
string popen_cmd = string("/usr/bin/rpm2cpio " + /* XXX sh-meta-escape */ rps);
FILE* fp = popen (popen_cmd.c_str(), "r"); // "e" O_CLOEXEC?
if (fp == NULL)
throw libc_exception (errno, string("popen ") + popen_cmd);
defer_dtor<FILE*,int> fp_closer (fp, pclose);
struct archive *a;
a = archive_read_new();
if (a == NULL)
throw archive_exception("cannot create archive reader");
defer_dtor<struct archive*,int> archive_closer (a, archive_read_free);
int rc = archive_read_support_format_cpio(a);
if (rc != ARCHIVE_OK)
throw archive_exception(a, "cannot select cpio format");
rc = archive_read_support_filter_all(a); // XXX: or _none()? are these cpio's compressed at this point?
if (rc != ARCHIVE_OK)
throw archive_exception(a, "cannot select all filters");
rc = archive_read_open_FILE (a, fp);
if (rc != ARCHIVE_OK)
throw archive_exception(a, "cannot open archive from rpm2cpio pipe");
if (verbose > 3)
obatched(clog) << "rpm2cpio|libarchive scanning " << rps << endl;
while(1) // parse cpio archive entries
{
try
{
struct archive_entry *e;
rc = archive_read_next_header (a, &e);
if (rc != ARCHIVE_OK)
break;
if (! S_ISREG(archive_entry_mode (e))) // skip non-files completely
continue;
string fn = archive_entry_pathname (e);
if (verbose > 3)
obatched(clog) << "rpm2cpio|libarchive checking " << fn << endl;
// extract this file to a temporary file
char tmppath[PATH_MAX] = "/tmp/dbgserver.XXXXXX"; // XXX: $TMP_DIR etc.
int fd = mkstemp (tmppath);
if (fd < 0)
throw libc_exception (errno, "cannot create temporary file");
unlink (tmppath); // unlink now so OS will release the file as soon as we close the fd
defer_dtor<int,int> minifd_closer (fd, close);
rc = archive_read_data_into_fd (a, fd);
if (rc != ARCHIVE_OK)
throw archive_exception(a, "cannot extract file");
// finally ... time to run elf_classify on this bad boy and update the database
bool executable_p = false, debuginfo_p = false;
string buildid;
vector<string> sourcefiles;
elf_classify (fd, executable_p, debuginfo_p, buildid, sourcefiles);
// NB: might throw
// NB: we record only executable_p || debuginfo_p case here,
// not the 'neither' case.
sqlite3_reset (ps_upsert); // to allow rebinding / reexecution
rc = sqlite3_bind_text (ps_upsert, 1, buildid.c_str(), -1, SQLITE_TRANSIENT);
if (rc != SQLITE_OK)
throw sqlite_exception(rc, "sqlite3 upsert bind1");
rc = sqlite3_bind_text (ps_upsert, 4, buildid.c_str(), -1, SQLITE_TRANSIENT);
if (rc != SQLITE_OK)
throw sqlite_exception(rc, "sqlite3 upsert bind1");
rc = sqlite3_bind_int64 (ps_upsert, 6, (int64_t) mtime); // XXX: caller could do this for us
if (rc != SQLITE_OK)
throw sqlite_exception(rc, "sqlite3 upsert bind3");
rc = sqlite3_bind_text (ps_upsert, 3, rps.c_str(), -1, SQLITE_TRANSIENT);
if (rc != SQLITE_OK)
throw sqlite_exception(rc, "sqlite3 upsert bind4");
rc = sqlite3_bind_text (ps_upsert, 7, rps.c_str(), -1, SQLITE_TRANSIENT);
if (rc != SQLITE_OK)
throw sqlite_exception(rc, "sqlite3 upsert bind4");
rc = sqlite3_bind_text (ps_upsert, 8, fn.c_str(), -1, SQLITE_TRANSIENT);
if (rc != SQLITE_OK)
throw sqlite_exception(rc, "sqlite3 upsert bind5");
rc = sqlite3_bind_text (ps_upsert, 2, fn.c_str(), -1, SQLITE_TRANSIENT);
if (rc != SQLITE_OK)
throw sqlite_exception(rc, "sqlite3 upsert bind5");
if (executable_p)
{
fts_executable ++;
rc = sqlite3_bind_text (ps_upsert, 5, "E", -1, SQLITE_STATIC);
if (rc != SQLITE_OK)
throw sqlite_exception(rc, "sqlite3 upsert-E bind2");
rc = sqlite3_step (ps_upsert);
if (rc != SQLITE_OK && rc != SQLITE_DONE)
throw sqlite_exception(rc, "sqlite3 upsert-E execute");
}
if (debuginfo_p)
{
fts_debuginfo ++;
sqlite3_reset (ps_upsert); // to allow rebinding / reexecution
rc = sqlite3_bind_text (ps_upsert, 5, "D", -1, SQLITE_STATIC);
if (rc != SQLITE_OK)
throw sqlite_exception(rc, "sqlite3 upsert-D bind2");
rc = sqlite3_step (ps_upsert);
if (rc != SQLITE_OK && rc != SQLITE_DONE)
throw sqlite_exception(rc, "sqlite3 upsert-D execute");
}
if ((verbose > 2) && (executable_p || debuginfo_p))
obatched(clog) << "recorded buildid=" << buildid << " rpm=" << rps << " file=" << fn
<< " mtime=" << mtime << " as "
<< (executable_p ? "executable" : "not executable") << " and "
<< (debuginfo_p ? "debuginfo" : "not debuginfo") << endl;
}
catch (const reportable_exception& e)
{
e.report(clog);
}
}
}
// scan for *.rpm files
static void
scan_source_rpm_path (const string& dir)
{
sqlite_ps ps_upsert (db,
"insert or ignore into " BUILDIDS "_buildids VALUES (NULL, ?);"
"insert or ignore into " BUILDIDS "_files VALUES (NULL, ?);"
"insert or ignore into " BUILDIDS "_files VALUES (NULL, ?);"
"insert or replace into " BUILDIDS "_norm (buildid, artifacttype, mtime," // XXX: artifactsrc
"sourcetype, source0, source1) values ((select id from " BUILDIDS "_buildids where hex = ?), ?, ?, 'F',"
"(select id from " BUILDIDS "_files where name = ?),"
"(select id from " BUILDIDS "_files where name = ?));");
sqlite_ps ps_query (db,
"select 1 from " BUILDIDS " where sourcetype = 'R' and source0 = ? and mtime = ?;");
char * const dirs[] = { (char*) dir.c_str(), NULL };
struct timeval tv_start, tv_end;
unsigned fts_scanned=0, fts_cached=0, fts_debuginfo=0, fts_executable=0, fts_rpm = 0;
gettimeofday (&tv_start, NULL);
FTS *fts = fts_open (dirs,
FTS_PHYSICAL /* don't follow symlinks */
| FTS_XDEV /* don't cross devices/mountpoints */
| FTS_NOCHDIR /* multithreaded */,
NULL);
if (fts == NULL)
{
obatched(cerr) << "cannot fts_open " << dir << endl;
return;
}
FTSENT *f;
while ((f = fts_read (fts)) != NULL)
{
fts_scanned ++;
if (interrupted)
break;
if (verbose > 3)
obatched(clog) << "fts/rpm traversing " << f->fts_path << endl;
try
{
switch (f->fts_info)
{
case FTS_F:
{
/* Found a file. Convert it to an absolute path, so
the buildid database does not have relative path
names that are unresolvable from a subsequent run
in a different cwd. */
char *rp = realpath(f->fts_path, NULL);
if (rp == NULL)
throw libc_exception(errno, "fts realpath " + string(f->fts_path));
string rps = string(rp);
free (rp);
// heuristic: reject if file name does not end with ".rpm"
// (alternative: try opening with librpm etc., caching)
string suffix = ".rpm";
if (rps.size() < suffix.size() ||
rps.substr(rps.size()-suffix.size()) != suffix)
// !equal(rps.begin()+rps.size()-suffix.size(), rps.end(), suffix.begin()))
continue;
fts_rpm ++;
/* See if we know of it already. */
sqlite3_reset (ps_query); // to allow rebinding / reexecution
int rc = sqlite3_bind_text (ps_query, 1, rps.c_str(), -1, SQLITE_TRANSIENT);
if (rc != SQLITE_OK)
throw sqlite_exception(rc, "sqlite3 file query bind1");
rc = sqlite3_bind_int64 (ps_query, 2, (int64_t) f->fts_statp->st_mtime);
if (rc != SQLITE_OK)
throw sqlite_exception(rc, "sqlite3 file query bind2");
rc = sqlite3_step (ps_query);
if (rc == SQLITE_ROW) // i.e., a result, as opposed to DONE (no results)
// no need to recheck a file/version we already know
// specifically, no need to elf-begin a file we already determined is non-elf
// (so is stored with buildid=NULL)
{
fts_cached ++;
continue;
}
// extract the rpm contents via popen("rpm2cpio") | libarchive | loop-of-elf_classify()
unsigned my_fts_executable = 0, my_fts_debuginfo = 0;
try
{
rpm_classify (rps, ps_upsert, f->fts_statp->st_mtime, my_fts_executable, my_fts_debuginfo);
}
catch (const reportable_exception& e)
{
e.report(clog);
}
fts_executable += my_fts_executable;
fts_debuginfo += my_fts_debuginfo;
// unreadable or corrupt or non-ELF-carrying rpm: cache negative
if (my_fts_executable == 0 && my_fts_debuginfo == 0)
{
sqlite3_reset (ps_upsert); // to allow rebinding / reexecution
rc = sqlite3_bind_null (ps_upsert, 1); // buildid
if (rc != SQLITE_OK)
throw sqlite_exception(rc, "sqlite3 upsert-NULL bind1");
rc = sqlite3_bind_null (ps_upsert, 2); // artifacttype
if (rc != SQLITE_OK)
throw sqlite_exception(rc, "sqlite3 upsert-NULL bind2");
rc = sqlite3_bind_int64 (ps_upsert, 3, (int64_t) f->fts_statp->st_mtime); // mtime
if (rc != SQLITE_OK)
throw sqlite_exception(rc, "sqlite3 upsert bind3");
rc = sqlite3_bind_text (ps_upsert, 4, rps.c_str(), -1, SQLITE_TRANSIENT); // source0
if (rc != SQLITE_OK)
throw sqlite_exception(rc, "sqlite3 upsert bind4");
rc = sqlite3_bind_null (ps_upsert, 5); // source1
if (rc != SQLITE_OK)
throw sqlite_exception(rc, "sqlite3 upsert-NULL bind5");
rc = sqlite3_step (ps_upsert);
if (rc != SQLITE_OK && rc != SQLITE_DONE)
throw sqlite_exception(rc, "sqlite3 upsert-NULL execute");
}
}
break;
case FTS_ERR:
case FTS_NS:
throw libc_exception(f->fts_errno, string("fts traversal ") + string(f->fts_path));
default:
case FTS_SL: /* NB: don't enter symbolic links into the database */
break;
}
}
catch (const reportable_exception& e)
{
e.report(clog);
}
}
fts_close (fts);
gettimeofday (&tv_end, NULL);
double deltas = (tv_end.tv_sec - tv_start.tv_sec) + (tv_end.tv_usec - tv_start.tv_usec)*0.000001;
if (verbose > 1)
obatched(clog) << "fts/rpm traversed " << dir << " in " << deltas << "s, scanned=" << fts_scanned
<< ", rpm=" << fts_rpm << ", cached=" << fts_cached << ", debuginfo=" << fts_debuginfo
<< ", executable=" << fts_executable << endl;
}
static void*
thread_main_scan_source_rpm_path (void* arg)
{
string dir = string((const char*) arg);
if (verbose > 2)
obatched(clog) << "rpm-path scanning " << dir << endl;
unsigned rescan_timer = 0;
while (! interrupted)
{
try
{
if (rescan_timer == 0)
scan_source_rpm_path (dir);
}
catch (const sqlite_exception& e)
{
obatched(cerr) << e.message << endl;
}
sleep (1);
rescan_timer ++;
if (rescan_s)
rescan_timer %= rescan_s;
}
return 0;
}
////////////////////////////////////////////////////////////////////////
static void
signal_handler (int /* sig */)
{
interrupted ++;
// NB: don't do anything else in here
}
int
main (int argc, char *argv[])
{
(void) setlocale (LC_ALL, "");
(void) bindtextdomain (PACKAGE_TARNAME, LOCALEDIR);
(void) textdomain (PACKAGE_TARNAME);
/* Tell the library which version we are expecting. */
elf_version (EV_CURRENT);
/* Set default values. */
http_port = 8002;
db_path = string(getenv("HOME") ?: "/") + string("/.dbgserver.sqlite"); /* XDG? */
/* Parse and process arguments. */
int remaining;
(void) argp_parse (&argp, argc, argv, ARGP_IN_ORDER|ARGP_NO_ARGS, &remaining, NULL);
if (remaining != argc)
error (EXIT_FAILURE, 0,
_("unexpected argument: %s"), argv[remaining]);
(void) signal (SIGPIPE, SIG_IGN); // microhttpd can generate it incidentally, ignore
(void) signal (SIGINT, signal_handler); // ^C
(void) signal (SIGHUP, signal_handler); // EOF
(void) signal (SIGTERM, signal_handler); // systemd
/* Get database ready. */
int rc;
rc = sqlite3_open_v2 (db_path.c_str(), &db, (SQLITE_OPEN_READWRITE
|SQLITE_OPEN_CREATE
|SQLITE_OPEN_FULLMUTEX), /* thread-safe */
NULL);
if (rc == SQLITE_CORRUPT)
{
(void) unlink (db_path.c_str());
error (EXIT_FAILURE, 0,
_("cannot open %s, deleted database: %s"), db_path.c_str(), sqlite3_errmsg(db));
}
else if (rc)
{
error (EXIT_FAILURE, 0,
_("cannot open %s, database: %s"), db_path.c_str(), sqlite3_errmsg(db));
}
obatched(clog) << "Opened database " << db_path << endl;
if (verbose > 3)
obatched(clog) << "DDL:\n" << DBGSERVER_SQLITE_DDL << endl;
rc = sqlite3_exec (db, DBGSERVER_SQLITE_DDL, NULL, NULL, NULL);
if (rc != SQLITE_OK)
{
error (EXIT_FAILURE, 0,
_("cannot run database schema ddl: %s"), sqlite3_errmsg(db));
}
if (verbose) // report database stats
try
{
sqlite_ps ps_query (db,
"select sourcetype, artifacttype, count(*) from " BUILDIDS
" group by sourcetype, artifacttype");
obatched(clog) << "Database statistics:" << endl;
obatched(clog) << "source" << "\t" << "type" << "\t" << "count" << endl;
while (1)
{
rc = sqlite3_step (ps_query);
if (rc == SQLITE_DONE) break;
if (rc != SQLITE_ROW)
throw sqlite_exception(rc, "step");
obatched(clog) << (sqlite3_column_text(ps_query, 0) ?: (const unsigned char*) "NULL")
<< "\t"
<< (sqlite3_column_text(ps_query, 1) ?: (const unsigned char*) "NULL")
<< "\t"
<< (sqlite3_column_text(ps_query, 2) ?: (const unsigned char*) "NULL")
<< endl;
}
}
catch (const reportable_exception& e)
{
e.report(clog);
}
for (auto&& it : source_file_paths)
{
pthread_t pt;
int rc = pthread_create (& pt, NULL, thread_main_scan_source_file_path, (void*) it.c_str());
if (rc < 0)
error (0, 0, "Warning: cannot spawn thread (%d) to scan source files %s\n", rc, it.c_str());
else
source_file_scanner_threads.push_back(pt);
}
for (auto&& it : source_rpm_paths)
{
pthread_t pt;
int rc = pthread_create (& pt, NULL, thread_main_scan_source_rpm_path, (void*) it.c_str());
if (rc < 0)
error (0, 0, "Warning: cannot spawn thread (%d) to scan source rpms %s\n", rc, it.c_str());
else
source_rpm_scanner_threads.push_back(pt);
}
// Start httpd server threads. Separate pool for IPv4 and IPv6, in
// case the host only has one protocol stack.
MHD_Daemon *d4 = MHD_start_daemon (MHD_USE_THREAD_PER_CONNECTION
#if MHD_VERSION >= 0x00095300
| MHD_USE_INTERNAL_POLLING_THREAD
#else
| MHD_USE_SELECT_INTERNALLY
#endif
| MHD_USE_DEBUG, /* report errors to stderr */
http_port,
NULL, NULL, /* default accept policy */
handler_cb, NULL, /* handler callback */
MHD_OPTION_END);
MHD_Daemon *d6 = MHD_start_daemon (MHD_USE_THREAD_PER_CONNECTION
#if MHD_VERSION >= 0x00095300
| MHD_USE_INTERNAL_POLLING_THREAD
#else
| MHD_USE_SELECT_INTERNALLY
#endif
| MHD_USE_IPv6
| MHD_USE_DEBUG, /* report errors to stderr */
http_port,
NULL, NULL, /* default accept policy */
handler_cb, NULL, /* handler callback */
MHD_OPTION_END);
if (d4 == NULL && d6 == NULL) // neither ipv4 nor ipv6? boo
{
sqlite3_close (db);
error (EXIT_FAILURE, 0, _("cannot start http server at port %d"), http_port);
}
obatched(clog) << "Started http server on "
<< (d4 != NULL ? "IPv4 " : "")
<< (d6 != NULL ? "IPv6 " : "")
<< "port=" << http_port << endl;
/* Trivial main loop! */
while (! interrupted)
pause ();
if (verbose)
obatched(clog) << "Stopping" << endl;
/* Stop all the web service threads. */
if (d4) MHD_stop_daemon (d4);
if (d6) MHD_stop_daemon (d6);
/* Join any source scanning threads. */
for (auto&& it : source_file_scanner_threads)
pthread_join (it, NULL);
for (auto&& it : source_rpm_scanner_threads)
pthread_join (it, NULL);
/* With all threads known dead, we can close the db handle. */
sqlite3_close (db);
return 0;
}
|