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pseudo_db.c
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pseudo_db.c
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/*
* pseudo_db.c, sqlite3 interface
*
* Copyright (c) 2008-2010 Wind River Systems, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the Lesser GNU General Public License version 2.1 as
* published by the Free Software Foundation.
*
* This program 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 Lesser GNU General Public License for more details.
*
* You should have received a copy of the Lesser GNU General Public License
* version 2.1 along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <time.h>
#include <unistd.h>
#include <sqlite3.h>
#include "pseudo.h"
#include "pseudo_ipc.h"
#include "pseudo_db.h"
/* #define NPROFILE */
#ifdef NPROFILE
void xProfile(void * pArg, const char * pQuery, sqlite3_uint64 pTimeTaken)
{
pseudo_diag("profile: %lld %s\n", pTimeTaken, pQuery);
}
#endif
struct log_history {
int rc;
unsigned long fields;
sqlite3_stmt *stmt;
};
struct pdb_file_list {
int rc;
sqlite3_stmt *stmt;
};
static sqlite3 *file_db = 0;
static sqlite3 *log_db = 0;
/* What's going on here, you might well ask?
* This contains a template to build the database. I suppose maybe it
* should have been elegantly done as a big chunk of embedded SQL, but
* this looked like a good idea at the time.
*/
typedef struct { char *fmt; int arg; } id_row;
/* This seemed like a really good idea at the time. The idea is that these
* structures let me write semi-abstract code to "create a database" without
* duplicating as much of the code.
*/
static struct sql_table {
char *name;
char *sql;
char **names;
id_row *values;
} file_tables[] = {
{ "files",
"id INTEGER PRIMARY KEY, "
"path VARCHAR, "
"dev INTEGER, "
"ino INTEGER, "
"uid INTEGER, "
"gid INTEGER, "
"mode INTEGER, "
"rdev INTEGER",
NULL,
NULL },
{ NULL, NULL, NULL, NULL },
}, log_tables[] = {
{ "logs",
"id INTEGER PRIMARY KEY, "
"stamp INTEGER, "
"op INTEGER, "
"client INTEGER, "
"fd INTEGER, "
"dev INTEGER, "
"ino INTEGER, "
"mode INTEGER, "
"path VARCHAR, "
"result INTEGER, "
"severity INTEGER, "
"text VARCHAR ",
NULL,
NULL },
{ NULL, NULL, NULL, NULL },
};
/* similarly, this creates indexes generically. */
static struct sql_index {
char *name;
char *table;
char *keys;
} file_indexes[] = {
/* { "files__path", "files", "path" }, */
{ "files__path_dev_ino", "files", "path, dev, ino" },
{ "files__dev_ino", "files", "dev, ino" },
{ NULL, NULL, NULL },
}, log_indexes[] = {
{ NULL, NULL, NULL },
};
static char *file_pragmas[] = {
"PRAGMA legacy_file_format = OFF;",
"PRAGMA journal_mode = OFF;",
"PRAGMA locking_mode = EXCLUSIVE;",
/* Setting this to NORMAL makes pseudo noticably slower
* than fakeroot, but is perhaps more secure. However,
* note that sqlite always flushes to the OS; what is lacking
* in non-synchronous mode is waiting for the OS to
* confirm delivery to media, and also a bunch of cache
* flushing and reloading which we probably don't really
* need.
*/
"PRAGMA synchronous = OFF;",
NULL
};
static char *log_pragmas[] = {
"PRAGMA legacy_file_format = OFF;",
"PRAGMA journal_mode = OFF;",
"PRAGMA locking_mode = EXCLUSIVE;",
"PRAGMA synchronous = OFF;",
NULL
};
/* table migrations: */
/* If there is no migration table, we assume "version -1" -- the
* version shipped with wrlinux 3.0, which had no version
* number. Otherwise, we check it for the highest version recorded.
* We then perform, and then record, each migration in sequence.
* The first migration is the migration to create the migrations
* table; this way, it'll work on existing databases. It'll also
* work for new databases -- the migrations get performed in order
* before the databases are considered to be set up.
*/
static char create_migration_table[] =
"CREATE TABLE migrations ("
"id INTEGER PRIMARY KEY, "
"version INTEGER, "
"stamp INTEGER, "
"sql VARCHAR"
");";
static char index_migration_table[] =
"CREATE INDEX migration__version ON migrations (version)";
/* This used to be a { version, sql } pair, but version was always
* the same as index into the table, so I removed it.
* The first migration in each database is migration #0 -- the
* creation of the migration table now being used for versioning.
* The second is indexing on version -- sqlite3 can grab MAX(version)
* faster if it's indexed. (Indexing this table is very cheap, since
* there are very few migrations and each one produces exactly
* one insert.)
*/
static struct sql_migration {
char *sql;
} file_migrations[] = {
{ create_migration_table },
{ index_migration_table },
{ "ALTER TABLE files ADD deleting INTEGER;" },
{ NULL },
}, log_migrations[] = {
{ create_migration_table },
{ index_migration_table },
/* support for hostdeps merge -- this allows us to log "tags"
* along with events.
*/
{ "ALTER TABLE logs ADD tag VARCHAR;" },
/* the logs table was defined so early I hadn't realized I cared
* about UID and GID.
*/
{ "ALTER TABLE logs ADD uid INTEGER;" },
{ "ALTER TABLE logs ADD gid INTEGER;" },
/* track access types (read/write, etc) */
{ "ALTER TABLE logs ADD access INTEGER;" },
/* client program/path */
{ "ALTER TABLE logs ADD program VARCHAR;" },
/* message type (ping, op) */
{ "ALTER TABLE logs ADD type INTEGER;" },
{ NULL },
};
/* cleanup database before getting started
*
* On a large build, the logs database gets GIGANTIC... And
* we rarely-if-ever delete things from it. So instead of
* doing the vacuum operation on it at startup, which can impose
* a several-minute delay, we do it only on deletions.
*
* There's no setup for log database right now.
*/
char *file_setups[] = {
"VACUUM;",
NULL,
};
struct database_info {
char *pathname;
struct sql_index *indexes;
struct sql_table *tables;
struct sql_migration *migrations;
char **pragmas;
char **setups;
struct sqlite3 **db;
};
static struct database_info db_infos[] = {
{
"logs.db",
log_indexes,
log_tables,
log_migrations,
log_pragmas,
NULL,
&log_db
},
{
"files.db",
file_indexes,
file_tables,
file_migrations,
file_pragmas,
file_setups,
&file_db
},
{ 0, 0, 0, 0, 0, 0, 0 }
};
/* pretty-print error along with the underlying SQL error. */
static void
dberr(sqlite3 *db, char *fmt, ...) {
va_list ap;
char debuff[8192];
int len;
va_start(ap, fmt);
len = vsnprintf(debuff, 8192, fmt, ap);
va_end(ap);
len = write(pseudo_util_debug_fd, debuff, len);
if (db) {
len = snprintf(debuff, 8192, ": %s\n", sqlite3_errmsg(db));
len = write(pseudo_util_debug_fd, debuff, len);
} else {
len = write(pseudo_util_debug_fd, " (no db)\n", 9);
}
}
/* those who enjoy children, sausages, and databases, should not watch
* them being made.
*/
static int
make_tables(sqlite3 *db,
struct sql_table *sql_tables,
struct sql_index *sql_indexes,
struct sql_migration *sql_migrations,
char **existing, int rows) {
static sqlite3_stmt *stmt;
sqlite3_stmt *update_version = 0;
struct sql_migration *m;
int available_migrations;
int version = -1;
int i, j;
char *sql;
char *errmsg;
int rc;
int found = 0;
for (i = 0; sql_tables[i].name; ++i) {
found = 0;
for (j = 1; j <= rows; ++j) {
if (!strcmp(existing[j], sql_tables[i].name)) {
found = 1;
break;
}
}
if (found)
continue;
/* now to create the table */
sql = sqlite3_mprintf("CREATE TABLE %s ( %s );",
sql_tables[i].name, sql_tables[i].sql);
rc = sqlite3_exec(db, sql, NULL, NULL, &errmsg);
sqlite3_free(sql);
if (rc) {
dberr(db, "error trying to create %s", sql_tables[i].name);
return 1;
}
if (sql_tables[i].values) {
for (j = 0; sql_tables[i].values[j].fmt; ++j) {
char buffer[256];
snprintf(buffer, sizeof(buffer), sql_tables[i].values[j].fmt, sql_tables[i].values[j].arg);
sql = sqlite3_mprintf("INSERT INTO %s ( %s ) VALUES ( %s );",
sql_tables[i].name,
*sql_tables[i].names,
buffer);
rc = sqlite3_exec(db, sql, NULL, NULL, &errmsg);
sqlite3_free(sql);
if (rc) {
dberr(db, "error trying to populate %s",
sql_tables[i].name);
return 1;
}
}
}
for (j = 0; sql_indexes[j].name; ++j) {
if (strcmp(sql_indexes[j].table, sql_tables[i].name))
continue;
sql = sqlite3_mprintf("CREATE INDEX %s ON %s ( %s );",
sql_indexes[j].name,
sql_indexes[j].table,
sql_indexes[j].keys);
rc = sqlite3_exec(db, sql, NULL, NULL, &errmsg);
sqlite3_free(sql);
if (rc) {
dberr(db, "error trying to index %s",
sql_tables[i].name);
return 1;
}
}
}
/* now, see about migrations */
found = 0;
for (j = 1; j <= rows; ++j) {
if (!strcmp(existing[j], "migrations")) {
found = 1;
break;
}
}
if (found) {
sql = "SELECT MAX(version) FROM migrations;";
rc = sqlite3_prepare_v2(db, sql, strlen(sql), &stmt, NULL);
if (rc) {
dberr(db, "couldn't examine migrations table");
return 1;
}
rc = sqlite3_step(stmt);
if (rc == SQLITE_ROW) {
version = (unsigned long) sqlite3_column_int64(stmt, 0);
rc = sqlite3_step(stmt);
} else {
version = -1;
}
if (rc != SQLITE_DONE) {
dberr(db, "not done after the single row we expected?", rc);
return 1;
}
pseudo_debug(2, "existing database version: %d\n", version);
rc = sqlite3_finalize(stmt);
if (rc) {
dberr(db, "couldn't finalize version check");
return 1;
}
} else {
pseudo_debug(2, "no existing database version\n");
version = -1;
}
for (m = sql_migrations; m->sql; ++m)
;
available_migrations = m - sql_migrations;
/* I am pretty sure this can never happen. */
if (version < -1)
version = -1;
/* I hope this can never happen. */
if (version >= available_migrations)
version = available_migrations - 1;
for (m = sql_migrations + (version + 1); m->sql; ++m) {
int migration = (m - sql_migrations);
pseudo_debug(3, "considering migration %d\n", migration);
if (version >= migration)
continue;
pseudo_debug(2, "running migration %d\n", migration);
rc = sqlite3_prepare_v2(db,
m->sql,
strlen(m->sql),
&stmt, NULL);
if (rc) {
dberr(log_db, "couldn't prepare migration %d (%s)",
migration, m->sql);
return 1;
}
rc = sqlite3_step(stmt);
if (rc != SQLITE_DONE) {
dberr(file_db, "migration %d failed",
migration);
return 1;
}
sqlite3_finalize(stmt);
/* this has to occur here, because the first migration
* executed CREATES the migration table, so you can't
* prepare this statement if you haven't already executed
* the first migration.
*
* Lesson learned: Yes, it actually WILL be a sort of big
* deal to add versioning later.
*/
static char *update_sql =
"INSERT INTO migrations ("
"version, stamp, sql"
") VALUES (?, ?, ?);";
rc = sqlite3_prepare_v2(db,
update_sql,
strlen(update_sql),
&update_version, NULL);
if (rc) {
dberr(db, "couldn't prepare statement to update migrations");
return 1;
}
sqlite3_bind_int(update_version, 1, migration);
sqlite3_bind_int(update_version, 2, time(NULL));
sqlite3_bind_text(update_version, 3, m->sql, -1, SQLITE_STATIC);
rc = sqlite3_step(update_version);
if (rc != SQLITE_DONE) {
dberr(db, "couldn't update migrations table (after migration to version %d)",
migration);
sqlite3_finalize(update_version);
return 1;
} else {
pseudo_debug(3, "update of migrations (after %d) fine.\n",
migration);
}
sqlite3_finalize(update_version);
update_version = 0;
version = migration;
}
return 0;
}
/* registered with atexit */
static void
cleanup_db(void) {
pseudo_debug(1, "server exiting\n");
if (file_db)
sqlite3_close(file_db);
if (log_db)
sqlite3_close(log_db);
}
/* This function has been rewritten and I no longer hate it. I just feel
* like it's important to say that.
*/
static int
get_db(struct database_info *dbinfo) {
int rc;
int i;
char *sql;
char **results;
int rows, columns;
char *errmsg;
static int registered_cleanup = 0;
char *dbfile;
sqlite3 *db;
if (!dbinfo)
return 1;
if (!dbinfo->db)
return 1;
/* this database is perhaps already initialized? */
if (*(dbinfo->db))
return 0;
dbfile = pseudo_localstatedir_path(dbinfo->pathname);
rc = sqlite3_open(dbfile, &db);
free(dbfile);
if (rc) {
pseudo_diag("Failed: %s\n", sqlite3_errmsg(db));
sqlite3_close(db);
*(dbinfo->db) = NULL;
return 1;
}
/* we store this in the database_info, but hereafter we'll just use
* the name db, because it is shorter.
*/
*dbinfo->db = db;
if (!registered_cleanup) {
atexit(cleanup_db);
registered_cleanup = 1;
}
if (dbinfo->pragmas) {
for (i = 0; dbinfo->pragmas[i]; ++i) {
rc = sqlite3_exec(db, dbinfo->pragmas[i], NULL, NULL, &errmsg);
if (rc) {
dberr(db, dbinfo->pragmas[i]);
}
}
}
/* create database tables or die trying */
sql = "SELECT name FROM sqlite_master "
"WHERE type = 'table' "
"ORDER BY name;";
rc = sqlite3_get_table(db, sql, &results, &rows, &columns, &errmsg);
if (rc) {
pseudo_diag("Failed: %s\n", errmsg);
} else {
rc = make_tables(db, dbinfo->tables, dbinfo->indexes, dbinfo->migrations, results, rows);
sqlite3_free_table(results);
}
/* as of now, the only setup is a vacuum operation which we don't care about
* the results of.
*/
if (dbinfo->setups) {
for (i = 0; dbinfo->setups[i]; ++i) {
sqlite3_exec(db, dbinfo->setups[i], NULL, NULL, &errmsg);
}
}
return rc;
}
static int
get_dbs(void) {
int err = 0;
int i;
for (i = 0; db_infos[i].db; ++i) {
if (get_db(&db_infos[i])) {
pseudo_diag("Error getting '%s' database.\n",
db_infos[i].pathname);
err = 1;
}
}
return err;
}
/* put a prepared log entry into the database */
int
pdb_log_traits(pseudo_query_t *traits) {
pseudo_query_t *trait;
log_entry *e;
int rc;
if (!log_db && get_dbs()) {
pseudo_diag("%s: database error.\n", __func__);
return 1;
}
e = calloc(sizeof(*e), 1);
if (!e) {
pseudo_diag("can't allocate space for log entry.");
return 1;
}
for (trait = traits; trait; trait = trait->next) {
switch (trait->field) {
case PSQF_ACCESS:
e->access = trait->data.ivalue;
break;
case PSQF_CLIENT:
e->client = trait->data.ivalue;
break;
case PSQF_DEV:
e->dev = trait->data.ivalue;
break;
case PSQF_FD:
e->fd = trait->data.ivalue;
break;
case PSQF_FTYPE:
e->mode |= (trait->data.ivalue & S_IFMT);
break;
case PSQF_GID:
e->gid = trait->data.ivalue;
break;
case PSQF_INODE:
e->ino = trait->data.ivalue;
break;
case PSQF_MODE:
e->mode = trait->data.ivalue;
break;
case PSQF_OP:
e->op = trait->data.ivalue;
break;
case PSQF_PATH:
e->path = trait->data.svalue ?
strdup(trait->data.svalue) : NULL;
break;
case PSQF_PERM:
e->mode |= (trait->data.ivalue & ~(S_IFMT) & 0177777);
break;
case PSQF_PROGRAM:
e->program = trait->data.svalue ?
strdup(trait->data.svalue) : NULL;
break;
case PSQF_RESULT:
e->result = trait->data.ivalue;
break;
case PSQF_SEVERITY:
e->severity = trait->data.ivalue;
break;
case PSQF_STAMP:
e->stamp = trait->data.ivalue;
break;
case PSQF_TAG:
e->tag = trait->data.svalue ?
strdup(trait->data.svalue) : NULL;
break;
case PSQF_TEXT:
e->text = trait->data.svalue ?
strdup(trait->data.svalue) : NULL;
break;
case PSQF_TYPE:
e->type = trait->data.ivalue;
break;
case PSQF_UID:
e->uid = trait->data.ivalue;
break;
case PSQF_ID:
case PSQF_ORDER:
default:
pseudo_diag("Invalid trait %s for log creation.\n",
pseudo_query_field_name(trait->field));
free(e);
return 1;
break;
}
}
rc = pdb_log_entry(e);
log_entry_free(e);
return rc;
}
/* create a log from a given log entry, with tag and text */
int
pdb_log_entry(log_entry *e) {
char *sql = "INSERT INTO logs "
"(stamp, op, access, client, dev, gid, ino, mode, path, result, severity, text, program, tag, type, uid)"
" VALUES "
"(?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?);";
static sqlite3_stmt *insert;
int field;
int rc;
if (!log_db && get_dbs()) {
pseudo_diag("%s: database error.\n", __func__);
return 1;
}
if (!insert) {
rc = sqlite3_prepare_v2(log_db, sql, strlen(sql), &insert, NULL);
if (rc) {
dberr(log_db, "couldn't prepare INSERT statement");
return 1;
}
}
field = 1;
if (e) {
if (e->stamp) {
sqlite3_bind_int(insert, field++, e->stamp);
} else {
sqlite3_bind_int(insert, field++, (unsigned long) time(NULL));
}
sqlite3_bind_int(insert, field++, e->op);
sqlite3_bind_int(insert, field++, e->access);
sqlite3_bind_int(insert, field++, e->client);
sqlite3_bind_int(insert, field++, e->dev);
sqlite3_bind_int(insert, field++, e->gid);
sqlite3_bind_int(insert, field++, e->ino);
sqlite3_bind_int(insert, field++, e->mode);
if (e->path) {
sqlite3_bind_text(insert, field++, e->path, -1, SQLITE_STATIC);
} else {
sqlite3_bind_null(insert, field++);
}
sqlite3_bind_int(insert, field++, e->result);
sqlite3_bind_int(insert, field++, e->severity);
if (e->text) {
sqlite3_bind_text(insert, field++, e->text, -1, SQLITE_STATIC);
} else {
sqlite3_bind_null(insert, field++);
}
if (e->program) {
sqlite3_bind_text(insert, field++, e->program, -1, SQLITE_STATIC);
} else {
sqlite3_bind_null(insert, field++);
}
if (e->tag) {
sqlite3_bind_text(insert, field++, e->tag, -1, SQLITE_STATIC);
} else {
sqlite3_bind_null(insert, field++);
}
sqlite3_bind_int(insert, field++, e->type);
sqlite3_bind_int(insert, field++, e->uid);
} else {
sqlite3_bind_int(insert, field++, (unsigned long) time(NULL));
sqlite3_bind_int(insert, field++, 0);
sqlite3_bind_int(insert, field++, 0);
sqlite3_bind_int(insert, field++, 0);
sqlite3_bind_int(insert, field++, 0);
sqlite3_bind_int(insert, field++, 0);
sqlite3_bind_int(insert, field++, 0);
sqlite3_bind_int(insert, field++, 0);
sqlite3_bind_null(insert, field++);
sqlite3_bind_int(insert, field++, 0);
sqlite3_bind_int(insert, field++, 0);
sqlite3_bind_null(insert, field++);
sqlite3_bind_null(insert, field++);
sqlite3_bind_null(insert, field++);
sqlite3_bind_int(insert, field++, 0);
sqlite3_bind_int(insert, field++, 0);
}
rc = sqlite3_step(insert);
if (rc != SQLITE_DONE) {
dberr(log_db, "insert may have failed");
}
sqlite3_reset(insert);
sqlite3_clear_bindings(insert);
return rc != SQLITE_DONE;
}
/* create a log from a given message, with tag and text */
int
pdb_log_msg(pseudo_sev_t severity, pseudo_msg_t *msg, const char *program, const char *tag, const char *text, ...) {
char *sql = "INSERT INTO logs "
"(stamp, op, access, client, dev, gid, ino, mode, path, result, uid, severity, text, program, tag, type)"
" VALUES "
"(?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?);";
static sqlite3_stmt *insert;
char buffer[8192];
int field;
int rc;
va_list ap;
if (text) {
va_start(ap, text);
vsnprintf(buffer, 8192, text, ap);
va_end(ap);
text = buffer;
}
if (!log_db && get_dbs()) {
pseudo_diag("%s: database error.\n", __func__);
return 1;
}
if (!insert) {
rc = sqlite3_prepare_v2(log_db, sql, strlen(sql), &insert, NULL);
if (rc) {
dberr(log_db, "couldn't prepare INSERT statement");
return 1;
}
}
field = 1;
sqlite3_bind_int(insert, field++, (unsigned long) time(NULL));
if (msg) {
sqlite3_bind_int(insert, field++, msg->op);
sqlite3_bind_int(insert, field++, msg->access);
sqlite3_bind_int(insert, field++, msg->client);
sqlite3_bind_int(insert, field++, msg->dev);
sqlite3_bind_int(insert, field++, msg->gid);
sqlite3_bind_int(insert, field++, msg->ino);
sqlite3_bind_int(insert, field++, msg->mode);
if (msg->pathlen) {
sqlite3_bind_text(insert, field++, msg->path, -1, SQLITE_STATIC);
} else {
sqlite3_bind_null(insert, field++);
}
sqlite3_bind_int(insert, field++, msg->result);
sqlite3_bind_int(insert, field++, msg->uid);
} else {
sqlite3_bind_int(insert, field++, 0);
sqlite3_bind_int(insert, field++, 0);
sqlite3_bind_int(insert, field++, 0);
sqlite3_bind_int(insert, field++, 0);
sqlite3_bind_int(insert, field++, 0);
sqlite3_bind_int(insert, field++, 0);
sqlite3_bind_int(insert, field++, 0);
sqlite3_bind_null(insert, field++);
sqlite3_bind_int(insert, field++, 0);
sqlite3_bind_int(insert, field++, 0);
}
sqlite3_bind_int(insert, field++, severity);
if (text) {
sqlite3_bind_text(insert, field++, text, -1, SQLITE_STATIC);
} else {
sqlite3_bind_null(insert, field++);
}
if (program) {
sqlite3_bind_text(insert, field++, program, -1, SQLITE_STATIC);
} else {
sqlite3_bind_null(insert, field++);
}
if (tag) {
sqlite3_bind_text(insert, field++, tag, -1, SQLITE_STATIC);
} else {
sqlite3_bind_null(insert, field++);
}
if (msg) {
sqlite3_bind_int(insert, field++, msg->type);
} else {
sqlite3_bind_int(insert, field++, 0);
}
rc = sqlite3_step(insert);
if (rc != SQLITE_DONE) {
dberr(log_db, "insert may have failed");
}
sqlite3_reset(insert);
sqlite3_clear_bindings(insert);
return rc != SQLITE_DONE;
}
#define BFSZ 8192
typedef struct {
size_t buflen;
char *data;
char *tail;
} buffer;
static int
frag(buffer *b, char *fmt, ...) {
va_list ap;
static size_t curlen;
int rc;
if (!b) {
pseudo_diag("frag called without buffer.\n");
return -1;
}
curlen = b->tail - b->data;
va_start(ap, fmt);
rc = vsnprintf(b->tail, b->buflen - curlen, fmt, ap);
va_end(ap);
if ((rc > 0) && ((size_t) rc >= (b->buflen - curlen))) {
size_t newlen = b->buflen;
while (newlen <= (rc + curlen))
newlen *= 2;
char *newbuf = malloc(newlen);
if (!newbuf) {
pseudo_diag("failed to allocate SQL buffer.\n");
return -1;
}
memcpy(newbuf, b->data, curlen + 1);
b->tail = newbuf + curlen;
free(b->data);
b->data = newbuf;
b->buflen = newlen;
/* try again */
va_start(ap, fmt);
rc = vsnprintf(b->tail, b->buflen - curlen, fmt, ap);
va_end(ap);
if ((rc > 0) && ((size_t) rc >= (b->buflen - curlen))) {
pseudo_diag("tried to reallocate larger buffer, failed. giving up.\n");
return -1;
}
}
if (rc >= 0)
b->tail += rc;
return rc;
}
sqlite3_stmt *
pdb_query(char *stmt_type, pseudo_query_t *traits, unsigned long fields, int unique, int want_results) {
pseudo_query_t *trait;
sqlite3_stmt *stmt;
int done_any = 0;
int field = 0;
const char *order_by = "id";
char *order_dir = "ASC";
int rc;
pseudo_query_field_t f;
static buffer *sql;
if (!log_db && get_dbs()) {
pseudo_diag("%s: database error.\n", __func__);
return NULL;
}
if (!stmt_type) {
pseudo_diag("can't prepare a statement without a type.\n");
}
if (!sql) {
sql = malloc(sizeof *sql);
if (!sql) {
pseudo_diag("can't allocate SQL buffer.\n");
return NULL;
}
sql->buflen = 512;
sql->data = malloc(sql->buflen);
if (!sql->data) {
pseudo_diag("can't allocate SQL text buffer.\n");
free(sql);
sql = 0;
return NULL;
}
}
sql->tail = sql->data;
/* should be DELETE or SELECT */
frag(sql, "%s ", stmt_type);
if (want_results) {
if (unique)
frag(sql, "DISTINCT ");
done_any = 0;
for (f = PSQF_NONE + 1; f < PSQF_MAX; ++f) {
if (fields & (1 << f)) {
frag(sql, "%s%s",
done_any ? ", " : "",
pseudo_query_field_name(f));
done_any = 1;
}
}
}
frag(sql, " FROM logs ");
/* first, build up an SQL string with the fields and operators */
done_any = 0;
for (trait = traits; trait; trait = trait->next) {
if (trait->field != PSQF_ORDER) {
if (done_any) {
frag(sql, "AND ");
} else {
frag(sql, "WHERE ");
done_any = 1;
}
}
switch (trait->field) {
case PSQF_PROGRAM:
case PSQF_TEXT:
case PSQF_TAG:
case PSQF_PATH:
switch (trait->type) {
case PSQT_LIKE:
frag(sql, "%s %s ('%' || ? || '%')",
pseudo_query_field_name(trait->field),
pseudo_query_type_sql(trait->type));
break;
case PSQT_NOTLIKE:
case PSQT_SQLPAT:
frag(sql, "%s %s ?",
pseudo_query_field_name(trait->field),
pseudo_query_type_sql(trait->type));
break;
default:
frag(sql, "%s %s ? ",
pseudo_query_field_name(trait->field),
pseudo_query_type_sql(trait->type));
break;
}
break;
case PSQF_PERM:
switch (trait->type) {
case PSQT_LIKE:
case PSQT_NOTLIKE:
case PSQT_SQLPAT:
pseudo_diag("Error: Can't use a LIKE match on non-text fields.\n");
return 0;
break;
default:
break;
}
/* mask out permission bits */
frag(sql, "(%s & %d) %s ? ",
"mode",
~(S_IFMT) & 0177777,
pseudo_query_type_sql(trait->type));
break;
case PSQF_FTYPE:
switch (trait->type) {
case PSQT_LIKE:
case PSQT_NOTLIKE:
case PSQT_SQLPAT:
pseudo_diag("Error: Can't use a LIKE match on non-text fields.\n");
return 0;
break;
default:
break;
}
/* mask out permission bits */
frag(sql, "(%s & %d) %s ? ",
"mode",
S_IFMT,
pseudo_query_type_sql(trait->type));
break;
case PSQF_ORDER:
order_by = pseudo_query_field_name(trait->data.ivalue);
switch (trait->type) {
case PSQT_LESS:
order_dir = "DESC";
break;
case PSQT_EXACT:
/* this was already the default */
break;
case PSQT_GREATER: