/* $Id$ */
/*
* Copyright (c) 2012 Kristaps Dzonsons <kristaps@bsd.lv>
* Copyright (c) 2013, 2014, 2015 Ingo Schwarze <schwarze@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "config.h"
#include <sys/mman.h>
#include <sys/types.h>
#include <assert.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <getopt.h>
#include <glob.h>
#include <limits.h>
#include <regex.h>
#include <stdio.h>
#include <stdint.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#if HAVE_OHASH
#include <ohash.h>
#else
#include "compat_ohash.h"
#endif
#include <sqlite3.h>
#ifndef SQLITE_DETERMINISTIC
#define SQLITE_DETERMINISTIC 0
#endif
#include "mandoc.h"
#include "mandoc_aux.h"
#include "manconf.h"
#include "mansearch.h"
extern int mansearch_keymax;
extern const char *const mansearch_keynames[];
#define SQL_BIND_TEXT(_db, _s, _i, _v) \
do { if (SQLITE_OK != sqlite3_bind_text \
((_s), (_i)++, (_v), -1, SQLITE_STATIC)) \
warnx("%s", sqlite3_errmsg((_db))); \
} while (0)
#define SQL_BIND_INT64(_db, _s, _i, _v) \
do { if (SQLITE_OK != sqlite3_bind_int64 \
((_s), (_i)++, (_v))) \
warnx("%s", sqlite3_errmsg((_db))); \
} while (0)
#define SQL_BIND_BLOB(_db, _s, _i, _v) \
do { if (SQLITE_OK != sqlite3_bind_blob \
((_s), (_i)++, (&_v), sizeof(_v), SQLITE_STATIC)) \
warnx("%s", sqlite3_errmsg((_db))); \
} while (0)
struct expr {
regex_t regexp; /* compiled regexp, if applicable */
const char *substr; /* to search for, if applicable */
struct expr *next; /* next in sequence */
uint64_t bits; /* type-mask */
int equal; /* equality, not subsring match */
int open; /* opening parentheses before */
int and; /* logical AND before */
int close; /* closing parentheses after */
};
struct match {
uint64_t pageid; /* identifier in database */
uint64_t bits; /* name type mask */
char *desc; /* manual page description */
int form; /* bit field: formatted, zipped? */
};
static void buildnames(const struct mansearch *,
struct manpage *, sqlite3 *,
sqlite3_stmt *, uint64_t,
const char *, int form);
static char *buildoutput(sqlite3 *, sqlite3_stmt *,
uint64_t, uint64_t);
static void *hash_alloc(size_t, void *);
static void hash_free(void *, void *);
static void *hash_calloc(size_t, size_t, void *);
static struct expr *exprcomp(const struct mansearch *,
int, char *[]);
static void exprfree(struct expr *);
static struct expr *exprterm(const struct mansearch *, char *, int);
static int manpage_compare(const void *, const void *);
static void sql_append(char **sql, size_t *sz,
const char *newstr, int count);
static void sql_match(sqlite3_context *context,
int argc, sqlite3_value **argv);
static void sql_regexp(sqlite3_context *context,
int argc, sqlite3_value **argv);
static char *sql_statement(const struct expr *);
int
mansearch_setup(int start)
{
static void *pagecache;
int c;
#define PC_PAGESIZE 1280
#define PC_NUMPAGES 256
if (start) {
if (NULL != pagecache) {
warnx("pagecache already enabled");
return (int)MANDOCLEVEL_BADARG;
}
pagecache = mmap(NULL, PC_PAGESIZE * PC_NUMPAGES,
PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_ANON, -1, 0);
if (MAP_FAILED == pagecache) {
perror("mmap");
pagecache = NULL;
return (int)MANDOCLEVEL_SYSERR;
}
c = sqlite3_config(SQLITE_CONFIG_PAGECACHE,
pagecache, PC_PAGESIZE, PC_NUMPAGES);
if (SQLITE_OK == c)
return (int)MANDOCLEVEL_OK;
warnx("pagecache: %s", sqlite3_errstr(c));
} else if (NULL == pagecache) {
warnx("pagecache missing");
return (int)MANDOCLEVEL_BADARG;
}
if (-1 == munmap(pagecache, PC_PAGESIZE * PC_NUMPAGES)) {
perror("munmap");
pagecache = NULL;
return (int)MANDOCLEVEL_SYSERR;
}
pagecache = NULL;
return (int)MANDOCLEVEL_OK;
}
int
mansearch(const struct mansearch *search,
const struct manpaths *paths,
int argc, char *argv[],
struct manpage **res, size_t *sz)
{
int64_t pageid;
uint64_t outbit, iterbit;
char buf[PATH_MAX];
char *sql;
struct manpage *mpage;
struct expr *e, *ep;
sqlite3 *db;
sqlite3_stmt *s, *s2;
struct match *mp;
struct ohash_info info;
struct ohash htab;
unsigned int idx;
size_t i, j, cur, maxres;
int c, chdir_status, getcwd_status, indexbit;
if (argc == 0 || (e = exprcomp(search, argc, argv)) == NULL) {
*sz = 0;
return 0;
}
info.calloc = hash_calloc;
info.alloc = hash_alloc;
info.free = hash_free;
info.key_offset = offsetof(struct match, pageid);
cur = maxres = 0;
*res = NULL;
if (NULL != search->outkey) {
outbit = TYPE_Nd;
for (indexbit = 0, iterbit = 1;
indexbit < mansearch_keymax;
indexbit++, iterbit <<= 1) {
if (0 == strcasecmp(search->outkey,
mansearch_keynames[indexbit])) {
outbit = iterbit;
break;
}
}
} else
outbit = 0;
/*
* Remember the original working directory, if possible.
* This will be needed if the second or a later directory
* is given as a relative path.
* Do not error out if the current directory is not
* searchable: Maybe it won't be needed after all.
*/
if (getcwd(buf, PATH_MAX) == NULL) {
getcwd_status = 0;
(void)strlcpy(buf, strerror(errno), sizeof(buf));
} else
getcwd_status = 1;
sql = sql_statement(e);
/*
* Loop over the directories (containing databases) for us to
* search.
* Don't let missing/bad databases/directories phase us.
* In each, try to open the resident database and, if it opens,
* scan it for our match expression.
*/
chdir_status = 0;
for (i = 0; i < paths->sz; i++) {
if (chdir_status && paths->paths[i][0] != '/') {
if ( ! getcwd_status) {
warnx("%s: getcwd: %s", paths->paths[i], buf);
continue;
} else if (chdir(buf) == -1) {
perror(buf);
continue;
}
}
if (chdir(paths->paths[i]) == -1) {
perror(paths->paths[i]);
continue;
}
chdir_status = 1;
c = sqlite3_open_v2(MANDOC_DB, &db,
SQLITE_OPEN_READONLY, NULL);
if (SQLITE_OK != c) {
warn("%s/%s", paths->paths[i], MANDOC_DB);
sqlite3_close(db);
continue;
}
/*
* Define the SQL functions for substring
* and regular expression matching.
*/
c = sqlite3_create_function(db, "match", 2,
SQLITE_UTF8 | SQLITE_DETERMINISTIC,
NULL, sql_match, NULL, NULL);
assert(SQLITE_OK == c);
c = sqlite3_create_function(db, "regexp", 2,
SQLITE_UTF8 | SQLITE_DETERMINISTIC,
NULL, sql_regexp, NULL, NULL);
assert(SQLITE_OK == c);
j = 1;
c = sqlite3_prepare_v2(db, sql, -1, &s, NULL);
if (SQLITE_OK != c)
warnx("%s", sqlite3_errmsg(db));
for (ep = e; NULL != ep; ep = ep->next) {
if (NULL == ep->substr) {
SQL_BIND_BLOB(db, s, j, ep->regexp);
} else
SQL_BIND_TEXT(db, s, j, ep->substr);
if (0 == ((TYPE_Nd | TYPE_Nm) & ep->bits))
SQL_BIND_INT64(db, s, j, ep->bits);
}
memset(&htab, 0, sizeof(struct ohash));
ohash_init(&htab, 4, &info);
/*
* Hash each entry on its [unique] document identifier.
* This is a uint64_t.
* Instead of using a hash function, simply convert the
* uint64_t to a uint32_t, the hash value's type.
* This gives good performance and preserves the
* distribution of buckets in the table.
*/
while (SQLITE_ROW == (c = sqlite3_step(s))) {
pageid = sqlite3_column_int64(s, 2);
idx = ohash_lookup_memory(&htab,
(char *)&pageid, sizeof(uint64_t),
(uint32_t)pageid);
if (NULL != ohash_find(&htab, idx))
continue;
mp = mandoc_calloc(1, sizeof(struct match));
mp->pageid = pageid;
mp->form = sqlite3_column_int(s, 1);
mp->bits = sqlite3_column_int64(s, 3);
if (TYPE_Nd == outbit)
mp->desc = mandoc_strdup((const char *)
sqlite3_column_text(s, 0));
ohash_insert(&htab, idx, mp);
}
if (SQLITE_DONE != c)
warnx("%s", sqlite3_errmsg(db));
sqlite3_finalize(s);
c = sqlite3_prepare_v2(db,
"SELECT sec, arch, name, pageid FROM mlinks "
"WHERE pageid=? ORDER BY sec, arch, name",
-1, &s, NULL);
if (SQLITE_OK != c)
warnx("%s", sqlite3_errmsg(db));
c = sqlite3_prepare_v2(db,
"SELECT bits, key, pageid FROM keys "
"WHERE pageid=? AND bits & ?",
-1, &s2, NULL);
if (SQLITE_OK != c)
warnx("%s", sqlite3_errmsg(db));
for (mp = ohash_first(&htab, &idx);
NULL != mp;
mp = ohash_next(&htab, &idx)) {
if (cur + 1 > maxres) {
maxres += 1024;
*res = mandoc_reallocarray(*res,
maxres, sizeof(struct manpage));
}
mpage = *res + cur;
mpage->ipath = i;
mpage->bits = mp->bits;
mpage->sec = 10;
mpage->form = mp->form;
buildnames(search, mpage, db, s, mp->pageid,
paths->paths[i], mp->form);
if (mpage->names != NULL) {
mpage->output = TYPE_Nd & outbit ?
mp->desc : outbit ?
buildoutput(db, s2, mp->pageid, outbit) :
NULL;
cur++;
}
free(mp);
}
sqlite3_finalize(s);
sqlite3_finalize(s2);
sqlite3_close(db);
ohash_delete(&htab);
/*
* In man(1) mode, prefer matches in earlier trees
* over matches in later trees.
*/
if (cur && search->firstmatch)
break;
}
qsort(*res, cur, sizeof(struct manpage), manpage_compare);
if (chdir_status && getcwd_status && chdir(buf) == -1)
perror(buf);
exprfree(e);
free(sql);
*sz = cur;
return 1;
}
void
mansearch_free(struct manpage *res, size_t sz)
{
size_t i;
for (i = 0; i < sz; i++) {
free(res[i].file);
free(res[i].names);
free(res[i].output);
}
free(res);
}
static int
manpage_compare(const void *vp1, const void *vp2)
{
const struct manpage *mp1, *mp2;
int diff;
mp1 = vp1;
mp2 = vp2;
return (diff = mp2->bits - mp1->bits) ? diff :
(diff = mp1->sec - mp2->sec) ? diff :
strcasecmp(mp1->names, mp2->names);
}
static void
buildnames(const struct mansearch *search, struct manpage *mpage,
sqlite3 *db, sqlite3_stmt *s,
uint64_t pageid, const char *path, int form)
{
glob_t globinfo;
char *firstname, *newnames, *prevsec, *prevarch;
const char *oldnames, *sep1, *name, *sec, *sep2, *arch, *fsec;
size_t i;
int c, globres;
mpage->file = NULL;
mpage->names = NULL;
firstname = prevsec = prevarch = NULL;
i = 1;
SQL_BIND_INT64(db, s, i, pageid);
while (SQLITE_ROW == (c = sqlite3_step(s))) {
/* Decide whether we already have some names. */
if (NULL == mpage->names) {
oldnames = "";
sep1 = "";
} else {
oldnames = mpage->names;
sep1 = ", ";
}
/* Fetch the next name, rejecting sec/arch mismatches. */
sec = (const char *)sqlite3_column_text(s, 0);
if (search->sec != NULL && strcasecmp(sec, search->sec))
continue;
arch = (const char *)sqlite3_column_text(s, 1);
if (search->arch != NULL && *arch != '\0' &&
strcasecmp(arch, search->arch))
continue;
name = (const char *)sqlite3_column_text(s, 2);
/* Remember the first section found. */
if (9 < mpage->sec && '1' <= *sec && '9' >= *sec)
mpage->sec = (*sec - '1') + 1;
/* If the section changed, append the old one. */
if (NULL != prevsec &&
(strcmp(sec, prevsec) ||
strcmp(arch, prevarch))) {
sep2 = '\0' == *prevarch ? "" : "/";
mandoc_asprintf(&newnames, "%s(%s%s%s)",
oldnames, prevsec, sep2, prevarch);
free(mpage->names);
oldnames = mpage->names = newnames;
free(prevsec);
free(prevarch);
prevsec = prevarch = NULL;
}
/* Save the new section, to append it later. */
if (NULL == prevsec) {
prevsec = mandoc_strdup(sec);
prevarch = mandoc_strdup(arch);
}
/* Append the new name. */
mandoc_asprintf(&newnames, "%s%s%s",
oldnames, sep1, name);
free(mpage->names);
mpage->names = newnames;
/* Also save the first file name encountered. */
if (mpage->file != NULL)
continue;
if (form & FORM_SRC) {
sep1 = "man";
fsec = sec;
} else {
sep1 = "cat";
fsec = "0";
}
sep2 = *arch == '\0' ? "" : "/";
mandoc_asprintf(&mpage->file, "%s/%s%s%s%s/%s.%s",
path, sep1, sec, sep2, arch, name, fsec);
if (access(mpage->file, R_OK) != -1)
continue;
/* Handle unusual file name extensions. */
if (firstname == NULL)
firstname = mpage->file;
else
free(mpage->file);
mandoc_asprintf(&mpage->file, "%s/%s%s%s%s/%s.*",
path, sep1, sec, sep2, arch, name);
globres = glob(mpage->file, 0, NULL, &globinfo);
free(mpage->file);
mpage->file = globres ? NULL :
mandoc_strdup(*globinfo.gl_pathv);
globfree(&globinfo);
}
if (c != SQLITE_DONE)
warnx("%s", sqlite3_errmsg(db));
sqlite3_reset(s);
/* If none of the files is usable, use the first name. */
if (mpage->file == NULL)
mpage->file = firstname;
else if (mpage->file != firstname)
free(firstname);
/* Append one final section to the names. */
if (prevsec != NULL) {
sep2 = *prevarch == '\0' ? "" : "/";
mandoc_asprintf(&newnames, "%s(%s%s%s)",
mpage->names, prevsec, sep2, prevarch);
free(mpage->names);
mpage->names = newnames;
free(prevsec);
free(prevarch);
}
}
static char *
buildoutput(sqlite3 *db, sqlite3_stmt *s, uint64_t pageid, uint64_t outbit)
{
char *output, *newoutput;
const char *oldoutput, *sep1, *data;
size_t i;
int c;
output = NULL;
i = 1;
SQL_BIND_INT64(db, s, i, pageid);
SQL_BIND_INT64(db, s, i, outbit);
while (SQLITE_ROW == (c = sqlite3_step(s))) {
if (NULL == output) {
oldoutput = "";
sep1 = "";
} else {
oldoutput = output;
sep1 = " # ";
}
data = (const char *)sqlite3_column_text(s, 1);
mandoc_asprintf(&newoutput, "%s%s%s",
oldoutput, sep1, data);
free(output);
output = newoutput;
}
if (SQLITE_DONE != c)
warnx("%s", sqlite3_errmsg(db));
sqlite3_reset(s);
return output;
}
/*
* Implement substring match as an application-defined SQL function.
* Using the SQL LIKE or GLOB operators instead would be a bad idea
* because that would require escaping metacharacters in the string
* being searched for.
*/
static void
sql_match(sqlite3_context *context, int argc, sqlite3_value **argv)
{
assert(2 == argc);
sqlite3_result_int(context, NULL != strcasestr(
(const char *)sqlite3_value_text(argv[1]),
(const char *)sqlite3_value_text(argv[0])));
}
/*
* Implement regular expression match
* as an application-defined SQL function.
*/
static void
sql_regexp(sqlite3_context *context, int argc, sqlite3_value **argv)
{
assert(2 == argc);
sqlite3_result_int(context, !regexec(
(regex_t *)sqlite3_value_blob(argv[0]),
(const char *)sqlite3_value_text(argv[1]),
0, NULL, 0));
}
static void
sql_append(char **sql, size_t *sz, const char *newstr, int count)
{
size_t newsz;
newsz = 1 < count ? (size_t)count : strlen(newstr);
*sql = mandoc_realloc(*sql, *sz + newsz + 1);
if (1 < count)
memset(*sql + *sz, *newstr, (size_t)count);
else
memcpy(*sql + *sz, newstr, newsz);
*sz += newsz;
(*sql)[*sz] = '\0';
}
/*
* Prepare the search SQL statement.
*/
static char *
sql_statement(const struct expr *e)
{
char *sql;
size_t sz;
int needop;
sql = mandoc_strdup(e->equal ?
"SELECT desc, form, pageid, bits "
"FROM mpages NATURAL JOIN names WHERE " :
"SELECT desc, form, pageid, 0 FROM mpages WHERE ");
sz = strlen(sql);
for (needop = 0; NULL != e; e = e->next) {
if (e->and)
sql_append(&sql, &sz, " AND ", 1);
else if (needop)
sql_append(&sql, &sz, " OR ", 1);
if (e->open)
sql_append(&sql, &sz, "(", e->open);
sql_append(&sql, &sz,
TYPE_Nd & e->bits
? (NULL == e->substr
? "desc REGEXP ?"
: "desc MATCH ?")
: TYPE_Nm == e->bits
? (NULL == e->substr
? "pageid IN (SELECT pageid FROM names "
"WHERE name REGEXP ?)"
: e->equal
? "name = ? "
: "pageid IN (SELECT pageid FROM names "
"WHERE name MATCH ?)")
: (NULL == e->substr
? "pageid IN (SELECT pageid FROM keys "
"WHERE key REGEXP ? AND bits & ?)"
: "pageid IN (SELECT pageid FROM keys "
"WHERE key MATCH ? AND bits & ?)"), 1);
if (e->close)
sql_append(&sql, &sz, ")", e->close);
needop = 1;
}
return sql;
}
/*
* Compile a set of string tokens into an expression.
* Tokens in "argv" are assumed to be individual expression atoms (e.g.,
* "(", "foo=bar", etc.).
*/
static struct expr *
exprcomp(const struct mansearch *search, int argc, char *argv[])
{
uint64_t mask;
int i, toopen, logic, igncase, toclose;
struct expr *first, *prev, *cur, *next;
first = cur = NULL;
logic = igncase = toopen = toclose = 0;
for (i = 0; i < argc; i++) {
if (0 == strcmp("(", argv[i])) {
if (igncase)
goto fail;
toopen++;
toclose++;
continue;
} else if (0 == strcmp(")", argv[i])) {
if (toopen || logic || igncase || NULL == cur)
goto fail;
cur->close++;
if (0 > --toclose)
goto fail;
continue;
} else if (0 == strcmp("-a", argv[i])) {
if (toopen || logic || igncase || NULL == cur)
goto fail;
logic = 1;
continue;
} else if (0 == strcmp("-o", argv[i])) {
if (toopen || logic || igncase || NULL == cur)
goto fail;
logic = 2;
continue;
} else if (0 == strcmp("-i", argv[i])) {
if (igncase)
goto fail;
igncase = 1;
continue;
}
next = exprterm(search, argv[i], !igncase);
if (NULL == next)
goto fail;
if (NULL == first)
first = next;
else
cur->next = next;
prev = cur = next;
/*
* Searching for descriptions must be split out
* because they are stored in the mpages table,
* not in the keys table.
*/
for (mask = TYPE_Nm; mask <= TYPE_Nd; mask <<= 1) {
if (mask & cur->bits && ~mask & cur->bits) {
next = mandoc_calloc(1,
sizeof(struct expr));
memcpy(next, cur, sizeof(struct expr));
prev->open = 1;
cur->bits = mask;
cur->next = next;
cur = next;
cur->bits &= ~mask;
}
}
prev->and = (1 == logic);
prev->open += toopen;
if (cur != prev)
cur->close = 1;
toopen = logic = igncase = 0;
}
if ( ! (toopen || logic || igncase || toclose))
return first;
fail:
if (NULL != first)
exprfree(first);
return NULL;
}
static struct expr *
exprterm(const struct mansearch *search, char *buf, int cs)
{
char errbuf[BUFSIZ];
struct expr *e;
char *key, *val;
uint64_t iterbit;
int i, irc;
if ('\0' == *buf)
return NULL;
e = mandoc_calloc(1, sizeof(struct expr));
if (search->argmode == ARG_NAME) {
e->bits = TYPE_Nm;
e->substr = buf;
e->equal = 1;
return e;
}
/*
* Separate macro keys from search string.
* If needed, request regular expression handling
* by setting e->substr to NULL.
*/
if (search->argmode == ARG_WORD) {
e->bits = TYPE_Nm;
e->substr = NULL;
mandoc_asprintf(&val, "[[:<:]]%s[[:>:]]", buf);
cs = 0;
} else if ((val = strpbrk(buf, "=~")) == NULL) {
e->bits = TYPE_Nm | TYPE_Nd;
e->substr = buf;
} else {
if (val == buf)
e->bits = TYPE_Nm | TYPE_Nd;
if ('=' == *val)
e->substr = val + 1;
*val++ = '\0';
if (NULL != strstr(buf, "arch"))
cs = 0;
}
/* Compile regular expressions. */
if (NULL == e->substr) {
irc = regcomp(&e->regexp, val,
REG_EXTENDED | REG_NOSUB | (cs ? 0 : REG_ICASE));
if (search->argmode == ARG_WORD)
free(val);
if (irc) {
regerror(irc, &e->regexp, errbuf, sizeof(errbuf));
warnx("regcomp: %s", errbuf);
free(e);
return NULL;
}
}
if (e->bits)
return e;
/*
* Parse out all possible fields.
* If the field doesn't resolve, bail.
*/
while (NULL != (key = strsep(&buf, ","))) {
if ('\0' == *key)
continue;
for (i = 0, iterbit = 1;
i < mansearch_keymax;
i++, iterbit <<= 1) {
if (0 == strcasecmp(key,
mansearch_keynames[i])) {
e->bits |= iterbit;
break;
}
}
if (i == mansearch_keymax) {
if (strcasecmp(key, "any")) {
free(e);
return NULL;
}
e->bits |= ~0ULL;
}
}
return e;
}
static void
exprfree(struct expr *p)
{
struct expr *pp;
while (NULL != p) {
pp = p->next;
free(p);
p = pp;
}
}
static void *
hash_calloc(size_t nmemb, size_t sz, void *arg)
{
return mandoc_calloc(nmemb, sz);
}
static void *
hash_alloc(size_t sz, void *arg)
{
return mandoc_malloc(sz);
}
static void
hash_free(void *p, void *arg)
{
free(p);
}
