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mirror of https://git.FreeBSD.org/src.git synced 2024-12-23 11:18:54 +00:00
freebsd/lib/libpkg/match.c
Florent Thoumie 762c7db2e8 - Take libinstall.a out of pkg_install and make it a proper shared library.
- Rework the wrapper support to check libpkg version as well as pkg_install
version.
- Add libfetch to _prebuild_libs.
- There are no new features introduced.

Notes: the API is not stable, so basically, do not use libpkg in your
projects for now. Also there's no manpage for libpkg yet, because the API
will change drastically. I repeat, do not use libpkg for now.
2010-04-23 11:07:43 +00:00

604 lines
13 KiB
C

/*
* FreeBSD install - a package for the installation and maintainance
* of non-core utilities.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* Maxim Sobolev
* 24 February 2001
*
* Routines used to query installed packages.
*
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "pkg.h"
#include <err.h>
#include <fnmatch.h>
#include <fts.h>
#include <regex.h>
/*
* Simple structure representing argv-like
* NULL-terminated list.
*/
struct store {
int currlen;
int used;
char **store;
};
static int rex_match(const char *, const char *, int);
static int csh_match(const char *, const char *, int);
struct store *storecreate(struct store *);
static int storeappend(struct store *, const char *);
static int fname_cmp(const FTSENT * const *, const FTSENT * const *);
/*
* Function to query names of installed packages.
* MatchType - one of MATCH_ALL, MATCH_EREGEX, MATCH_REGEX, MATCH_GLOB, MATCH_NGLOB;
* patterns - NULL-terminated list of glob or regex patterns
* (could be NULL for MATCH_ALL);
* retval - return value (could be NULL if you don't want/need
* return value).
* Returns NULL-terminated list with matching names.
* Names in list returned are dynamically allocated and should
* not be altered by the caller.
*/
char **
matchinstalled(match_t MatchType, char **patterns, int *retval)
{
int i, errcode, len;
char *matched;
const char *paths[2] = {LOG_DIR, NULL};
static struct store *store = NULL;
FTS *ftsp;
FTSENT *f;
Boolean *lmatched = NULL;
store = storecreate(store);
if (store == NULL) {
if (retval != NULL)
*retval = 1;
return NULL;
}
if (retval != NULL)
*retval = 0;
if (!isdir(paths[0])) {
if (retval != NULL)
*retval = 1;
return NULL;
/* Not reached */
}
/* Count number of patterns */
if (patterns != NULL) {
for (len = 0; patterns[len]; len++) {}
lmatched = alloca(sizeof(*lmatched) * len);
if (lmatched == NULL) {
warnx("%s(): alloca() failed", __func__);
if (retval != NULL)
*retval = 1;
return NULL;
}
} else
len = 0;
for (i = 0; i < len; i++)
lmatched[i] = FALSE;
ftsp = fts_open((char * const *)(uintptr_t)paths, FTS_LOGICAL | FTS_NOCHDIR | FTS_NOSTAT, fname_cmp);
if (ftsp != NULL) {
while ((f = fts_read(ftsp)) != NULL) {
if (f->fts_info == FTS_D && f->fts_level == 1) {
fts_set(ftsp, f, FTS_SKIP);
matched = NULL;
errcode = 0;
if (MatchType == MATCH_ALL)
matched = f->fts_name;
else
for (i = 0; patterns[i]; i++) {
errcode = pattern_match(MatchType, patterns[i], f->fts_name);
if (errcode == 1) {
matched = f->fts_name;
lmatched[i] = TRUE;
errcode = 0;
}
if (matched != NULL || errcode != 0)
break;
}
if (errcode == 0 && matched != NULL)
errcode = storeappend(store, matched);
if (errcode != 0) {
if (retval != NULL)
*retval = 1;
return NULL;
/* Not reached */
}
}
}
fts_close(ftsp);
}
if (MatchType == MATCH_GLOB) {
for (i = 0; i < len; i++)
if (lmatched[i] == FALSE)
storeappend(store, patterns[i]);
}
if (store->used == 0)
return NULL;
else
return store->store;
}
int
pattern_match(match_t MatchType, char *pattern, const char *pkgname)
{
int errcode = 0;
const char *fname = pkgname;
char basefname[PATH_MAX];
char condchar = '\0';
char *condition;
/* do we have an appended condition? */
condition = strpbrk(pattern, "<>=");
if (condition) {
const char *ch;
/* yes, isolate the pattern from the condition ... */
if (condition > pattern && condition[-1] == '!')
condition--;
condchar = *condition;
*condition = '\0';
/* ... and compare the name without version */
ch = strrchr(fname, '-');
if (ch && ch - fname < PATH_MAX) {
strlcpy(basefname, fname, ch - fname + 1);
fname = basefname;
}
}
switch (MatchType) {
case MATCH_EREGEX:
case MATCH_REGEX:
errcode = rex_match(pattern, fname, MatchType == MATCH_EREGEX ? 1 : 0);
break;
case MATCH_NGLOB:
case MATCH_GLOB:
errcode = (csh_match(pattern, fname, 0) == 0) ? 1 : 0;
break;
case MATCH_EXACT:
errcode = (strcmp(pattern, fname) == 0) ? 1 : 0;
break;
case MATCH_ALL:
errcode = 1;
break;
default:
break;
}
/* loop over all appended conditions */
while (condition) {
/* restore the pattern */
*condition = condchar;
/* parse the condition (fun with bits) */
if (errcode == 1) {
char *nextcondition;
/* compare version numbers */
int match = 0;
if (*++condition == '=') {
match = 2;
condition++;
}
switch(condchar) {
case '<':
match |= 1;
break;
case '>':
match |= 4;
break;
case '=':
match |= 2;
break;
case '!':
match = 5;
break;
}
/* isolate the version number from the next condition ... */
nextcondition = strpbrk(condition, "<>=!");
if (nextcondition) {
condchar = *nextcondition;
*nextcondition = '\0';
}
/* and compare the versions (version_cmp removes the filename for us) */
if ((match & (1 << (version_cmp(pkgname, condition) + 1))) == 0)
errcode = 0;
condition = nextcondition;
} else {
break;
}
}
return errcode;
}
/*
* Synopsis is similar to matchinstalled(), but use origin
* as a key for matching packages.
*/
char ***
matchallbyorigin(const char **origins, int *retval)
{
char **installed, **allorigins = NULL;
char ***matches = NULL;
int i, j;
if (retval != NULL)
*retval = 0;
installed = matchinstalled(MATCH_ALL, NULL, retval);
if (installed == NULL)
return NULL;
/* Gather origins for all installed packages */
for (i = 0; installed[i] != NULL; i++) {
FILE *fp;
char *buf, *cp, tmp[PATH_MAX];
int cmd;
allorigins = realloc(allorigins, (i + 1) * sizeof(*allorigins));
allorigins[i] = NULL;
snprintf(tmp, PATH_MAX, "%s/%s", LOG_DIR, installed[i]);
/*
* SPECIAL CASE: ignore empty dirs, since we can can see them
* during port installation.
*/
if (isemptydir(tmp))
continue;
strncat(tmp, "/" CONTENTS_FNAME, PATH_MAX);
fp = fopen(tmp, "r");
if (fp == NULL) {
warnx("the package info for package '%s' is corrupt", installed[i]);
continue;
}
cmd = -1;
while (fgets(tmp, sizeof(tmp), fp)) {
int len = strlen(tmp);
while (len && isspace(tmp[len - 1]))
tmp[--len] = '\0';
if (!len)
continue;
cp = tmp;
if (tmp[0] != CMD_CHAR)
continue;
cmd = plist_cmd(tmp + 1, &cp);
if (cmd == PLIST_ORIGIN) {
asprintf(&buf, "%s", cp);
allorigins[i] = buf;
break;
}
}
if (cmd != PLIST_ORIGIN && 0 != strncmp("bsdpan-", installed[i], 7))
warnx("package %s has no origin recorded", installed[i]);
fclose(fp);
}
/* Resolve origins into package names, retaining the sequence */
for (i = 0; origins[i] != NULL; i++) {
matches = realloc(matches, (i + 1) * sizeof(*matches));
struct store *store = NULL;
store = storecreate(store);
for (j = 0; installed[j] != NULL; j++) {
if (allorigins[j]) {
if (csh_match(origins[i], allorigins[j], FNM_PATHNAME) == 0) {
storeappend(store, installed[j]);
}
}
}
if (store->used == 0)
matches[i] = NULL;
else
matches[i] = store->store;
}
if (allorigins) {
for (i = 0; installed[i] != NULL; i++)
if (allorigins[i])
free(allorigins[i]);
free(allorigins);
}
return matches;
}
/*
* Synopsis is similar to matchinstalled(), but use origin
* as a key for matching packages.
*/
char **
matchbyorigin(const char *origin, int *retval)
{
const char *origins[2];
char ***tmp;
origins[0] = origin;
origins[1] = NULL;
tmp = matchallbyorigin(origins, retval);
if (tmp && tmp[0]) {
return tmp[0];
} else {
return NULL;
}
}
/*
* Small linked list to memoize results of isinstalledpkg(). A hash table
* would be faster but for n ~= 1000 may be overkill.
*/
struct iip_memo {
LIST_ENTRY(iip_memo) iip_link;
char *iip_name;
int iip_result;
};
LIST_HEAD(, iip_memo) iip_memo = LIST_HEAD_INITIALIZER(iip_memo);
/*
*
* Return 1 if the specified package is installed,
* 0 if not, and -1 if an error occured.
*/
int
isinstalledpkg(const char *name)
{
int result;
char *buf, *buf2;
struct iip_memo *memo;
LIST_FOREACH(memo, &iip_memo, iip_link) {
if (strcmp(memo->iip_name, name) == 0)
return memo->iip_result;
}
buf2 = NULL;
asprintf(&buf, "%s/%s", LOG_DIR, name);
if (buf == NULL)
goto errout;
if (!isdir(buf) || access(buf, R_OK) == FAIL) {
result = 0;
} else {
asprintf(&buf2, "%s/%s", buf, CONTENTS_FNAME);
if (buf2 == NULL)
goto errout;
if (!isfile(buf2) || access(buf2, R_OK) == FAIL)
result = -1;
else
result = 1;
}
free(buf);
buf = strdup(name);
if (buf == NULL)
goto errout;
free(buf2);
buf2 = NULL;
memo = malloc(sizeof *memo);
if (memo == NULL)
goto errout;
memo->iip_name = buf;
memo->iip_result = result;
LIST_INSERT_HEAD(&iip_memo, memo, iip_link);
return result;
errout:
if (buf != NULL)
free(buf);
if (buf2 != NULL)
free(buf2);
return -1;
}
/*
* Returns 1 if specified pkgname matches RE pattern.
* Otherwise returns 0 if doesn't match or -1 if RE
* engine reported an error (usually invalid syntax).
*/
static int
rex_match(const char *pattern, const char *pkgname, int extended)
{
char errbuf[128];
int errcode;
int retval;
regex_t rex;
retval = 0;
errcode = regcomp(&rex, pattern, (extended ? REG_EXTENDED : REG_BASIC) | REG_NOSUB);
if (errcode == 0)
errcode = regexec(&rex, pkgname, 0, NULL, 0);
if (errcode == 0) {
retval = 1;
} else if (errcode != REG_NOMATCH) {
regerror(errcode, &rex, errbuf, sizeof(errbuf));
warnx("%s: %s", pattern, errbuf);
retval = -1;
}
regfree(&rex);
return retval;
}
/*
* Match string by a csh-style glob pattern. Returns 0 on
* match and FNM_NOMATCH otherwise, to be compatible with
* fnmatch(3).
*/
static int
csh_match(const char *pattern, const char *string, int flags)
{
int ret = FNM_NOMATCH;
const char *nextchoice = pattern;
const char *current = NULL;
int prefixlen = -1;
int currentlen = 0;
int level = 0;
do {
const char *pos = nextchoice;
const char *postfix = NULL;
Boolean quoted = FALSE;
nextchoice = NULL;
do {
const char *eb;
if (!*pos) {
postfix = pos;
} else if (quoted) {
quoted = FALSE;
} else {
switch (*pos) {
case '{':
++level;
if (level == 1) {
current = pos+1;
prefixlen = pos-pattern;
}
break;
case ',':
if (level == 1 && !nextchoice) {
nextchoice = pos+1;
currentlen = pos-current;
}
break;
case '}':
if (level == 1) {
postfix = pos+1;
if (!nextchoice)
currentlen = pos-current;
}
level--;
break;
case '[':
eb = pos+1;
if (*eb == '!' || *eb == '^')
eb++;
if (*eb == ']')
eb++;
while(*eb && *eb != ']')
eb++;
if (*eb)
pos=eb;
break;
case '\\':
quoted = TRUE;
break;
default:
;
}
}
pos++;
} while (!postfix);
if (current) {
char buf[FILENAME_MAX];
snprintf(buf, sizeof(buf), "%.*s%.*s%s", prefixlen, pattern, currentlen, current, postfix);
ret = csh_match(buf, string, flags);
if (ret) {
current = nextchoice;
level = 1;
} else
current = NULL;
} else
ret = fnmatch(pattern, string, flags);
} while (current);
return ret;
}
/*
* Create an empty store, optionally deallocating
* any previously allocated space if store != NULL.
*/
struct store *
storecreate(struct store *store)
{
int i;
if (store == NULL) {
store = malloc(sizeof *store);
if (store == NULL) {
warnx("%s(): malloc() failed", __func__);
return NULL;
}
store->currlen = 0;
store->store = NULL;
} else if (store->store != NULL) {
/* Free previously allocated memory */
for (i = 0; store->store[i] != NULL; i++)
free(store->store[i]);
store->store[0] = NULL;
}
store->used = 0;
return store;
}
/*
* Append specified element to the provided store.
*/
static int
storeappend(struct store *store, const char *item)
{
if (store->used + 2 > store->currlen) {
store->currlen += 16;
store->store = reallocf(store->store,
store->currlen * sizeof(*(store->store)));
if (store->store == NULL) {
store->currlen = 0;
warnx("%s(): reallocf() failed", __func__);
return 1;
}
}
asprintf(&(store->store[store->used]), "%s", item);
if (store->store[store->used] == NULL) {
warnx("%s(): malloc() failed", __func__);
return 1;
}
store->used++;
store->store[store->used] = NULL;
return 0;
}
static int
fname_cmp(const FTSENT * const *a, const FTSENT * const *b)
{
return strcmp((*a)->fts_name, (*b)->fts_name);
}