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clixon/lib/src/clixon_file.c

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/*
*
***** BEGIN LICENSE BLOCK *****
Copyright (C) 2009-2019 Olof Hagsand and Benny Holmgren
Copyright (C) 2020-2022 Olof Hagsand and Rubicon Communications, LLC(Netgate)
This file is part of CLIXON.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
Alternatively, the contents of this file may be used under the terms of
the GNU General Public License Version 3 or later (the "GPL"),
in which case the provisions of the GPL are applicable instead
of those above. If you wish to allow use of your version of this file only
under the terms of the GPL, and not to allow others to
use your version of this file under the terms of Apache License version 2,
indicate your decision by deleting the provisions above and replace them with
the notice and other provisions required by the GPL. If you do not delete
the provisions above, a recipient may use your version of this file under
the terms of any one of the Apache License version 2 or the GPL.
***** END LICENSE BLOCK *****
*
*/
#ifdef HAVE_CONFIG_H
#include "clixon_config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <dirent.h>
#include <regex.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/param.h>
#include <unistd.h>
#include <netinet/in.h>
#include <stddef.h>
/* cligen */
#include <cligen/cligen.h>
/* clicon */
#include "clixon_err.h"
#include "clixon_queue.h"
#include "clixon_string.h"
#include "clixon_log.h"
#include "clixon_file.h"
/*! qsort "compar" for directory alphabetically sorting, see qsort(3)
*/
static int
clicon_file_dirent_sort(const void* arg1,
const void* arg2)
{
struct dirent *d1 = (struct dirent *)arg1;
struct dirent *d2 = (struct dirent *)arg2;
return strcoll(d1->d_name, d2->d_name);
}
/*!
* @param[in,out] cvv On the format: (name, path)*
*/
static int
clicon_files_recursive1(const char *dir,
regex_t *re,
cvec *cvv)
{
int retval = -1;
struct dirent *dent = NULL;
char path[MAXPATHLEN];
DIR *dirp = NULL;
int res = 0;
struct stat st;
if (dir == NULL){
clicon_err(OE_UNIX, EINVAL, "Requires dir != NULL");
goto done;
}
if ((dirp = opendir(dir)) != NULL)
while ((dent = readdir(dirp)) != NULL) {
if (dent->d_type == DT_DIR) {
/* If we find a directory we might want to enter it, unless it
is the current directory (.) or parent (..) */
if (strcmp(dent->d_name, ".") == 0 || strcmp(dent->d_name, "..") == 0)
continue;
/* Build the new directory and enter it. */
sprintf(path, "%s/%s", dir, dent->d_name);
if (clicon_files_recursive1(path, re, cvv) < 0)
goto done;
}
else if (dent->d_type == DT_REG) {
/* If we encounter a file, match it against the regexp and
add it to the list of found files.*/
if (re != NULL &&
regexec(re, dent->d_name, (size_t)0, NULL, 0) != 0)
continue;
snprintf(path, MAXPATHLEN-1, "%s/%s", dir, dent->d_name);
if ((res = lstat(path, &st)) != 0){
clicon_err(OE_UNIX, errno, "lstat");
goto done;
}
if ((st.st_mode & S_IFREG) == 0)
continue;
if (cvec_add_string(cvv, dent->d_name, path) < 0){
clicon_err(OE_UNIX, errno, "cvec_add_string");
goto done;
}
}
}
retval = 0;
done:
if (dirp)
closedir(dirp);
return retval;
}
/*! Find files recursively according to a regexp
*/
int
clicon_files_recursive(const char *dir,
const char *regexp,
cvec *cvv)
{
int retval = -1;
regex_t re = {0,};
int res = 0;
char errbuf[128];
clicon_debug(2, "%s dir:%s", __FUNCTION__, dir);
if (regexp && (res = regcomp(&re, regexp, REG_EXTENDED)) != 0) {
regerror(res, &re, errbuf, sizeof(errbuf));
clicon_err(OE_DB, 0, "regcomp: %s", errbuf);
goto done;
}
if (clicon_files_recursive1(dir, &re, cvv) < 0)
goto done;
retval = 0;
done:
if (regexp)
regfree(&re);
return retval;
}
/*! Return alphabetically sorted files from a directory matching regexp
*
* @param[in] dir Directory path
* @param[out] ent Entries pointer, will be filled in with dir entries. Free after use
* @param[in] regexp Regexp filename matching
* @param[in] type File type matching, see stat(2)
*
* @retval n Number of matching files in directory
* @retval -1 Error
*
* @code
* char *dir = "/root/fs";
* struct dirent *dp;
* if ((ndp = clicon_file_dirent(dir, &dp, "(.so)$", S_IFREG)) < 0)
* return -1;
* for (i = 0; i < ndp; i++)
* do something with dp[i].d_name;
* free(dp);
* @endcode
* @note "ent" is an array with n fixed entries
* But this is not what is returned from the syscall, see man readdir:
* ... the use sizeof(struct dirent) to capture the size of the record including
* the size of d_name is also incorrect.
* @note May block on file I/O
*/
int
clicon_file_dirent(const char *dir,
struct dirent **ent,
const char *regexp,
mode_t type)
{
int retval = -1;
DIR *dirp = NULL;
int res;
int nent;
regex_t re;
char errbuf[128];
char filename[MAXPATHLEN];
struct stat st;
struct dirent *dent;
struct dirent *new = NULL;
int direntStructSize;
*ent = NULL;
nent = 0;
if (regexp && (res = regcomp(&re, regexp, REG_EXTENDED)) != 0) {
regerror(res, &re, errbuf, sizeof(errbuf));
clicon_err(OE_DB, 0, "regcomp: %s", errbuf);
return -1;
}
if ((dirp = opendir(dir)) == NULL) {
if (errno == ENOENT) /* Dir does not exist -> return 0 matches */
retval = 0;
else
clicon_err(OE_UNIX, errno, "opendir(%s)", dir);
goto quit;
}
while((dent = readdir(dirp)) != NULL) {
/* Filename matching */
if (regexp) {
if (regexec(&re, dent->d_name, (size_t) 0, NULL, 0) != 0)
continue;
}
/* File type matching */
if (type) {
snprintf(filename, MAXPATHLEN-1, "%s/%s", dir, dent->d_name);
res = lstat(filename, &st);
if (res != 0) {
clicon_err(OE_UNIX, errno, "lstat");
goto quit;
}
if ((type & st.st_mode) == 0)
continue;
}
direntStructSize = offsetof(struct dirent, d_name) + strlen(dent->d_name) + 1;
if ((new = realloc(new, (nent+1)*sizeof(struct dirent))) == NULL) {
clicon_err(OE_UNIX, errno, "realloc");
goto quit;
} /* realloc */
clicon_debug(2, "%s memcpy(%p %p %u", __FUNCTION__, &new[nent], dent, direntStructSize);
/* man (3) readdir:
* By implication, the use sizeof(struct dirent) to capture the size of the record including
* the size of d_name is also incorrect. */
memset(&new[nent], 0, sizeof(struct dirent));
memcpy(&new[nent], dent, direntStructSize);
nent++;
} /* while */
qsort((void *)new, nent, sizeof(*new), clicon_file_dirent_sort);
*ent = new;
new = NULL;
retval = nent;
quit:
if (new)
free(new);
if (dirp)
closedir(dirp);
if (regexp)
regfree(&re);
return retval;
}
/*! Make a copy of file src. Overwrite existing
*
* @param[in] src Source filename
* @param[out] target Destination filename
* @retval 0 OK
* @retval -1 Error
*/
int
clicon_file_copy(char *src,
char *target)
{
int retval = -1;
int inF = 0, ouF = 0;
int err = 0;
char line[512];
int bytes;
struct stat st;
if (stat(src, &st) != 0){
clicon_err(OE_UNIX, errno, "stat");
return -1;
}
if((inF = open(src, O_RDONLY)) == -1) {
clicon_err(OE_UNIX, errno, "open(%s) for read", src);
return -1;
}
if((ouF = open(target, O_WRONLY | O_CREAT | O_TRUNC, st.st_mode)) == -1) {
clicon_err(OE_UNIX, errno, "open(%s) for write", target);
err = errno;
goto error;
}
while((bytes = read(inF, line, sizeof(line))) > 0)
if (write(ouF, line, bytes) < 0){
clicon_err(OE_UNIX, errno, "write(%s)", src);
err = errno;
goto error;
}
retval = 0;
error:
close(inF);
if (ouF)
close(ouF);
if (retval < 0)
errno = err;
return retval;
}
/*! Read content of file into cbuf
*
* @param[in] filename
* @param[out] cb
* @retval 0 OK
* @retval -1 Error
*/
int
clicon_file_cbuf(const char *filename,
cbuf *cb)
{
int retval = -1;
int fd = 0;
int err = 0;
char line[512];
int bytes;
struct stat st;
if (stat(filename, &st) != 0){
clicon_err(OE_UNIX, errno, "stat");
return -1;
}
if ((fd = open(filename, O_RDONLY)) == -1) {
clicon_err(OE_UNIX, errno, "open(%s) for read", filename);
return -1;
}
while((bytes = read(fd, line, sizeof(line))) > 0)
if (cbuf_append_buf(cb, line, bytes) < 0){
clicon_err(OE_UNIX, errno, "cbuf_append_buf(%s)", filename);
err = errno;
goto error;
}
retval = 0;
error:
close(fd);
if (retval < 0)
errno = err;
return retval;
}
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