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/*
* Copyright (C) 2023 Patrick McDermott
*
* This file is part of opkg-opkg.
*
* opkg-opkg 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.
*
* opkg-opkg 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 opkg-opkg. If not, see <http://www.gnu.org/licenses/>.
*/
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include "defs.h"
#include "gzip.h"
#include "opk.h"
#include "ustar.h"
struct opkg_opk_opk {
FILE *file;
char file_buffer[8192];
struct opkg_opk_gzip *outer_gzip;
struct opkg_opk_ustar *outer_ustar;
char *version_buffer;
size_t version_size;
struct opkg_opk_gzip *inner_gzip;
struct opkg_opk_ustar *inner_ustar;
int previously_printed;
};
static int
_opkg_opk_opk_file_read(void *user_data, char **buffer, size_t *size)
{
struct opkg_opk_opk *opk = user_data;
*buffer = opk->file_buffer;
*size = fread(opk->file_buffer, 1, sizeof(opk->file_buffer),
opk->file);
if (feof(opk->file)) {
return OPKG_OPK_END;
} else if (ferror(opk->file) || *size == 0) {
return OPKG_OPK_ERROR;
} else {
return OPKG_OPK_OK;
}
}
struct opkg_opk_opk *
opkg_opk_opk_init(const char *file_name)
{
struct opkg_opk_opk *opk;
opk = malloc(sizeof(*opk));
if (opk == NULL) {
goto error0;
}
/* Open outer archive. */
opk->file = fopen(file_name, "rb");
if (opk->file == NULL) {
fprintf(stderr, "Error: Failed to open file \"%s\"\n",
file_name);
goto error1;
}
/* Initialize outer gzip decompressor. */
opk->outer_gzip = opkg_opk_gzip_init(&_opkg_opk_opk_file_read, opk);
if (opk->outer_gzip == NULL) {
fputs("Error: Failed to initialize\n", stderr);
goto error2;
}
/* Initialize outer ustar unarchiver. */
opk->outer_ustar = opkg_opk_ustar_init(opk->outer_gzip);
if (opk->outer_ustar == NULL) {
fputs("Error: Failed to initialize\n", stderr);
goto error3;
}
/* Check package version. */
if (opkg_opk_ustar_seek_one(opk->outer_ustar, "debian-binary") !=
OPKG_OPK_OK) {
fputs("Error: Failed to find \"debian-binary\" in archive\n",
stderr);
goto error4;
}
if (opkg_opk_ustar_read(opk->outer_ustar,
&opk->version_buffer, &opk->version_size) !=
OPKG_OPK_OK) {
fputs("Error: Failed to read \"debian-binary\" in archive\n",
stderr);
goto error4;
}
if (opk->version_size < 4 || strncmp(opk->version_buffer, "2.", 2) != 0)
{
fputs("Error: Unsupported package version\n", stderr);
goto error4;
}
opk->previously_printed = 0;
return opk;
error4:
opkg_opk_ustar_free(opk->outer_ustar);
error3:
opkg_opk_gzip_free(opk->outer_gzip);
error2:
fclose(opk->file);
error1:
free(opk);
error0:
return NULL;
}
static int
_opkg_opk_opk_init_inner(struct opkg_opk_opk *opk, const char *member)
{
int ret;
/* Finish reading previous inner archive, if any. */
while ((ret = opkg_opk_ustar_read(opk->outer_ustar, NULL, NULL)) ==
OPKG_OPK_OK);
if (ret == OPKG_OPK_ERROR) {
fputs("Error: Failed to read archive\n", stderr);
return OPKG_OPK_ERROR;
}
/* Find requested inner archive. */
if (opkg_opk_ustar_seek_one(opk->outer_ustar, member) != OPKG_OPK_OK) {
fprintf(stderr, "Error: Failed to find \"%s\" in archive\n",
member);
return OPKG_OPK_ERROR;
}
/* Initialize inner gzip decompressor. */
opk->inner_gzip = opkg_opk_gzip_init(
(opkg_opk_gzip_read_func *) &opkg_opk_ustar_read,
opk->outer_ustar);
if (opk->inner_gzip == NULL) {
fputs("Error: Failed to initialize\n", stderr);
return OPKG_OPK_ERROR;
}
/* Initialize inner ustar unarchiver. */
opk->inner_ustar = opkg_opk_ustar_init(opk->inner_gzip);
if (opk->inner_ustar == NULL) {
fputs("Error: Failed to initialize\n", stderr);
opkg_opk_gzip_free(opk->inner_gzip);
return OPKG_OPK_ERROR;
}
return OPKG_OPK_OK;
}
static void
_opkg_opk_opk_free_inner(struct opkg_opk_opk *opk)
{
opkg_opk_ustar_free(opk->inner_ustar);
opkg_opk_gzip_free(opk->inner_gzip);
}
int
opkg_opk_opk_read_control(struct opkg_opk_opk *opk,
struct opkg_opk_ustar_seek_name *names)
{
char *buffer;
size_t size;
int ret_seek;
int ret_read;
if (_opkg_opk_opk_init_inner(opk, "control.tar.gz") != OPKG_OPK_OK) {
return OPKG_OPK_ERROR;
}
while ((ret_seek = opkg_opk_ustar_seek(opk->inner_ustar, names)) !=
OPKG_OPK_ERROR) {
if (opk->previously_printed == 1) {
puts("");
}
while ((ret_read = opkg_opk_ustar_read(opk->inner_ustar,
&buffer, &size)) == OPKG_OPK_OK)
{
if (fwrite(buffer, 1, size, stdout) != size) {
fputs("Error: Failed to print control file\n",
stderr);
_opkg_opk_opk_free_inner(opk);
return OPKG_OPK_ERROR;
}
}
if (ret_read == OPKG_OPK_ERROR) {
fputs("Error: Failed to read control file\n", stderr);
_opkg_opk_opk_free_inner(opk);
return OPKG_OPK_ERROR;
}
opk->previously_printed = 1;
if (ret_seek == OPKG_OPK_END) {
break;
}
}
if (ret_seek == OPKG_OPK_ERROR) {
fputs("Error: Failed to find control file\n", stderr);
_opkg_opk_opk_free_inner(opk);
return OPKG_OPK_ERROR;
}
_opkg_opk_opk_free_inner(opk);
return OPKG_OPK_OK;
}
int
opkg_opk_opk_list_members(struct opkg_opk_opk *opk)
{
struct opkg_opk_ustar_member *head;
struct opkg_opk_ustar_member *tail;
struct opkg_opk_ustar_member *member;
int ret;
size_t uname_len;
size_t uname_len_max;
size_t gname_len;
size_t gname_len_max;
uint64_t size_max;
long int size_len_max;
char fmt[29];
/* "%c%s %-32s/%-32s %11d %s %s\n" */
size_t len;
char mode[10];
char mtime[20];
if (opk->previously_printed == 1) {
puts("");
}
if (_opkg_opk_opk_init_inner(opk, "data.tar.gz") != OPKG_OPK_OK) {
return OPKG_OPK_ERROR;
}
/* Build singly-linked list and find maximum column widths. */
head = NULL;
uname_len_max = 0;
gname_len_max = 0;
size_max = 0;
while ((ret = opkg_opk_ustar_list(opk->inner_ustar, &member)) ==
OPKG_OPK_OK) {
if (head == NULL) {
head = member;
} else {
tail->next = member;
}
tail = member;
uname_len = strlen(member->uname);
if (uname_len > uname_len_max) {
uname_len_max = uname_len;
}
gname_len = strlen(member->gname);
if (gname_len > gname_len_max) {
gname_len_max = gname_len;
}
if (member->size > size_max) {
size_max = member->size;
}
}
if (ret == OPKG_OPK_ERROR) {
fputs("Error: Failed to list data files\n", stderr);
_opkg_opk_opk_free_inner(opk);
return OPKG_OPK_ERROR;
}
tail->next = NULL;
/* Print and free members. */
ret = OPKG_OPK_OK;
size_len_max = lrint(ceil(log10(size_max)));
snprintf(fmt, sizeof(fmt), "%%c%%s %%-%zus/%%-%zus %%%lid %%s %%s\n",
uname_len, gname_len, size_len_max);
len = 35 + uname_len + gname_len + size_len_max;
for (member = head; member != NULL;) {
if (member->mode & 00400) mode[0] = 'r'; else mode[0] = '-';
if (member->mode & 00200) mode[1] = 'w'; else mode[1] = '-';
if (member->mode & 00100) mode[2] = 'x'; else mode[2] = '-';
if (member->mode & 04000) mode[2] = 's';
if (member->mode & 00040) mode[3] = 'r'; else mode[3] = '-';
if (member->mode & 00020) mode[4] = 'w'; else mode[4] = '-';
if (member->mode & 00010) mode[5] = 'x'; else mode[5] = '-';
if (member->mode & 02000) mode[5] = 's';
if (member->mode & 00004) mode[6] = 'r'; else mode[6] = '-';
if (member->mode & 00002) mode[7] = 'w'; else mode[7] = '-';
if (member->mode & 00001) mode[8] = 'x'; else mode[8] = '-';
if (member->mode & 01000) mode[8] = 't';
mode[9] = '\0';
strftime(mtime, sizeof(mtime), "%Y-%m-%d %H:%M:%S",
localtime(&member->mtime));
if (printf(fmt, member->type, mode,
member->uname, member->gname,
member->size, mtime, member->name) !=
(int) (len + strlen(member->name))) {
ret = OPKG_OPK_ERROR;
}
head = member;
member = member->next;
free(head);
}
opk->previously_printed = 1;
_opkg_opk_opk_free_inner(opk);
return ret;
}
void
opkg_opk_opk_free(struct opkg_opk_opk *opk)
{
opkg_opk_ustar_free(opk->outer_ustar);
opkg_opk_gzip_free(opk->outer_gzip);
fclose(opk->file);
free(opk);
}
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