diff options
Diffstat (limited to 'src/opk.c')
| -rw-r--r-- | src/opk.c | 280 |
1 files changed, 280 insertions, 0 deletions
diff --git a/src/opk.c b/src/opk.c new file mode 100644 index 0000000..14efe10 --- /dev/null +++ b/src/opk.c @@ -0,0 +1,280 @@ +/* + * 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; +}; + +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_outer(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 error0; + } + + /* 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 error1; + } + + /* 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 error2; + } + + /* Check package version. */ + if (opkg_opk_ustar_seek(opk->outer_ustar, 1, "debian-binary") != + OPKG_OPK_OK) { + fputs("Error: Failed to find \"debian-binary\" in archive\n", + stderr); + goto error3; + } + 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 error3; + } + if (opk->version_size < 4 || strncmp(opk->version_buffer, "2.", 2) != 0) + { + fputs("Error: Unsupported package version\n", stderr); + goto error3; + } + + return opk; + + error3: + opkg_opk_ustar_free(opk->outer_ustar); + error2: + opkg_opk_gzip_free(opk->outer_gzip); + error1: + fclose(opk->file); + error0: + return NULL; +} + +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(opk->outer_ustar, 1, 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; +} + +int +opkg_opk_opk_read_control(struct opkg_opk_opk *opk) +{ + char *buffer; + size_t size; + int ret; + + if (opkg_opk_ustar_seek(opk->inner_ustar, 2, "control", "./control") != + OPKG_OPK_OK) { + fputs("Error: Failed to find control file\n", stderr); + return OPKG_OPK_ERROR; + } + while ((ret = opkg_opk_ustar_read(opk->inner_ustar, &buffer, &size)) == + OPKG_OPK_OK) { + fwrite(buffer, 1, size, stdout); + } + if (ret == OPKG_OPK_ERROR) { + fputs("Error: Failed to read control file\n", stderr); + return OPKG_OPK_ERROR; + } + + 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; + char fmt[29]; + /* "%c%s %-32s/%-32s %11d %s %s\n" */ + char mode[10]; + char mtime[20]; + + /* 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); + return OPKG_OPK_ERROR; + } + tail->next = NULL; + + /* Print and free members. */ + snprintf(fmt, sizeof(fmt), "%%c%%s %%-%zus/%%-%zus %%%lid %%s %%s\n", + uname_len, gname_len, lrint(ceil(log10(size_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)); + printf(fmt, + member->type, mode, + member->uname, member->gname, + member->size, mtime, member->name); + head = member; + member = member->next; + free(head); + } + + return OPKG_OPK_OK; +} + +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); +} + +void +opkg_opk_opk_free_outer(struct opkg_opk_opk *opk) +{ + opkg_opk_ustar_free(opk->outer_ustar); + opkg_opk_gzip_free(opk->outer_gzip); + fclose(opk->file); + free(opk); +} |