LXR busybox/archival/rpm.c

   1/* vi: set sw=4 ts=4: */
   2/*
   3 * Mini rpm applet for busybox
   4 *
   5 * Copyright (C) 2001,2002 by Laurence Anderson
   6 *
   7 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
   8 */
   9
  10#include "libbb.h"
  11#include "unarchive.h"
  12
  13#define RPM_HEADER_MAGIC        "\216\255\350"
  14#define RPM_CHAR_TYPE           1
  15#define RPM_INT8_TYPE           2
  16#define RPM_INT16_TYPE          3
  17#define RPM_INT32_TYPE          4
  18/* #define RPM_INT64_TYPE       5   ---- These aren't supported (yet) */
  19#define RPM_STRING_TYPE         6
  20#define RPM_BIN_TYPE            7
  21#define RPM_STRING_ARRAY_TYPE   8
  22#define RPM_I18NSTRING_TYPE     9
  23
  24#define TAG_NAME                1000
  25#define TAG_VERSION             1001
  26#define TAG_RELEASE             1002
  27#define TAG_SUMMARY             1004
  28#define TAG_DESCRIPTION         1005
  29#define TAG_BUILDTIME           1006
  30#define TAG_BUILDHOST           1007
  31#define TAG_SIZE                1009
  32#define TAG_VENDOR              1011
  33#define TAG_LICENSE             1014
  34#define TAG_PACKAGER            1015
  35#define TAG_GROUP               1016
  36#define TAG_URL                 1020
  37#define TAG_PREIN               1023
  38#define TAG_POSTIN              1024
  39#define TAG_FILEFLAGS           1037
  40#define TAG_FILEUSERNAME        1039
  41#define TAG_FILEGROUPNAME       1040
  42#define TAG_SOURCERPM           1044
  43#define TAG_PREINPROG           1085
  44#define TAG_POSTINPROG          1086
  45#define TAG_PREFIXS             1098
  46#define TAG_DIRINDEXES          1116
  47#define TAG_BASENAMES           1117
  48#define TAG_DIRNAMES            1118
  49#define RPMFILE_CONFIG          (1 << 0)
  50#define RPMFILE_DOC             (1 << 1)
  51
  52enum rpm_functions_e {
  53        rpm_query = 1,
  54        rpm_install = 2,
  55        rpm_query_info = 4,
  56        rpm_query_package = 8,
  57        rpm_query_list = 16,
  58        rpm_query_list_doc = 32,
  59        rpm_query_list_config = 64
  60};
  61
  62typedef struct {
  63        uint32_t tag; /* 4 byte tag */
  64        uint32_t type; /* 4 byte type */
  65        uint32_t offset; /* 4 byte offset */
  66        uint32_t count; /* 4 byte count */
  67} rpm_index;
  68
  69static void *map;
  70static rpm_index **mytags;
  71static int tagcount;
  72
  73static void extract_cpio_gz(int fd);
  74static rpm_index **rpm_gettags(int fd, int *num_tags);
  75static int bsearch_rpmtag(const void *key, const void *item);
  76static char *rpm_getstr(int tag, int itemindex);
  77static int rpm_getint(int tag, int itemindex);
  78static int rpm_getcount(int tag);
  79static void fileaction_dobackup(char *filename, int fileref);
  80static void fileaction_setowngrp(char *filename, int fileref);
  81static void loop_through_files(int filetag, void (*fileaction)(char *filename, int fileref));
  82
  83int rpm_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  84int rpm_main(int argc, char **argv)
  85{
  86        int opt = 0, func = 0, rpm_fd, offset;
  87        const int pagesize = getpagesize();
  88
  89        while ((opt = getopt(argc, argv, "iqpldc")) != -1) {
  90                switch (opt) {
  91                case 'i': /* First arg: Install mode, with q: Information */
  92                        if (!func) func = rpm_install;
  93                        else func |= rpm_query_info;
  94                        break;
  95                case 'q': /* First arg: Query mode */
  96                        if (func) bb_show_usage();
  97                        func = rpm_query;
  98                        break;
  99                case 'p': /* Query a package */
 100                        func |= rpm_query_package;
 101                        break;
 102                case 'l': /* List files in a package */
 103                        func |= rpm_query_list;
 104                        break;
 105                case 'd': /* List doc files in a package (implies list) */
 106                        func |= rpm_query_list;
 107                        func |= rpm_query_list_doc;
 108                        break;
 109                case 'c': /* List config files in a package (implies list) */
 110                        func |= rpm_query_list;
 111                        func |= rpm_query_list_config;
 112                        break;
 113                default:
 114                        bb_show_usage();
 115                }
 116        }
 117        argv += optind;
 118        //argc -= optind;
 119        if (!argv[0]) bb_show_usage();
 120
 121        while (*argv) {
 122                rpm_fd = xopen(*argv++, O_RDONLY);
 123                mytags = rpm_gettags(rpm_fd, &tagcount);
 124                if (!mytags)
 125                        bb_error_msg_and_die("error reading rpm header");
 126                offset = xlseek(rpm_fd, 0, SEEK_CUR);
 127                /* Mimimum is one page */
 128                map = mmap(0, offset > pagesize ? (offset + offset % pagesize) : pagesize, PROT_READ, MAP_PRIVATE, rpm_fd, 0);
 129
 130                if (func & rpm_install) {
 131                        /* Backup any config files */
 132                        loop_through_files(TAG_BASENAMES, fileaction_dobackup);
 133                        /* Extact the archive */
 134                        extract_cpio_gz(rpm_fd);
 135                        /* Set the correct file uid/gid's */
 136                        loop_through_files(TAG_BASENAMES, fileaction_setowngrp);
 137                }
 138                else if ((func & (rpm_query|rpm_query_package)) == (rpm_query|rpm_query_package)) {
 139                        if (!(func & (rpm_query_info|rpm_query_list))) {
 140                                /* If just a straight query, just give package name */
 141                                printf("%s-%s-%s\n", rpm_getstr(TAG_NAME, 0), rpm_getstr(TAG_VERSION, 0), rpm_getstr(TAG_RELEASE, 0));
 142                        }
 143                        if (func & rpm_query_info) {
 144                                /* Do the nice printout */
 145                                time_t bdate_time;
 146                                struct tm *bdate;
 147                                char bdatestring[50];
 148                                printf("Name        : %-29sRelocations: %s\n", rpm_getstr(TAG_NAME, 0), rpm_getstr(TAG_PREFIXS, 0) ? rpm_getstr(TAG_PREFIXS, 0) : "(not relocateable)");
 149                                printf("Version     : %-34sVendor: %s\n", rpm_getstr(TAG_VERSION, 0), rpm_getstr(TAG_VENDOR, 0) ? rpm_getstr(TAG_VENDOR, 0) : "(none)");
 150                                bdate_time = rpm_getint(TAG_BUILDTIME, 0);
 151                                bdate = localtime((time_t *) &bdate_time);
 152                                strftime(bdatestring, 50, "%a %d %b %Y %T %Z", bdate);
 153                                printf("Release     : %-30sBuild Date: %s\n", rpm_getstr(TAG_RELEASE, 0), bdatestring);
 154                                printf("Install date: %-30sBuild Host: %s\n", "(not installed)", rpm_getstr(TAG_BUILDHOST, 0));
 155                                printf("Group       : %-30sSource RPM: %s\n", rpm_getstr(TAG_GROUP, 0), rpm_getstr(TAG_SOURCERPM, 0));
 156                                printf("Size        : %-33dLicense: %s\n", rpm_getint(TAG_SIZE, 0), rpm_getstr(TAG_LICENSE, 0));
 157                                printf("URL         : %s\n", rpm_getstr(TAG_URL, 0));
 158                                printf("Summary     : %s\n", rpm_getstr(TAG_SUMMARY, 0));
 159                                printf("Description :\n%s\n", rpm_getstr(TAG_DESCRIPTION, 0));
 160                        }
 161                        if (func & rpm_query_list) {
 162                                int count, it, flags;
 163                                count = rpm_getcount(TAG_BASENAMES);
 164                                for (it = 0; it < count; it++) {
 165                                        flags = rpm_getint(TAG_FILEFLAGS, it);
 166                                        switch (func & (rpm_query_list_doc|rpm_query_list_config)) {
 167                                        case rpm_query_list_doc:
 168                                                if (!(flags & RPMFILE_DOC)) continue;
 169                                                break;
 170                                        case rpm_query_list_config:
 171                                                if (!(flags & RPMFILE_CONFIG)) continue;
 172                                                break;
 173                                        case rpm_query_list_doc|rpm_query_list_config:
 174                                                if (!(flags & (RPMFILE_CONFIG|RPMFILE_DOC))) continue;
 175                                                break;
 176                                        }
 177                                        printf("%s%s\n",
 178                                                rpm_getstr(TAG_DIRNAMES, rpm_getint(TAG_DIRINDEXES, it)),
 179                                                rpm_getstr(TAG_BASENAMES, it));
 180                                }
 181                        }
 182                }
 183                free(mytags);
 184        }
 185        return 0;
 186}
 187
 188static void extract_cpio_gz(int fd)
 189{
 190        archive_handle_t *archive_handle;
 191        unsigned char magic[2];
 192#if BB_MMU
 193        IF_DESKTOP(long long) int FAST_FUNC (*xformer)(int src_fd, int dst_fd);
 194        enum { xformer_prog = 0 };
 195#else
 196        enum { xformer = 0 };
 197        const char *xformer_prog;
 198#endif
 199
 200        /* Initialize */
 201        archive_handle = init_handle();
 202        archive_handle->seek = seek_by_read;
 203        //archive_handle->action_header = header_list;
 204        archive_handle->action_data = data_extract_all;
 205        archive_handle->ah_flags = ARCHIVE_PRESERVE_DATE | ARCHIVE_CREATE_LEADING_DIRS
 206                /* compat: overwrite existing files.
 207                 * try "rpm -i foo.src.rpm" few times in a row -
 208                 * standard rpm will not complain.
 209                 * (TODO? real rpm creates "file;1234" and then renames it) */
 210                | ARCHIVE_EXTRACT_UNCONDITIONAL;
 211        archive_handle->src_fd = fd;
 212        /*archive_handle->offset = 0; - init_handle() did it */
 213
 214// TODO: open_zipped does the same
 215
 216        xread(archive_handle->src_fd, &magic, 2);
 217#if BB_MMU
 218        xformer = unpack_gz_stream;
 219#else
 220        xformer_prog = "gunzip";
 221#endif
 222        if (magic[0] != 0x1f || magic[1] != 0x8b) {
 223                if (!ENABLE_FEATURE_SEAMLESS_BZ2
 224                 || magic[0] != 'B' || magic[1] != 'Z'
 225                ) {
 226                        bb_error_msg_and_die("no gzip"
 227                                IF_FEATURE_SEAMLESS_BZ2("/bzip2")
 228                                " magic");
 229                }
 230#if BB_MMU
 231                xformer = unpack_bz2_stream;
 232#else
 233                xformer_prog = "bunzip2";
 234#endif
 235        } else {
 236#if !BB_MMU
 237                /* NOMMU version of open_transformer execs an external unzipper that should
 238                 * have the file position at the start of the file */
 239                xlseek(archive_handle->src_fd, 0, SEEK_SET);
 240#endif
 241        }
 242
 243        xchdir("/"); /* Install RPM's to root */
 244        open_transformer(archive_handle->src_fd, xformer, xformer_prog);
 245        archive_handle->offset = 0;
 246        while (get_header_cpio(archive_handle) == EXIT_SUCCESS)
 247                continue;
 248}
 249
 250
 251static rpm_index **rpm_gettags(int fd, int *num_tags)
 252{
 253        /* We should never need mode than 200, and realloc later */
 254        rpm_index **tags = xzalloc(200 * sizeof(tags[0]));
 255        int pass, tagindex = 0;
 256
 257        xlseek(fd, 96, SEEK_CUR); /* Seek past the unused lead */
 258
 259        /* 1st pass is the signature headers, 2nd is the main stuff */
 260        for (pass = 0; pass < 2; pass++) {
 261                struct {
 262                        char magic[3]; /* 3 byte magic: 0x8e 0xad 0xe8 */
 263                        uint8_t version; /* 1 byte version number */
 264                        uint32_t reserved; /* 4 bytes reserved */
 265                        uint32_t entries; /* Number of entries in header (4 bytes) */
 266                        uint32_t size; /* Size of store (4 bytes) */
 267                } header;
 268                struct BUG_header {
 269                        char BUG_header[sizeof(header) == 16 ? 1 : -1];
 270                };
 271                rpm_index *tmpindex;
 272                int storepos;
 273
 274                xread(fd, &header, sizeof(header));
 275                if (strncmp((char *) &header.magic, RPM_HEADER_MAGIC, 3) != 0)
 276                        return NULL; /* Invalid magic */
 277                if (header.version != 1)
 278                        return NULL; /* This program only supports v1 headers */
 279                header.size = ntohl(header.size);
 280                header.entries = ntohl(header.entries);
 281                storepos = xlseek(fd,0,SEEK_CUR) + header.entries * 16;
 282
 283                while (header.entries--) {
 284                        tmpindex = tags[tagindex++] = xmalloc(sizeof(*tmpindex));
 285                        xread(fd, tmpindex, sizeof(*tmpindex));
 286                        tmpindex->tag = ntohl(tmpindex->tag);
 287                        tmpindex->type = ntohl(tmpindex->type);
 288                        tmpindex->count = ntohl(tmpindex->count);
 289                        tmpindex->offset = storepos + ntohl(tmpindex->offset);
 290                        if (pass == 0)
 291                                tmpindex->tag -= 743;
 292                }
 293                xlseek(fd, header.size, SEEK_CUR); /* Seek past store */
 294                /* Skip padding to 8 byte boundary after reading signature headers */
 295                if (pass == 0)
 296                        xlseek(fd, (8 - (xlseek(fd,0,SEEK_CUR) % 8)) % 8, SEEK_CUR);
 297        }
 298        tags = xrealloc(tags, tagindex * sizeof(tags[0])); /* realloc tags to save space */
 299        *num_tags = tagindex;
 300        return tags; /* All done, leave the file at the start of the gzipped cpio archive */
 301}
 302
 303static int bsearch_rpmtag(const void *key, const void *item)
 304{
 305        int *tag = (int *)key;
 306        rpm_index **tmp = (rpm_index **) item;
 307        return (*tag - tmp[0]->tag);
 308}
 309
 310static int rpm_getcount(int tag)
 311{
 312        rpm_index **found;
 313        found = bsearch(&tag, mytags, tagcount, sizeof(struct rpmtag *), bsearch_rpmtag);
 314        if (!found)
 315                return 0;
 316        return found[0]->count;
 317}
 318
 319static char *rpm_getstr(int tag, int itemindex)
 320{
 321        rpm_index **found;
 322        found = bsearch(&tag, mytags, tagcount, sizeof(struct rpmtag *), bsearch_rpmtag);
 323        if (!found || itemindex >= found[0]->count)
 324                return NULL;
 325        if (found[0]->type == RPM_STRING_TYPE || found[0]->type == RPM_I18NSTRING_TYPE || found[0]->type == RPM_STRING_ARRAY_TYPE) {
 326                int n;
 327                char *tmpstr = (char *) (map + found[0]->offset);
 328                for (n=0; n < itemindex; n++)
 329                        tmpstr = tmpstr + strlen(tmpstr) + 1;
 330                return tmpstr;
 331        }
 332        return NULL;
 333}
 334
 335static int rpm_getint(int tag, int itemindex)
 336{
 337        rpm_index **found;
 338        int *tmpint; /* NB: using int8_t* would be easier to code */
 339
 340        /* gcc throws warnings here when sizeof(void*)!=sizeof(int) ...
 341         * it's ok to ignore it because tag won't be used as a pointer */
 342        found = bsearch(&tag, mytags, tagcount, sizeof(struct rpmtag *), bsearch_rpmtag);
 343        if (!found || itemindex >= found[0]->count)
 344                return -1;
 345
 346        tmpint = (int *) (map + found[0]->offset);
 347
 348        if (found[0]->type == RPM_INT32_TYPE) {
 349                tmpint = (int *) ((char *) tmpint + itemindex*4);
 350                /*return ntohl(*tmpint);*/
 351                /* int can be != int32_t */
 352                return ntohl(*(int32_t*)tmpint);
 353        }
 354        if (found[0]->type == RPM_INT16_TYPE) {
 355                tmpint = (int *) ((char *) tmpint + itemindex*2);
 356                /* ??? read int, and THEN ntohs() it?? */
 357                /*return ntohs(*tmpint);*/
 358                return ntohs(*(int16_t*)tmpint);
 359        }
 360        if (found[0]->type == RPM_INT8_TYPE) {
 361                tmpint = (int *) ((char *) tmpint + itemindex);
 362                /* ??? why we don't read byte here??? */
 363                /*return ntohs(*tmpint);*/
 364                return *(int8_t*)tmpint;
 365        }
 366        return -1;
 367}
 368
 369static void fileaction_dobackup(char *filename, int fileref)
 370{
 371        struct stat oldfile;
 372        int stat_res;
 373        char *newname;
 374        if (rpm_getint(TAG_FILEFLAGS, fileref) & RPMFILE_CONFIG) {
 375                /* Only need to backup config files */
 376                stat_res = lstat(filename, &oldfile);
 377                if (stat_res == 0 && S_ISREG(oldfile.st_mode)) {
 378                        /* File already exists  - really should check MD5's etc to see if different */
 379                        newname = xasprintf("%s.rpmorig", filename);
 380                        copy_file(filename, newname, FILEUTILS_RECUR | FILEUTILS_PRESERVE_STATUS);
 381                        remove_file(filename, FILEUTILS_RECUR | FILEUTILS_FORCE);
 382                        free(newname);
 383                }
 384        }
 385}
 386
 387static void fileaction_setowngrp(char *filename, int fileref)
 388{
 389        /* real rpm warns: "user foo does not exist - using <you>" */
 390        struct passwd *pw = getpwnam(rpm_getstr(TAG_FILEUSERNAME, fileref));
 391        int uid = pw ? pw->pw_uid : getuid(); /* or euid? */
 392        struct group *gr = getgrnam(rpm_getstr(TAG_FILEGROUPNAME, fileref));
 393        int gid = gr ? gr->gr_gid : getgid();
 394        chown(filename, uid, gid);
 395}
 396
 397static void loop_through_files(int filetag, void (*fileaction)(char *filename, int fileref))
 398{
 399        int count = 0;
 400        while (rpm_getstr(filetag, count)) {
 401                char* filename = xasprintf("%s%s",
 402                        rpm_getstr(TAG_DIRNAMES, rpm_getint(TAG_DIRINDEXES, count)),
 403                        rpm_getstr(TAG_BASENAMES, count));
 404                fileaction(filename, count++);
 405                free(filename);
 406        }
 407}
 408