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
  52 enum 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
  62 typedef 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
  69 static void *map;
  70 static rpm_index **mytags;
  71 static int tagcount;
  72
  73 static void extract_cpio_gz(int fd);
  74 static rpm_index **rpm_gettags(int fd, int *num_tags);
  75 static int bsearch_rpmtag(const void *key, const void *item);
  76 static char *rpm_getstr(int tag, int itemindex);
  77 static int rpm_getint(int tag, int itemindex);
  78 static int rpm_getcount(int tag);
  79 static void fileaction_dobackup(char *filename, int fileref);
  80 static void fileaction_setowngrp(char *filename, int fileref);
  81 static void loop_through_files(int filetag, void (*fileaction)(char *filename, int fileref));
  82
  83 int rpm_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  84 int 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
 188 static void extract_cpio_gz(int fd)
 189 {
 190         archive_handle_t *archive_handle;
 191         unsigned char magic[2];
 192 #if BB_MMU
 193         USE_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                                 USE_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
 251 static 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
 303 static 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
 310 static 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
 319 static 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
 335 static 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
 369 static 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
 387 static 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
 397 static 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 }