libopkg/pkg_parse.c

   1 /* pkg_parse.c - the opkg package management system
   2
   3    Copyright (C) 2009 Ubiq Technologies <graham.gower@gmail.com>
   4
   5    Steven M. Ayer
   6    Copyright (C) 2002 Compaq Computer Corporation
   7
   8    This program is free software; you can redistribute it and/or
   9    modify it under the terms of the GNU General Public License as
  10    published by the Free Software Foundation; either version 2, or (at
  11    your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful, but
  14    WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16    General Public License for more details.
  17 */
  18
  19 #include "config.h"
  20
  21 #include <stdio.h>
  22 #include <ctype.h>
  23
  24 #include "pkg.h"
  25 #include "opkg_utils.h"
  26 #include "pkg_parse.h"
  27 #include "libbb/libbb.h"
  28
  29 static int
  30 is_field(const char *type, const char *line)
  31 {
  32         if (!strncmp(line, type, strlen(type)))
  33                 return 1;
  34         return 0;
  35 }
  36
  37 static char *
  38 parse_simple(const char *type, const char *line)
  39 {
  40         return trim_xstrdup(line + strlen(type) + 1);
  41 }
  42
  43 /*
  44  * Parse a comma separated string into an array.
  45  */
  46 static char **
  47 parse_comma_separated(const char *raw, unsigned int *count)
  48 {
  49         char **depends = NULL;
  50         const char *start, *end;
  51         int line_count = 0;
  52
  53         /* skip past the "Field:" marker */
  54         while (*raw && *raw != ':')
  55                 raw++;
  56         raw++;
  57
  58         if (line_is_blank(raw)) {
  59                 *count = line_count;
  60                 return NULL;
  61         }
  62
  63         while (*raw) {
  64                 depends = xrealloc(depends, sizeof(char *) * (line_count + 1));
  65
  66                 while (isspace(*raw))
  67                         raw++;
  68
  69                 start = raw;
  70                 while (*raw != ',' && *raw)
  71                         raw++;
  72                 end = raw;
  73
  74                 while (end > start && isspace(*end))
  75                         end--;
  76
  77                 depends[line_count] = xstrndup(start, end-start);
  78
  79                 line_count++;
  80                 if (*raw == ',')
  81                     raw++;
  82         }
  83
  84         *count = line_count;
  85         return depends;
  86 }
  87
  88 static void
  89 parse_status(pkg_t *pkg, const char *sstr)
  90 {
  91         char sw_str[64], sf_str[64], ss_str[64];
  92
  93         if (sscanf(sstr, "Status: %63s %63s %63s",
  94                                 sw_str, sf_str, ss_str) != 3) {
  95                 opkg_msg(ERROR, "Failed to parse Status line for %s\n",
  96                                 pkg->name);
  97                 return;
  98         }
  99
 100         pkg->state_want = pkg_state_want_from_str(sw_str);
 101         pkg->state_flag = pkg_state_flag_from_str(sf_str);
 102         pkg->state_status = pkg_state_status_from_str(ss_str);
 103 }
 104
 105 static void
 106 parse_conffiles(pkg_t *pkg, const char *cstr)
 107 {
 108         char file_name[1024], md5sum[35];
 109
 110         if (sscanf(cstr, "%1023s %34s", file_name, md5sum) != 2) {
 111                 opkg_msg(ERROR, "Failed to parse Conffiles line for %s\n",
 112                                 pkg->name);
 113                 return;
 114         }
 115
 116         conffile_list_append(&pkg->conffiles, file_name, md5sum);
 117 }
 118
 119 int
 120 parse_version(pkg_t *pkg, const char *vstr)
 121 {
 122         char *colon;
 123
 124         if (strncmp(vstr, "Version:", 8) == 0)
 125                 vstr += 8;
 126
 127         while (*vstr && isspace(*vstr))
 128                 vstr++;
 129
 130         colon = strchr(vstr, ':');
 131         if (colon) {
 132                 errno = 0;
 133                 pkg->epoch = strtoul(vstr, NULL, 10);
 134                 if (errno) {
 135                         opkg_perror(ERROR, "%s: invalid epoch", pkg->name);
 136                 }
 137                 vstr = ++colon;
 138         } else {
 139                 pkg->epoch= 0;
 140         }
 141
 142         pkg->version= xstrdup(vstr);
 143         pkg->revision = strrchr(pkg->version,'-');
 144
 145         if (pkg->revision)
 146                 *pkg->revision++ = '\0';
 147
 148         return 0;
 149 }
 150
 151 static int
 152 pkg_parse_line(pkg_t *pkg, const char *line, uint mask)
 153 {
 154         /* these flags are a bit hackish... */
 155         static int reading_conffiles = 0, reading_description = 0;
 156         int ret = 0;
 157
 158         /* Exclude globally masked fields. */
 159         mask |= conf->pfm;
 160
 161         /* Flip the semantics of the mask. */
 162         mask ^= PFM_ALL;
 163
 164         switch (*line) {
 165         case 'A':
 166                 if ((mask & PFM_ARCHITECTURE ) && is_field("Architecture", line))
 167                         pkg->architecture = parse_simple("Architecture", line);
 168                 else if ((mask & PFM_AUTO_INSTALLED) && is_field("Auto-Installed", line)) {
 169                         char *tmp = parse_simple("Auto-Installed", line);
 170                         if (strcmp(tmp, "yes") == 0)
 171                             pkg->auto_installed = 1;
 172                         free(tmp);
 173                 }
 174                 break;
 175
 176         case 'C':
 177                 if ((mask & PFM_CONFFILES) && is_field("Conffiles", line)) {
 178                         reading_conffiles = 1;
 179                         reading_description = 0;
 180                         goto dont_reset_flags;
 181                 }
 182                 else if ((mask & PFM_CONFLICTS) && is_field("Conflicts", line))
 183                         pkg->conflicts_str = parse_comma_separated(line, &pkg->conflicts_count);
 184                 break;
 185
 186         case 'D':
 187                 if ((mask & PFM_DESCRIPTION) && is_field("Description", line)) {
 188                         pkg->description = parse_simple("Description", line);
 189                         reading_conffiles = 0;
 190                         reading_description = 1;
 191                         goto dont_reset_flags;
 192                 } else if ((mask & PFM_DEPENDS) && is_field("Depends", line))
 193                         pkg->depends_str = parse_comma_separated(line, &pkg->depends_count);
 194                 break;
 195
 196         case 'E':
 197                 if((mask & PFM_ESSENTIAL) && is_field("Essential", line)) {
 198                         char *tmp = parse_simple("Essential", line);
 199                         if (strcmp(tmp, "yes") == 0)
 200                                 pkg->essential = 1;
 201                         free(tmp);
 202                 }
 203                 break;
 204
 205         case 'F':
 206                 if((mask & PFM_FILENAME) && is_field("Filename", line))
 207                         pkg->filename = parse_simple("Filename", line);
 208                 break;
 209
 210         case 'I':
 211                 if ((mask && PFM_INSTALLED_SIZE) && is_field("Installed-Size", line)) {
 212                         char *tmp = parse_simple("Installed-Size", line);
 213                         pkg->installed_size = strtoul(tmp, NULL, 0);
 214                         free (tmp);
 215                 } else if ((mask && PFM_INSTALLED_TIME) && is_field("Installed-Time", line)) {
 216                         char *tmp = parse_simple("Installed-Time", line);
 217                         pkg->installed_time = strtoul(tmp, NULL, 0);
 218                         free (tmp);
 219                 }
 220                 break;
 221
 222         case 'M':
 223                 if (mask && PFM_MD5SUM) {
 224                         if (is_field("MD5sum:", line))
 225                                 pkg->md5sum = parse_simple("MD5sum", line);
 226                         /* The old opkg wrote out status files with the wrong
 227                         * case for MD5sum, let's parse it either way */
 228                         else if (is_field("MD5Sum:", line))
 229                                 pkg->md5sum = parse_simple("MD5Sum", line);
 230                 } else if((mask & PFM_MAINTAINER) && is_field("Maintainer", line))
 231                         pkg->maintainer = parse_simple("Maintainer", line);
 232                 break;
 233
 234         case 'P':
 235                 if ((mask & PFM_PACKAGE) && is_field("Package", line))
 236                         pkg->name = parse_simple("Package", line);
 237                 else if ((mask & PFM_PRIORITY) && is_field("Priority", line))
 238                         pkg->priority = parse_simple("Priority", line);
 239                 else if ((mask & PFM_PROVIDES) && is_field("Provides", line))
 240                         pkg->provides_str = parse_comma_separated(line, &pkg->provides_count);
 241                 else if ((mask & PFM_PRE_DEPENDS) && is_field("Pre-Depends", line))
 242                         pkg->pre_depends_str = parse_comma_separated(line, &pkg->pre_depends_count);
 243                 break;
 244
 245         case 'R':
 246                 if ((mask & PFM_RECOMMENDS) && is_field("Recommends", line))
 247                         pkg->recommends_str = parse_comma_separated(line, &pkg->recommends_count);
 248                 else if ((mask & PFM_REPLACES) && is_field("Replaces", line))
 249                         pkg->replaces_str = parse_comma_separated(line, &pkg->replaces_count);
 250
 251                 break;
 252
 253         case 'S':
 254                 if ((mask & PFM_SECTION) && is_field("Section", line))
 255                         pkg->section = parse_simple("Section", line);
 256 #ifdef HAVE_SHA256
 257                 else if ((mask & PFM_SHA256SUM) && is_field("SHA256sum", line))
 258                         pkg->sha256sum = parse_simple("SHA256sum", line);
 259 #endif
 260                 else if ((mask & PFM_SIZE) && is_field("Size", line)) {
 261                         char *tmp = parse_simple("Size", line);
 262                         pkg->size = strtoul(tmp, NULL, 0);
 263                         free (tmp);
 264                 } else if ((mask & PFM_SOURCE) && is_field("Source", line))
 265                         pkg->source = parse_simple("Source", line);
 266                 else if ((mask & PFM_STATUS) && is_field("Status", line))
 267                         parse_status(pkg, line);
 268                 else if ((mask & PFM_SUGGESTS) && is_field("Suggests", line))
 269                         pkg->suggests_str = parse_comma_separated(line, &pkg->suggests_count);
 270                 break;
 271
 272         case 'T':
 273                 if ((mask & PFM_TAGS) && is_field("Tags", line))
 274                         pkg->tags = parse_simple("Tags", line);
 275                 break;
 276
 277         case 'V':
 278                 if ((mask & PFM_VERSION) && is_field("Version", line))
 279                         parse_version(pkg, line);
 280                 break;
 281
 282         case ' ':
 283                 if ((mask & PFM_DESCRIPTION) && reading_description) {
 284                         pkg->description = xrealloc(pkg->description,
 285                                                 strlen(pkg->description)
 286                                                 + 1 + strlen(line) + 1);
 287                         strcat(pkg->description, "\n");
 288                         strcat(pkg->description, (line));
 289                         goto dont_reset_flags;
 290                 } else if ((mask && PFM_CONFFILES) && reading_conffiles) {
 291                         parse_conffiles(pkg, line);
 292                         goto dont_reset_flags;
 293                 }
 294
 295                 /* FALLTHROUGH */
 296         default:
 297                 /* For package lists, signifies end of package. */
 298                 if(line_is_blank(line)) {
 299                         ret = 1;
 300                         break;
 301                 }
 302         }
 303
 304         reading_description = 0;
 305         reading_conffiles = 0;
 306
 307 dont_reset_flags:
 308
 309         return ret;
 310 }
 311
 312 int
 313 pkg_parse_from_stream_nomalloc(pkg_t *pkg, FILE *fp, uint mask,
 314                                                 char **buf0, size_t buf0len)
 315 {
 316         int ret, lineno;
 317         char *buf, *nl;
 318         size_t buflen;
 319
 320         lineno = 1;
 321         ret = 0;
 322
 323         buflen = buf0len;
 324         buf = *buf0;
 325         buf[0] = '\0';
 326
 327         while (1) {
 328                 if (fgets(buf, (int)buflen, fp) == NULL) {
 329                         if (ferror(fp)) {
 330                                 opkg_perror(ERROR, "fgets");
 331                                 ret = -1;
 332                         } else if (strlen(*buf0) == buf0len-1) {
 333                                 opkg_msg(ERROR, "Missing new line character"
 334                                                 " at end of file!\n");
 335                                 pkg_parse_line(pkg, *buf0, mask);
 336                         }
 337                         break;
 338                 }
 339
 340                 nl = strchr(buf, '\n');
 341                 if (nl == NULL) {
 342                         if (strlen(buf) < buflen-1) {
 343                                 /*
 344                                  * Line could be exactly buflen-1 long and
 345                                  * missing a newline, but we won't know until
 346                                  * fgets fails to read more data.
 347                                  */
 348                                 opkg_msg(ERROR, "Missing new line character"
 349                                                 " at end of file!\n");
 350                                 pkg_parse_line(pkg, *buf0, mask);
 351                                 break;
 352                         }
 353                         if (buf0len >= EXCESSIVE_LINE_LEN) {
 354                                 opkg_msg(ERROR, "Excessively long line at "
 355                                         "%d. Corrupt file?\n",
 356                                         lineno);
 357                                 ret = -1;
 358                                 break;
 359                         }
 360
 361                         /*
 362                          * Realloc and point buf past the data already read,
 363                          * at the NULL terminator inserted by fgets.
 364                          * |<--------------- buf0len ----------------->|
 365                          * |                     |<------- buflen ---->|
 366                          * |---------------------|---------------------|
 367                          * buf0                   buf
 368                          */
 369                         buflen = buf0len +1;
 370                         buf0len *= 2;
 371                         *buf0 = xrealloc(*buf0, buf0len);
 372                         buf = *buf0 + buflen -2;
 373
 374                         continue;
 375                 }
 376
 377                 *nl = '\0';
 378
 379                 lineno++;
 380
 381                 if (pkg_parse_line(pkg, *buf0, mask))
 382                         break;
 383
 384                 buf = *buf0;
 385                 buflen = buf0len;
 386                 buf[0] = '\0';
 387         };
 388
 389         if (pkg->name == NULL) {
 390                 /* probably just a blank line */
 391                 ret = 1;
 392         }
 393
 394         return ret;
 395 }
 396
 397 int
 398 pkg_parse_from_stream(pkg_t *pkg, FILE *fp, uint mask)
 399 {
 400         int ret;
 401         char *buf;
 402         const size_t len = 4096;
 403
 404         buf = xmalloc(len);
 405         ret = pkg_parse_from_stream_nomalloc(pkg, fp, mask, &buf, len);
 406         free(buf);
 407
 408         return ret;
 409 }