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