libopkg/pkg_parse.c

   1 /* pkg_parse.c - the opkg package management system
   2
   3    Steven M. Ayer
   4
   5    Copyright (C) 2002 Compaq Computer Corporation
   6
   7    This program is free software; you can redistribute it and/or
   8    modify it under the terms of the GNU General Public License as
   9    published by the Free Software Foundation; either version 2, or (at
  10    your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful, but
  13    WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15    General Public License for more details.
  16 */
  17
  18 #include "includes.h"
  19 #include <errno.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(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(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, 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                 fprintf(stderr, "%s: failed to parse Status line for %s\n",
  94                                 __FUNCTION__, 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                 fprintf(stderr, "%s: failed to parse Conffiles line for %s\n",
 110                                 __FUNCTION__, 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                         fprintf(stderr, "%s: %s: invalid epoch: %s\n",
 134                                 __FUNCTION__, pkg->name, strerror(errno));
 135                 }
 136                 vstr = ++colon;
 137         } else {
 138                 pkg->epoch= 0;
 139         }
 140
 141         pkg->version= xstrdup(vstr);
 142         pkg->revision = strrchr(pkg->version,'-');
 143
 144         if (pkg->revision)
 145                 *pkg->revision++ = '\0';
 146
 147         return 0;
 148 }
 149
 150 static int
 151 pkg_parse_line(pkg_t *pkg, const char *line, uint mask)
 152 {
 153         /* these flags are a bit hackish... */
 154         static int reading_conffiles = 0, reading_description = 0;
 155
 156         switch (*line) {
 157         case 'A':
 158                 if ((mask & PFM_ARCHITECTURE ) && is_field("Architecture", line))
 159                         pkg->architecture = parse_simple("Architecture", line);
 160                 else if ((mask & PFM_AUTO_INSTALLED) && is_field("Auto-Installed", line)) {
 161                         char *tmp = parse_simple("Auto-Installed", line);
 162                         if (strcmp(tmp, "yes") == 0)
 163                             pkg->auto_installed = 1;
 164                         free(tmp);
 165                 }
 166                 break;
 167
 168         case 'C':
 169                 if ((mask & PFM_CONFFILES) && is_field("Conffiles", line)) {
 170                         reading_conffiles = 1;
 171                         reading_description = 0;
 172                         goto dont_reset_flags;
 173                 }
 174                 else if ((mask & PFM_CONFLICTS) && is_field("Conflicts", line))
 175                         pkg->conflicts_str = parse_comma_separated(line, &pkg->conflicts_count);
 176                 break;
 177
 178         case 'D':
 179                 if ((mask & PFM_DESCRIPTION) && is_field("Description", line)) {
 180                         pkg->description = parse_simple("Description", line);
 181                         reading_conffiles = 0;
 182                         reading_description = 1;
 183                         goto dont_reset_flags;
 184                 } else if ((mask & PFM_DEPENDS) && is_field("Depends", line))
 185                         pkg->depends_str = parse_comma_separated(line, &pkg->depends_count);
 186                 break;
 187
 188         case 'E':
 189                 if((mask & PFM_ESSENTIAL) && is_field("Essential", line)) {
 190                         char *tmp = parse_simple("Essential", line);
 191                         if (strcmp(tmp, "yes") == 0)
 192                                 pkg->essential = 1;
 193                         free(tmp);
 194                 }
 195                 break;
 196
 197         case 'F':
 198                 if((mask & PFM_FILENAME) && is_field("Filename", line))
 199                         pkg->filename = parse_simple("Filename", line);
 200                 break;
 201
 202         case 'I':
 203                 if ((mask && PFM_INSTALLED_SIZE) && is_field("Installed-Size", line))
 204                         pkg->installed_size = parse_simple("Installed-Size", line);
 205                 else if ((mask && PFM_INSTALLED_TIME) && is_field("Installed-Time", line)) {
 206                         char *tmp = parse_simple("Installed-Time", line);
 207                         pkg->installed_time = strtoul(tmp, NULL, 0);
 208                         free (tmp);
 209                 }
 210                 break;
 211
 212         case 'M':
 213                 if (mask && PFM_MD5SUM) {
 214                         if (is_field("MD5sum:", line))
 215                                 pkg->md5sum = parse_simple("MD5sum", line);
 216                         /* The old opkg wrote out status files with the wrong
 217                         * case for MD5sum, let's parse it either way */
 218                         else if (is_field("MD5Sum:", line))
 219                                 pkg->md5sum = parse_simple("MD5Sum", line);
 220                 } else if((mask & PFM_MAINTAINER) && is_field("Maintainer", line))
 221                         pkg->maintainer = parse_simple("Maintainer", line);
 222                 break;
 223
 224         case 'P':
 225                 if ((mask & PFM_PACKAGE) && is_field("Package", line))
 226                         pkg->name = parse_simple("Package", line);
 227                 else if ((mask & PFM_PRIORITY) && is_field("Priority", line))
 228                         pkg->priority = parse_simple("Priority", line);
 229                 else if ((mask & PFM_PROVIDES) && is_field("Provides", line))
 230                         pkg->provides_str = parse_comma_separated(line, &pkg->provides_count);
 231                 else if ((mask & PFM_PRE_DEPENDS) && is_field("Pre-Depends", line))
 232                         pkg->pre_depends_str = parse_comma_separated(line, &pkg->pre_depends_count);
 233                 break;
 234
 235         case 'R':
 236                 if ((mask & PFM_RECOMMENDS) && is_field("Recommends", line))
 237                         pkg->recommends_str = parse_comma_separated(line, &pkg->recommends_count);
 238                 else if ((mask & PFM_REPLACES) && is_field("Replaces", line))
 239                         pkg->replaces_str = parse_comma_separated(line, &pkg->replaces_count);
 240
 241                 break;
 242
 243         case 'S':
 244                 if ((mask & PFM_SECTION) && is_field("Section", line))
 245                         pkg->section = parse_simple("Section", line);
 246 #ifdef HAVE_SHA256
 247                 else if ((mask & PFM_SHA256SUM) && is_field("SHA256sum", line))
 248                         pkg->sha256sum = parse_simple("SHA256sum", line);
 249 #endif
 250                 else if ((mask & PFM_SIZE) && is_field("Size", line))
 251                         pkg->size = parse_simple("Size", line);
 252                 else if ((mask & PFM_SOURCE) && is_field("Source", line))
 253                         pkg->source = parse_simple("Source", line);
 254                 else if ((mask & PFM_STATUS) && is_field("Status", line))
 255                         parse_status(pkg, line);
 256                 else if ((mask & PFM_SUGGESTS) && is_field("Suggests", line))
 257                         pkg->suggests_str = parse_comma_separated(line, &pkg->suggests_count);
 258                 break;
 259
 260         case 'T':
 261                 if ((mask & PFM_TAGS) && is_field("Tags", line))
 262                         pkg->tags = parse_simple("Tags", line);
 263                 break;
 264
 265         case 'V':
 266                 if ((mask & PFM_VERSION) && is_field("Version", line))
 267                         parse_version(pkg, line);
 268                 break;
 269
 270         case ' ':
 271                 if ((mask & PFM_DESCRIPTION) && reading_description) {
 272                         pkg->description = xrealloc(pkg->description,
 273                                                 strlen(pkg->description)
 274                                                 + 1 + strlen(line) + 1);
 275                         strcat(pkg->description, "\n");
 276                         strcat(pkg->description, (line));
 277                         goto dont_reset_flags;
 278                 } else if ((mask && PFM_CONFFILES) && reading_conffiles) {
 279                         parse_conffiles(pkg, line);
 280                         goto dont_reset_flags;
 281                 }
 282                 break;
 283
 284         default:
 285                 /* For package lists, signifies end of package. */
 286                 if(line_is_blank(line))
 287                         return 1;
 288         }
 289
 290         reading_description = 0;
 291         reading_conffiles = 0;
 292
 293 dont_reset_flags:
 294
 295         return 0;
 296 }
 297
 298 int
 299 pkg_parse_from_stream_nomalloc(pkg_t *pkg, FILE *fp, uint mask,
 300                                                 char **buf0, size_t buf0len)
 301 {
 302         int ret, lineno;
 303         char *buf, *nl;
 304         size_t buflen;
 305
 306         lineno = 1;
 307         ret = 0;
 308
 309         buflen = buf0len;
 310         buf = *buf0;
 311         buf[0] = '\0';
 312
 313         while (1) {
 314                 if (fgets(buf, buflen, fp) == NULL) {
 315                         if (ferror(fp)) {
 316                                 fprintf(stderr, "%s: fgets: %s\n",
 317                                         __FUNCTION__, strerror(errno));
 318                                 ret = -1;
 319                         } else if (strlen(*buf0) == buflen-1) {
 320                                 fprintf(stderr, "%s: missing new line character"
 321                                                 " at end of file!\n",
 322                                         __FUNCTION__);
 323                                 pkg_parse_line(pkg, *buf0, mask);
 324                         }
 325                         break;
 326                 }
 327
 328                 nl = strchr(buf, '\n');
 329                 if (nl == NULL) {
 330                         if (strlen(buf) < buflen-1) {
 331                                 /*
 332                                  * Line could be exactly buflen-1 long and
 333                                  * missing a newline, but we won't know until
 334                                  * fgets fails to read more data.
 335                                  */
 336                                 fprintf(stderr, "%s: missing new line character"
 337                                                 " at end of file!\n",
 338                                         __FUNCTION__);
 339                                 pkg_parse_line(pkg, *buf0, mask);
 340                                 break;
 341                         }
 342                         if (buf0len >= EXCESSIVE_LINE_LEN) {
 343                                 fprintf(stderr, "%s: excessively long line at "
 344                                         "%d. Corrupt file?\n",
 345                                         __FUNCTION__, lineno);
 346                                 ret = -1;
 347                                 break;
 348                         }
 349
 350                         /*
 351                          * Realloc and move buf past the data already read.
 352                          * |<--------------- buf0len ----------------->|
 353                          * |                     |<------- buflen ---->|
 354                          * |---------------------|---------------------|
 355                          * buf0                   buf
 356                          */
 357                         buflen = buf0len;
 358                         buf0len *= 2;
 359                         *buf0 = xrealloc(*buf0, buf0len);
 360                         buf = *buf0 + buflen -1;
 361
 362                         continue;
 363                 }
 364
 365                 *nl = '\0';
 366
 367                 lineno++;
 368
 369                 if (pkg_parse_line(pkg, *buf0, mask))
 370                         break;
 371
 372                 buf = *buf0;
 373                 buflen = buf0len;
 374                 buf[0] = '\0';
 375         };
 376
 377         if (pkg->name == NULL) {
 378                 /* probably just a blank line */
 379                 ret = EINVAL;
 380         }
 381
 382         return ret;
 383 }
 384
 385 int
 386 pkg_parse_from_stream(pkg_t *pkg, FILE *fp, uint mask)
 387 {
 388         int ret;
 389         char *buf;
 390         const size_t len = 4096;
 391
 392         buf = xmalloc(len);
 393         ret = pkg_parse_from_stream_nomalloc(pkg, fp, mask, &buf, len);
 394         free(buf);
 395
 396         return ret;
 397 }