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 isGenericFieldType(char * type, const char * line)
  28 {
  29     if(!strncmp(line, type, strlen(type)))
  30         return 1;
  31     return 0;
  32 }
  33
  34 static char * parseGenericFieldType(char * type, const char * raw)
  35 {
  36     const char * field_value = raw + (strlen(type) + 1);
  37     return trim_alloc(field_value);
  38 }
  39
  40 static void parseStatus(pkg_t *pkg, const char * raw)
  41 {
  42     char sw_str[64], sf_str[64], ss_str[64];
  43
  44     sscanf(raw, "Status: %s %s %s", sw_str, sf_str, ss_str);
  45     pkg->state_want = pkg_state_want_from_str(sw_str);
  46     pkg->state_flag = pkg_state_flag_from_str(sf_str);
  47     pkg->state_status = pkg_state_status_from_str(ss_str);
  48 }
  49
  50 static char ** parseDependsString(const char * raw, int * depends_count)
  51 {
  52     char ** depends = NULL;
  53     int line_count = 0;
  54     char buff[2048], * dest;
  55
  56     while(raw && *raw && !isspace(*raw)) {
  57         raw++;
  58     }
  59
  60     if(line_is_blank(raw)){
  61         *depends_count = line_count;
  62         return NULL;
  63     }
  64     while(raw && *raw){
  65         depends = xrealloc(depends, sizeof(char *) * (line_count + 1));
  66
  67         while(isspace(*raw)) raw++;
  68
  69         dest = buff;
  70         while((*raw != ',') && *raw)
  71             *dest++ = *raw++;
  72
  73         *dest = '\0';
  74         depends[line_count] = trim_alloc(buff);
  75         if(depends[line_count] ==NULL)
  76            return NULL;
  77         line_count++;
  78         if(*raw == ',')
  79             raw++;
  80     }
  81     *depends_count = line_count;
  82     return depends;
  83 }
  84
  85 static void parseConffiles(pkg_t * pkg, const char * raw)
  86 {
  87     char file_name[1048], md5sum[1048];  /* please tell me there aren't any longer that 1k */
  88
  89     if(!strncmp(raw, "Conffiles:", 10))
  90         raw += strlen("Conffiles:");
  91
  92     while(*raw && (sscanf(raw, "%s%s", file_name, md5sum) == 2)){
  93         conffile_list_append(&pkg->conffiles, file_name, md5sum);
  94         /*      fprintf(stderr, "%s %s ", file_name, md5sum);*/
  95         while (*raw && isspace(*raw)) {
  96             raw++;
  97         }
  98         raw += strlen(file_name);
  99         while (*raw && isspace(*raw)) {
 100             raw++;
 101         }
 102         raw += strlen(md5sum);
 103     }
 104 }
 105
 106 int parseVersion(pkg_t *pkg, const char *raw)
 107 {
 108   char *colon, *eepochcolon;
 109   char *hyphen;
 110   unsigned long epoch;
 111
 112   if (!*raw) {
 113       fprintf(stderr, "%s: ERROR: version string is empty", __FUNCTION__);
 114       return EINVAL;
 115   }
 116
 117   if (strncmp(raw, "Version:", 8) == 0) {
 118       raw += 8;
 119   }
 120   while (*raw && isspace(*raw)) {
 121       raw++;
 122   }
 123
 124   colon= strchr(raw,':');
 125   if (colon) {
 126     epoch= strtoul(raw,&eepochcolon,10);
 127     if (colon != eepochcolon) {
 128         fprintf(stderr, "%s: ERROR: epoch in version is not number", __FUNCTION__);
 129         return EINVAL;
 130     }
 131     if (!*++colon) {
 132         fprintf(stderr, "%s: ERROR: nothing after colon in version number", __FUNCTION__);
 133         return EINVAL;
 134     }
 135     raw= colon;
 136     pkg->epoch= epoch;
 137   } else {
 138     pkg->epoch= 0;
 139   }
 140
 141   pkg->revision = "";
 142
 143   if (!pkg->version)
 144   {
 145     pkg->version= xcalloc(1, strlen(raw)+1);
 146     strcpy(pkg->version, raw);
 147   }
 148
 149   hyphen= strrchr(pkg->version,'-');
 150
 151   if (hyphen) {
 152     *hyphen++= 0;
 153       pkg->revision = hyphen;
 154   }
 155
 156   return 0;
 157 }
 158
 159 static int
 160 pkg_parse_line(pkg_t *pkg, const char *line, uint mask)
 161 {
 162         /* these flags are a bit hackish... */
 163         static int reading_conffiles = 0, reading_description = 0;
 164
 165         switch (*line) {
 166         case 'A':
 167             if((mask & PFM_ARCHITECTURE ) && isGenericFieldType("Architecture:", line))
 168                 pkg->architecture = parseGenericFieldType("Architecture", line);
 169             else if((mask & PFM_AUTO_INSTALLED) && isGenericFieldType("Auto-Installed:", line)) {
 170                 char *auto_installed_value;
 171                 auto_installed_value = parseGenericFieldType("Auto-Installed:", line);
 172                 if (strcmp(auto_installed_value, "yes") == 0) {
 173                     pkg->auto_installed = 1;
 174                 }
 175                 free(auto_installed_value);
 176             }
 177             break;
 178
 179         case 'C':
 180             if((mask & PFM_CONFFILES) && isGenericFieldType("Conffiles", line)){
 181                 parseConffiles(pkg, line);
 182                 reading_conffiles = 1;
 183                 reading_description = 0;
 184                 goto dont_reset_flags;
 185             }
 186             else if((mask & PFM_CONFLICTS) && isGenericFieldType("Conflicts", line))
 187                 pkg->conflicts_str = parseDependsString(line, &pkg->conflicts_count);
 188             break;
 189
 190         case 'D':
 191             if((mask & PFM_DESCRIPTION) && isGenericFieldType("Description", line)) {
 192                 pkg->description = parseGenericFieldType("Description", line);
 193                 reading_conffiles = 0;
 194                 reading_description = 1;
 195                 goto dont_reset_flags;
 196             }
 197             else if((mask & PFM_DEPENDS) && isGenericFieldType("Depends", line))
 198                 pkg->depends_str = parseDependsString(line, &pkg->depends_count);
 199             break;
 200
 201         case 'E':
 202             if((mask & PFM_ESSENTIAL) && isGenericFieldType("Essential:", line)) {
 203                 char *essential_value;
 204                 essential_value = parseGenericFieldType("Essential", line);
 205                 if (strcmp(essential_value, "yes") == 0) {
 206                     pkg->essential = 1;
 207                 }
 208                 free(essential_value);
 209             }
 210             break;
 211
 212         case 'F':
 213             if((mask & PFM_FILENAME) && isGenericFieldType("Filename:", line))
 214                 pkg->filename = parseGenericFieldType("Filename", line);
 215             break;
 216
 217         case 'I':
 218             if((mask && PFM_INSTALLED_SIZE) && isGenericFieldType("Installed-Size:", line))
 219                 pkg->installed_size = parseGenericFieldType("Installed-Size", line);
 220             else if((mask && PFM_INSTALLED_TIME) && isGenericFieldType("Installed-Time:", line)) {
 221                 char *time_str = parseGenericFieldType("Installed-Time", line);
 222                 pkg->installed_time = strtoul(time_str, NULL, 0);
 223                 free (time_str);
 224             }
 225             break;
 226
 227         case 'M':
 228             if(mask && PFM_MD5SUM) {
 229                 if (isGenericFieldType("MD5sum:", line))
 230                         pkg->md5sum = parseGenericFieldType("MD5sum", line);
 231                         /* The old opkg wrote out status files with the wrong
 232                          * case for MD5sum, let's parse it either way */
 233                 else if(isGenericFieldType("MD5Sum:", line))
 234                         pkg->md5sum = parseGenericFieldType("MD5Sum", line);
 235             } else if((mask & PFM_MAINTAINER) && isGenericFieldType("Maintainer", line))
 236                 pkg->maintainer = parseGenericFieldType("Maintainer", line);
 237             break;
 238
 239         case 'P':
 240             if((mask & PFM_PACKAGE) && isGenericFieldType("Package:", line))
 241                 pkg->name = parseGenericFieldType("Package", line);
 242             else if((mask & PFM_PRIORITY) && isGenericFieldType("Priority:", line))
 243                 pkg->priority = parseGenericFieldType("Priority", line);
 244             else if((mask & PFM_PROVIDES) && isGenericFieldType("Provides", line)){
 245                 pkg->provides_str = parseDependsString(line, &pkg->provides_count);
 246             }
 247             else if((mask & PFM_PRE_DEPENDS) && isGenericFieldType("Pre-Depends", line))
 248                 pkg->pre_depends_str = parseDependsString(line, &pkg->pre_depends_count);
 249             break;
 250
 251         case 'R':
 252             if((mask & PFM_RECOMMENDS) && isGenericFieldType("Recommends", line))
 253                 pkg->recommends_str = parseDependsString(line, &pkg->recommends_count);
 254             else if((mask & PFM_REPLACES) && isGenericFieldType("Replaces", line))
 255                 pkg->replaces_str = parseDependsString(line, &pkg->replaces_count);
 256
 257             break;
 258
 259         case 'S':
 260             if((mask & PFM_SECTION) && isGenericFieldType("Section:", line))
 261                 pkg->section = parseGenericFieldType("Section", line);
 262 #ifdef HAVE_SHA256
 263             else if((mask & PFM_SHA256SUM) && isGenericFieldType("SHA256sum:", line))
 264                 pkg->sha256sum = parseGenericFieldType("SHA256sum", line);
 265 #endif
 266             else if((mask & PFM_SIZE) && isGenericFieldType("Size:", line))
 267                 pkg->size = parseGenericFieldType("Size", line);
 268             else if((mask & PFM_SOURCE) && isGenericFieldType("Source:", line))
 269                 pkg->source = parseGenericFieldType("Source", line);
 270             else if((mask & PFM_STATUS) && isGenericFieldType("Status", line))
 271                 parseStatus(pkg, line);
 272             else if((mask & PFM_SUGGESTS) && isGenericFieldType("Suggests", line))
 273                 pkg->suggests_str = parseDependsString(line, &pkg->suggests_count);
 274             break;
 275
 276         case 'T':
 277             if((mask & PFM_TAGS) && isGenericFieldType("Tags:", line))
 278                 pkg->tags = parseGenericFieldType("Tags", line);
 279             break;
 280
 281         case 'V':
 282             if((mask & PFM_VERSION) && isGenericFieldType("Version", line))
 283                 parseVersion(pkg, line);
 284             break;
 285
 286         case ' ':
 287             if((mask & PFM_DESCRIPTION) && reading_description) {
 288                 /* we already know it's not blank, so the rest of description */
 289                 pkg->description = xrealloc(pkg->description,
 290                                            strlen(pkg->description)
 291                                            + 1 + strlen(line) + 1);
 292                 strcat(pkg->description, "\n");
 293                 strcat(pkg->description, (line));
 294                 goto dont_reset_flags;
 295             }
 296             else if((mask && PFM_CONFFILES) && reading_conffiles) {
 297                 parseConffiles(pkg, line);
 298                 goto dont_reset_flags;
 299             }
 300             break;
 301
 302         default:
 303             /* For package lists, signifies end of package. */
 304             if(line_is_blank(line)) {
 305                 return 1;
 306             }
 307         }
 308
 309         reading_description = 0;
 310         reading_conffiles = 0;
 311
 312 dont_reset_flags:
 313
 314         return 0;
 315 }
 316
 317 int
 318 pkg_parse_from_stream_nomalloc(pkg_t *pkg, FILE *fp, uint mask,
 319                                                 char **buf0, size_t buf0len)
 320 {
 321         int ret, lineno;
 322         char *buf, *nl;
 323         size_t buflen;
 324
 325         lineno = 1;
 326         ret = 0;
 327
 328         buflen = buf0len;
 329         buf = *buf0;
 330         buf[0] = '\0';
 331
 332         while (1) {
 333                 if (fgets(buf, buflen, fp) == NULL) {
 334                         if (ferror(fp)) {
 335                                 fprintf(stderr, "%s: fgets: %s\n",
 336                                         __FUNCTION__, strerror(errno));
 337                                 ret = -1;
 338                         } else if (strlen(*buf0) == buflen-1) {
 339                                 fprintf(stderr, "%s: missing new line character"
 340                                                 " at end of file!\n",
 341                                         __FUNCTION__);
 342                                 pkg_parse_line(pkg, *buf0, mask);
 343                         }
 344                         break;
 345                 }
 346
 347                 nl = strchr(buf, '\n');
 348                 if (nl == NULL) {
 349                         if (strlen(buf) < buflen-1) {
 350                                 /*
 351                                  * Line could be exactly buflen-1 long and
 352                                  * missing a newline, but we won't know until
 353                                  * fgets fails to read more data.
 354                                  */
 355                                 fprintf(stderr, "%s: missing new line character"
 356                                                 " at end of file!\n",
 357                                         __FUNCTION__);
 358                                 pkg_parse_line(pkg, *buf0, mask);
 359                                 break;
 360                         }
 361                         if (buf0len >= EXCESSIVE_LINE_LEN) {
 362                                 fprintf(stderr, "%s: excessively long line at "
 363                                         "%d. Corrupt file?\n",
 364                                         __FUNCTION__, lineno);
 365                                 ret = -1;
 366                                 break;
 367                         }
 368
 369                         /*
 370                          * Realloc and move buf past the data already read.
 371                          * |<--------------- buf0len ----------------->|
 372                          * |                     |<------- buflen ---->|
 373                          * |---------------------|---------------------|
 374                          * buf0                   buf
 375                          */
 376                         buflen = buf0len;
 377                         buf0len *= 2;
 378                         *buf0 = xrealloc(*buf0, buf0len);
 379                         buf = *buf0 + buflen -1;
 380
 381                         continue;
 382                 }
 383
 384                 *nl = '\0';
 385
 386                 lineno++;
 387
 388                 if (pkg_parse_line(pkg, *buf0, mask))
 389                         break;
 390
 391                 buf = *buf0;
 392                 buflen = buf0len;
 393                 buf[0] = '\0';
 394         };
 395
 396         if (pkg->name == NULL) {
 397                 /* probably just a blank line */
 398                 ret = EINVAL;
 399         }
 400
 401         return ret;
 402 }
 403
 404 int
 405 pkg_parse_from_stream(pkg_t *pkg, FILE *fp, uint mask)
 406 {
 407         int ret;
 408         char *buf;
 409         const size_t len = 4096;
 410
 411         buf = xmalloc(len);
 412         ret = pkg_parse_from_stream_nomalloc(pkg, fp, mask, &buf, len);
 413         free(buf);
 414
 415         return ret;
 416 }