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
  86 parseConffiles(pkg_t *pkg, const char *cstr)
  87 {
  88         char file_name[1024], md5sum[35];
  89
  90         if (sscanf(cstr, "%1023s %34s", file_name, md5sum) != 2) {
  91                 fprintf(stderr, "%s: failed to parse Conffiles line for %s\n",
  92                                 __FUNCTION__, pkg->name);
  93                 return;
  94         }
  95
  96         conffile_list_append(&pkg->conffiles, file_name, md5sum);
  97 }
  98
  99 int
 100 parseVersion(pkg_t *pkg, const char *vstr)
 101 {
 102         char *colon;
 103
 104         if (strncmp(vstr, "Version:", 8) == 0)
 105                 vstr += 8;
 106
 107         while (*vstr && isspace(*vstr))
 108                 vstr++;
 109
 110         colon = strchr(vstr, ':');
 111         if (colon) {
 112                 errno = 0;
 113                 pkg->epoch = strtoul(vstr, NULL, 10);
 114                 if (errno) {
 115                         fprintf(stderr, "%s: %s: invalid epoch: %s\n",
 116                                 __FUNCTION__, pkg->name, strerror(errno));
 117                 }
 118                 vstr = ++colon;
 119         } else {
 120                 pkg->epoch= 0;
 121         }
 122
 123         pkg->version= xstrdup(vstr);
 124         pkg->revision = strrchr(pkg->version,'-');
 125
 126         if (pkg->revision)
 127                 *pkg->revision++ = '\0';
 128
 129         return 0;
 130 }
 131
 132 static int
 133 pkg_parse_line(pkg_t *pkg, const char *line, uint mask)
 134 {
 135         /* these flags are a bit hackish... */
 136         static int reading_conffiles = 0, reading_description = 0;
 137
 138         switch (*line) {
 139         case 'A':
 140             if((mask & PFM_ARCHITECTURE ) && isGenericFieldType("Architecture:", line))
 141                 pkg->architecture = parseGenericFieldType("Architecture", line);
 142             else if((mask & PFM_AUTO_INSTALLED) && isGenericFieldType("Auto-Installed:", line)) {
 143                 char *auto_installed_value;
 144                 auto_installed_value = parseGenericFieldType("Auto-Installed:", line);
 145                 if (strcmp(auto_installed_value, "yes") == 0) {
 146                     pkg->auto_installed = 1;
 147                 }
 148                 free(auto_installed_value);
 149             }
 150             break;
 151
 152         case 'C':
 153             if((mask & PFM_CONFFILES) && isGenericFieldType("Conffiles", line)){
 154                 reading_conffiles = 1;
 155                 reading_description = 0;
 156                 goto dont_reset_flags;
 157             }
 158             else if((mask & PFM_CONFLICTS) && isGenericFieldType("Conflicts", line))
 159                 pkg->conflicts_str = parseDependsString(line, &pkg->conflicts_count);
 160             break;
 161
 162         case 'D':
 163             if((mask & PFM_DESCRIPTION) && isGenericFieldType("Description", line)) {
 164                 pkg->description = parseGenericFieldType("Description", line);
 165                 reading_conffiles = 0;
 166                 reading_description = 1;
 167                 goto dont_reset_flags;
 168             }
 169             else if((mask & PFM_DEPENDS) && isGenericFieldType("Depends", line))
 170                 pkg->depends_str = parseDependsString(line, &pkg->depends_count);
 171             break;
 172
 173         case 'E':
 174             if((mask & PFM_ESSENTIAL) && isGenericFieldType("Essential:", line)) {
 175                 char *essential_value;
 176                 essential_value = parseGenericFieldType("Essential", line);
 177                 if (strcmp(essential_value, "yes") == 0) {
 178                     pkg->essential = 1;
 179                 }
 180                 free(essential_value);
 181             }
 182             break;
 183
 184         case 'F':
 185             if((mask & PFM_FILENAME) && isGenericFieldType("Filename:", line))
 186                 pkg->filename = parseGenericFieldType("Filename", line);
 187             break;
 188
 189         case 'I':
 190             if((mask && PFM_INSTALLED_SIZE) && isGenericFieldType("Installed-Size:", line))
 191                 pkg->installed_size = parseGenericFieldType("Installed-Size", line);
 192             else if((mask && PFM_INSTALLED_TIME) && isGenericFieldType("Installed-Time:", line)) {
 193                 char *time_str = parseGenericFieldType("Installed-Time", line);
 194                 pkg->installed_time = strtoul(time_str, NULL, 0);
 195                 free (time_str);
 196             }
 197             break;
 198
 199         case 'M':
 200             if(mask && PFM_MD5SUM) {
 201                 if (isGenericFieldType("MD5sum:", line))
 202                         pkg->md5sum = parseGenericFieldType("MD5sum", line);
 203                         /* The old opkg wrote out status files with the wrong
 204                          * case for MD5sum, let's parse it either way */
 205                 else if(isGenericFieldType("MD5Sum:", line))
 206                         pkg->md5sum = parseGenericFieldType("MD5Sum", line);
 207             } else if((mask & PFM_MAINTAINER) && isGenericFieldType("Maintainer", line))
 208                 pkg->maintainer = parseGenericFieldType("Maintainer", line);
 209             break;
 210
 211         case 'P':
 212             if((mask & PFM_PACKAGE) && isGenericFieldType("Package:", line))
 213                 pkg->name = parseGenericFieldType("Package", line);
 214             else if((mask & PFM_PRIORITY) && isGenericFieldType("Priority:", line))
 215                 pkg->priority = parseGenericFieldType("Priority", line);
 216             else if((mask & PFM_PROVIDES) && isGenericFieldType("Provides", line)){
 217                 pkg->provides_str = parseDependsString(line, &pkg->provides_count);
 218             }
 219             else if((mask & PFM_PRE_DEPENDS) && isGenericFieldType("Pre-Depends", line))
 220                 pkg->pre_depends_str = parseDependsString(line, &pkg->pre_depends_count);
 221             break;
 222
 223         case 'R':
 224             if((mask & PFM_RECOMMENDS) && isGenericFieldType("Recommends", line))
 225                 pkg->recommends_str = parseDependsString(line, &pkg->recommends_count);
 226             else if((mask & PFM_REPLACES) && isGenericFieldType("Replaces", line))
 227                 pkg->replaces_str = parseDependsString(line, &pkg->replaces_count);
 228
 229             break;
 230
 231         case 'S':
 232             if((mask & PFM_SECTION) && isGenericFieldType("Section:", line))
 233                 pkg->section = parseGenericFieldType("Section", line);
 234 #ifdef HAVE_SHA256
 235             else if((mask & PFM_SHA256SUM) && isGenericFieldType("SHA256sum:", line))
 236                 pkg->sha256sum = parseGenericFieldType("SHA256sum", line);
 237 #endif
 238             else if((mask & PFM_SIZE) && isGenericFieldType("Size:", line))
 239                 pkg->size = parseGenericFieldType("Size", line);
 240             else if((mask & PFM_SOURCE) && isGenericFieldType("Source:", line))
 241                 pkg->source = parseGenericFieldType("Source", line);
 242             else if((mask & PFM_STATUS) && isGenericFieldType("Status", line))
 243                 parseStatus(pkg, line);
 244             else if((mask & PFM_SUGGESTS) && isGenericFieldType("Suggests", line))
 245                 pkg->suggests_str = parseDependsString(line, &pkg->suggests_count);
 246             break;
 247
 248         case 'T':
 249             if((mask & PFM_TAGS) && isGenericFieldType("Tags:", line))
 250                 pkg->tags = parseGenericFieldType("Tags", line);
 251             break;
 252
 253         case 'V':
 254             if((mask & PFM_VERSION) && isGenericFieldType("Version", line))
 255                 parseVersion(pkg, line);
 256             break;
 257
 258         case ' ':
 259             if((mask & PFM_DESCRIPTION) && reading_description) {
 260                 /* we already know it's not blank, so the rest of description */
 261                 pkg->description = xrealloc(pkg->description,
 262                                            strlen(pkg->description)
 263                                            + 1 + strlen(line) + 1);
 264                 strcat(pkg->description, "\n");
 265                 strcat(pkg->description, (line));
 266                 goto dont_reset_flags;
 267             }
 268             else if((mask && PFM_CONFFILES) && reading_conffiles) {
 269                 parseConffiles(pkg, line);
 270                 goto dont_reset_flags;
 271             }
 272             break;
 273
 274         default:
 275             /* For package lists, signifies end of package. */
 276             if(line_is_blank(line)) {
 277                 return 1;
 278             }
 279         }
 280
 281         reading_description = 0;
 282         reading_conffiles = 0;
 283
 284 dont_reset_flags:
 285
 286         return 0;
 287 }
 288
 289 int
 290 pkg_parse_from_stream_nomalloc(pkg_t *pkg, FILE *fp, uint mask,
 291                                                 char **buf0, size_t buf0len)
 292 {
 293         int ret, lineno;
 294         char *buf, *nl;
 295         size_t buflen;
 296
 297         lineno = 1;
 298         ret = 0;
 299
 300         buflen = buf0len;
 301         buf = *buf0;
 302         buf[0] = '\0';
 303
 304         while (1) {
 305                 if (fgets(buf, buflen, fp) == NULL) {
 306                         if (ferror(fp)) {
 307                                 fprintf(stderr, "%s: fgets: %s\n",
 308                                         __FUNCTION__, strerror(errno));
 309                                 ret = -1;
 310                         } else if (strlen(*buf0) == buflen-1) {
 311                                 fprintf(stderr, "%s: missing new line character"
 312                                                 " at end of file!\n",
 313                                         __FUNCTION__);
 314                                 pkg_parse_line(pkg, *buf0, mask);
 315                         }
 316                         break;
 317                 }
 318
 319                 nl = strchr(buf, '\n');
 320                 if (nl == NULL) {
 321                         if (strlen(buf) < buflen-1) {
 322                                 /*
 323                                  * Line could be exactly buflen-1 long and
 324                                  * missing a newline, but we won't know until
 325                                  * fgets fails to read more data.
 326                                  */
 327                                 fprintf(stderr, "%s: missing new line character"
 328                                                 " at end of file!\n",
 329                                         __FUNCTION__);
 330                                 pkg_parse_line(pkg, *buf0, mask);
 331                                 break;
 332                         }
 333                         if (buf0len >= EXCESSIVE_LINE_LEN) {
 334                                 fprintf(stderr, "%s: excessively long line at "
 335                                         "%d. Corrupt file?\n",
 336                                         __FUNCTION__, lineno);
 337                                 ret = -1;
 338                                 break;
 339                         }
 340
 341                         /*
 342                          * Realloc and move buf past the data already read.
 343                          * |<--------------- buf0len ----------------->|
 344                          * |                     |<------- buflen ---->|
 345                          * |---------------------|---------------------|
 346                          * buf0                   buf
 347                          */
 348                         buflen = buf0len;
 349                         buf0len *= 2;
 350                         *buf0 = xrealloc(*buf0, buf0len);
 351                         buf = *buf0 + buflen -1;
 352
 353                         continue;
 354                 }
 355
 356                 *nl = '\0';
 357
 358                 lineno++;
 359
 360                 if (pkg_parse_line(pkg, *buf0, mask))
 361                         break;
 362
 363                 buf = *buf0;
 364                 buflen = buf0len;
 365                 buf[0] = '\0';
 366         };
 367
 368         if (pkg->name == NULL) {
 369                 /* probably just a blank line */
 370                 ret = EINVAL;
 371         }
 372
 373         return ret;
 374 }
 375
 376 int
 377 pkg_parse_from_stream(pkg_t *pkg, FILE *fp, uint mask)
 378 {
 379         int ret;
 380         char *buf;
 381         const size_t len = 4096;
 382
 383         buf = xmalloc(len);
 384         ret = pkg_parse_from_stream_nomalloc(pkg, fp, mask, &buf, len);
 385         free(buf);
 386
 387         return ret;
 388 }