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
 107 parseVersion(pkg_t *pkg, const char *vstr)
 108 {
 109         char *colon;
 110
 111         if (strncmp(vstr, "Version:", 8) == 0)
 112                 vstr += 8;
 113
 114         while (*vstr && isspace(*vstr))
 115                 vstr++;
 116
 117         colon = strchr(vstr, ':');
 118         if (colon) {
 119                 errno = 0;
 120                 pkg->epoch = strtoul(vstr, NULL, 10);
 121                 if (errno) {
 122                         fprintf(stderr, "%s: %s: invalid epoch: %s\n",
 123                                 __FUNCTION__, pkg->name, strerror(errno));
 124                 }
 125                 vstr = ++colon;
 126         } else {
 127                 pkg->epoch= 0;
 128         }
 129
 130         pkg->version= xstrdup(vstr);
 131         pkg->revision = strrchr(pkg->version,'-');
 132
 133         if (pkg->revision)
 134                 *pkg->revision++ = '\0';
 135
 136         return 0;
 137 }
 138
 139 static int
 140 pkg_parse_line(pkg_t *pkg, const char *line, uint mask)
 141 {
 142         /* these flags are a bit hackish... */
 143         static int reading_conffiles = 0, reading_description = 0;
 144
 145         switch (*line) {
 146         case 'A':
 147             if((mask & PFM_ARCHITECTURE ) && isGenericFieldType("Architecture:", line))
 148                 pkg->architecture = parseGenericFieldType("Architecture", line);
 149             else if((mask & PFM_AUTO_INSTALLED) && isGenericFieldType("Auto-Installed:", line)) {
 150                 char *auto_installed_value;
 151                 auto_installed_value = parseGenericFieldType("Auto-Installed:", line);
 152                 if (strcmp(auto_installed_value, "yes") == 0) {
 153                     pkg->auto_installed = 1;
 154                 }
 155                 free(auto_installed_value);
 156             }
 157             break;
 158
 159         case 'C':
 160             if((mask & PFM_CONFFILES) && isGenericFieldType("Conffiles", line)){
 161                 parseConffiles(pkg, line);
 162                 reading_conffiles = 1;
 163                 reading_description = 0;
 164                 goto dont_reset_flags;
 165             }
 166             else if((mask & PFM_CONFLICTS) && isGenericFieldType("Conflicts", line))
 167                 pkg->conflicts_str = parseDependsString(line, &pkg->conflicts_count);
 168             break;
 169
 170         case 'D':
 171             if((mask & PFM_DESCRIPTION) && isGenericFieldType("Description", line)) {
 172                 pkg->description = parseGenericFieldType("Description", line);
 173                 reading_conffiles = 0;
 174                 reading_description = 1;
 175                 goto dont_reset_flags;
 176             }
 177             else if((mask & PFM_DEPENDS) && isGenericFieldType("Depends", line))
 178                 pkg->depends_str = parseDependsString(line, &pkg->depends_count);
 179             break;
 180
 181         case 'E':
 182             if((mask & PFM_ESSENTIAL) && isGenericFieldType("Essential:", line)) {
 183                 char *essential_value;
 184                 essential_value = parseGenericFieldType("Essential", line);
 185                 if (strcmp(essential_value, "yes") == 0) {
 186                     pkg->essential = 1;
 187                 }
 188                 free(essential_value);
 189             }
 190             break;
 191
 192         case 'F':
 193             if((mask & PFM_FILENAME) && isGenericFieldType("Filename:", line))
 194                 pkg->filename = parseGenericFieldType("Filename", line);
 195             break;
 196
 197         case 'I':
 198             if((mask && PFM_INSTALLED_SIZE) && isGenericFieldType("Installed-Size:", line))
 199                 pkg->installed_size = parseGenericFieldType("Installed-Size", line);
 200             else if((mask && PFM_INSTALLED_TIME) && isGenericFieldType("Installed-Time:", line)) {
 201                 char *time_str = parseGenericFieldType("Installed-Time", line);
 202                 pkg->installed_time = strtoul(time_str, NULL, 0);
 203                 free (time_str);
 204             }
 205             break;
 206
 207         case 'M':
 208             if(mask && PFM_MD5SUM) {
 209                 if (isGenericFieldType("MD5sum:", line))
 210                         pkg->md5sum = parseGenericFieldType("MD5sum", line);
 211                         /* The old opkg wrote out status files with the wrong
 212                          * case for MD5sum, let's parse it either way */
 213                 else if(isGenericFieldType("MD5Sum:", line))
 214                         pkg->md5sum = parseGenericFieldType("MD5Sum", line);
 215             } else if((mask & PFM_MAINTAINER) && isGenericFieldType("Maintainer", line))
 216                 pkg->maintainer = parseGenericFieldType("Maintainer", line);
 217             break;
 218
 219         case 'P':
 220             if((mask & PFM_PACKAGE) && isGenericFieldType("Package:", line))
 221                 pkg->name = parseGenericFieldType("Package", line);
 222             else if((mask & PFM_PRIORITY) && isGenericFieldType("Priority:", line))
 223                 pkg->priority = parseGenericFieldType("Priority", line);
 224             else if((mask & PFM_PROVIDES) && isGenericFieldType("Provides", line)){
 225                 pkg->provides_str = parseDependsString(line, &pkg->provides_count);
 226             }
 227             else if((mask & PFM_PRE_DEPENDS) && isGenericFieldType("Pre-Depends", line))
 228                 pkg->pre_depends_str = parseDependsString(line, &pkg->pre_depends_count);
 229             break;
 230
 231         case 'R':
 232             if((mask & PFM_RECOMMENDS) && isGenericFieldType("Recommends", line))
 233                 pkg->recommends_str = parseDependsString(line, &pkg->recommends_count);
 234             else if((mask & PFM_REPLACES) && isGenericFieldType("Replaces", line))
 235                 pkg->replaces_str = parseDependsString(line, &pkg->replaces_count);
 236
 237             break;
 238
 239         case 'S':
 240             if((mask & PFM_SECTION) && isGenericFieldType("Section:", line))
 241                 pkg->section = parseGenericFieldType("Section", line);
 242 #ifdef HAVE_SHA256
 243             else if((mask & PFM_SHA256SUM) && isGenericFieldType("SHA256sum:", line))
 244                 pkg->sha256sum = parseGenericFieldType("SHA256sum", line);
 245 #endif
 246             else if((mask & PFM_SIZE) && isGenericFieldType("Size:", line))
 247                 pkg->size = parseGenericFieldType("Size", line);
 248             else if((mask & PFM_SOURCE) && isGenericFieldType("Source:", line))
 249                 pkg->source = parseGenericFieldType("Source", line);
 250             else if((mask & PFM_STATUS) && isGenericFieldType("Status", line))
 251                 parseStatus(pkg, line);
 252             else if((mask & PFM_SUGGESTS) && isGenericFieldType("Suggests", line))
 253                 pkg->suggests_str = parseDependsString(line, &pkg->suggests_count);
 254             break;
 255
 256         case 'T':
 257             if((mask & PFM_TAGS) && isGenericFieldType("Tags:", line))
 258                 pkg->tags = parseGenericFieldType("Tags", line);
 259             break;
 260
 261         case 'V':
 262             if((mask & PFM_VERSION) && isGenericFieldType("Version", line))
 263                 parseVersion(pkg, line);
 264             break;
 265
 266         case ' ':
 267             if((mask & PFM_DESCRIPTION) && reading_description) {
 268                 /* we already know it's not blank, so the rest of description */
 269                 pkg->description = xrealloc(pkg->description,
 270                                            strlen(pkg->description)
 271                                            + 1 + strlen(line) + 1);
 272                 strcat(pkg->description, "\n");
 273                 strcat(pkg->description, (line));
 274                 goto dont_reset_flags;
 275             }
 276             else if((mask && PFM_CONFFILES) && reading_conffiles) {
 277                 parseConffiles(pkg, line);
 278                 goto dont_reset_flags;
 279             }
 280             break;
 281
 282         default:
 283             /* For package lists, signifies end of package. */
 284             if(line_is_blank(line)) {
 285                 return 1;
 286             }
 287         }
 288
 289         reading_description = 0;
 290         reading_conffiles = 0;
 291
 292 dont_reset_flags:
 293
 294         return 0;
 295 }
 296
 297 int
 298 pkg_parse_from_stream_nomalloc(pkg_t *pkg, FILE *fp, uint mask,
 299                                                 char **buf0, size_t buf0len)
 300 {
 301         int ret, lineno;
 302         char *buf, *nl;
 303         size_t buflen;
 304
 305         lineno = 1;
 306         ret = 0;
 307
 308         buflen = buf0len;
 309         buf = *buf0;
 310         buf[0] = '\0';
 311
 312         while (1) {
 313                 if (fgets(buf, buflen, fp) == NULL) {
 314                         if (ferror(fp)) {
 315                                 fprintf(stderr, "%s: fgets: %s\n",
 316                                         __FUNCTION__, strerror(errno));
 317                                 ret = -1;
 318                         } else if (strlen(*buf0) == buflen-1) {
 319                                 fprintf(stderr, "%s: missing new line character"
 320                                                 " at end of file!\n",
 321                                         __FUNCTION__);
 322                                 pkg_parse_line(pkg, *buf0, mask);
 323                         }
 324                         break;
 325                 }
 326
 327                 nl = strchr(buf, '\n');
 328                 if (nl == NULL) {
 329                         if (strlen(buf) < buflen-1) {
 330                                 /*
 331                                  * Line could be exactly buflen-1 long and
 332                                  * missing a newline, but we won't know until
 333                                  * fgets fails to read more data.
 334                                  */
 335                                 fprintf(stderr, "%s: missing new line character"
 336                                                 " at end of file!\n",
 337                                         __FUNCTION__);
 338                                 pkg_parse_line(pkg, *buf0, mask);
 339                                 break;
 340                         }
 341                         if (buf0len >= EXCESSIVE_LINE_LEN) {
 342                                 fprintf(stderr, "%s: excessively long line at "
 343                                         "%d. Corrupt file?\n",
 344                                         __FUNCTION__, lineno);
 345                                 ret = -1;
 346                                 break;
 347                         }
 348
 349                         /*
 350                          * Realloc and move buf past the data already read.
 351                          * |<--------------- buf0len ----------------->|
 352                          * |                     |<------- buflen ---->|
 353                          * |---------------------|---------------------|
 354                          * buf0                   buf
 355                          */
 356                         buflen = buf0len;
 357                         buf0len *= 2;
 358                         *buf0 = xrealloc(*buf0, buf0len);
 359                         buf = *buf0 + buflen -1;
 360
 361                         continue;
 362                 }
 363
 364                 *nl = '\0';
 365
 366                 lineno++;
 367
 368                 if (pkg_parse_line(pkg, *buf0, mask))
 369                         break;
 370
 371                 buf = *buf0;
 372                 buflen = buf0len;
 373                 buf[0] = '\0';
 374         };
 375
 376         if (pkg->name == NULL) {
 377                 /* probably just a blank line */
 378                 ret = EINVAL;
 379         }
 380
 381         return ret;
 382 }
 383
 384 int
 385 pkg_parse_from_stream(pkg_t *pkg, FILE *fp, uint mask)
 386 {
 387         int ret;
 388         char *buf;
 389         const size_t len = 4096;
 390
 391         buf = xmalloc(len);
 392         ret = pkg_parse_from_stream_nomalloc(pkg, fp, mask, &buf, len);
 393         free(buf);
 394
 395         return ret;
 396 }