usr.sbin/asf/asf.c

   1 /*
   2  * Copyright (c) 2002, 2003 Greg Lehey
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * This software is provided by the author ``as is'' and any express
  15  * or implied warranties, including, but not limited to, the implied
  16  * warranties of merchantability and fitness for a particular purpose
  17  * are disclaimed.  In no event shall the author be liable for any
  18  * direct, indirect, incidental, special, exemplary, or consequential
  19  * damages (including, but not limited to, procurement of substitute
  20  * goods or services; loss of use, data, or profits; or business
  21  * interruption) however caused and on any theory of liability,
  22  * whether in contract, strict liability, or tort (including
  23  * negligence or otherwise) arising in any way out of the use of this
  24  * software, even if advised of the possibility of such damage.
  25  */
  26 /* $Id: asf.c,v 1.6 2003/11/04 06:38:37 green Exp $ */
  27 /* $FreeBSD: src/usr.sbin/asf/asf.c,v 1.6 2003/11/04 06:38:37 green Exp $ */
  28 /* $DragonFly: src/usr.sbin/asf/asf.c,v 1.8 2008/09/19 17:49:31 swildner Exp $ */
  29
  30 #define MAXLINE 1024
  31 #include <ctype.h>
  32 #include <errno.h>
  33 #include <stdio.h>
  34 #include <stdlib.h>
  35 #include <string.h>
  36 #include <sys/file.h>
  37 #include <sys/param.h>
  38 #include <sys/stat.h>
  39 #include <sys/wait.h>
  40 #include <sys/types.h>
  41 #include <fts.h>
  42 #include <unistd.h>
  43
  44 #define MAXTOKEN 10
  45 const char *modules_path;               /* path relative to kernel
  46                                          * build directory */
  47 const char *outfile;                    /* and where to write the output */
  48
  49 /*
  50  * Take a blank separated list of tokens and turn it into a list of
  51  * individual nul-delimited strings.  Build a list of pointers at
  52  * token, which must have enough space for the tokens.  Return the
  53  * number of tokens, or -1 on error (typically a missing string
  54  * delimiter).
  55  */
  56 static int
  57 tokenize(char *cptr, char *token[], int maxtoken)
  58 {
  59     char delim;                         /* delimiter to search for */
  60     int tokennr;                        /* index of this token */
  61
  62     for (tokennr = 0; tokennr < maxtoken;) {
  63         while (isspace(*cptr))
  64             cptr++;                     /* skip initial white space */
  65         if ((*cptr == '\0') || (*cptr == '\n')
  66             || (*cptr == '#'))          /* end of line */
  67             return tokennr;             /* return number of tokens found */
  68         delim = *cptr;
  69         token[tokennr] = cptr;          /* point to it */
  70         tokennr++;                      /* one more */
  71         if (tokennr == maxtoken)        /* run off the end? */
  72             return tokennr;
  73         if ((delim == '\'') || (delim == '"')) { /* delimitered */
  74             for (;;) {
  75                 cptr++;
  76                 if ((*cptr == delim)
  77                     && (cptr[-1] != '\\')) { /* found the partner */
  78                     cptr++;             /* move on past */
  79                     if (!isspace(*cptr)) /* no space after closing quote */
  80                         return -1;
  81                     *cptr++ = '\0';     /* delimit */
  82                 } else if ((*cptr == '\0')
  83                     || (*cptr == '\n')) /* end of line */
  84                     return -1;
  85             }
  86         } else {                        /* not quoted */
  87             while ((*cptr != '\0') && (!isspace(*cptr)) && (*cptr != '\n'))
  88                 cptr++;
  89             if (*cptr != '\0')          /* not end of the line, */
  90                 *cptr++ = '\0';         /* delimit and move to the next */
  91         }
  92     }
  93     return maxtoken;                    /* can't get here */
  94 }
  95
  96 static char *
  97 findmodule(char *mod_path, const char *module_name)
  98 {
  99     char *const path_argv[2] = { mod_path, NULL };
 100     char *module_path = NULL;
 101     size_t module_name_len = strlen(module_name);
 102     FTS *fts;
 103     FTSENT *ftsent;
 104
 105     if (mod_path == NULL) {
 106         fprintf(stderr,
 107             "Can't allocate memory to traverse a path: %s (%d)\n",
 108             strerror(errno),
 109             errno);
 110         exit(1);
 111     }
 112     fts = fts_open(path_argv, FTS_PHYSICAL | FTS_NOCHDIR, NULL);
 113     if (fts == NULL) {
 114         fprintf(stderr,
 115             "Can't begin traversing path %s: %s (%d)\n",
 116             mod_path,
 117             strerror(errno),
 118             errno);
 119         exit(1);
 120     }
 121     while ((ftsent = fts_read(fts)) != NULL) {
 122         if (ftsent->fts_info == FTS_DNR ||
 123             ftsent->fts_info == FTS_ERR ||
 124             ftsent->fts_info == FTS_NS) {
 125             fprintf(stderr,
 126                 "Error while traversing path %s: %s (%d)\n",
 127                 mod_path,
 128                 strerror(errno),
 129                 errno);
 130             exit(1);
 131         }
 132         if (ftsent->fts_info != FTS_F ||
 133             ftsent->fts_namelen != module_name_len ||
 134             memcmp(module_name, ftsent->fts_name, module_name_len) != 0)
 135                 continue;
 136         if (asprintf(&module_path,
 137             "%.*s",
 138             (int)ftsent->fts_pathlen,
 139             ftsent->fts_path) == -1) {
 140             fprintf(stderr,
 141                 "Can't allocate memory traversing path %s: %s (%d)\n",
 142                 mod_path,
 143                 strerror(errno),
 144                 errno);
 145             exit(1);
 146         }
 147         break;
 148     }
 149     if (ftsent == NULL && errno != 0) {
 150         fprintf(stderr,
 151             "Couldn't complete traversing path %s: %s (%d)\n",
 152             mod_path,
 153             strerror(errno),
 154             errno);
 155         exit(1);
 156     }
 157     fts_close(fts);
 158     free(mod_path);
 159     return (module_path);
 160 }
 161
 162 static void
 163 usage(const char *myname)
 164 {
 165     fprintf(stderr,
 166         "Usage:\n"
 167         "%s [-a] [-f] [-k] [modules-path [outfile]]\n\n"
 168         "\t-a\tappend to outfile)\n"
 169         "\t-f\tfind the module in any subdirectory of module-path\n"
 170         "\t-k\ttake input from kldstat(8)\n",
 171         myname);
 172 }
 173
 174 int
 175 main(int argc, char *argv[])
 176 {
 177     char buf[MAXLINE];
 178     FILE *kldstat;
 179     FILE *objcopy;
 180     FILE *out;                          /* output file */
 181     char ocbuf[MAXLINE];
 182     int tokens;                         /* number of tokens on line */
 183     int ch;
 184     const char *filemode = "w";         /* mode for outfile */
 185     char cwd[MAXPATHLEN];               /* current directory */
 186     char *token[MAXTOKEN];
 187     int dofind = 0;
 188
 189     getcwd(cwd, MAXPATHLEN);            /* find where we are */
 190     kldstat = stdin;
 191     while ((ch = getopt(argc, argv, "afk")) != -1) {
 192         switch (ch) {
 193         case 'k': /* get input from kldstat(8) */
 194             if (!(kldstat = popen("kldstat", "r"))) {
 195                 perror("Can't start kldstat");
 196                 return 1;
 197             }
 198             break;
 199         case 'a': /* append to outfile */
 200             filemode = "a";
 201             break;
 202         case 'f': /* find .ko (recursively) */
 203             dofind = 1;
 204             break;
 205         default:
 206             usage(argv[0]);
 207             return 1;
 208         }
 209     }
 210
 211     argv += optind;
 212     argc -= optind;
 213
 214     if (argc >= 1) {
 215         modules_path = argv[0];
 216         argc--;
 217         argv++;
 218     }
 219
 220     if (argc >= 1) {
 221         outfile = argv[0];
 222         argc--;
 223         argv++;
 224     }
 225
 226     if (argc > 0) {
 227         fprintf(stderr,
 228             "Extraneous startup information: \"%s\", aborting\n",
 229             argv[0]);
 230         usage(getprogname());
 231         return 1;
 232     }
 233     if (modules_path == NULL)
 234         modules_path = "/boot/modules";
 235     if (outfile == NULL)
 236         outfile = ".asf";
 237     if ((out = fopen(outfile, filemode)) == NULL) {
 238         fprintf(stderr,
 239             "Can't open output file %s: %s (%d)\n",
 240             outfile,
 241             strerror(errno),
 242             errno);
 243         return 1;
 244     }
 245     while (fgets(buf, MAXLINE, kldstat)) {
 246         if ((!(strstr(buf, "kernel")))
 247             && buf[0] != 'I') {
 248             long long base;
 249             long long textaddr = 0;
 250             long long dataaddr = 0;
 251             long long bssaddr = 0;
 252
 253             tokens = tokenize(buf, token, MAXTOKEN);
 254             if (tokens <= 1)
 255                 continue;
 256             base = strtoll(token[2], NULL, 16);
 257             if (!dofind) {
 258                 snprintf(ocbuf,
 259                     MAXLINE,
 260                     "/usr/bin/objdump --section-headers %s/%s",
 261                     modules_path,
 262                     token[4]);
 263             } else {
 264                 char *modpath;
 265
 266                 modpath = findmodule(strdup(modules_path), token[4]);
 267                 if (modpath == NULL)
 268                     continue;
 269                 snprintf(ocbuf,
 270                     MAXLINE,
 271                     "/usr/bin/objdump --section-headers %s",
 272                     modpath);
 273                 free(modpath);
 274             }
 275             if (!(objcopy = popen(ocbuf, "r"))) {
 276                 fprintf(stderr,
 277                     "Can't start %s: %s (%d)\n",
 278                     ocbuf,
 279                     strerror(errno),
 280                     errno);
 281                 return 1;
 282             }
 283             while (fgets(ocbuf, MAXLINE, objcopy)) {
 284                 int octokens;
 285                 char *octoken[MAXTOKEN];
 286
 287                 octokens = tokenize(ocbuf, octoken, MAXTOKEN);
 288                 if (octokens > 1) {
 289                     if (!strcmp(octoken[1], ".text"))
 290                         textaddr = strtoll(octoken[3], NULL, 16) + base;
 291                     else if (!strcmp(octoken[1], ".data"))
 292                         dataaddr = strtoll(octoken[3], NULL, 16) + base;
 293                     else if (!strcmp(octoken[1], ".bss"))
 294                         bssaddr = strtoll(octoken[3], NULL, 16) + base;
 295                 }
 296             }
 297             if (textaddr) {             /* we must have a text address */
 298                 if (!dofind) {
 299                     fprintf(out,
 300                         "add-symbol-file %s%s%s/%s 0x%llx",
 301                         modules_path[0] != '/' ? cwd : "",
 302                         modules_path[0] != '/' ? "/" : "",
 303                         modules_path,
 304                         token[4],
 305                         textaddr);
 306                 } else {
 307                     char *modpath;
 308
 309                     modpath = findmodule(strdup(modules_path), token[4]);
 310                     if (modpath == NULL)
 311                         continue;
 312                     fprintf(out,
 313                         "add-symbol-file %s 0x%llx",
 314                         modpath,
 315                         textaddr);
 316                     free(modpath);
 317                 }
 318                 if (dataaddr)
 319                     fprintf(out, " -s .data 0x%llx", dataaddr);
 320                 if (bssaddr)
 321                     fprintf(out, " -s .bss 0x%llx", bssaddr);
 322                 fprintf(out, "\n");
 323             }
 324         }
 325     }
 326     return 0;
 327 }