src/export/cfgexport.c

   1 /*
   2  * Copyright 2000, International Business Machines Corporation and others.
   3  * All Rights Reserved.
   4  *
   5  * This software has been released under the terms of the IBM Public
   6  * License.  For details, see the LICENSE file in the top-level source
   7  * directory or online at http://www.openafs.org/dl/license10.html
   8  */
   9
  10 /*
  11  * cfgexport -  load/configure the EXPORT kernel extension
  12  */
  13 #include <afsconfig.h>
  14 #include <afs/param.h>
  15
  16
  17 #include <errno.h>
  18 #include <stdio.h>
  19 #include <fcntl.h>
  20 #include <sys/types.h>
  21 #include <sys/device.h>
  22 #include <sys/sysconfig.h>
  23 #include <sys/uio.h>
  24 #include <sys/xcoff.h>
  25 #include <sys/ldr.h>
  26 #include <setjmp.h>
  27 #include <signal.h>
  28 #include "export.h"
  29 #include "sym.h"
  30
  31 extern char *malloc(), *optarg;
  32 extern int sysconfig(int cmd, void *arg, int len);
  33
  34 int debug = 0;
  35 char *syms = "/unix";
  36 char *xstrings;
  37
  38 #include "AFS_component_version_number.c"
  39
  40 main(argc, argv)
  41      char **argv;
  42 {
  43     int add, del, opts;
  44     int c;
  45     char *file;
  46     mid_t kmid;
  47     struct cfg_load cload;
  48     struct cfg_kmod cmod;
  49     struct k_conf conf;
  50     FILE *fp;
  51
  52 #ifdef  AFS_AIX32_ENV
  53     /*
  54      * The following signal action for AIX is necessary so that in case of a
  55      * crash (i.e. core is generated) we can include the user's data section
  56      * in the core dump. Unfortunately, by default, only a partial core is
  57      * generated which, in many cases, isn't too useful.
  58      */
  59     struct sigaction nsa;
  60
  61     sigemptyset(&nsa.sa_mask);
  62     nsa.sa_handler = SIG_DFL;
  63     nsa.sa_flags = SA_FULLDUMP;
  64     sigaction(SIGSEGV, &nsa, NULL);
  65 #endif
  66     add = del = 0;
  67
  68     while ((c = getopt(argc, argv, "a:s:Z:d:")) != EOF) {
  69         switch (c) {
  70         case 'Z':               /* Zdebug option        */
  71             ++debug;
  72             break;
  73
  74         case 'a':
  75             add = 1;
  76             file = optarg;
  77             if (!file)
  78                 usage();
  79             break;
  80
  81         case 'd':
  82             del = 1;
  83             file = optarg;
  84             if (!file)
  85                 usage();
  86             break;
  87
  88         case 's':
  89             syms = optarg;
  90             break;
  91
  92         default:
  93             usage();
  94             break;
  95         }
  96     }
  97
  98     if (!add && !del)
  99         usage();
 100
 101     if (add) {
 102         char *buf[1024];
 103         char PidFile[256];
 104
 105         buf[0] = "execerror";
 106         buf[1] = "cfgexport";
 107         get_syms(&conf, syms);
 108
 109         cload.path = file;
 110         if (sysconfig(SYS_KLOAD, &cload, sizeof(cload)) == -1) {
 111             loadquery(L_GETMESSAGES, &buf[2], sizeof buf - 8);
 112             execvp("/etc/execerror", buf);
 113             perror("SYS_KLOAD");
 114             exit(1);
 115         }
 116
 117         cmod.kmid = cload.kmid;
 118         cmod.cmd = CFG_INIT;
 119         cmod.mdiptr = (caddr_t) & conf;
 120         cmod.mdilen = sizeof(conf);
 121
 122         if (sysconfig(SYS_CFGKMOD, &cmod, sizeof(cmod)) == -1) {
 123             perror("SYS_CFGKMOD");
 124             cload.kmid = cload.kmid;
 125             sysconfig(SYS_KULOAD, &cload, sizeof(cload));
 126             exit(1);
 127         }
 128 #ifdef  notdef
 129         printf("cfgexport -d 0x%x # to remove EXPORT\n", cload.kmid);
 130 #endif
 131         strcpy(PidFile, file);
 132         strcat(PidFile, ".kmid");
 133         fp = fopen(PidFile, "w");
 134         if (fp) {
 135             (void)fprintf(fp, "%d\n", cload.kmid);
 136             (void)fclose(fp);
 137         } else {
 138             printf("Can't open for write file %s (error=%d); ignored\n",
 139                    PidFile, errno);
 140         }
 141         exit(0);
 142     } else if (del) {
 143         char PidFile[256];
 144
 145         strcpy(PidFile, file);
 146         strcat(PidFile, ".kmid");
 147         fp = fopen(PidFile, "r");
 148         if (!fp) {
 149             printf("Can't read %s file (error=%d); aborting\n", PidFile,
 150                    errno);
 151             exit(1);
 152         }
 153         (void)fscanf(fp, "%d\n", &kmid);
 154         (void)fclose(fp);
 155         unlink(PidFile);
 156         cmod.kmid = kmid;
 157         cmod.cmd = CFG_TERM;
 158         cmod.mdiptr = NULL;
 159         cmod.mdilen = 0;
 160
 161         if (sysconfig(SYS_CFGKMOD, &cmod, sizeof(cmod)) == -1) {
 162             perror("SYS_CFGKMOD");
 163             exit(1);
 164         }
 165
 166         cload.kmid = kmid;
 167         if (sysconfig(SYS_KULOAD, &cload, sizeof(cload)) == -1) {
 168             perror("SYS_KULOAD");
 169             exit(1);
 170         }
 171         exit(0);
 172     }
 173 }
 174
 175 usage()
 176 {
 177
 178     error("usage: cfgexport [-a mod_file [-s symbols]] [-d mod_file]\n");
 179 }
 180
 181 /*
 182  * get_syms -   get kernel symbol table info.
 183  *
 184  * Input:
 185  *      conf    -       ^ to EXPORT extension configuration struct
 186  *      syms    -       ^ to name of file containing XCOFF symbols
 187  */
 188 get_syms(conf, syms)
 189      struct k_conf *conf;
 190      char *syms;
 191 {
 192     sym_t *k_symtab, *ksp;
 193     struct syment *x_symtab, *xsp, *xsq;
 194     char *kstrings;
 195     struct xcoffhdr hdr;        /* XCOFF header from symbol file */
 196     sym_t k_sym;                /* export version of symbol     */
 197     struct syment xcoff_sym;    /* xcoff version of symbol      */
 198     int i, nsyms, nksyms, nxsyms = 0;
 199     int xstr_size, kstr_size;
 200     FILE *fp;
 201     int xsym_compar();
 202
 203     if (syms == NULL)
 204       sys_error("syms is NULL");
 205     fp = fopen(syms, "r");
 206     if (fp == NULL)
 207         sys_error(syms);
 208
 209     if (fread(&hdr, sizeof(hdr), 1, fp) != 1)
 210         sys_error(syms);
 211
 212     if (hdr.filehdr.f_nsyms == 0)
 213         error("%s: no symbols", syms);
 214
 215     switch (hdr.filehdr.f_magic) {
 216     case U802WRMAGIC:
 217     case U802ROMAGIC:
 218     case U802TOCMAGIC:
 219     case U800WRMAGIC:
 220     case U800ROMAGIC:
 221     case U800TOCMAGIC:
 222 #ifdef __XCOFF64__
 223     case U64_TOCMAGIC:
 224 #endif
 225         break;
 226
 227     default:
 228         error("%s: funny magic number 0%o", syms, hdr.filehdr.f_magic);
 229     }
 230
 231     nsyms = hdr.filehdr.f_nsyms;
 232     if (debug)
 233         printf("nsyms = %d\n", nsyms);
 234
 235     x_symtab = malloc(nsyms * SYMESZ);
 236     if (!x_symtab)
 237         error("no memory for symbol table");
 238
 239     /*
 240      * try to snarf the string table: should be just past the
 241      * symbol table: first 4 bytes is length of rest.
 242      */
 243     if (fseek(fp, hdr.filehdr.f_symptr + nsyms * SYMESZ, 0) < 0)
 244         sys_error("%s: seek to strtab", syms);
 245
 246     if (fread(&xstr_size, sizeof(xstr_size), 1, fp) != 1)
 247         error("%s: reading string table size", syms);
 248
 249     xstrings = malloc(xstr_size + sizeof(xstr_size));
 250     if (!xstrings)
 251         error("no memory for string table");
 252
 253     /*
 254      * seek back to the start of the strings
 255      */
 256     if (fseek(fp, hdr.filehdr.f_symptr + nsyms * SYMESZ, 0) < 0)
 257         sys_error("%s: seek to strtab", syms);
 258
 259     if (fread(xstrings, sizeof(*xstrings), xstr_size, fp) != xstr_size)
 260         error("%s: reading string table");
 261
 262     /*
 263      * now seek back to the start of the symbol table, and read it
 264      * all in.
 265      */
 266     if (fseek(fp, hdr.filehdr.f_symptr, 0) < 0)
 267         sys_error("%s: seek to symtab", syms);
 268
 269     xsp = &x_symtab[0];
 270
 271     for (i = nxsyms = 0; i < nsyms; ++i) {
 272         char name[16], *p;
 273
 274         if (fread(&xcoff_sym, SYMESZ, 1, fp) != 1)
 275             error("%s: reading symbol entry", syms);
 276
 277 #ifdef __XCOFF64__
 278         p = xstrings + xcoff_sym.n_offset;
 279 #else
 280         if (xcoff_sym.n_zeroes == 0) {
 281             /*
 282              * Need to relocate string table offset
 283              */
 284             p = xcoff_sym.n_nptr = xstrings + xcoff_sym.n_offset;
 285         } else {
 286             strncpy(name, xcoff_sym.n_name, 8);
 287
 288             p = name, p[8] = 0;
 289         }
 290 #endif
 291
 292         if (debug > 2)
 293             dump_xsym(&xcoff_sym);
 294
 295         switch (xcoff_sym.n_sclass) {
 296         case C_EXT:             /* external                     */
 297         case C_HIDEXT:          /* hidden external (sic)        */
 298             /*
 299              * filtre out the ones with the strange names
 300              */
 301             if (strchr(p, '@') || strchr(p, '$') || p[0] == 0)
 302                 break;
 303
 304             *xsp++ = xcoff_sym;
 305             ++nxsyms;
 306
 307             if (debug > 1)
 308                 dump_xsym(&xcoff_sym);
 309
 310             break;
 311         }
 312
 313         if (xcoff_sym.n_numaux) {
 314             fseek(fp, xcoff_sym.n_numaux * AUXESZ, 1);
 315             i += xcoff_sym.n_numaux;
 316         }
 317     }
 318
 319     fclose(fp);
 320
 321     /*
 322      * sort the symbol table
 323      */
 324     qsort((char *)x_symtab, nxsyms, sizeof(*x_symtab), xsym_compar);
 325
 326     /*
 327      * we will need no more than `nxsyms' symbols.
 328      */
 329     k_symtab = malloc(nxsyms * sizeof(sym_t));
 330     if (!k_symtab)
 331         error("no memory for EXPORT symbol table");
 332
 333     /*
 334      * uniquify it, and xlate to funny EXPORT format
 335      */
 336     xsp = xsq = x_symtab;
 337     ksp = k_symtab;
 338     kstrings = 0;
 339     kstr_size = 0;
 340     nksyms = 0;
 341
 342     memset(xsq = &xcoff_sym, 0, sizeof(*xsq));
 343
 344     for (i = 1; i < nxsyms; ++i, xsq = xsp++) {
 345 #ifdef __XCOFF64__
 346         if (xsp->n_offset != xsq->n_offset || xsp->n_value != xsq->n_value) {
 347 #else
 348         if (xsp->n_zeroes != xsq->n_zeroes || xsp->n_offset != xsq->n_offset
 349             || xsp->n_value != xsq->n_value) {
 350 #endif
 351             xlate_xtok(xsp, ksp++, &kstrings, &kstr_size);
 352             ++nksyms;
 353         }
 354     }
 355
 356     /*
 357      * place the symbol table info into the `conf' data structure
 358      *
 359      * XXXXX: for today only, leave the string table the same.
 360      */
 361     conf->nsyms = nksyms;
 362     conf->symt_sz = nksyms * sizeof(sym_t);
 363     conf->str_sz = kstr_size;
 364     conf->symtab = (caddr_t) k_symtab;
 365     conf->strtab = kstrings;
 366 }
 367
 368
 369 /*
 370  * xlate_xtok   -       xlate XCOFF to EXPORT format
 371  *
 372  * Input:
 373  *      xp      -       ^ to XCOFF symbol
 374  *      kp      -       ^ to EXPORT  symbol save area
 375  *      strp    -       ^ to ^ to EXPORT string table
 376  *      szp     -       ^ to EXPORT string table size
 377  */
 378 #define SYMBUFSIZE 1048576
 379 xlate_xtok(xp, kp, strp, szp)
 380      struct syment *xp;
 381      sym_t *kp;
 382      char **strp;
 383      uint *szp;
 384 {
 385     int len;
 386     static char *export_strings = NULL, *prev = "";
 387     static left, offset, sz;
 388
 389     if (!export_strings) {
 390         export_strings = malloc(sz = SYMBUFSIZE);
 391         if (!export_strings)
 392             error("no memory for EXPORT string table");
 393
 394         *strp = export_strings;
 395         *szp = offset = sizeof(uint);
 396         left = SYMBUFSIZE - offset;
 397
 398         export_strings += offset;
 399
 400         *(uint *) export_strings = 0;   /* initial 4 bytes      */
 401     }
 402 #ifdef __XCOFF64__
 403     if (strcmp(prev, xstrings + xp->n_offset) == 0) {
 404         /*
 405          * same name as previous entry: just use previous
 406          */
 407         kp->n_offset = offset - strlen(*strp + xp->n_offset) - 1;
 408     } else
 409         if (find_suffix
 410             (xstrings + xp->n_offset, *strp, offset, &kp->n_offset)) {
 411         /*
 412          * found a string that we are a suffix of
 413          */
 414         ;
 415     } else {
 416         /*
 417          * need to add to our string table
 418          */
 419         len = strlen(xstrings + xp->n_offset) + 1;
 420         while (len >= left) {
 421             fprintf(stderr, "cfgexport: Out of memory. Increase SYMBUFSIZE and recompile\n");
 422             exit(1);
 423 #if 0
 424             /* Something is broken with this code, after being here
 425                cfgexport segfaults */
 426             export_strings = (char *)realloc(*strp, sz += SYMBUFSIZE);
 427             if (!export_strings)
 428                 error("no memory for EXPORT string table");
 429             *strp = export_strings;
 430             left += SYMBUFSIZE;
 431             prev = "";          /* lazy */
 432 #endif
 433         }
 434
 435         strcpy(prev = *strp + offset, xstrings + xp->n_offset);
 436
 437         kp->n_offset = offset;
 438         offset += len;
 439         left -= len;
 440         *szp += len;
 441     }
 442 #else
 443     if (kp->n_zeroes = xp->n_zeroes) {  /* sic  */
 444         kp->n_zeroes = xp->n_zeroes;
 445         kp->n_offset = xp->n_offset;
 446     } else if (strcmp(prev, xp->n_nptr) == 0) {
 447         /*
 448          * same name as previous entry: just use previous
 449          */
 450         kp->n_offset = offset - strlen(xp->n_nptr) - 1;
 451     } else if (find_suffix(xp->n_nptr, *strp, offset, &kp->n_offset)) {
 452         /*
 453          * found a string that we are a suffix of
 454          */
 455         ;
 456     } else {
 457         /*
 458          * need to add to our string table
 459          */
 460         len = strlen(xp->n_nptr) + 1;
 461         while (len >= left) {
 462             export_strings = realloc(*strp, sz += SYMBUFSIZE);
 463             if (!export_strings)
 464                 error("no memory for EXPORT string table");
 465             *strp = export_strings;
 466             left += SYMBUFSIZE;
 467             prev = "";          /* lazy */
 468         }
 469
 470         strcpy(prev = *strp + offset, xp->n_nptr);
 471
 472         kp->n_offset = offset;
 473         offset += len;
 474         left -= len;
 475         *szp += len;
 476     }
 477 #endif
 478
 479     kp->n_value = xp->n_value;
 480
 481     if (debug)
 482         dump_ksym(kp, *strp);
 483 }
 484
 485 /*
 486  * find_suffix  -       look for a string that arg string is suffix of
 487  *
 488  * Input:
 489  *      p       -       ^ to string we hope is a suffix of another
 490  *      strings -       ^ to string table
 491  *      max     -       max offset of valid string in strings
 492  *      offp    -       ^ to place to store offset, if containing string found
 493  *
 494  * Returns:
 495  *       0      -       no containing string found
 496  *      !0      -       string found of which `p' is a suffix
 497  *
 498  * NOTE:
 499  *      This is rather inefficient.
 500  */
 501 find_suffix(p, strings, max, offp)
 502      char *p, *strings;
 503      uint *offp;
 504 {
 505     char *q, *e;
 506     int len = strlen(p) - 1;
 507
 508     strings += sizeof(uint);
 509     max -= sizeof(uint);
 510
 511     for (e = strings + max; e > strings;) {
 512         /*
 513          * adjust `e' to point at last non-blank
 514          */
 515         if (*e == 0) {
 516             --e;
 517             continue;
 518         }
 519
 520         for (q = p + len; q > p && *q == *e;)
 521             --q, --e;
 522
 523         if (*q == *e) {
 524             if (debug)
 525                 printf("found_suffix: %s\n", p);
 526             return *offp = e - strings + sizeof(uint);
 527         }
 528
 529         if (*e)
 530             while (*e && e > strings)
 531                 --e;
 532     }
 533
 534     return 0;
 535 }
 536
 537 /*
 538  * xsym_compar -        compare two XCOFF symbol table entries
 539  *
 540  * If the names are the same, sort by descending storage class, so that
 541  * C_EXT < C_HIDEXT;
 542  */
 543 xsym_compar(xp, xq)
 544      struct syment *xp, *xq;
 545 {
 546     char *p, *q;
 547     int compar;
 548
 549 #ifndef __XCOFF64__
 550     p = (xp->n_zeroes ? xp->n_name : xp->n_nptr);
 551     q = (xq->n_zeroes ? xq->n_name : xq->n_nptr);
 552
 553     if (xp->n_zeroes || xq->n_zeroes)
 554         compar = strncmp(p, q, 8);
 555     else
 556 #else
 557     p = xstrings + xp->n_offset;
 558     q = xstrings + xq->n_offset;
 559 #endif
 560     compar = strcmp(p, q);
 561
 562     if (compar == 0)
 563         compar = xp->n_sclass - xq->n_sclass;
 564
 565     return compar;
 566 }
 567
 568 /*
 569  * dump_xsym -  print to XCOFF symbol
 570  */
 571 dump_xsym(xsp)
 572      struct syment *xsp;
 573 {
 574
 575 #ifndef __XCOFF64__
 576     if (xsp->n_zeroes)
 577         printf
 578             ("nptr <%-8.8s  %8.8s> val %8.8x sc# %4.4x type %4.4x sclass %2.2x naux %2.2x\n",
 579              xsp->n_name, "", xsp->n_value, xsp->n_scnum & 0xffff,
 580              xsp->n_type, xsp->n_sclass, xsp->n_numaux);
 581     else
 582 #endif
 583         printf
 584             ("nptr <%-17.17s> val %8.8x sc# %4.4x type %4.4x sclass %2.2x naux %2.2x\n"
 585 #ifdef __XCOFF64__
 586              , xstrings + xsp->n_offset
 587 #else
 588              , xsp->n_nptr
 589 #endif
 590              , xsp->n_value, xsp->n_scnum & 0xffff, xsp->n_type,
 591              xsp->n_sclass, xsp->n_numaux);
 592 }
 593
 594 dump_ksym(ksp, strings)
 595      sym_t *ksp;
 596      char *strings;
 597 {
 598
 599 #ifndef __XCOFF64__
 600     if (ksp->n_zeroes)
 601         printf("%8.8x %-8.8s\n", ksp->n_value, ksp->n_name);
 602     else
 603 #endif
 604         printf("%8.8x %s\n", ksp->n_value, ksp->n_offset + strings);
 605 }
 606
 607 error(p, a, b, c, d, e)
 608      char *p;
 609 {
 610
 611     fprintf(stderr, p, a, b, c, d, e);
 612     fprintf(stderr, "\n");
 613     exit(1);
 614 }
 615
 616 sys_error(p, a, b, c, d, e)
 617      char *p;
 618 {
 619
 620     fprintf(stderr, p, a, b, c, d, e);
 621     perror(": ");
 622     exit(1);
 623 }
 624
 625 warn(p, a, b, c, d, e)
 626      char *p;
 627 {
 628
 629     fprintf(stderr, p, a, b, c, d, e);
 630     fprintf(stderr, "\n");
 631 }