sbin/camcontrol/modeedit.c

   1 /*-
   2  * Copyright (c) 2000 Kelly Yancey <kbyanc@posi.net>
   3  * Derived from work done by Julian Elischer <julian@tfs.com,
   4  * julian@dialix.oz.au>, 1993, and Peter Dufault <dufault@hda.com>, 1994.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer,
  12  *    without modification, immediately at the beginning of the file.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  *
  28  * $FreeBSD: src/sbin/camcontrol/modeedit.c,v 1.5.2.2 2003/01/08 17:55:02 njl Exp $
  29  * $DragonFly: src/sbin/camcontrol/modeedit.c,v 1.3 2005/01/11 23:58:55 cpressey Exp $
  30  */
  31
  32 #include <sys/queue.h>
  33 #include <sys/types.h>
  34
  35 #include <assert.h>
  36 #include <ctype.h>
  37 #include <err.h>
  38 #include <errno.h>
  39 #include <stdlib.h>
  40 #include <string.h>
  41 #include <stdio.h>
  42 #include <sysexits.h>
  43 #include <unistd.h>
  44
  45 #include <cam/scsi/scsi_all.h>
  46 #include <cam/cam.h>
  47 #include <cam/cam_ccb.h>
  48 #include <camlib.h>
  49 #include "camcontrol.h"
  50
  51 int verbose = 0;
  52
  53 #define DEFAULT_SCSI_MODE_DB    "/usr/share/misc/scsi_modes"
  54 #define DEFAULT_EDITOR          "vi"
  55 #define MAX_FORMAT_SPEC         4096    /* Max CDB format specifier. */
  56 #define MAX_PAGENUM_LEN         10      /* Max characters in page num. */
  57 #define MAX_PAGENAME_LEN        64      /* Max characters in page name. */
  58 #define PAGEDEF_START           '{'     /* Page definition delimiter. */
  59 #define PAGEDEF_END             '}'     /* Page definition delimiter. */
  60 #define PAGENAME_START          '"'     /* Page name delimiter. */
  61 #define PAGENAME_END            '"'     /* Page name delimiter. */
  62 #define PAGEENTRY_END           ';'     /* Page entry terminator (optional). */
  63 #define MAX_COMMAND_SIZE        255     /* Mode/Log sense data buffer size. */
  64 #define PAGE_CTRL_SHIFT         6       /* Bit offset to page control field. */
  65
  66
  67 /* Macros for working with mode pages. */
  68 #define MODE_PAGE_HEADER(mh)                                            \
  69         (struct scsi_mode_page_header *)find_mode_page_6(mh)
  70
  71 #define MODE_PAGE_DATA(mph)                                             \
  72         (u_int8_t *)(mph) + sizeof(struct scsi_mode_page_header)
  73
  74
  75 struct editentry {
  76         STAILQ_ENTRY(editentry) link;
  77         char    *name;
  78         char    type;
  79         int     editable;
  80         int     size;
  81         union {
  82                 int     ivalue;
  83                 char    *svalue;
  84         } value;
  85 };
  86 STAILQ_HEAD(, editentry) editlist;      /* List of page entries. */
  87 int editlist_changed = 0;               /* Whether any entries were changed. */
  88
  89 struct pagename {
  90         SLIST_ENTRY(pagename) link;
  91         int pagenum;
  92         char *name;
  93 };
  94 SLIST_HEAD(, pagename) namelist;        /* Page number to name mappings. */
  95
  96 static char format[MAX_FORMAT_SPEC];    /* Buffer for scsi cdb format def. */
  97
  98 static FILE *edit_file = NULL;          /* File handle for edit file. */
  99 static char edit_path[] = "/tmp/camXXXXXX";
 100
 101
 102 /* Function prototypes. */
 103 static void              editentry_create(void *, int, void *, int, char *);
 104 static void              editentry_update(void *, int, void *, int, char *);
 105 static int               editentry_save(void *, char *);
 106 static struct editentry *editentry_lookup(char *);
 107 static int               editentry_set(char *, char *, int);
 108 static void              editlist_populate(struct cam_device *, int, int, int,
 109                                            int, int);
 110 static void              editlist_save(struct cam_device *, int, int, int, int,
 111                                        int);
 112 static void              nameentry_create(int, char *);
 113 static struct pagename  *nameentry_lookup(int);
 114 static int               load_format(const char *, int);
 115 static int               modepage_write(FILE *, int);
 116 static int               modepage_read(FILE *);
 117 static void              modepage_edit(void);
 118 static void              modepage_dump(struct cam_device *, int, int, int, int,
 119                                        int);
 120 static void              cleanup_editfile(void);
 121
 122
 123 #define returnerr(code) do {                                            \
 124         errno = code;                                                   \
 125         return (-1);                                                    \
 126 } while (0)
 127
 128
 129 #define RTRIM(string) do {                                              \
 130         int _length;                                            \
 131         while (isspace(string[_length = strlen(string) - 1]))           \
 132                 string[_length] = '\0';                                 \
 133 } while (0)
 134
 135
 136 static void
 137 editentry_create(void *hook __unused, int letter, void *arg, int count,
 138                  char *name)
 139 {
 140         struct editentry *newentry;     /* Buffer to hold new entry. */
 141
 142         /* Allocate memory for the new entry and a copy of the entry name. */
 143         if ((newentry = malloc(sizeof(struct editentry))) == NULL ||
 144             (newentry->name = strdup(name)) == NULL)
 145                 err(EX_OSERR, NULL);
 146
 147         /* Trim any trailing whitespace for the entry name. */
 148         RTRIM(newentry->name);
 149
 150         newentry->editable = (arg != NULL);
 151         newentry->type = letter;
 152         newentry->size = count;         /* Placeholder; not accurate. */
 153         newentry->value.svalue = NULL;
 154
 155         STAILQ_INSERT_TAIL(&editlist, newentry, link);
 156 }
 157
 158 static void
 159 editentry_update(void *hook __unused, int letter, void *arg, int count,
 160                  char *name)
 161 {
 162         struct editentry *dest;         /* Buffer to hold entry to update. */
 163
 164         dest = editentry_lookup(name);
 165         assert(dest != NULL);
 166
 167         dest->type = letter;
 168         dest->size = count;             /* We get the real size now. */
 169
 170         switch (dest->type) {
 171         case 'i':                       /* Byte-sized integral type. */
 172         case 'b':                       /* Bit-sized integral types. */
 173         case 't':
 174                 dest->value.ivalue = (intptr_t)arg;
 175                 break;
 176
 177         case 'c':                       /* Character array. */
 178         case 'z':                       /* Null-padded string. */
 179                 editentry_set(name, (char *)arg, 0);
 180                 break;
 181         default:
 182                 ; /* NOTREACHED */
 183         }
 184 }
 185
 186 static int
 187 editentry_save(void *hook __unused, char *name)
 188 {
 189         struct editentry *src;          /* Entry value to save. */
 190
 191         src = editentry_lookup(name);
 192         assert(src != NULL);
 193
 194         switch (src->type) {
 195         case 'i':                       /* Byte-sized integral type. */
 196         case 'b':                       /* Bit-sized integral types. */
 197         case 't':
 198                 return (src->value.ivalue);
 199                 /* NOTREACHED */
 200
 201         case 'c':                       /* Character array. */
 202         case 'z':                       /* Null-padded string. */
 203                 return ((intptr_t)src->value.svalue);
 204                 /* NOTREACHED */
 205
 206         default:
 207                 ; /* NOTREACHED */
 208         }
 209
 210         return (0);                     /* This should never happen. */
 211 }
 212
 213 static struct editentry *
 214 editentry_lookup(char *name)
 215 {
 216         struct editentry *scan;
 217
 218         assert(name != NULL);
 219
 220         STAILQ_FOREACH(scan, &editlist, link) {
 221                 if (strcasecmp(scan->name, name) == 0)
 222                         return (scan);
 223         }
 224
 225         /* Not found during list traversal. */
 226         return (NULL);
 227 }
 228
 229 static int
 230 editentry_set(char *name, char *newvalue, int editonly)
 231 {
 232         struct editentry *dest; /* Modepage entry to update. */
 233         char *cval;             /* Pointer to new string value. */
 234         char *convertend;       /* End-of-conversion pointer. */
 235         int ival;               /* New integral value. */
 236         int resolution;         /* Resolution in bits for integer conversion. */
 237         int resolution_max;     /* Maximum resolution for modepage's size. */
 238
 239         assert(newvalue != NULL);
 240         if (*newvalue == '\0')
 241                 return (0);     /* Nothing to do. */
 242
 243         if ((dest = editentry_lookup(name)) == NULL)
 244                 returnerr(ENOENT);
 245         if (!dest->editable && editonly)
 246                 returnerr(EPERM);
 247
 248         switch (dest->type) {
 249         case 'i':               /* Byte-sized integral type. */
 250         case 'b':               /* Bit-sized integral types. */
 251         case 't':
 252                 /* Convert the value string to an integer. */
 253                 resolution = (dest->type == 'i')? 8: 1;
 254                 ival = (int)strtol(newvalue, &convertend, 0);
 255                 if (*convertend != '\0')
 256                         returnerr(EINVAL);
 257
 258                 /*
 259                  * Determine the maximum value of the given size for the
 260                  * current resolution.
 261                  * XXX Lovely x86's optimize out the case of shifting by 32,
 262                  * and gcc doesn't currently workaround it (even for int64's),
 263                  * so we have to kludge it.
 264                  */
 265                 if (resolution * dest->size == 32)
 266                         resolution_max = 0xffffffff;
 267                 else
 268                         resolution_max = (1 << (resolution * dest->size)) - 1;
 269
 270                 if (ival > resolution_max || ival < 0) {
 271                         int newival = (ival < 0) ? 0 : resolution_max;
 272                         warnx("value %d is out of range for entry %s; clipping "
 273                             "to %d", ival, name, newival);
 274                         ival = newival;
 275                 }
 276                 if (dest->value.ivalue != ival)
 277                         editlist_changed = 1;
 278                 dest->value.ivalue = ival;
 279                 break;
 280
 281         case 'c':               /* Character array. */
 282         case 'z':               /* Null-padded string. */
 283                 if ((cval = malloc(dest->size + 1)) == NULL)
 284                         err(EX_OSERR, NULL);
 285                 bzero(cval, dest->size + 1);
 286                 strncpy(cval, newvalue, dest->size);
 287                 if (dest->type == 'z') {
 288                         /* Convert trailing spaces to nulls. */
 289                         char *conv_end;
 290
 291                         for (conv_end = cval + dest->size;
 292                             conv_end >= cval; conv_end--) {
 293                                 if (*conv_end == ' ')
 294                                         *conv_end = '\0';
 295                                 else if (*conv_end != '\0')
 296                                         break;
 297                         }
 298                 }
 299                 if (strncmp(dest->value.svalue, cval, dest->size) == 0) {
 300                         /* Nothing changed, free the newly allocated string. */
 301                         free(cval);
 302                         break;
 303                 }
 304                 if (dest->value.svalue != NULL) {
 305                         /* Free the current string buffer. */
 306                         free(dest->value.svalue);
 307                         dest->value.svalue = NULL;
 308                 }
 309                 dest->value.svalue = cval;
 310                 editlist_changed = 1;
 311                 break;
 312
 313         default:
 314                 ; /* NOTREACHED */
 315         }
 316
 317         return (0);
 318 }
 319
 320 static void
 321 nameentry_create(int pagenum, char *name) {
 322         struct pagename *newentry;
 323
 324         if (pagenum < 0 || name == NULL || name[0] == '\0')
 325                 return;
 326
 327         /* Allocate memory for the new entry and a copy of the entry name. */
 328         if ((newentry = malloc(sizeof(struct pagename))) == NULL ||
 329             (newentry->name = strdup(name)) == NULL)
 330                 err(EX_OSERR, NULL);
 331
 332         /* Trim any trailing whitespace for the page name. */
 333         RTRIM(newentry->name);
 334
 335         newentry->pagenum = pagenum;
 336         SLIST_INSERT_HEAD(&namelist, newentry, link);
 337 }
 338
 339 static struct pagename *
 340 nameentry_lookup(int pagenum) {
 341         struct pagename *scan;
 342
 343         SLIST_FOREACH(scan, &namelist, link) {
 344                 if (pagenum == scan->pagenum)
 345                         return (scan);
 346         }
 347
 348         /* Not found during list traversal. */
 349         return (NULL);
 350 }
 351
 352 static int
 353 load_format(const char *pagedb_path, int page)
 354 {
 355         FILE *pagedb;
 356         char str_pagenum[MAX_PAGENUM_LEN];
 357         char str_pagename[MAX_PAGENAME_LEN];
 358         int pagenum;
 359         int depth;                      /* Quoting depth. */
 360         int found;
 361         int lineno;
 362         enum { LOCATE, PAGENAME, PAGEDEF } state;
 363         char c;
 364
 365 #define SETSTATE_LOCATE do {                                            \
 366         str_pagenum[0] = '\0';                                          \
 367         str_pagename[0] = '\0';                                         \
 368         pagenum = -1;                                                   \
 369         state = LOCATE;                                                 \
 370 } while (0)
 371
 372 #define SETSTATE_PAGENAME do {                                          \
 373         str_pagename[0] = '\0';                                         \
 374         state = PAGENAME;                                               \
 375 } while (0)
 376
 377 #define SETSTATE_PAGEDEF do {                                           \
 378         format[0] = '\0';                                               \
 379         state = PAGEDEF;                                                \
 380 } while (0)
 381
 382 #define UPDATE_LINENO do {                                              \
 383         if (c == '\n')                                                  \
 384                 lineno++;                                               \
 385 } while (0)
 386
 387 #define BUFFERFULL(buffer)      (strlen(buffer) + 1 >= sizeof(buffer))
 388
 389         if ((pagedb = fopen(pagedb_path, "r")) == NULL)
 390                 returnerr(ENOENT);
 391
 392         SLIST_INIT(&namelist);
 393
 394         depth = 0;
 395         lineno = 0;
 396         found = 0;
 397         SETSTATE_LOCATE;
 398         while ((c = fgetc(pagedb)) != EOF) {
 399
 400                 /* Keep a line count to make error messages more useful. */
 401                 UPDATE_LINENO;
 402
 403                 /* Skip over comments anywhere in the mode database. */
 404                 if (c == '#') {
 405                         do {
 406                                 c = fgetc(pagedb);
 407                         } while (c != '\n' && c != EOF);
 408                         UPDATE_LINENO;
 409                         continue;
 410                 }
 411
 412                 /* Strip out newline characters. */
 413                 if (c == '\n')
 414                         continue;
 415
 416                 /* Keep track of the nesting depth for braces. */
 417                 if (c == PAGEDEF_START)
 418                         depth++;
 419                 else if (c == PAGEDEF_END) {
 420                         depth--;
 421                         if (depth < 0) {
 422                                 errx(EX_OSFILE, "%s:%d: %s", pagedb_path,
 423                                     lineno, "mismatched bracket");
 424                         }
 425                 }
 426
 427                 switch (state) {
 428                 case LOCATE:
 429                         /*
 430                          * Locate the page the user is interested in, skipping
 431                          * all others.
 432                          */
 433                         if (isspace(c)) {
 434                                 /* Ignore all whitespace between pages. */
 435                                 break;
 436                         } else if (depth == 0 && c == PAGEENTRY_END) {
 437                                 /*
 438                                  * A page entry terminator will reset page
 439                                  * scanning (useful for assigning names to
 440                                  * modes without providing a mode definition).
 441                                  */
 442                                 /* Record the name of this page. */
 443                                 pagenum = strtol(str_pagenum, NULL, 0);
 444                                 nameentry_create(pagenum, str_pagename);
 445                                 SETSTATE_LOCATE;
 446                         } else if (depth == 0 && c == PAGENAME_START) {
 447                                 SETSTATE_PAGENAME;
 448                         } else if (c == PAGEDEF_START) {
 449                                 pagenum = strtol(str_pagenum, NULL, 0);
 450                                 if (depth == 1) {
 451                                         /* Record the name of this page. */
 452                                         nameentry_create(pagenum, str_pagename);
 453                                         /*
 454                                          * Only record the format if this is
 455                                          * the page we are interested in.
 456                                          */
 457                                         if (page == pagenum && !found)
 458                                                 SETSTATE_PAGEDEF;
 459                                 }
 460                         } else if (c == PAGEDEF_END) {
 461                                 /* Reset the processor state. */
 462                                 SETSTATE_LOCATE;
 463                         } else if (depth == 0 && ! BUFFERFULL(str_pagenum)) {
 464                                 strncat(str_pagenum, &c, 1);
 465                         } else if (depth == 0) {
 466                                 errx(EX_OSFILE, "%s:%d: %s %d %s", pagedb_path,
 467                                     lineno, "page identifier exceeds",
 468                                     sizeof(str_pagenum) - 1, "characters");
 469                         }
 470                         break;
 471
 472                 case PAGENAME:
 473                         if (c == PAGENAME_END) {
 474                                 /*
 475                                  * Return to LOCATE state without resetting the
 476                                  * page number buffer.
 477                                  */
 478                                 state = LOCATE;
 479                         } else if (! BUFFERFULL(str_pagename)) {
 480                                 strncat(str_pagename, &c, 1);
 481                         } else {
 482                                 errx(EX_OSFILE, "%s:%d: %s %d %s", pagedb_path,
 483                                     lineno, "page name exceeds",
 484                                     sizeof(str_pagenum) - 1, "characters");
 485                         }
 486                         break;
 487
 488                 case PAGEDEF:
 489                         /*
 490                          * Transfer the page definition into a format buffer
 491                          * suitable for use with CDB encoding/decoding routines.
 492                          */
 493                         if (depth == 0) {
 494                                 found = 1;
 495                                 SETSTATE_LOCATE;
 496                         } else if (! BUFFERFULL(format)) {
 497                                 strncat(format, &c, 1);
 498                         } else {
 499                                 errx(EX_OSFILE, "%s:%d: %s %d %s", pagedb_path,
 500                                     lineno, "page definition exceeds",
 501                                     sizeof(format) - 1, "characters");
 502                         }
 503                         break;
 504
 505                 default:
 506                         ; /* NOTREACHED */
 507                 }
 508
 509                 /* Repeat processing loop with next character. */
 510         }
 511
 512         if (ferror(pagedb))
 513                 err(EX_OSFILE, "%s", pagedb_path);
 514
 515         /* Close the SCSI page database. */
 516         fclose(pagedb);
 517
 518         if (!found)                     /* Never found a matching page. */
 519                 returnerr(ESRCH);
 520
 521         return (0);
 522 }
 523
 524 static void
 525 editlist_populate(struct cam_device *device, int modepage, int page_control,
 526                   int dbd, int retries, int timeout)
 527 {
 528         u_int8_t data[MAX_COMMAND_SIZE];/* Buffer to hold sense data. */
 529         u_int8_t *mode_pars;            /* Pointer to modepage params. */
 530         struct scsi_mode_header_6 *mh;  /* Location of mode header. */
 531         struct scsi_mode_page_header *mph;
 532
 533         STAILQ_INIT(&editlist);
 534
 535         /* Fetch changeable values; use to build initial editlist. */
 536         mode_sense(device, modepage, 1, dbd, retries, timeout, data,
 537                    sizeof(data));
 538
 539         mh = (struct scsi_mode_header_6 *)data;
 540         mph = MODE_PAGE_HEADER(mh);
 541         mode_pars = MODE_PAGE_DATA(mph);
 542
 543         /* Decode the value data, creating edit_entries for each value. */
 544         buff_decode_visit(mode_pars, mh->data_length, format,
 545             editentry_create, 0);
 546
 547         /* Fetch the current/saved values; use to set editentry values. */
 548         mode_sense(device, modepage, page_control, dbd, retries, timeout, data,
 549                    sizeof(data));
 550         buff_decode_visit(mode_pars, mh->data_length, format,
 551             editentry_update, 0);
 552 }
 553
 554 static void
 555 editlist_save(struct cam_device *device, int modepage, int page_control,
 556               int dbd, int retries, int timeout)
 557 {
 558         u_int8_t data[MAX_COMMAND_SIZE];/* Buffer to hold sense data. */
 559         u_int8_t *mode_pars;            /* Pointer to modepage params. */
 560         struct scsi_mode_header_6 *mh;  /* Location of mode header. */
 561         struct scsi_mode_page_header *mph;
 562
 563         /* Make sure that something changed before continuing. */
 564         if (! editlist_changed)
 565                 return;
 566
 567         /*
 568          * Preload the CDB buffer with the current mode page data.
 569          * XXX If buff_encode_visit would return the number of bytes encoded
 570          *     we *should* use that to build a header from scratch. As it is
 571          *     now, we need mode_sense to find out the page length.
 572          */
 573         mode_sense(device, modepage, page_control, dbd, retries, timeout, data,
 574                    sizeof(data));
 575
 576         /* Initial headers & offsets. */
 577         mh = (struct scsi_mode_header_6 *)data;
 578         mph = MODE_PAGE_HEADER(mh);
 579         mode_pars = MODE_PAGE_DATA(mph);
 580
 581         /* Encode the value data to be passed back to the device. */
 582         buff_encode_visit(mode_pars, mh->data_length, format,
 583             editentry_save, 0);
 584
 585         /* Eliminate block descriptors. */
 586         bcopy(mph, ((u_int8_t *)mh) + sizeof(*mh),
 587             sizeof(*mph) + mph->page_length);
 588
 589         /* Recalculate headers & offsets. */
 590         mh->blk_desc_len = 0;           /* No block descriptors. */
 591         mh->dev_spec = 0;               /* Clear device-specific parameters. */
 592         mph = MODE_PAGE_HEADER(mh);
 593         mode_pars = MODE_PAGE_DATA(mph);
 594
 595         mph->page_code &= SMS_PAGE_CODE;/* Isolate just the page code. */
 596         mh->data_length = 0;            /* Reserved for MODE SELECT command. */
 597
 598         /*
 599          * Write the changes back to the device. If the user editted control
 600          * page 3 (saved values) then request the changes be permanently
 601          * recorded.
 602          */
 603         mode_select(device,
 604             (page_control << PAGE_CTRL_SHIFT == SMS_PAGE_CTRL_SAVED),
 605             retries, timeout, (u_int8_t *)mh,
 606             sizeof(*mh) + mh->blk_desc_len + sizeof(*mph) + mph->page_length);
 607 }
 608
 609 static int
 610 modepage_write(FILE *file, int editonly)
 611 {
 612         struct editentry *scan;
 613         int written = 0;
 614
 615         STAILQ_FOREACH(scan, &editlist, link) {
 616                 if (scan->editable || !editonly) {
 617                         written++;
 618                         if (scan->type == 'c' || scan->type == 'z') {
 619                                 fprintf(file, "%s:  %s\n", scan->name,
 620                                     scan->value.svalue);
 621                         } else {
 622                                 fprintf(file, "%s:  %d\n", scan->name,
 623                                     scan->value.ivalue);
 624                         }
 625                 }
 626         }
 627         return (written);
 628 }
 629
 630 static int
 631 modepage_read(FILE *file)
 632 {
 633         char *buffer;                   /* Pointer to dynamic line buffer.  */
 634         char *line;                     /* Pointer to static fgetln buffer. */
 635         char *name;                     /* Name portion of the line buffer. */
 636         char *value;                    /* Value portion of line buffer.    */
 637         size_t length;                  /* Length of static fgetln buffer.  */
 638
 639 #define ABORT_READ(message, param) do {                                 \
 640         warnx(message, param);                                          \
 641         free(buffer);                                                   \
 642         returnerr(EAGAIN);                                              \
 643 } while (0)
 644
 645         while ((line = fgetln(file, &length)) != NULL) {
 646                 /* Trim trailing whitespace (including optional newline). */
 647                 while (length > 0 && isspace(line[length - 1]))
 648                         length--;
 649
 650                 /* Allocate a buffer to hold the line + terminating null. */
 651                 if ((buffer = malloc(length + 1)) == NULL)
 652                         err(EX_OSERR, NULL);
 653                 memcpy(buffer, line, length);
 654                 buffer[length] = '\0';
 655
 656                 /* Strip out comments. */
 657                 if ((value = strchr(buffer, '#')) != NULL)
 658                         *value = '\0';
 659
 660                 /* The name is first in the buffer. Trim whitespace.*/
 661                 name = buffer;
 662                 RTRIM(name);
 663                 while (isspace(*name))
 664                         name++;
 665
 666                 /* Skip empty lines. */
 667                 if (strlen(name) == 0)
 668                         continue;
 669
 670                 /* The name ends at the colon; the value starts there. */
 671                 if ((value = strrchr(buffer, ':')) == NULL)
 672                         ABORT_READ("no value associated with %s", name);
 673                 *value = '\0';                  /* Null-terminate name. */
 674                 value++;                        /* Value starts afterwards. */
 675
 676                 /* Trim leading and trailing whitespace. */
 677                 RTRIM(value);
 678                 while (isspace(*value))
 679                         value++;
 680
 681                 /* Make sure there is a value left. */
 682                 if (strlen(value) == 0)
 683                         ABORT_READ("no value associated with %s", name);
 684
 685                 /* Update our in-memory copy of the modepage entry value. */
 686                 if (editentry_set(name, value, 1) != 0) {
 687                         if (errno == ENOENT) {
 688                                 /* No entry by the name. */
 689                                 ABORT_READ("no such modepage entry \"%s\"",
 690                                     name);
 691                         } else if (errno == EINVAL) {
 692                                 /* Invalid value. */
 693                                 ABORT_READ("Invalid value for entry \"%s\"",
 694                                     name);
 695                         } else if (errno == ERANGE) {
 696                                 /* Value out of range for entry type. */
 697                                 ABORT_READ("value out of range for %s", name);
 698                         } else if (errno == EPERM) {
 699                                 /* Entry is not editable; not fatal. */
 700                                 warnx("modepage entry \"%s\" is read-only; "
 701                                     "skipping.", name);
 702                         }
 703                 }
 704
 705                 free(buffer);
 706         }
 707         return (ferror(file)? -1: 0);
 708
 709 #undef ABORT_READ
 710 }
 711
 712 static void
 713 modepage_edit(void)
 714 {
 715         const char *editor;
 716         char *commandline;
 717         int fd;
 718         int written;
 719
 720         if (!isatty(fileno(stdin))) {
 721                 /* Not a tty, read changes from stdin. */
 722                 modepage_read(stdin);
 723                 return;
 724         }
 725
 726         /* Lookup editor to invoke. */
 727         if ((editor = getenv("EDITOR")) == NULL)
 728                 editor = DEFAULT_EDITOR;
 729
 730         /* Create temp file for editor to modify. */
 731         if ((fd = mkstemp(edit_path)) == -1)
 732                 errx(EX_CANTCREAT, "mkstemp failed");
 733
 734         atexit(cleanup_editfile);
 735
 736         if ((edit_file = fdopen(fd, "w")) == NULL)
 737                 err(EX_NOINPUT, "%s", edit_path);
 738
 739         written = modepage_write(edit_file, 1);
 740
 741         fclose(edit_file);
 742         edit_file = NULL;
 743
 744         if (written == 0) {
 745                 warnx("no editable entries");
 746                 cleanup_editfile();
 747                 return;
 748         }
 749
 750         /*
 751          * Allocate memory to hold the command line (the 2 extra characters
 752          * are to hold the argument separator (a space), and the terminating
 753          * null character.
 754          */
 755         commandline = malloc(strlen(editor) + strlen(edit_path) + 2);
 756         if (commandline == NULL)
 757                 err(EX_OSERR, NULL);
 758         sprintf(commandline, "%s %s", editor, edit_path);
 759
 760         /* Invoke the editor on the temp file. */
 761         if (system(commandline) == -1)
 762                 err(EX_UNAVAILABLE, "could not invoke %s", editor);
 763         free(commandline);
 764
 765         if ((edit_file = fopen(edit_path, "r")) == NULL)
 766                 err(EX_NOINPUT, "%s", edit_path);
 767
 768         /* Read any changes made to the temp file. */
 769         modepage_read(edit_file);
 770
 771         cleanup_editfile();
 772 }
 773
 774 static void
 775 modepage_dump(struct cam_device *device, int page, int page_control, int dbd,
 776               int retries, int timeout)
 777 {
 778         u_int8_t data[MAX_COMMAND_SIZE];/* Buffer to hold sense data. */
 779         u_int8_t *mode_pars;            /* Pointer to modepage params. */
 780         struct scsi_mode_header_6 *mh;  /* Location of mode header. */
 781         struct scsi_mode_page_header *mph;
 782         int mode_idx;                   /* Index for scanning mode params. */
 783
 784         mode_sense(device, page, page_control, dbd, retries, timeout, data,
 785                    sizeof(data));
 786
 787         mh = (struct scsi_mode_header_6 *)data;
 788         mph = MODE_PAGE_HEADER(mh);
 789         mode_pars = MODE_PAGE_DATA(mph);
 790
 791         /* Print the raw mode page data with newlines each 8 bytes. */
 792         for (mode_idx = 0; mode_idx < mph->page_length; mode_idx++) {
 793                 printf("%02x%c", mode_pars[mode_idx],
 794                     (((mode_idx + 1) % 8) == 0) ? '\n' : ' ');
 795         }
 796         putchar('\n');
 797 }
 798
 799 static void
 800 cleanup_editfile(void)
 801 {
 802         if (edit_file == NULL)
 803                 return;
 804         if (fclose(edit_file) != 0 || unlink(edit_path) != 0)
 805                 warn("%s", edit_path);
 806         edit_file = NULL;
 807 }
 808
 809 void
 810 mode_edit(struct cam_device *device, int page, int page_control, int dbd,
 811           int edit, int binary, int retry_count, int timeout)
 812 {
 813         const char *pagedb_path;        /* Path to modepage database. */
 814
 815         if (edit && binary)
 816                 errx(EX_USAGE, "cannot edit in binary mode.");
 817
 818         if (! binary) {
 819                 if ((pagedb_path = getenv("SCSI_MODES")) == NULL)
 820                         pagedb_path = DEFAULT_SCSI_MODE_DB;
 821
 822                 if (load_format(pagedb_path, page) != 0 && (edit || verbose)) {
 823                         if (errno == ENOENT) {
 824                                 /* Modepage database file not found. */
 825                                 warn("cannot open modepage database \"%s\"",
 826                                     pagedb_path);
 827                         } else if (errno == ESRCH) {
 828                                 /* Modepage entry not found in database. */
 829                                 warnx("modepage %d not found in database"
 830                                     "\"%s\"", page, pagedb_path);
 831                         }
 832                         /* We can recover in display mode, otherwise we exit. */
 833                         if (!edit) {
 834                                 warnx("reverting to binary display only");
 835                                 binary = 1;
 836                         } else
 837                                 exit(EX_OSFILE);
 838                 }
 839
 840                 editlist_populate(device, page, page_control, dbd, retry_count,
 841                         timeout);
 842         }
 843
 844         if (edit) {
 845                 if (page_control << PAGE_CTRL_SHIFT != SMS_PAGE_CTRL_CURRENT &&
 846                     page_control << PAGE_CTRL_SHIFT != SMS_PAGE_CTRL_SAVED)
 847                         errx(EX_USAGE, "it only makes sense to edit page 0 "
 848                             "(current) or page 3 (saved values)");
 849                 modepage_edit();
 850                 editlist_save(device, page, page_control, dbd, retry_count,
 851                         timeout);
 852         } else if (binary || STAILQ_EMPTY(&editlist)) {
 853                 /* Display without formatting information. */
 854                 modepage_dump(device, page, page_control, dbd, retry_count,
 855                     timeout);
 856         } else {
 857                 /* Display with format. */
 858                 modepage_write(stdout, 0);
 859         }
 860 }
 861
 862 void
 863 mode_list(struct cam_device *device, int page_control, int dbd,
 864           int retry_count, int timeout)
 865 {
 866         u_int8_t data[MAX_COMMAND_SIZE];/* Buffer to hold sense data. */
 867         u_int8_t *mode_pars;            /* Pointer to modepage params. */
 868         struct scsi_mode_header_6 *mh;  /* Location of mode header. */
 869         struct scsi_mode_page_header *mph;
 870         struct pagename *nameentry;
 871         const char *pagedb_path;
 872         int len;
 873
 874         if ((pagedb_path = getenv("SCSI_MODES")) == NULL)
 875                 pagedb_path = DEFAULT_SCSI_MODE_DB;
 876
 877         if (load_format(pagedb_path, 0) != 0 && verbose && errno == ENOENT) {
 878                 /* Modepage database file not found. */
 879                 warn("cannot open modepage database \"%s\"", pagedb_path);
 880         }
 881
 882         /* Build the list of all mode pages by querying the "all pages" page. */
 883         mode_sense(device, SMS_ALL_PAGES_PAGE, page_control, dbd, retry_count,
 884             timeout, data, sizeof(data));
 885
 886         mh = (struct scsi_mode_header_6 *)data;
 887         len = mh->blk_desc_len;         /* Skip block descriptors. */
 888         /* Iterate through the pages in the reply. */
 889         while (len < mh->data_length) {
 890                 /* Locate the next mode page header. */
 891                 mph = (struct scsi_mode_page_header *)
 892                     ((intptr_t)mh + sizeof(*mh) + len);
 893                 mode_pars = MODE_PAGE_DATA(mph);
 894
 895                 mph->page_code &= SMS_PAGE_CODE;
 896                 nameentry = nameentry_lookup(mph->page_code);
 897
 898                 if (nameentry == NULL || nameentry->name == NULL)
 899                         printf("0x%02x\n", mph->page_code);
 900                 else
 901                         printf("0x%02x\t%s\n", mph->page_code,
 902                             nameentry->name);
 903                 len += mph->page_length + sizeof(*mph);
 904         }
 905 }