1178431Sscf/*- 2178431Sscf * Copyright (c) 2008 Sean C. Farley <scf@FreeBSD.org> 3178431Sscf * All rights reserved. 4178431Sscf * 5178431Sscf * Redistribution and use in source and binary forms, with or without 6178431Sscf * modification, are permitted provided that the following conditions 7178431Sscf * are met: 8178431Sscf * 1. Redistributions of source code must retain the above copyright 9178431Sscf * notice, this list of conditions and the following disclaimer, 10178431Sscf * without modification, immediately at the beginning of the file. 11178431Sscf * 2. Redistributions in binary form must reproduce the above copyright 12178431Sscf * notice, this list of conditions and the following disclaimer in the 13178431Sscf * documentation and/or other materials provided with the distribution. 14178431Sscf * 15178431Sscf * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16178431Sscf * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17178431Sscf * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18178431Sscf * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19178431Sscf * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20178431Sscf * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21178431Sscf * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22178431Sscf * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23178431Sscf * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24178431Sscf * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25178431Sscf */ 26178431Sscf 27178431Sscf#include <sys/cdefs.h> 28178431Sscf__FBSDID("$FreeBSD$"); 29178431Sscf 30178431Sscf#include <sys/param.h> 31228545Sbapt#include <sys/errno.h> 32228545Sbapt#include <sys/stat.h> 33184831Sscf 34228545Sbapt#include <ctype.h> 35228545Sbapt#include <err.h> 36228545Sbapt#include <fcntl.h> 37178431Sscf#include <grp.h> 38178431Sscf#include <inttypes.h> 39184831Sscf#include <libutil.h> 40228545Sbapt#include <paths.h> 41178431Sscf#include <stdbool.h> 42178431Sscf#include <stdio.h> 43178431Sscf#include <stdlib.h> 44178431Sscf#include <string.h> 45228545Sbapt#include <unistd.h> 46178431Sscf 47228545Sbaptstatic int lockfd = -1; 48228545Sbaptstatic char group_dir[PATH_MAX]; 49228545Sbaptstatic char group_file[PATH_MAX]; 50228545Sbaptstatic char tempname[PATH_MAX]; 51228545Sbaptstatic int initialized; 52247919Sdbstatic size_t grmemlen(const struct group *, const char *, int *); 53248102Sdbstatic struct group *grcopy(const struct group *gr, char *mem, const char *, int ndx); 54228545Sbapt 55178431Sscf/* 56228545Sbapt * Initialize statics 57228545Sbapt */ 58228545Sbaptint 59228545Sbaptgr_init(const char *dir, const char *group) 60228545Sbapt{ 61242319Sbapt 62228545Sbapt if (dir == NULL) { 63228545Sbapt strcpy(group_dir, _PATH_ETC); 64228545Sbapt } else { 65228545Sbapt if (strlen(dir) >= sizeof(group_dir)) { 66228545Sbapt errno = ENAMETOOLONG; 67228545Sbapt return (-1); 68228545Sbapt } 69228545Sbapt strcpy(group_dir, dir); 70228545Sbapt } 71228545Sbapt 72228545Sbapt if (group == NULL) { 73228545Sbapt if (dir == NULL) { 74228545Sbapt strcpy(group_file, _PATH_GROUP); 75228545Sbapt } else if (snprintf(group_file, sizeof(group_file), "%s/group", 76228545Sbapt group_dir) > (int)sizeof(group_file)) { 77228545Sbapt errno = ENAMETOOLONG; 78228545Sbapt return (-1); 79228545Sbapt } 80228545Sbapt } else { 81228545Sbapt if (strlen(group) >= sizeof(group_file)) { 82228545Sbapt errno = ENAMETOOLONG; 83228545Sbapt return (-1); 84228545Sbapt } 85228545Sbapt strcpy(group_file, group); 86228545Sbapt } 87242319Sbapt 88228545Sbapt initialized = 1; 89228545Sbapt return (0); 90228545Sbapt} 91228545Sbapt 92228545Sbapt/* 93228545Sbapt * Lock the group file 94228545Sbapt */ 95228545Sbaptint 96228545Sbaptgr_lock(void) 97228545Sbapt{ 98228545Sbapt if (*group_file == '\0') 99228545Sbapt return (-1); 100228545Sbapt 101228545Sbapt for (;;) { 102228545Sbapt struct stat st; 103228545Sbapt 104244744Sbapt lockfd = flopen(group_file, O_RDONLY|O_NONBLOCK|O_CLOEXEC, 0); 105244735Sbapt if (lockfd == -1) { 106228545Sbapt if (errno == EWOULDBLOCK) { 107228545Sbapt errx(1, "the group file is busy"); 108228545Sbapt } else { 109228545Sbapt err(1, "could not lock the group file: "); 110228545Sbapt } 111228545Sbapt } 112228545Sbapt if (fstat(lockfd, &st) == -1) 113228545Sbapt err(1, "fstat() failed: "); 114228545Sbapt if (st.st_nlink != 0) 115228545Sbapt break; 116228545Sbapt close(lockfd); 117228545Sbapt lockfd = -1; 118228545Sbapt } 119228545Sbapt return (lockfd); 120228545Sbapt} 121228545Sbapt 122228545Sbapt/* 123228545Sbapt * Create and open a presmuably safe temp file for editing group data 124228545Sbapt */ 125228545Sbaptint 126228545Sbaptgr_tmp(int mfd) 127228545Sbapt{ 128228545Sbapt char buf[8192]; 129228545Sbapt ssize_t nr; 130228545Sbapt const char *p; 131228545Sbapt int tfd; 132228545Sbapt 133228545Sbapt if (*group_file == '\0') 134228545Sbapt return (-1); 135228545Sbapt if ((p = strrchr(group_file, '/'))) 136228545Sbapt ++p; 137228545Sbapt else 138228545Sbapt p = group_file; 139228545Sbapt if (snprintf(tempname, sizeof(tempname), "%.*sgroup.XXXXXX", 140228545Sbapt (int)(p - group_file), group_file) >= (int)sizeof(tempname)) { 141228545Sbapt errno = ENAMETOOLONG; 142228545Sbapt return (-1); 143228545Sbapt } 144228545Sbapt if ((tfd = mkstemp(tempname)) == -1) 145228545Sbapt return (-1); 146228545Sbapt if (mfd != -1) { 147228545Sbapt while ((nr = read(mfd, buf, sizeof(buf))) > 0) 148228545Sbapt if (write(tfd, buf, (size_t)nr) != nr) 149228545Sbapt break; 150228545Sbapt if (nr != 0) { 151228545Sbapt unlink(tempname); 152228545Sbapt *tempname = '\0'; 153228545Sbapt close(tfd); 154228545Sbapt return (-1); 155228545Sbapt } 156228545Sbapt } 157228545Sbapt return (tfd); 158228545Sbapt} 159228545Sbapt 160228545Sbapt/* 161228545Sbapt * Copy the group file from one descriptor to another, replacing, deleting 162228545Sbapt * or adding a single record on the way. 163228545Sbapt */ 164228545Sbaptint 165228545Sbaptgr_copy(int ffd, int tfd, const struct group *gr, struct group *old_gr) 166228545Sbapt{ 167228545Sbapt char buf[8192], *end, *line, *p, *q, *r, t; 168228545Sbapt struct group *fgr; 169228545Sbapt const struct group *sgr; 170228545Sbapt size_t len; 171228545Sbapt int eof, readlen; 172228545Sbapt 173228545Sbapt sgr = gr; 174228545Sbapt if (gr == NULL) { 175228545Sbapt line = NULL; 176228545Sbapt if (old_gr == NULL) 177228545Sbapt return (-1); 178228545Sbapt sgr = old_gr; 179228545Sbapt } else if ((line = gr_make(gr)) == NULL) 180228545Sbapt return (-1); 181228545Sbapt 182228545Sbapt eof = 0; 183228545Sbapt len = 0; 184228545Sbapt p = q = end = buf; 185228545Sbapt for (;;) { 186228545Sbapt /* find the end of the current line */ 187228545Sbapt for (p = q; q < end && *q != '\0'; ++q) 188228545Sbapt if (*q == '\n') 189228545Sbapt break; 190228545Sbapt 191228545Sbapt /* if we don't have a complete line, fill up the buffer */ 192228545Sbapt if (q >= end) { 193228545Sbapt if (eof) 194228545Sbapt break; 195228545Sbapt if ((size_t)(q - p) >= sizeof(buf)) { 196228545Sbapt warnx("group line too long"); 197228545Sbapt errno = EINVAL; /* hack */ 198228545Sbapt goto err; 199228545Sbapt } 200228545Sbapt if (p < end) { 201228545Sbapt q = memmove(buf, p, end -p); 202228545Sbapt end -= p - buf; 203228545Sbapt } else { 204228545Sbapt p = q = end = buf; 205228545Sbapt } 206228545Sbapt readlen = read(ffd, end, sizeof(buf) - (end -buf)); 207228545Sbapt if (readlen == -1) 208228545Sbapt goto err; 209228545Sbapt else 210228545Sbapt len = (size_t)readlen; 211228545Sbapt if (len == 0 && p == buf) 212228545Sbapt break; 213228545Sbapt end += len; 214228545Sbapt len = end - buf; 215228545Sbapt if (len < (ssize_t)sizeof(buf)) { 216228545Sbapt eof = 1; 217228545Sbapt if (len > 0 && buf[len -1] != '\n') 218228545Sbapt ++len, *end++ = '\n'; 219228545Sbapt } 220228545Sbapt continue; 221228545Sbapt } 222228545Sbapt 223228545Sbapt /* is it a blank line or a comment? */ 224228545Sbapt for (r = p; r < q && isspace(*r); ++r) 225228545Sbapt /* nothing */; 226228545Sbapt if (r == q || *r == '#') { 227228545Sbapt /* yep */ 228228545Sbapt if (write(tfd, p, q -p + 1) != q - p + 1) 229228545Sbapt goto err; 230228545Sbapt ++q; 231228545Sbapt continue; 232228545Sbapt } 233228545Sbapt 234228545Sbapt /* is it the one we're looking for? */ 235228545Sbapt 236228545Sbapt t = *q; 237228545Sbapt *q = '\0'; 238228545Sbapt 239228545Sbapt fgr = gr_scan(r); 240228545Sbapt 241228545Sbapt /* fgr is either a struct group for the current line, 242228545Sbapt * or NULL if the line is malformed. 243228545Sbapt */ 244228545Sbapt 245228545Sbapt *q = t; 246228545Sbapt if (fgr == NULL || fgr->gr_gid != sgr->gr_gid) { 247228545Sbapt /* nope */ 248228545Sbapt if (fgr != NULL) 249228545Sbapt free(fgr); 250228545Sbapt if (write(tfd, p, q - p + 1) != q - p + 1) 251228545Sbapt goto err; 252228545Sbapt ++q; 253228545Sbapt continue; 254228545Sbapt } 255228545Sbapt if (old_gr && !gr_equal(fgr, old_gr)) { 256228545Sbapt warnx("entry inconsistent"); 257228545Sbapt free(fgr); 258228545Sbapt errno = EINVAL; /* hack */ 259228545Sbapt goto err; 260228545Sbapt } 261228545Sbapt free(fgr); 262228545Sbapt 263228545Sbapt /* it is, replace or remove it */ 264228545Sbapt if (line != NULL) { 265228545Sbapt len = strlen(line); 266228545Sbapt if (write(tfd, line, len) != (int) len) 267228545Sbapt goto err; 268228545Sbapt } else { 269228545Sbapt /* when removed, avoid the \n */ 270228545Sbapt q++; 271228545Sbapt } 272228545Sbapt /* we're done, just copy the rest over */ 273228545Sbapt for (;;) { 274228545Sbapt if (write(tfd, q, end - q) != end - q) 275228545Sbapt goto err; 276228545Sbapt q = buf; 277228545Sbapt readlen = read(ffd, buf, sizeof(buf)); 278228545Sbapt if (readlen == 0) 279228545Sbapt break; 280228545Sbapt else 281228545Sbapt len = (size_t)readlen; 282228545Sbapt if (readlen == -1) 283228545Sbapt goto err; 284228545Sbapt end = buf + len; 285228545Sbapt } 286228545Sbapt goto done; 287228545Sbapt } 288228545Sbapt 289228545Sbapt /* if we got here, we didn't find the old entry */ 290228545Sbapt if (line == NULL) { 291228545Sbapt errno = ENOENT; 292228545Sbapt goto err; 293228545Sbapt } 294228545Sbapt len = strlen(line); 295228545Sbapt if ((size_t)write(tfd, line, len) != len || 296228545Sbapt write(tfd, "\n", 1) != 1) 297228545Sbapt goto err; 298228545Sbapt done: 299228545Sbapt if (line != NULL) 300228545Sbapt free(line); 301228545Sbapt return (0); 302228545Sbapt err: 303228545Sbapt if (line != NULL) 304228545Sbapt free(line); 305228545Sbapt return (-1); 306228545Sbapt} 307228545Sbapt 308228545Sbapt/* 309228545Sbapt * Regenerate the group file 310228545Sbapt */ 311228545Sbaptint 312228545Sbaptgr_mkdb(void) 313228545Sbapt{ 314243334Sbapt if (chmod(tempname, 0644) != 0) 315243334Sbapt return (-1); 316243328Sbapt 317243334Sbapt return (rename(tempname, group_file)); 318228545Sbapt} 319228545Sbapt 320228545Sbapt/* 321245390Smjg * Clean up. Preserves errno for the caller's convenience. 322228545Sbapt */ 323228545Sbaptvoid 324228545Sbaptgr_fini(void) 325228545Sbapt{ 326228545Sbapt int serrno; 327228545Sbapt 328228545Sbapt if (!initialized) 329228545Sbapt return; 330228545Sbapt initialized = 0; 331228545Sbapt serrno = errno; 332228545Sbapt if (*tempname != '\0') { 333228545Sbapt unlink(tempname); 334228545Sbapt *tempname = '\0'; 335228545Sbapt } 336228545Sbapt if (lockfd != -1) 337228545Sbapt close(lockfd); 338228545Sbapt errno = serrno; 339228545Sbapt} 340228545Sbapt 341228545Sbapt/* 342178431Sscf * Compares two struct group's. 343178431Sscf */ 344178431Sscfint 345178431Sscfgr_equal(const struct group *gr1, const struct group *gr2) 346178431Sscf{ 347185237Sscf int gr1_ndx; 348185237Sscf int gr2_ndx; 349178431Sscf 350178431Sscf /* Check that the non-member information is the same. */ 351185237Sscf if (gr1->gr_name == NULL || gr2->gr_name == NULL) { 352185237Sscf if (gr1->gr_name != gr2->gr_name) 353185237Sscf return (false); 354185237Sscf } else if (strcmp(gr1->gr_name, gr2->gr_name) != 0) 355185237Sscf return (false); 356185237Sscf if (gr1->gr_passwd == NULL || gr2->gr_passwd == NULL) { 357185237Sscf if (gr1->gr_passwd != gr2->gr_passwd) 358185237Sscf return (false); 359185237Sscf } else if (strcmp(gr1->gr_passwd, gr2->gr_passwd) != 0) 360185237Sscf return (false); 361185237Sscf if (gr1->gr_gid != gr2->gr_gid) 362185237Sscf return (false); 363178431Sscf 364248102Sdb /* Check all members in both groups. 365248102Sdb * getgrnam can return gr_mem with a pointer to NULL. 366248102Sdb * gr_dup and gr_add strip out this superfluous NULL, setting 367248102Sdb * gr_mem to NULL for no members. 368248102Sdb */ 369248102Sdb if (gr1->gr_mem != NULL && gr2->gr_mem != NULL) { 370248102Sdb int i; 371248102Sdb 372248102Sdb for (i = 0; gr1->gr_mem[i] != NULL; i++) { 373248102Sdb if (strcmp(gr1->gr_mem[i], gr2->gr_mem[i]) != 0) 374248102Sdb return (false); 375178431Sscf } 376178431Sscf } 377248102Sdb /* Count number of members in both structs */ 378248102Sdb gr2_ndx = 0; 379248102Sdb if (gr2->gr_mem != NULL) 380248102Sdb for(; gr2->gr_mem[gr2_ndx] != NULL; gr2_ndx++) 381248102Sdb /* empty */; 382248102Sdb gr1_ndx = 0; 383248102Sdb if (gr1->gr_mem != NULL) 384248102Sdb for(; gr1->gr_mem[gr1_ndx] != NULL; gr1_ndx++) 385248102Sdb /* empty */; 386248102Sdb if (gr1_ndx != gr2_ndx) 387248102Sdb return (false); 388178431Sscf 389185237Sscf return (true); 390178431Sscf} 391178431Sscf 392178431Sscf/* 393178431Sscf * Make a group line out of a struct group. 394178431Sscf */ 395178431Sscfchar * 396178431Sscfgr_make(const struct group *gr) 397178431Sscf{ 398245386Smjg const char *group_line_format = "%s:%s:%ju:"; 399245387Smjg const char *sep; 400178431Sscf char *line; 401245387Smjg char *p; 402185237Sscf size_t line_size; 403178431Sscf int ndx; 404178431Sscf 405178431Sscf /* Calculate the length of the group line. */ 406185237Sscf line_size = snprintf(NULL, 0, group_line_format, gr->gr_name, 407178431Sscf gr->gr_passwd, (uintmax_t)gr->gr_gid) + 1; 408185237Sscf if (gr->gr_mem != NULL) { 409185237Sscf for (ndx = 0; gr->gr_mem[ndx] != NULL; ndx++) 410185237Sscf line_size += strlen(gr->gr_mem[ndx]) + 1; 411185237Sscf if (ndx > 0) 412185237Sscf line_size--; 413185237Sscf } 414178431Sscf 415178431Sscf /* Create the group line and fill it. */ 416245387Smjg if ((line = p = malloc(line_size)) == NULL) 417178431Sscf return (NULL); 418245387Smjg p += sprintf(p, group_line_format, gr->gr_name, gr->gr_passwd, 419200423Sscf (uintmax_t)gr->gr_gid); 420245387Smjg if (gr->gr_mem != NULL) { 421245387Smjg sep = ""; 422185237Sscf for (ndx = 0; gr->gr_mem[ndx] != NULL; ndx++) { 423245387Smjg p = stpcpy(p, sep); 424245387Smjg p = stpcpy(p, gr->gr_mem[ndx]); 425245387Smjg sep = ","; 426185237Sscf } 427245387Smjg } 428178431Sscf 429178431Sscf return (line); 430178431Sscf} 431178431Sscf 432178431Sscf/* 433178431Sscf * Duplicate a struct group. 434178431Sscf */ 435178431Sscfstruct group * 436178431Sscfgr_dup(const struct group *gr) 437178431Sscf{ 438247919Sdb return (gr_add(gr, NULL)); 439247919Sdb} 440247919Sdb/* 441247919Sdb * Add a new member name to a struct group. 442247919Sdb */ 443247919Sdbstruct group * 444247919Sdbgr_add(const struct group *gr, const char *newmember) 445247919Sdb{ 446248102Sdb char *mem; 447184831Sscf size_t len; 448185237Sscf int num_mem; 449178431Sscf 450247919Sdb num_mem = 0; 451247919Sdb len = grmemlen(gr, newmember, &num_mem); 452178431Sscf /* Create new group and copy old group into it. */ 453248102Sdb if ((mem = malloc(len)) == NULL) 454178431Sscf return (NULL); 455248102Sdb return (grcopy(gr, mem, newmember, num_mem)); 456247919Sdb} 457247919Sdb 458247919Sdb/* It is safer to walk the pointers given at gr_mem since there is no 459248102Sdb * guarantee the gr_mem + strings are contiguous in the given struct group 460248102Sdb * but compactify the new group into the following form. 461247919Sdb * 462247919Sdb * The new struct is laid out like this in memory. The example given is 463247919Sdb * for a group with two members only. 464247919Sdb * 465247919Sdb * { 466247919Sdb * (char *name) 467247919Sdb * (char *passwd) 468247919Sdb * (int gid) 469247919Sdb * (gr_mem * newgrp + sizeof(struct group) + sizeof(**)) points to gr_mem area 470247919Sdb * gr_mem area 471247919Sdb * (member1 *) 472247919Sdb * (member2 *) 473247919Sdb * (NULL) 474247919Sdb * (name string) 475247919Sdb * (passwd string) 476247919Sdb * (member1 string) 477247919Sdb * (member2 string) 478247919Sdb * } 479247919Sdb */ 480247919Sdb/* 481248102Sdb * Copy the contents of a group plus given name to a preallocated group struct 482247919Sdb */ 483247919Sdbstatic struct group * 484248102Sdbgrcopy(const struct group *gr, char *dst, const char *name, int ndx) 485247919Sdb{ 486247919Sdb int i; 487248102Sdb struct group *newgr; 488247919Sdb 489248102Sdb newgr = (struct group *)(void *)dst; /* avoid alignment warning */ 490248102Sdb dst += sizeof(*newgr); 491248102Sdb if (ndx != 0) { 492248102Sdb newgr->gr_mem = (char **)(void *)(dst); /* avoid alignment warning */ 493248102Sdb dst += (ndx + 1) * sizeof(*newgr->gr_mem); 494248102Sdb } else 495244742Sbapt newgr->gr_mem = NULL; 496178431Sscf if (gr->gr_name != NULL) { 497244742Sbapt newgr->gr_name = dst; 498244742Sbapt dst = stpcpy(dst, gr->gr_name) + 1; 499247919Sdb } else 500244777Sbapt newgr->gr_name = NULL; 501178431Sscf if (gr->gr_passwd != NULL) { 502244742Sbapt newgr->gr_passwd = dst; 503244742Sbapt dst = stpcpy(dst, gr->gr_passwd) + 1; 504247919Sdb } else 505244777Sbapt newgr->gr_passwd = NULL; 506244742Sbapt newgr->gr_gid = gr->gr_gid; 507248102Sdb i = 0; 508248102Sdb /* Original group struct might have a NULL gr_mem */ 509248102Sdb if (gr->gr_mem != NULL) { 510248102Sdb for (; gr->gr_mem[i] != NULL; i++) { 511247919Sdb newgr->gr_mem[i] = dst; 512247919Sdb dst = stpcpy(dst, gr->gr_mem[i]) + 1; 513178431Sscf } 514248102Sdb } 515248102Sdb /* If name is not NULL, newgr->gr_mem is known to be not NULL */ 516248102Sdb if (name != NULL) { 517248102Sdb newgr->gr_mem[i++] = dst; 518248102Sdb dst = stpcpy(dst, name) + 1; 519248102Sdb } 520248102Sdb /* if newgr->gr_mem is not NULL add NULL marker */ 521248102Sdb if (newgr->gr_mem != NULL) 522247919Sdb newgr->gr_mem[i] = NULL; 523248102Sdb 524244742Sbapt return (newgr); 525178431Sscf} 526178431Sscf 527178431Sscf/* 528247919Sdb * Calculate length of a struct group + given name 529244736Sbapt */ 530247919Sdbstatic size_t 531247919Sdbgrmemlen(const struct group *gr, const char *name, int *num_mem) 532244736Sbapt{ 533247919Sdb size_t len; 534247919Sdb int i; 535244736Sbapt 536247919Sdb if (gr == NULL) 537247919Sdb return (0); 538247919Sdb /* Calculate size of the group. */ 539247919Sdb len = sizeof(*gr); 540247919Sdb if (gr->gr_name != NULL) 541247919Sdb len += strlen(gr->gr_name) + 1; 542247919Sdb if (gr->gr_passwd != NULL) 543247919Sdb len += strlen(gr->gr_passwd) + 1; 544248102Sdb i = 0; 545244736Sbapt if (gr->gr_mem != NULL) { 546248102Sdb for (; gr->gr_mem[i] != NULL; i++) { 547247919Sdb len += strlen(gr->gr_mem[i]) + 1; 548247919Sdb len += sizeof(*gr->gr_mem); 549244736Sbapt } 550244736Sbapt } 551247919Sdb if (name != NULL) { 552248102Sdb i++; 553247919Sdb len += strlen(name) + 1; 554248102Sdb len += sizeof(*gr->gr_mem); 555247919Sdb } 556248102Sdb /* Allow for NULL pointer */ 557248102Sdb if (i != 0) 558248102Sdb len += sizeof(*gr->gr_mem); 559248102Sdb *num_mem = i; 560247919Sdb return(len); 561244736Sbapt} 562244736Sbapt 563244736Sbapt/* 564178431Sscf * Scan a line and place it into a group structure. 565178431Sscf */ 566178431Sscfstatic bool 567178431Sscf__gr_scan(char *line, struct group *gr) 568178431Sscf{ 569178431Sscf char *loc; 570178431Sscf int ndx; 571178431Sscf 572178431Sscf /* Assign non-member information to structure. */ 573178431Sscf gr->gr_name = line; 574178431Sscf if ((loc = strchr(line, ':')) == NULL) 575178431Sscf return (false); 576178431Sscf *loc = '\0'; 577178431Sscf gr->gr_passwd = loc + 1; 578184831Sscf if (*gr->gr_passwd == ':') 579184831Sscf *gr->gr_passwd = '\0'; 580178431Sscf else { 581178431Sscf if ((loc = strchr(loc + 1, ':')) == NULL) 582178431Sscf return (false); 583178431Sscf *loc = '\0'; 584178431Sscf } 585184831Sscf if (sscanf(loc + 1, "%u", &gr->gr_gid) != 1) 586178431Sscf return (false); 587178431Sscf 588178431Sscf /* Assign member information to structure. */ 589178431Sscf if ((loc = strchr(loc + 1, ':')) == NULL) 590178431Sscf return (false); 591178431Sscf line = loc + 1; 592178431Sscf gr->gr_mem = NULL; 593185237Sscf ndx = 0; 594185237Sscf do { 595185237Sscf gr->gr_mem = reallocf(gr->gr_mem, sizeof(*gr->gr_mem) * 596185237Sscf (ndx + 1)); 597185237Sscf if (gr->gr_mem == NULL) 598185237Sscf return (false); 599185237Sscf 600185237Sscf /* Skip locations without members (i.e., empty string). */ 601178431Sscf do { 602178431Sscf gr->gr_mem[ndx] = strsep(&line, ","); 603185237Sscf } while (gr->gr_mem[ndx] != NULL && *gr->gr_mem[ndx] == '\0'); 604185237Sscf } while (gr->gr_mem[ndx++] != NULL); 605178431Sscf 606178431Sscf return (true); 607178431Sscf} 608178431Sscf 609178431Sscf/* 610178431Sscf * Create a struct group from a line. 611178431Sscf */ 612178431Sscfstruct group * 613178431Sscfgr_scan(const char *line) 614178431Sscf{ 615184831Sscf struct group gr; 616185237Sscf char *line_copy; 617185237Sscf struct group *new_gr; 618178431Sscf 619185237Sscf if ((line_copy = strdup(line)) == NULL) 620178431Sscf return (NULL); 621185237Sscf if (!__gr_scan(line_copy, &gr)) { 622185237Sscf free(line_copy); 623178431Sscf return (NULL); 624178431Sscf } 625185237Sscf new_gr = gr_dup(&gr); 626185237Sscf free(line_copy); 627178431Sscf if (gr.gr_mem != NULL) 628178431Sscf free(gr.gr_mem); 629178431Sscf 630185237Sscf return (new_gr); 631178431Sscf} 632