gr_util.c revision 273791
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: head/lib/libutil/gr_util.c 273791 2014-10-28 16:27:29Z bapt $"); 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 173273791Sbapt if (old_gr == NULL && gr == NULL) 174273791Sbapt return(-1); 175273791Sbapt 176273791Sbapt sgr = old_gr; 177273791Sbapt /* deleting a group */ 178228545Sbapt if (gr == NULL) { 179228545Sbapt line = NULL; 180273791Sbapt } else { 181273791Sbapt if ((line = gr_make(gr)) == NULL) 182228545Sbapt return (-1); 183273791Sbapt } 184228545Sbapt 185273791Sbapt /* adding a group */ 186273791Sbapt if (sgr == NULL) 187273791Sbapt sgr = gr; 188273791Sbapt 189228545Sbapt eof = 0; 190228545Sbapt len = 0; 191228545Sbapt p = q = end = buf; 192228545Sbapt for (;;) { 193228545Sbapt /* find the end of the current line */ 194228545Sbapt for (p = q; q < end && *q != '\0'; ++q) 195228545Sbapt if (*q == '\n') 196228545Sbapt break; 197228545Sbapt 198228545Sbapt /* if we don't have a complete line, fill up the buffer */ 199228545Sbapt if (q >= end) { 200228545Sbapt if (eof) 201228545Sbapt break; 202228545Sbapt if ((size_t)(q - p) >= sizeof(buf)) { 203228545Sbapt warnx("group line too long"); 204228545Sbapt errno = EINVAL; /* hack */ 205228545Sbapt goto err; 206228545Sbapt } 207228545Sbapt if (p < end) { 208228545Sbapt q = memmove(buf, p, end -p); 209228545Sbapt end -= p - buf; 210228545Sbapt } else { 211228545Sbapt p = q = end = buf; 212228545Sbapt } 213228545Sbapt readlen = read(ffd, end, sizeof(buf) - (end -buf)); 214228545Sbapt if (readlen == -1) 215228545Sbapt goto err; 216228545Sbapt else 217228545Sbapt len = (size_t)readlen; 218228545Sbapt if (len == 0 && p == buf) 219228545Sbapt break; 220228545Sbapt end += len; 221228545Sbapt len = end - buf; 222228545Sbapt if (len < (ssize_t)sizeof(buf)) { 223228545Sbapt eof = 1; 224228545Sbapt if (len > 0 && buf[len -1] != '\n') 225228545Sbapt ++len, *end++ = '\n'; 226228545Sbapt } 227228545Sbapt continue; 228228545Sbapt } 229228545Sbapt 230228545Sbapt /* is it a blank line or a comment? */ 231228545Sbapt for (r = p; r < q && isspace(*r); ++r) 232228545Sbapt /* nothing */; 233228545Sbapt if (r == q || *r == '#') { 234228545Sbapt /* yep */ 235228545Sbapt if (write(tfd, p, q -p + 1) != q - p + 1) 236228545Sbapt goto err; 237228545Sbapt ++q; 238228545Sbapt continue; 239228545Sbapt } 240228545Sbapt 241228545Sbapt /* is it the one we're looking for? */ 242228545Sbapt 243228545Sbapt t = *q; 244228545Sbapt *q = '\0'; 245228545Sbapt 246228545Sbapt fgr = gr_scan(r); 247228545Sbapt 248228545Sbapt /* fgr is either a struct group for the current line, 249228545Sbapt * or NULL if the line is malformed. 250228545Sbapt */ 251228545Sbapt 252228545Sbapt *q = t; 253228545Sbapt if (fgr == NULL || fgr->gr_gid != sgr->gr_gid) { 254228545Sbapt /* nope */ 255228545Sbapt if (fgr != NULL) 256228545Sbapt free(fgr); 257228545Sbapt if (write(tfd, p, q - p + 1) != q - p + 1) 258228545Sbapt goto err; 259228545Sbapt ++q; 260228545Sbapt continue; 261228545Sbapt } 262228545Sbapt if (old_gr && !gr_equal(fgr, old_gr)) { 263228545Sbapt warnx("entry inconsistent"); 264228545Sbapt free(fgr); 265228545Sbapt errno = EINVAL; /* hack */ 266228545Sbapt goto err; 267228545Sbapt } 268228545Sbapt free(fgr); 269228545Sbapt 270228545Sbapt /* it is, replace or remove it */ 271228545Sbapt if (line != NULL) { 272228545Sbapt len = strlen(line); 273228545Sbapt if (write(tfd, line, len) != (int) len) 274228545Sbapt goto err; 275228545Sbapt } else { 276228545Sbapt /* when removed, avoid the \n */ 277228545Sbapt q++; 278228545Sbapt } 279228545Sbapt /* we're done, just copy the rest over */ 280228545Sbapt for (;;) { 281228545Sbapt if (write(tfd, q, end - q) != end - q) 282228545Sbapt goto err; 283228545Sbapt q = buf; 284228545Sbapt readlen = read(ffd, buf, sizeof(buf)); 285228545Sbapt if (readlen == 0) 286228545Sbapt break; 287228545Sbapt else 288228545Sbapt len = (size_t)readlen; 289228545Sbapt if (readlen == -1) 290228545Sbapt goto err; 291228545Sbapt end = buf + len; 292228545Sbapt } 293228545Sbapt goto done; 294228545Sbapt } 295228545Sbapt 296228545Sbapt /* if we got here, we didn't find the old entry */ 297228545Sbapt if (line == NULL) { 298228545Sbapt errno = ENOENT; 299228545Sbapt goto err; 300228545Sbapt } 301228545Sbapt len = strlen(line); 302228545Sbapt if ((size_t)write(tfd, line, len) != len || 303228545Sbapt write(tfd, "\n", 1) != 1) 304228545Sbapt goto err; 305228545Sbapt done: 306228545Sbapt if (line != NULL) 307228545Sbapt free(line); 308228545Sbapt return (0); 309228545Sbapt err: 310228545Sbapt if (line != NULL) 311228545Sbapt free(line); 312228545Sbapt return (-1); 313228545Sbapt} 314228545Sbapt 315228545Sbapt/* 316228545Sbapt * Regenerate the group file 317228545Sbapt */ 318228545Sbaptint 319228545Sbaptgr_mkdb(void) 320228545Sbapt{ 321243334Sbapt if (chmod(tempname, 0644) != 0) 322243334Sbapt return (-1); 323243328Sbapt 324243334Sbapt return (rename(tempname, group_file)); 325228545Sbapt} 326228545Sbapt 327228545Sbapt/* 328245390Smjg * Clean up. Preserves errno for the caller's convenience. 329228545Sbapt */ 330228545Sbaptvoid 331228545Sbaptgr_fini(void) 332228545Sbapt{ 333228545Sbapt int serrno; 334228545Sbapt 335228545Sbapt if (!initialized) 336228545Sbapt return; 337228545Sbapt initialized = 0; 338228545Sbapt serrno = errno; 339228545Sbapt if (*tempname != '\0') { 340228545Sbapt unlink(tempname); 341228545Sbapt *tempname = '\0'; 342228545Sbapt } 343228545Sbapt if (lockfd != -1) 344228545Sbapt close(lockfd); 345228545Sbapt errno = serrno; 346228545Sbapt} 347228545Sbapt 348228545Sbapt/* 349178431Sscf * Compares two struct group's. 350178431Sscf */ 351178431Sscfint 352178431Sscfgr_equal(const struct group *gr1, const struct group *gr2) 353178431Sscf{ 354185237Sscf int gr1_ndx; 355185237Sscf int gr2_ndx; 356178431Sscf 357178431Sscf /* Check that the non-member information is the same. */ 358185237Sscf if (gr1->gr_name == NULL || gr2->gr_name == NULL) { 359185237Sscf if (gr1->gr_name != gr2->gr_name) 360185237Sscf return (false); 361185237Sscf } else if (strcmp(gr1->gr_name, gr2->gr_name) != 0) 362185237Sscf return (false); 363185237Sscf if (gr1->gr_passwd == NULL || gr2->gr_passwd == NULL) { 364185237Sscf if (gr1->gr_passwd != gr2->gr_passwd) 365185237Sscf return (false); 366185237Sscf } else if (strcmp(gr1->gr_passwd, gr2->gr_passwd) != 0) 367185237Sscf return (false); 368185237Sscf if (gr1->gr_gid != gr2->gr_gid) 369185237Sscf return (false); 370178431Sscf 371248102Sdb /* Check all members in both groups. 372248102Sdb * getgrnam can return gr_mem with a pointer to NULL. 373248102Sdb * gr_dup and gr_add strip out this superfluous NULL, setting 374248102Sdb * gr_mem to NULL for no members. 375248102Sdb */ 376248102Sdb if (gr1->gr_mem != NULL && gr2->gr_mem != NULL) { 377248102Sdb int i; 378248102Sdb 379248102Sdb for (i = 0; gr1->gr_mem[i] != NULL; i++) { 380248102Sdb if (strcmp(gr1->gr_mem[i], gr2->gr_mem[i]) != 0) 381248102Sdb return (false); 382178431Sscf } 383178431Sscf } 384248102Sdb /* Count number of members in both structs */ 385248102Sdb gr2_ndx = 0; 386248102Sdb if (gr2->gr_mem != NULL) 387248102Sdb for(; gr2->gr_mem[gr2_ndx] != NULL; gr2_ndx++) 388248102Sdb /* empty */; 389248102Sdb gr1_ndx = 0; 390248102Sdb if (gr1->gr_mem != NULL) 391248102Sdb for(; gr1->gr_mem[gr1_ndx] != NULL; gr1_ndx++) 392248102Sdb /* empty */; 393248102Sdb if (gr1_ndx != gr2_ndx) 394248102Sdb return (false); 395178431Sscf 396185237Sscf return (true); 397178431Sscf} 398178431Sscf 399178431Sscf/* 400178431Sscf * Make a group line out of a struct group. 401178431Sscf */ 402178431Sscfchar * 403178431Sscfgr_make(const struct group *gr) 404178431Sscf{ 405245386Smjg const char *group_line_format = "%s:%s:%ju:"; 406245387Smjg const char *sep; 407178431Sscf char *line; 408245387Smjg char *p; 409185237Sscf size_t line_size; 410178431Sscf int ndx; 411178431Sscf 412178431Sscf /* Calculate the length of the group line. */ 413185237Sscf line_size = snprintf(NULL, 0, group_line_format, gr->gr_name, 414178431Sscf gr->gr_passwd, (uintmax_t)gr->gr_gid) + 1; 415185237Sscf if (gr->gr_mem != NULL) { 416185237Sscf for (ndx = 0; gr->gr_mem[ndx] != NULL; ndx++) 417185237Sscf line_size += strlen(gr->gr_mem[ndx]) + 1; 418185237Sscf if (ndx > 0) 419185237Sscf line_size--; 420185237Sscf } 421178431Sscf 422178431Sscf /* Create the group line and fill it. */ 423245387Smjg if ((line = p = malloc(line_size)) == NULL) 424178431Sscf return (NULL); 425245387Smjg p += sprintf(p, group_line_format, gr->gr_name, gr->gr_passwd, 426200423Sscf (uintmax_t)gr->gr_gid); 427245387Smjg if (gr->gr_mem != NULL) { 428245387Smjg sep = ""; 429185237Sscf for (ndx = 0; gr->gr_mem[ndx] != NULL; ndx++) { 430245387Smjg p = stpcpy(p, sep); 431245387Smjg p = stpcpy(p, gr->gr_mem[ndx]); 432245387Smjg sep = ","; 433185237Sscf } 434245387Smjg } 435178431Sscf 436178431Sscf return (line); 437178431Sscf} 438178431Sscf 439178431Sscf/* 440178431Sscf * Duplicate a struct group. 441178431Sscf */ 442178431Sscfstruct group * 443178431Sscfgr_dup(const struct group *gr) 444178431Sscf{ 445247919Sdb return (gr_add(gr, NULL)); 446247919Sdb} 447247919Sdb/* 448247919Sdb * Add a new member name to a struct group. 449247919Sdb */ 450247919Sdbstruct group * 451247919Sdbgr_add(const struct group *gr, const char *newmember) 452247919Sdb{ 453248102Sdb char *mem; 454184831Sscf size_t len; 455185237Sscf int num_mem; 456178431Sscf 457247919Sdb num_mem = 0; 458247919Sdb len = grmemlen(gr, newmember, &num_mem); 459178431Sscf /* Create new group and copy old group into it. */ 460248102Sdb if ((mem = malloc(len)) == NULL) 461178431Sscf return (NULL); 462248102Sdb return (grcopy(gr, mem, newmember, num_mem)); 463247919Sdb} 464247919Sdb 465247919Sdb/* It is safer to walk the pointers given at gr_mem since there is no 466248102Sdb * guarantee the gr_mem + strings are contiguous in the given struct group 467248102Sdb * but compactify the new group into the following form. 468247919Sdb * 469247919Sdb * The new struct is laid out like this in memory. The example given is 470247919Sdb * for a group with two members only. 471247919Sdb * 472247919Sdb * { 473247919Sdb * (char *name) 474247919Sdb * (char *passwd) 475247919Sdb * (int gid) 476247919Sdb * (gr_mem * newgrp + sizeof(struct group) + sizeof(**)) points to gr_mem area 477247919Sdb * gr_mem area 478247919Sdb * (member1 *) 479247919Sdb * (member2 *) 480247919Sdb * (NULL) 481247919Sdb * (name string) 482247919Sdb * (passwd string) 483247919Sdb * (member1 string) 484247919Sdb * (member2 string) 485247919Sdb * } 486247919Sdb */ 487247919Sdb/* 488248102Sdb * Copy the contents of a group plus given name to a preallocated group struct 489247919Sdb */ 490247919Sdbstatic struct group * 491248102Sdbgrcopy(const struct group *gr, char *dst, const char *name, int ndx) 492247919Sdb{ 493247919Sdb int i; 494248102Sdb struct group *newgr; 495247919Sdb 496248102Sdb newgr = (struct group *)(void *)dst; /* avoid alignment warning */ 497248102Sdb dst += sizeof(*newgr); 498248102Sdb if (ndx != 0) { 499248102Sdb newgr->gr_mem = (char **)(void *)(dst); /* avoid alignment warning */ 500248102Sdb dst += (ndx + 1) * sizeof(*newgr->gr_mem); 501248102Sdb } else 502244742Sbapt newgr->gr_mem = NULL; 503178431Sscf if (gr->gr_name != NULL) { 504244742Sbapt newgr->gr_name = dst; 505244742Sbapt dst = stpcpy(dst, gr->gr_name) + 1; 506247919Sdb } else 507244777Sbapt newgr->gr_name = NULL; 508178431Sscf if (gr->gr_passwd != NULL) { 509244742Sbapt newgr->gr_passwd = dst; 510244742Sbapt dst = stpcpy(dst, gr->gr_passwd) + 1; 511247919Sdb } else 512244777Sbapt newgr->gr_passwd = NULL; 513244742Sbapt newgr->gr_gid = gr->gr_gid; 514248102Sdb i = 0; 515248102Sdb /* Original group struct might have a NULL gr_mem */ 516248102Sdb if (gr->gr_mem != NULL) { 517248102Sdb for (; gr->gr_mem[i] != NULL; i++) { 518247919Sdb newgr->gr_mem[i] = dst; 519247919Sdb dst = stpcpy(dst, gr->gr_mem[i]) + 1; 520178431Sscf } 521248102Sdb } 522248102Sdb /* If name is not NULL, newgr->gr_mem is known to be not NULL */ 523248102Sdb if (name != NULL) { 524248102Sdb newgr->gr_mem[i++] = dst; 525248102Sdb dst = stpcpy(dst, name) + 1; 526248102Sdb } 527248102Sdb /* if newgr->gr_mem is not NULL add NULL marker */ 528248102Sdb if (newgr->gr_mem != NULL) 529247919Sdb newgr->gr_mem[i] = NULL; 530248102Sdb 531244742Sbapt return (newgr); 532178431Sscf} 533178431Sscf 534178431Sscf/* 535247919Sdb * Calculate length of a struct group + given name 536244736Sbapt */ 537247919Sdbstatic size_t 538247919Sdbgrmemlen(const struct group *gr, const char *name, int *num_mem) 539244736Sbapt{ 540247919Sdb size_t len; 541247919Sdb int i; 542244736Sbapt 543247919Sdb if (gr == NULL) 544247919Sdb return (0); 545247919Sdb /* Calculate size of the group. */ 546247919Sdb len = sizeof(*gr); 547247919Sdb if (gr->gr_name != NULL) 548247919Sdb len += strlen(gr->gr_name) + 1; 549247919Sdb if (gr->gr_passwd != NULL) 550247919Sdb len += strlen(gr->gr_passwd) + 1; 551248102Sdb i = 0; 552244736Sbapt if (gr->gr_mem != NULL) { 553248102Sdb for (; gr->gr_mem[i] != NULL; i++) { 554247919Sdb len += strlen(gr->gr_mem[i]) + 1; 555247919Sdb len += sizeof(*gr->gr_mem); 556244736Sbapt } 557244736Sbapt } 558247919Sdb if (name != NULL) { 559248102Sdb i++; 560247919Sdb len += strlen(name) + 1; 561248102Sdb len += sizeof(*gr->gr_mem); 562247919Sdb } 563248102Sdb /* Allow for NULL pointer */ 564248102Sdb if (i != 0) 565248102Sdb len += sizeof(*gr->gr_mem); 566248102Sdb *num_mem = i; 567247919Sdb return(len); 568244736Sbapt} 569244736Sbapt 570244736Sbapt/* 571178431Sscf * Scan a line and place it into a group structure. 572178431Sscf */ 573178431Sscfstatic bool 574178431Sscf__gr_scan(char *line, struct group *gr) 575178431Sscf{ 576178431Sscf char *loc; 577178431Sscf int ndx; 578178431Sscf 579178431Sscf /* Assign non-member information to structure. */ 580178431Sscf gr->gr_name = line; 581178431Sscf if ((loc = strchr(line, ':')) == NULL) 582178431Sscf return (false); 583178431Sscf *loc = '\0'; 584178431Sscf gr->gr_passwd = loc + 1; 585184831Sscf if (*gr->gr_passwd == ':') 586184831Sscf *gr->gr_passwd = '\0'; 587178431Sscf else { 588178431Sscf if ((loc = strchr(loc + 1, ':')) == NULL) 589178431Sscf return (false); 590178431Sscf *loc = '\0'; 591178431Sscf } 592184831Sscf if (sscanf(loc + 1, "%u", &gr->gr_gid) != 1) 593178431Sscf return (false); 594178431Sscf 595178431Sscf /* Assign member information to structure. */ 596178431Sscf if ((loc = strchr(loc + 1, ':')) == NULL) 597178431Sscf return (false); 598178431Sscf line = loc + 1; 599178431Sscf gr->gr_mem = NULL; 600185237Sscf ndx = 0; 601185237Sscf do { 602185237Sscf gr->gr_mem = reallocf(gr->gr_mem, sizeof(*gr->gr_mem) * 603185237Sscf (ndx + 1)); 604185237Sscf if (gr->gr_mem == NULL) 605185237Sscf return (false); 606185237Sscf 607185237Sscf /* Skip locations without members (i.e., empty string). */ 608178431Sscf do { 609178431Sscf gr->gr_mem[ndx] = strsep(&line, ","); 610185237Sscf } while (gr->gr_mem[ndx] != NULL && *gr->gr_mem[ndx] == '\0'); 611185237Sscf } while (gr->gr_mem[ndx++] != NULL); 612178431Sscf 613178431Sscf return (true); 614178431Sscf} 615178431Sscf 616178431Sscf/* 617178431Sscf * Create a struct group from a line. 618178431Sscf */ 619178431Sscfstruct group * 620178431Sscfgr_scan(const char *line) 621178431Sscf{ 622184831Sscf struct group gr; 623185237Sscf char *line_copy; 624185237Sscf struct group *new_gr; 625178431Sscf 626185237Sscf if ((line_copy = strdup(line)) == NULL) 627178431Sscf return (NULL); 628185237Sscf if (!__gr_scan(line_copy, &gr)) { 629185237Sscf free(line_copy); 630178431Sscf return (NULL); 631178431Sscf } 632185237Sscf new_gr = gr_dup(&gr); 633185237Sscf free(line_copy); 634178431Sscf if (gr.gr_mem != NULL) 635178431Sscf free(gr.gr_mem); 636178431Sscf 637185237Sscf return (new_gr); 638178431Sscf} 639