229 lines
5.7 KiB
C
229 lines
5.7 KiB
C
/*-
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* Copyright (c) 2008 Sean C. Farley <scf@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer,
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* without modification, immediately at the beginning of the file.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <grp.h>
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#include <inttypes.h>
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#include <libutil.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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static const char GroupLineFormat[] = "%s:%s:%ju:";
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/*
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* Compares two struct group's.
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*/
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int
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gr_equal(const struct group *gr1, const struct group *gr2)
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{
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int gr1Ndx;
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int gr2Ndx;
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bool equal;
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bool found;
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/* Check that the non-member information is the same. */
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equal = strcmp(gr1->gr_name, gr2->gr_name) == 0 &&
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strcmp(gr1->gr_passwd, gr2->gr_passwd) == 0 &&
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gr1->gr_gid == gr2->gr_gid;
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/* Check all members in both groups. */
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if (equal) {
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for (found = false, gr1Ndx = 0; gr1->gr_mem[gr1Ndx] != NULL;
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gr1Ndx++) {
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for (gr2Ndx = 0; gr2->gr_mem[gr2Ndx] != NULL; gr2Ndx++)
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if (strcmp(gr1->gr_mem[gr1Ndx],
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gr2->gr_mem[gr2Ndx]) == 0) {
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found = true;
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break;
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}
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if (! found) {
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equal = false;
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break;
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}
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}
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/* Check that group2 does not have more members than group1. */
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if (gr2->gr_mem[gr1Ndx] != NULL)
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equal = false;
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}
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return (equal);
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}
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/*
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* Make a group line out of a struct group.
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*/
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char *
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gr_make(const struct group *gr)
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{
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char *line;
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size_t lineSize;
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int ndx;
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/* Calculate the length of the group line. */
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lineSize = snprintf(NULL, 0, GroupLineFormat, gr->gr_name,
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gr->gr_passwd, (uintmax_t)gr->gr_gid) + 1;
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for (ndx = 0; gr->gr_mem[ndx] != NULL; ndx++)
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lineSize += strlen(gr->gr_mem[ndx]) + 1;
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if (ndx > 0)
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lineSize--;
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/* Create the group line and fill it. */
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if ((line = malloc(lineSize)) == NULL)
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return (NULL);
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lineSize = snprintf(line, lineSize, GroupLineFormat, gr->gr_name,
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gr->gr_passwd, (uintmax_t)gr->gr_gid);
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for (ndx = 0; gr->gr_mem[ndx] != NULL; ndx++) {
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strcat(line, gr->gr_mem[ndx]);
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if (gr->gr_mem[ndx + 1] != NULL)
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strcat(line, ",");
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}
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return (line);
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}
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/*
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* Duplicate a struct group.
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*/
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struct group *
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gr_dup(const struct group *gr)
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{
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size_t len;
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struct group *ngr;
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int ndx;
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int numMem;
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/* Calculate size of group. */
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len = sizeof(*gr) +
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(gr->gr_name != NULL ? strlen(gr->gr_name) + 1 : 0) +
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(gr->gr_passwd != NULL ? strlen(gr->gr_passwd) + 1 : 0);
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numMem = 0;
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if (gr->gr_mem != NULL) {
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for (; gr->gr_mem[numMem] != NULL; numMem++)
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len += strlen(gr->gr_mem[numMem]) + 1;
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len += (numMem + 1) * sizeof(*gr->gr_mem);
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}
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/* Create new group and copy old group into it. */
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if ((ngr = calloc(1, len)) == NULL)
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return (NULL);
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len = sizeof(*ngr);
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ngr->gr_gid = gr->gr_gid;
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if (gr->gr_name != NULL) {
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ngr->gr_name = (char *)ngr + len;
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len += sprintf(ngr->gr_name, "%s", gr->gr_name) + 1;
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}
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if (gr->gr_passwd != NULL) {
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ngr->gr_passwd = (char *)ngr + len;
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len += sprintf(ngr->gr_passwd, "%s", gr->gr_passwd) + 1;
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}
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if (gr->gr_mem != NULL) {
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ngr->gr_mem = (char **)((char *)ngr + len);
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len += (numMem + 1) * sizeof(*ngr->gr_mem);
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for (ndx = 0; gr->gr_mem[ndx] != NULL; ndx++) {
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ngr->gr_mem[ndx] = (char *)ngr + len;
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len += sprintf(ngr->gr_mem[ndx], "%s",
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gr->gr_mem[ndx]) + 1;
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}
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ngr->gr_mem[ndx] = NULL;
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}
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return (ngr);
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}
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/*
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* Scan a line and place it into a group structure.
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*/
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static bool
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__gr_scan(char *line, struct group *gr)
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{
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char *loc;
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int ndx;
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/* Assign non-member information to structure. */
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gr->gr_name = line;
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if ((loc = strchr(line, ':')) == NULL)
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return (false);
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*loc = '\0';
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gr->gr_passwd = loc + 1;
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if (*gr->gr_passwd == ':')
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*gr->gr_passwd = '\0';
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else {
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if ((loc = strchr(loc + 1, ':')) == NULL)
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return (false);
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*loc = '\0';
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}
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if (sscanf(loc + 1, "%u", &gr->gr_gid) != 1)
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return (false);
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/* Assign member information to structure. */
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if ((loc = strchr(loc + 1, ':')) == NULL)
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return (false);
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line = loc + 1;
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gr->gr_mem = NULL;
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if (*line != '\0') {
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ndx = 0;
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do {
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if ((gr->gr_mem = reallocf(gr->gr_mem,
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sizeof(*gr->gr_mem) * (ndx + 1))) == NULL)
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return (false);
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gr->gr_mem[ndx] = strsep(&line, ",");
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} while (gr->gr_mem[ndx++] != NULL);
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}
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return (true);
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}
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/*
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* Create a struct group from a line.
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*/
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struct group *
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gr_scan(const char *line)
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{
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struct group gr;
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char *lineCopy;
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struct group *newGr;
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if ((lineCopy = strdup(line)) == NULL)
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return (NULL);
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if (!__gr_scan(lineCopy, &gr)) {
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free(lineCopy);
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return (NULL);
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}
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newGr = gr_dup(&gr);
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free(lineCopy);
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if (gr.gr_mem != NULL)
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free(gr.gr_mem);
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return (newGr);
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}
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