mirror of
https://github.com/sudo-project/sudo.git
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Rework source layout in preparation for modular sudo.
This commit is contained in:
Todd C. Miller
305
plugins/sudoers/tsgetgrpw.c
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305
plugins/sudoers/tsgetgrpw.c
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/*
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* Copyright (c) 2005,2008 Todd C. Miller <Todd.Miller@courtesan.com>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/*
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* Trivial replacements for the libc get{gr,pw}{uid,nam}() routines
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* for use by testsudoers in the sudo test harness.
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* We need our own since many platforms don't provide set{pw,gr}file().
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*/
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#include <config.h>
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#include <sys/types.h>
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#include <sys/param.h>
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#include <stdio.h>
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#ifdef STDC_HEADERS
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# include <stdlib.h>
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# include <stddef.h>
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#else
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# ifdef HAVE_STDLIB_H
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# include <stdlib.h>
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# endif
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#endif /* STDC_HEADERS */
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#ifdef HAVE_STRING_H
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# if defined(HAVE_MEMORY_H) && !defined(STDC_HEADERS)
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# include <memory.h>
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# endif
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# include <string.h>
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#else
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# ifdef HAVE_STRINGS_H
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# include <strings.h>
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# endif
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#endif /* HAVE_STRING_H */
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#include <limits.h>
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#include <pwd.h>
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#include <grp.h>
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#include "sudo.h"
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#ifndef LINE_MAX
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# define LINE_MAX 2048
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#endif
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#undef GRMEM_MAX
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#define GRMEM_MAX 200
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static FILE *pwf;
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static const char *pwfile = "/etc/passwd";
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static int pw_stayopen;
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static FILE *grf;
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static const char *grfile = "/etc/group";
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static int gr_stayopen;
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void setgrfile __P((const char *));
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void setgrent __P((void));
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void endgrent __P((void));
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struct group *getgrent __P((void));
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struct group *getgrnam __P((const char *));
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struct group *getgrgid __P((gid_t));
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void setpwfile __P((const char *));
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void setpwent __P((void));
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void endpwent __P((void));
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struct passwd *getpwent __P((void));
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struct passwd *getpwnam __P((const char *));
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struct passwd *getpwuid __P((uid_t));
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void
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setpwfile(file)
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const char *file;
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{
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pwfile = file;
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if (pwf != NULL)
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endpwent();
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}
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void
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setpwent()
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{
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if (pwf == NULL)
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pwf = fopen(pwfile, "r");
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else
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rewind(pwf);
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pw_stayopen = 1;
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}
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void
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endpwent()
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{
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if (pwf != NULL) {
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fclose(pwf);
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pwf = NULL;
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}
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pw_stayopen = 0;
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}
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struct passwd *
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getpwent()
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{
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static struct passwd pw;
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static char pwbuf[LINE_MAX];
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size_t len;
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char *cp, *colon;
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if ((colon = fgets(pwbuf, sizeof(pwbuf), pwf)) == NULL)
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return(NULL);
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zero_bytes(&pw, sizeof(pw));
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if ((colon = strchr(cp = colon, ':')) == NULL)
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return(NULL);
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*colon++ = '\0';
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pw.pw_name = cp;
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if ((colon = strchr(cp = colon, ':')) == NULL)
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return(NULL);
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*colon++ = '\0';
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pw.pw_passwd = cp;
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if ((colon = strchr(cp = colon, ':')) == NULL)
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return(NULL);
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*colon++ = '\0';
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pw.pw_uid = atoi(cp);
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if ((colon = strchr(cp = colon, ':')) == NULL)
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return(NULL);
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*colon++ = '\0';
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pw.pw_gid = atoi(cp);
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if ((colon = strchr(cp = colon, ':')) == NULL)
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return(NULL);
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*colon++ = '\0';
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pw.pw_gecos = cp;
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if ((colon = strchr(cp = colon, ':')) == NULL)
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return(NULL);
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*colon++ = '\0';
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pw.pw_dir = cp;
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pw.pw_shell = colon;
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len = strlen(colon);
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if (len > 0 && colon[len - 1] == '\n')
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colon[len - 1] = '\0';
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return(&pw);
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}
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struct passwd *
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getpwnam(name)
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const char *name;
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{
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struct passwd *pw;
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if (pwf != NULL)
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rewind(pwf);
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else if ((pwf = fopen(pwfile, "r")) == NULL)
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return(NULL);
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while ((pw = getpwent()) != NULL) {
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if (strcmp(pw->pw_name, name) == 0)
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break;
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}
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if (!pw_stayopen) {
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fclose(pwf);
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pwf = NULL;
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}
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return(pw);
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}
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struct passwd *
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getpwuid(uid)
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uid_t uid;
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{
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struct passwd *pw;
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if (pwf != NULL)
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rewind(pwf);
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else if ((pwf = fopen(pwfile, "r")) == NULL)
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return(NULL);
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while ((pw = getpwent()) != NULL) {
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if (pw->pw_uid == uid)
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break;
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}
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if (!pw_stayopen) {
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fclose(pwf);
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pwf = NULL;
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}
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return(pw);
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}
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void
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setgrfile(file)
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const char *file;
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{
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grfile = file;
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if (grf != NULL)
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endgrent();
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}
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void
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setgrent()
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{
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if (grf == NULL)
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grf = fopen(grfile, "r");
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else
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rewind(grf);
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gr_stayopen = 1;
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}
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void
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endgrent()
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{
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if (grf != NULL) {
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fclose(grf);
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grf = NULL;
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}
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gr_stayopen = 0;
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}
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struct group *
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getgrent()
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{
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static struct group gr;
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static char grbuf[LINE_MAX], *gr_mem[GRMEM_MAX+1];
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size_t len;
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char *cp, *colon;
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int n;
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if ((colon = fgets(grbuf, sizeof(grbuf), grf)) == NULL)
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return(NULL);
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zero_bytes(&gr, sizeof(gr));
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if ((colon = strchr(cp = colon, ':')) == NULL)
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return(NULL);
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*colon++ = '\0';
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gr.gr_name = cp;
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if ((colon = strchr(cp = colon, ':')) == NULL)
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return(NULL);
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*colon++ = '\0';
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gr.gr_passwd = cp;
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if ((colon = strchr(cp = colon, ':')) == NULL)
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return(NULL);
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*colon++ = '\0';
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gr.gr_gid = atoi(cp);
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len = strlen(colon);
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if (len > 0 && colon[len - 1] == '\n')
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colon[len - 1] = '\0';
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if (*colon != '\0') {
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gr.gr_mem = gr_mem;
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cp = strtok(colon, ",");
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for (n = 0; cp != NULL && n < GRMEM_MAX; n++) {
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gr.gr_mem[n] = cp;
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cp = strtok(NULL, ",");
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}
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gr.gr_mem[n++] = NULL;
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} else
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gr.gr_mem = NULL;
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return(&gr);
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}
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struct group *
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getgrnam(name)
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const char *name;
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{
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struct group *gr;
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if (grf != NULL)
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rewind(grf);
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else if ((grf = fopen(grfile, "r")) == NULL)
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return(NULL);
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while ((gr = getgrent()) != NULL) {
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if (strcmp(gr->gr_name, name) == 0)
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break;
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}
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if (!gr_stayopen) {
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fclose(grf);
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grf = NULL;
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}
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return(gr);
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}
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struct group *
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getgrgid(gid)
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gid_t gid;
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{
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struct group *gr;
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if (grf != NULL)
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rewind(grf);
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else if ((grf = fopen(grfile, "r")) == NULL)
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return(NULL);
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while ((gr = getgrent()) != NULL) {
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if (gr->gr_gid == gid)
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break;
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}
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if (!gr_stayopen) {
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fclose(grf);
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grf = NULL;
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}
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return(gr);
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}
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