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1.8.7

    1: /*
    2:  * Copyright (c) 2000, 2002, 2012-2013
    3:  *	Todd C. Miller <Todd.Miller@courtesan.com>
    4:  *
    5:  * Permission to use, copy, modify, and distribute this software for any
    6:  * purpose with or without fee is hereby granted, provided that the above
    7:  * copyright notice and this permission notice appear in all copies.
    8:  *
    9:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   10:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   11:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
   12:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   13:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   14:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   15:  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   16:  *
   17:  * Sponsored in part by the Defense Advanced Research Projects
   18:  * Agency (DARPA) and Air Force Research Laboratory, Air Force
   19:  * Materiel Command, USAF, under agreement number F39502-99-1-0512.
   20:  */
   21: 
   22: #include <config.h>
   23: 
   24: #ifndef HAVE_PW_DUP
   25: 
   26: #include <sys/types.h>
   27: 
   28: #include <stdio.h>
   29: #ifdef STDC_HEADERS
   30: # include <stdlib.h>
   31: # include <stddef.h>
   32: #else
   33: # ifdef HAVE_STDLIB_H
   34: #  include <stdlib.h>
   35: # endif
   36: #endif /* STDC_HEADERS */
   37: #ifdef HAVE_STRING_H
   38: # include <string.h>
   39: #endif /* HAVE_STRING_H */
   40: #ifdef HAVE_STRINGS_H
   41: # include <strings.h>
   42: #endif /* HAVE_STRINGS_H */
   43: #if defined(HAVE_MALLOC_H) && !defined(STDC_HEADERS)
   44: # include <malloc.h>
   45: #endif /* HAVE_MALLOC_H && !STDC_HEADERS */
   46: #include <pwd.h>
   47: 
   48: #define PW_SIZE(name, size)				\
   49: do {							\
   50: 	if (pw->name) {					\
   51: 		size = strlen(pw->name) + 1;		\
   52: 		total += size;				\
   53: 	}						\
   54: } while (0)
   55: 
   56: #define PW_COPY(name, size)				\
   57: do {							\
   58: 	if (pw->name) {					\
   59: 		(void)memcpy(cp, pw->name, size);	\
   60: 		newpw->name = cp;			\
   61: 		cp += size;				\
   62: 	}						\
   63: } while (0)
   64: 
   65: struct passwd *
   66: pw_dup(const struct passwd *pw)
   67: {
   68: 	size_t nsize = 0, psize = 0, gsize = 0, dsize = 0, ssize = 0, total;
   69: #ifdef HAVE_LOGIN_CAP_H
   70: 	size_t csize;
   71: #endif
   72: 	struct passwd *newpw;
   73: 	char *cp;
   74: 
   75: 	/* Allocate in one big chunk for easy freeing */
   76: 	total = sizeof(struct passwd);
   77: 	PW_SIZE(pw_name, nsize);
   78: 	PW_SIZE(pw_passwd, psize);
   79: #ifdef HAVE_LOGIN_CAP_H
   80: 	PW_SIZE(pw_class, csize);
   81: #endif
   82: 	PW_SIZE(pw_gecos, gsize);
   83: 	PW_SIZE(pw_dir, dsize);
   84: 	PW_SIZE(pw_shell, ssize);
   85: 
   86: 	if ((cp = malloc(total)) == NULL)
   87: 		return NULL;
   88: 	newpw = (struct passwd *)cp;
   89: 
   90: 	/*
   91: 	 * Copy in passwd contents and make strings relative to space
   92: 	 * at the end of the buffer.
   93: 	 */
   94: 	(void)memcpy(newpw, pw, sizeof(struct passwd));
   95: 	cp += sizeof(struct passwd);
   96: 
   97: 	PW_COPY(pw_name, nsize);
   98: 	PW_COPY(pw_passwd, psize);
   99: #ifdef HAVE_LOGIN_CAP_H
  100: 	PW_COPY(pw_class, csize);
  101: #endif
  102: 	PW_COPY(pw_gecos, gsize);
  103: 	PW_COPY(pw_dir, dsize);
  104: 	PW_COPY(pw_shell, ssize);
  105: 
  106: 	return newpw;
  107: }
  108: #endif /* HAVE_PW_DUP */