84 lines
2.3 KiB
C
84 lines
2.3 KiB
C
/* $OpenBSD: pw_dup.c,v 1.9 2019/01/25 00:19:25 millert Exp $ */
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/*
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* Copyright (c) 2000, 2002 Todd C. Miller <millert@openbsd.org>
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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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* Sponsored in part by the Defense Advanced Research Projects
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* Agency (DARPA) and Air Force Research Laboratory, Air Force
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* Materiel Command, USAF, under agreement number F39502-99-1-0512.
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*/
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#include <sys/types.h>
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#include <pwd.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#define PW_SIZE(name, size) \
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do { \
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if (pw->name) { \
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size = strlen(pw->name) + 1; \
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total += size; \
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} \
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} while (0)
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#define PW_COPY(name, size) \
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do { \
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if (pw->name) { \
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(void)memcpy(cp, pw->name, size); \
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newpw->name = cp; \
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cp += size; \
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} \
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} while (0)
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struct passwd *
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pw_dup(const struct passwd *pw)
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{
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char *cp;
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size_t nsize, psize, csize, gsize, dsize, ssize, total;
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struct passwd *newpw;
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/* Allocate in one big chunk for easy freeing */
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total = sizeof(struct passwd);
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PW_SIZE(pw_name, nsize);
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PW_SIZE(pw_passwd, psize);
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PW_SIZE(pw_class, csize);
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PW_SIZE(pw_gecos, gsize);
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PW_SIZE(pw_dir, dsize);
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PW_SIZE(pw_shell, ssize);
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if ((cp = malloc(total)) == NULL)
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return (NULL);
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newpw = (struct passwd *)cp;
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/*
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* Copy in passwd contents and make strings relative to space
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* at the end of the buffer.
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*/
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(void)memcpy(newpw, pw, sizeof(struct passwd));
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cp += sizeof(struct passwd);
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PW_COPY(pw_name, nsize);
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PW_COPY(pw_passwd, psize);
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PW_COPY(pw_class, csize);
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PW_COPY(pw_gecos, gsize);
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PW_COPY(pw_dir, dsize);
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PW_COPY(pw_shell, ssize);
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return (newpw);
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}
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DEF_WEAK(pw_dup);
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