137 lines
3.9 KiB
C
137 lines
3.9 KiB
C
/*
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* Copyright 1989 - 1994, Julianne Frances Haugh
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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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* 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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* 3. Neither the name of Julianne F. Haugh nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY JULIE HAUGH AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL JULIE HAUGH OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <config.h>
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#include "rcsid.h"
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RCSID("$Id: sgetpwent.c,v 1.5 1998/04/02 21:51:46 marekm Exp $")
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#include <sys/types.h>
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#include "defines.h"
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#include <stdio.h>
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#include <pwd.h>
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#define NFIELDS 7
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/*
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* sgetpwent - convert a string to a (struct passwd)
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*
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* sgetpwent() parses a string into the parts required for a password
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* structure. Strict checking is made for the UID and GID fields and
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* presence of the correct number of colons. Any failing tests result
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* in a NULL pointer being returned.
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*
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* NOTE: This function uses hard-coded string scanning functions for
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* performance reasons. I am going to come up with some conditional
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* compilation glarp to improve on this in the future.
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*/
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struct passwd *
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sgetpwent(const char *buf)
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{
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static struct passwd pwent;
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static char pwdbuf[1024];
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register int i;
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register char *cp;
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char *ep;
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char *fields[NFIELDS];
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/*
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* Copy the string to a static buffer so the pointers into
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* the password structure remain valid.
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*/
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if (strlen(buf) >= sizeof pwdbuf)
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return 0; /* fail if too long */
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strcpy(pwdbuf, buf);
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/*
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* Save a pointer to the start of each colon separated
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* field. The fields are converted into NUL terminated strings.
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*/
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for (cp = pwdbuf, i = 0;i < NFIELDS && cp;i++) {
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fields[i] = cp;
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while (*cp && *cp != ':')
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++cp;
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if (*cp)
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*cp++ = '\0';
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else
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cp = 0;
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}
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/*
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* There must be exactly NFIELDS colon separated fields or
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* the entry is invalid. Also, the UID and GID must be non-blank.
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*/
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if (i != NFIELDS || *fields[2] == '\0' || *fields[3] == '\0')
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return 0;
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/*
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* Each of the fields is converted the appropriate data type
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* and the result assigned to the password structure. If the
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* UID or GID does not convert to an integer value, a NULL
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* pointer is returned.
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*/
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pwent.pw_name = fields[0];
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pwent.pw_passwd = fields[1];
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if (fields[2][0] == '\0' ||
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((pwent.pw_uid = strtol (fields[2], &ep, 10)) == 0 && *ep)) {
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return 0;
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}
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if (fields[3][0] == '\0' ||
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((pwent.pw_gid = strtol (fields[3], &ep, 10)) == 0 && *ep)) {
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return 0;
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}
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#ifdef ATT_AGE
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cp = pwent.pw_passwd;
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while (*cp && *cp != ',')
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++cp;
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if (*cp) {
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*cp++ = '\0';
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pwent.pw_age = cp;
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} else {
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cp = 0;
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pwent.pw_age = "";
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}
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#endif
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pwent.pw_gecos = fields[4];
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#ifdef ATT_COMMENT
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pwent.pw_comment = "";
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#endif
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pwent.pw_dir = fields[5];
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pwent.pw_shell = fields[6];
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return &pwent;
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}
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