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Diffstat (limited to 'man/man3/shadow.3')
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diff --git a/man/man3/shadow.3 b/man/man3/shadow.3 new file mode 100644 index 0000000..4249c5d --- /dev/null +++ b/man/man3/shadow.3 @@ -0,0 +1,245 @@ +'\" t +.\" Title: shadow +.\" Author: Julianne Frances Haugh +.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/> +.\" Date: 11/08/2022 +.\" Manual: Library Calls +.\" Source: shadow-utils 4.13 +.\" Language: English +.\" +.TH "SHADOW" "3" "11/08/2022" "shadow\-utils 4\&.13" "Library Calls" +.\" ----------------------------------------------------------------- +.\" * Define some portability stuff +.\" ----------------------------------------------------------------- +.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +.\" http://bugs.debian.org/507673 +.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html +.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +.ie \n(.g .ds Aq \(aq +.el .ds Aq ' +.\" ----------------------------------------------------------------- +.\" * set default formatting +.\" ----------------------------------------------------------------- +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.\" ----------------------------------------------------------------- +.\" * MAIN CONTENT STARTS HERE * +.\" ----------------------------------------------------------------- +.SH "NAME" +shadow, getspnam \- encrypted password file routines +.SH "SYNTAX" +.PP +\fI#include <shadow\&.h>\fR +.PP +\fIstruct spwd *getspent();\fR +.PP +\fIstruct spwd *getspnam(char\fR +\fI*name\fR\fI);\fR +.PP +\fIvoid setspent();\fR +.PP +\fIvoid endspent();\fR +.PP +\fIstruct spwd *fgetspent(FILE\fR +\fI*fp\fR\fI);\fR +.PP +\fIstruct spwd *sgetspent(char\fR +\fI*cp\fR\fI);\fR +.PP +\fIint putspent(struct spwd\fR +\fI*p,\fR +\fIFILE\fR +\fI*fp\fR\fI);\fR +.PP +\fIint lckpwdf();\fR +.PP +\fIint ulckpwdf();\fR +.SH "DESCRIPTION" +.PP +\fIshadow\fR +manipulates the contents of the shadow password file, +/etc/shadow\&. The structure in the +\fI#include\fR +file is: +.sp +.if n \{\ +.RS 4 +.\} +.nf +struct spwd { + char *sp_namp; /* user login name */ + char *sp_pwdp; /* encrypted password */ + long int sp_lstchg; /* last password change */ + long int sp_min; /* days until change allowed\&. */ + long int sp_max; /* days before change required */ + long int sp_warn; /* days warning for expiration */ + long int sp_inact; /* days before account inactive */ + long int sp_expire; /* date when account expires */ + unsigned long int sp_flag; /* reserved for future use */ +} + +.fi +.if n \{\ +.RE +.\} +.PP +The meanings of each field are: +.sp +.RS 4 +.ie n \{\ +\h'-04'\(bu\h'+03'\c +.\} +.el \{\ +.sp -1 +.IP \(bu 2.3 +.\} +sp_namp \- pointer to null\-terminated user name +.RE +.sp +.RS 4 +.ie n \{\ +\h'-04'\(bu\h'+03'\c +.\} +.el \{\ +.sp -1 +.IP \(bu 2.3 +.\} +sp_pwdp \- pointer to null\-terminated password +.RE +.sp +.RS 4 +.ie n \{\ +\h'-04'\(bu\h'+03'\c +.\} +.el \{\ +.sp -1 +.IP \(bu 2.3 +.\} +sp_lstchg \- days since Jan 1, 1970 password was last changed +.RE +.sp +.RS 4 +.ie n \{\ +\h'-04'\(bu\h'+03'\c +.\} +.el \{\ +.sp -1 +.IP \(bu 2.3 +.\} +sp_min \- days before which password may not be changed +.RE +.sp +.RS 4 +.ie n \{\ +\h'-04'\(bu\h'+03'\c +.\} +.el \{\ +.sp -1 +.IP \(bu 2.3 +.\} +sp_max \- days after which password must be changed +.RE +.sp +.RS 4 +.ie n \{\ +\h'-04'\(bu\h'+03'\c +.\} +.el \{\ +.sp -1 +.IP \(bu 2.3 +.\} +sp_warn \- days before password is to expire that user is warned of pending password expiration +.RE +.sp +.RS 4 +.ie n \{\ +\h'-04'\(bu\h'+03'\c +.\} +.el \{\ +.sp -1 +.IP \(bu 2.3 +.\} +sp_inact \- days after password expires that account is considered inactive and disabled +.RE +.sp +.RS 4 +.ie n \{\ +\h'-04'\(bu\h'+03'\c +.\} +.el \{\ +.sp -1 +.IP \(bu 2.3 +.\} +sp_expire \- days since Jan 1, 1970 when account will be disabled +.RE +.sp +.RS 4 +.ie n \{\ +\h'-04'\(bu\h'+03'\c +.\} +.el \{\ +.sp -1 +.IP \(bu 2.3 +.\} +sp_flag \- reserved for future use +.RE +.SH "DESCRIPTION" +.PP +\fIgetspent\fR, +\fIgetspname\fR, +\fIfgetspent\fR, and +\fIsgetspent\fR +each return a pointer to a +\fIstruct spwd\fR\&. +\fIgetspent\fR +returns the next entry from the file, and +\fIfgetspent\fR +returns the next entry from the given stream, which is assumed to be a file of the proper format\&. +\fIsgetspent\fR +returns a pointer to a +\fIstruct spwd\fR +using the provided string as input\&. +\fIgetspnam\fR +searches from the current position in the file for an entry matching +\fIname\fR\&. +.PP +\fIsetspent\fR +and +\fIendspent\fR +may be used to begin and end, respectively, access to the shadow password file\&. +.PP +The +\fIlckpwdf\fR +and +\fIulckpwdf\fR +routines should be used to insure exclusive access to the +/etc/shadow +file\&. +\fIlckpwdf\fR +attempts to acquire a lock using +\fIpw_lock\fR +for up to 15 seconds\&. It continues by attempting to acquire a second lock using +\fIspw_lock\fR +for the remainder of the initial 15 seconds\&. Should either attempt fail after a total of 15 seconds, +\fIlckpwdf\fR +returns \-1\&. When both locks are acquired 0 is returned\&. +.SH "DIAGNOSTICS" +.PP +Routines return NULL if no more entries are available or if an error occurs during processing\&. Routines which have +\fIint\fR +as the return value return 0 for success and \-1 for failure\&. +.SH "CAVEATS" +.PP +These routines may only be used by the superuser as access to the shadow password file is restricted\&. +.SH "FILES" +.PP +/etc/shadow +.RS 4 +Secure user account information\&. +.RE +.SH "SEE ALSO" +.PP +\fBgetpwent\fR(3), +\fBshadow\fR(5)\&. |