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/*++
/* NAME
/* logwriter 3
/* SUMMARY
/* logfile writer
/* SYNOPSIS
/* #include <logwriter.h>
/*
/* VSTREAM *logwriter_open_or_die(
/* const char *path)
/*
/* int logwriter_write(
/* VSTREAM *file,
/* const char *buffer.
/* ssize_t buflen)
/*
/* int logwriter_close(
/* VSTREAM *file)
/*
/* int logwriter_one_shot(
/* const char *path,
/* const char *buffer,
/* ssize_t buflen)
/*
/* int set_logwriter_create_perms(
/* const char *mode)
/* DESCRIPTION
/* This module manages a logfile writer.
/*
/* logwriter_open_or_die() safely opens the specified file in
/* write+append mode. File open/create errors are fatal.
/*
/* logwriter_write() writes the buffer plus newline to the
/* open logfile. The result is zero if successful, VSTREAM_EOF
/* if the operation failed.
/*
/* logwriter_close() closes the logfile and destroys the VSTREAM
/* instance. The result is zero if there were no errors writing
/* the file, VSTREAM_EOF otherwise.
/*
/* logwriter_one_shot() combines all the above operations. The
/* result is zero if successful, VSTREAM_EOF if any operation
/* failed.
/*
/* set_logwriter_create_perms() sets the file permissions that
/* will be used when creating a logfile. Valid inputs are
/* "644", "640", and "600". Leading zeros are allowed and
/* ignored.
/* DIAGNOSTICS
/* Fatal error: logfile create error; warning: logfile permission
/* change error. set_logwriter_create_perms() returns the file
/* create permission if the request is valid, -1 otherwise.
/* LICENSE
/* .ad
/* .fi
/* The Secure Mailer license must be distributed with this software.
/* AUTHOR(S)
/* Wietse Venema
/* Google, Inc.
/* 111 8th Avenue
/* New York, NY 10011, USA
/*--*/
/*
* System library.
*/
#include <sys_defs.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
/*
* Utility library.
*/
#include <iostuff.h>
#include <logwriter.h>
#include <msg.h>
#include <mymalloc.h>
#include <safe_open.h>
#include <vstream.h>
#include <name_code.h>
/*
* Application-specific.
*/
static int logwriter_perms = 0600;
/* logwriter_open_or_die - open logfile */
VSTREAM *logwriter_open_or_die(const char *path)
{
VSTREAM *fp;
VSTRING *why = vstring_alloc(100);
#define NO_STATP ((struct stat *) 0)
#define NO_CHOWN (-1)
#define NO_CHGRP (-1)
fp = safe_open(path, O_CREAT | O_WRONLY | O_APPEND, logwriter_perms,
NO_STATP, NO_CHOWN, NO_CHGRP, why);
if (fp == 0)
msg_fatal("open logfile '%s': %s", path, vstring_str(why));
close_on_exec(vstream_fileno(fp), CLOSE_ON_EXEC);
vstring_free(why);
return (fp);
}
/* logwriter_write - append to logfile */
int logwriter_write(VSTREAM *fp, const char *buf, ssize_t len)
{
if (len < 0)
msg_panic("logwriter_write: negative length %ld", (long) len);
if (vstream_fwrite(fp, buf, len) != len)
return (VSTREAM_EOF);
VSTREAM_PUTC('\n', fp);
return (vstream_fflush(fp));
}
/* logwriter_close - close logfile */
int logwriter_close(VSTREAM *fp)
{
return (vstream_fclose(fp));
}
/* logwriter_one_shot - one-shot logwriter */
int logwriter_one_shot(const char *path, const char *buf, ssize_t len)
{
VSTREAM *fp;
int err;
fp = logwriter_open_or_die(path);
err = logwriter_write(fp, buf, len);
err |= logwriter_close(fp);
return (err ? VSTREAM_EOF : 0);
}
/* set_logwriter_create_perms - logfile permission control */
int set_logwriter_create_perms(const char *mode_str)
{
static const NAME_CODE sane_perms[] = {
"644", 0644,
"640", 0640,
"600", 0600,
0, -1,
};
int perms;
if ((perms = name_code(sane_perms, NAME_CODE_FLAG_NONE,
mode_str + strspn(mode_str, "0"))) != -1)
logwriter_perms = perms;
return (perms);
}
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