/*
 * env.c -- small service routines
 *
 * Copyright 1998 by Eric S. Raymond
 * For license terms, see the file COPYING in this directory.
 */

#include "config.h"
#include <stdio.h>
#include <ctype.h>
#if defined(STDC_HEADERS)
#include <stdlib.h>
#endif
#if defined(HAVE_UNISTD_H)
#include <unistd.h>
#endif
#include <pwd.h>
#include <string.h>
#ifdef HAVE_NET_SOCKET_H
#include <net/socket.h>
#endif
#include <netdb.h>
#include <sys/types.h>
#include <sys/socket.h>
#include "fetchmail.h"
#include "getaddrinfo.h"

#include "i18n.h"
#if defined(HAVE_SETLOCALE) && defined(ENABLE_NLS) && defined(HAVE_STRFTIME)
#include <locale.h>
#endif

#ifndef HAVE_DECL_GETENV
extern char *getenv(const char *);	/* needed on sysV68 R3V7.1. */
#endif

void envquery(int argc, char **argv)
/* set up basic stuff from the environment (including the rc file name) */
{
    struct passwd by_name, by_uid, *pwp;

    (void)argc;

    (void)argc;
    if (!(user = getenv("FETCHMAILUSER")))
    {
	if (!(user = getenv("LOGNAME")))
	{
	    user = getenv("USER");
	}
    }

    if ((program_name = strrchr(argv[0], '/')) != NULL)
	++program_name;
    else
	program_name = argv[0];

    if (getenv("QMAILINJECT") && strcmp(getenv("QMAILINJECT"), ""))
    {
	fprintf(stderr,
		GT_("%s: The QMAILINJECT environment variable is set.\n"
		    "This is dangerous as it can make qmail-inject or qmail's sendmail wrapper\n"  
		    "tamper with your From: or Message-ID: headers.\n"
		    "Try \"env QMAILINJECT= %s YOUR ARGUMENTS HERE\"\n"
		    "%s: Abort.\n"), 
		program_name, program_name, program_name);
	exit(PS_UNDEFINED);
    }

    if (getenv("NULLMAILER_FLAGS") && strcmp(getenv("NULLMAILER_FLAGS"), ""))
    {
	fprintf(stderr,
		GT_("%s: The NULLMAILER_FLAGS environment variable is set.\n"
		    "This is dangerous as it can make nullmailer-inject or nullmailer's\n" 
		    "sendmail wrapper tamper with your From:, Message-ID: or Return-Path: headers.\n"
		    "Try \"env NULLMAILER_FLAGS= %s YOUR ARGUMENTS HERE\"\n"
		    "%s: Abort.\n"), 
		program_name, program_name, program_name);
	exit(PS_UNDEFINED);
    }

    if (!(pwp = getpwuid(getuid())))
    {
	fprintf(stderr,
		GT_("%s: You don't exist.  Go away.\n"),
		program_name);
	exit(PS_UNDEFINED);
    }
    else
    {
	memcpy(&by_uid, pwp, sizeof(struct passwd));
	if (!user || !(pwp = getpwnam(user)))
	    pwp = &by_uid;
	else
	{
	    /*
	     * This logic is needed to handle gracefully the possibility
	     * that multiple names might be mapped to one UID.
	     */
	    memcpy(&by_name, pwp, sizeof(struct passwd));

	    if (by_name.pw_uid == by_uid.pw_uid)
		pwp = &by_name;
	    else
		pwp = &by_uid;
	}
	user = xstrdup(pwp->pw_name);
    }

    endpwent();

    /* compute user's home directory */
    home = getenv("HOME_ETC");
    if (!home && !(home = getenv("HOME")))
	home = xstrdup(pwp->pw_dir);

    /* compute fetchmail's home directory */
    if (!(fmhome = getenv("FETCHMAILHOME")))
	fmhome = home;

#define RCFILE_NAME	"fetchmailrc"
    /*
     * The (fmhome==home) leaves an extra character for a . at the
     * beginning of the rc file's name, iff fetchmail is using $HOME
     * for its files. We don't want to do that if fetchmail has its
     * own home ($FETCHMAILHOME), however.
     */
    rcfile = (char *)xmalloc(strlen(fmhome)+sizeof(RCFILE_NAME)+(fmhome==home)+2);
    /* avoid //.<style>pre { line-height: 125%; }
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.highlight .mh { color: #0000DD; font-weight: bold } /* Literal.Number.Hex */
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.highlight .vm { color: #336699 } /* Name.Variable.Magic */
.highlight .il { color: #0000DD; font-weight: bold } /* Literal.Number.Integer.Long */</style><div class="highlight"><pre><span></span>../fetchmail-FAQ.html
</pre></div>
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