inc.c

早期freebsd实现

/* inc.c - incorporate messages from a maildrop into a folder */
#ifndef	lint
static char ident[] = "@(#)$Id: inc.c,v 1.22 1993/09/01 21:41:48 jromine Exp $";
#endif	/* lint */

#ifdef	MAILGROUP
/* Revised: Sat Apr 14 17:08:17 PDT 1990 (marvit@hplabs)
 *    Added hpux hacks to set and reset gid to be "mail" as needed. The reset
 *    is necessary so inc'ed mail is the group of the inc'er, rather than
 *    "mail". We setgid to egid only when [un]locking the mail file. This
 *    is also a major security precaution which will not be explained here.
 *
 * Fri Feb  7 16:04:57 PST 1992		John Romine <[e-mail]>
 *   NB: I'm not 100% sure that this setgid stuff is secure even now.
 */
#endif

#include "../h/mh.h"
#ifdef	POP
#include "../h/dropsbr.h"
#endif
#ifdef KPOP
#include <krb.h>
#endif
#ifdef HESIOD
#include <hesiod.h>
#endif
#include "../h/formatsbr.h"
#include "../h/scansbr.h"
#include "../zotnet/tws.h"
#include <stdio.h>
#include "../zotnet/mts.h"
#include <errno.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/stat.h>
#ifdef LOCALE
#include	<locale.h>
#endif

/*  */

#ifndef	MF
#define	MFminc(a)	(a)
#else	/* MF */
#define	MFminc(a)	0
#endif	/* MF */

#ifndef	POP
#define	POPminc(a)	(a)
#else	/* POP */
#define	POPminc(a)	0
#endif	/* POP */

#ifndef	RPOP
#define	RPOPminc(a)	(a)
#else	/* RPOP */
#define	RPOPminc(a)	0
#endif	/* RPOP */

#ifndef	APOP
#define	APOPminc(a)	(a)
#else
#define	APOPminc(a)	0
#endif	/* APOP */

#ifndef	TMA
#define	TMAminc(a)	(a)
#else	/* TMA */
#define	TMAminc(a)	0
#endif	/* TMA */

static struct swit  switches[] = {
#define	AUDSW	0
    "audit audit-file", 0,
#define	NAUDSW	1
    "noaudit", 0,

#define	CHGSW	2
    "changecur", 0,
#define	NCHGSW	3
    "nochangecur", 0,

#define	DECRSW	4
    "decrypt", TMAminc (-7),
#define	NDECRSW	5
    "nodecrypt", TMAminc (-9),

#define	MSW	6
    "file name", 0,

#define	FORMSW	7
    "form formatfile", 0,
#define	FMTSW	8
    "format string", 5,

#define	HOSTSW	9
    "host host", POPminc (-4),
#define	USERSW	10
    "user user", POPminc (-4),
#define	PACKSW	11
    "pack file", POPminc (-4),
#define	NPACKSW	12
    "nopack", POPminc (-6),

#define	APOPSW	13
    "apop", APOPminc (-4),
#define	NAPOPSW	14
    "noapop", APOPminc (-6),

#define	RPOPSW	15
    "rpop", RPOPminc (-4),
#define	NRPOPSW	16
    "norpop", RPOPminc (-6),

#define	SILSW	17
    "silent", 0,
#define	NSILSW	18
    "nosilent", 0,

#define	TRNCSW	19
    "truncate", 0,
#define	NTRNCSW	20
    "notruncate", 0,

#define	UUCPSW	21
    "uucp", MFminc (-4),
#define	NUUCPSW	22
    "nouucp", MFminc (-6),

#define	WIDSW	23
    "width columns", 0,

#define	HELPSW	24
    "help", 4,

    NULL, 0
};

/*  */

extern int  errno;

#ifdef	POP
int  snoop = 0;
extern char response[];

static  char *file = NULL;
static int  size;
static long pos;
static long start;
static long stop;

static  int   pd = NOTOK;
static	FILE *pf = NULL;

static int	pop_action (), pop_pack ();
static int	map_count();
#endif	/* POP */

/*  * /

/* ARGSUSED */

#ifdef MAILGROUP	/* For setting and returning to "mail" gid */
static int return_gid;
#endif	/* MAILGROUP */

main (argc, argv)
int	argc;
char   *argv[];
{
    int     chgflag = 1,
	    trnflag = 1,
	    decflag = 1,
            noisy = 1,
	    width = 0,
#ifdef	MF
	    uucp = 1,
#endif	/* MF */
	    locked = 0,
#ifdef	POP
	    nmsgs,
	    nbytes,
	    p = 0,
#endif	/* POP */
	    rpop = 1,
            i,
	    hghnum,
            msgnum;
    char   *cp,
           *maildir,
           *folder = NULL,
	   *form = NULL,
	   *format = NULL,
           *audfile = NULL,
           *from = NULL,
	   *host = NULL,
#ifdef	POP
	   *pass = NULL,
#endif	/* POP */
           *newmail,
            buf[100],
          **ap,
          **argp,
           *nfs,
           *arguments[MAXARGS];
    char *user = NULL;
    struct msgs *mp;
    struct stat st,
                s1;
    FILE *in, *aud = NULL;
#ifdef	MHE
    FILE *mhe = NULL;
#endif	/* MHE */
#ifdef HESIOD
    struct hes_postoffice *po;
    char *tmphost;
#endif

#ifdef LOCALE
	setlocale(LC_ALL, "");
#endif
    invo_name = r1bindex (argv[0], '/');
    mts_init (invo_name);

#ifdef	POP
#ifdef HESIOD
    /*
     * Scheme is:
     *        use MAILHOST environment variable if present,
     *  else try Hesiod.
     *  If that fails, use the default (if any)
     *  provided by mtstailor in mts_init()
     */
    if ((tmphost = getenv("MAILHOST")) != NULL)
	pophost = tmphost;
    else if ((po = hes_getmailhost(getusr())) != NULL &&
	    strcmp(po->po_type, "POP") == 0)
	pophost = po->po_host;
#endif /* HESIOD */
    if (pophost && *pophost)
	host = pophost;

    if ((cp = getenv ("MHPOPDEBUG")) && *cp)
	snoop++;
#endif

    if ((cp = m_find (invo_name)) != NULL) {
	ap = brkstring (cp = getcpy (cp), " ", "\n");
	ap = copyip (ap, arguments);
    }
    else
	ap = arguments;
    (void) copyip (argv + 1, ap);
    argp = arguments;

/*  */

    while (cp = *argp++) {
	if (*cp == '-')
	    switch (smatch (++cp, switches)) {
		case AMBIGSW: 
		    ambigsw (cp, switches);
		    done (1);
		case UNKWNSW: 
		    adios (NULLCP, "-%s unknown", cp);
		case HELPSW: 
		    (void) sprintf (buf, "%s [+folder] [switches]", invo_name);
		    help (buf, switches);
		    done (1);

		case AUDSW: 
		    if (!(cp = *argp++) || *cp == '-')
			adios (NULLCP, "missing argument to %s", argp[-2]);
		    audfile = getcpy (m_maildir (cp));
		    continue;
		case NAUDSW: 
		    audfile = NULL;
		    continue;

		case CHGSW: 
		    chgflag++;
		    continue;
		case NCHGSW: 
		    chgflag = 0;
		    continue;

		case TRNCSW: 
		    trnflag++;
		    continue;
		case MSW: 
		    if (!(cp = *argp++) || *cp == '-')
			adios (NULLCP, "missing argument to %s", argp[-2]);
		    from = path (cp, TFILE);/* fall */
		case NTRNCSW: 
		    trnflag = 0;
		    continue;

		case SILSW: 
		    noisy = 0;
		    continue;
		case NSILSW: 
		    noisy++;
		    continue;

		case FORMSW: 
		    if (!(form = *argp++) || *form == '-')
			adios (NULLCP, "missing argument to %s", argp[-2]);
		    format = NULL;
		    continue;
		case FMTSW: 
		    if (!(format = *argp++) || *format == '-')
			adios (NULLCP, "missing argument to %s", argp[-2]);
		    form = NULL;
		    continue;

		case WIDSW: 
		    if (!(cp = *argp++) || *cp == '-')
			adios (NULLCP, "missing argument to %s", argp[-2]);
		    width = atoi (cp);
		    continue;

		case DECRSW:
		    decflag++;
		    continue;
		case NDECRSW:
		    decflag = 0;
		    continue;

		case UUCPSW: 
#ifdef	MF
		    uucp++;
#endif	/* MF */
		    continue;
		case NUUCPSW: 
#ifdef	MF
		    uucp = 0;
#endif	/* MF */
		    continue;

		case HOSTSW:
		    if (!(host = *argp++) || *host == '-')
			adios (NULLCP, "missing argument to %s", argp[-2]);
		    continue;
		case USERSW:
		    if (!(user = *argp++) || *user == '-')
			adios (NULLCP, "missing argument to %s", argp[-2]);
		    continue;
		case PACKSW:
#ifndef	POP
		    if (!(cp = *argp++) || *cp == '-')
			adios (NULLCP, "missing argument to %s", argp[-2]);
#else	/* POP */
		    if (!(file = *argp++) || *file == '-')
			adios (NULLCP, "missing argument to %s", argp[-2]);
#endif	/* POP */
		    continue;
		case NPACKSW:
#ifdef	POP
		    file = NULLCP;
#endif	/* POP */
		    continue;
		case APOPSW:
		    rpop = -1;
		    continue;
		case RPOPSW:
		    rpop = 1;
		    continue;
		case NAPOPSW:
		case NRPOPSW:
		    rpop = 0;
		    continue;
	    }
	if (*cp == '+' || *cp == '@') {
	    if (folder)
		adios (NULLCP, "only one folder at a time!");
	    else
		folder = path (cp + 1, *cp == '+' ? TFOLDER : TSUBCWF);
	}
	else
	    adios (NULLCP, "usage: %s [+folder] [switches]", invo_name);
    }

/*  */

#ifdef MAILGROUP
    return_gid = getegid();	/* Save effective gid, assuming we'll use it */
    setgid(getgid());		/* Turn off extraordinary privileges */
#endif	/* MAILGROUP */

#ifdef	POP
    if (host && !*host)
	host = NULL;
    if (from || !host || rpop <= 0)
	(void) setuid (getuid ());
#endif /* POP */
    if (from) {
	newmail = from;
#ifdef	POP
	host = NULL;
#endif	/* POP */
	if (stat (newmail, &s1) == NOTOK || s1.st_size == 0)
	    adios (NULLCP, "no mail to incorporate");
    }
#ifdef	POP
    else if (host) {
	if (user == NULL)
	    user = getusr ();
	if (rpop > 0)
	    pass = getusr ();
	else
	    ruserpass (host, &user, &pass);

	if (pop_init (host, user, pass, snoop, rpop) == NOTOK
		|| pop_stat (&nmsgs, &nbytes) == NOTOK)
	    adios (NULLCP, "%s", response);
	if (rpop > 0)
	    (void) setuid (getuid ());
	if (nmsgs == 0) {
	    (void) pop_quit ();
	    adios (NULLCP, "no mail to incorporate");
	}
    }
#endif	/* POP */
    else {
	if (((newmail = getenv ("MAILDROP")) && *newmail)
		|| ((newmail = m_find ("maildrop")) && *newmail))
	    newmail = m_mailpath (newmail);
	else {
#ifdef	MF
	    if (uucp && umincproc && *umincproc)
		get_uucp_mail ();
#endif	/* MF */
	    newmail = concat (MAILDIR, "/", MAILFIL, NULLCP);
	}
	if (stat (newmail, &s1) == NOTOK || s1.st_size == 0)
	    adios (NULLCP, "no mail to incorporate");
    }

#ifdef	POP
    if (host && file)
	goto go_to_it;
#endif	/* POP */
    if (!m_find ("path"))
	free (path ("./", TFOLDER));
    if (!folder && !(folder = m_find (inbox)))
	folder = defalt;
    maildir = m_maildir (folder);

    if (stat (maildir, &st) == NOTOK) {
	if (errno != ENOENT)
	    adios (maildir, "error on folder");
	cp = concat ("Create folder \"", maildir, "\"? ", NULLCP);
	if (noisy && !getanswer (cp))
	    done (1);
	free (cp);
	if (!makedir (maildir))
	    adios (NULLCP, "unable to create folder %s", maildir);
    }

    if (chdir (maildir) == NOTOK)
	adios (maildir, "unable to change directory to");
    if (!(mp = m_gmsg (folder)))
	adios (NULLCP, "unable to read folder %s", folder);

/*  */

#ifdef	POP
go_to_it: ;
    if (host == NULL)
#endif	/* POP */
    if (access (newmail, 02) == NOTOK) {
	trnflag = 0;
	if ((in = fopen (newmail, "r")) == NULL)
	    adios (newmail, "unable to read");
    }
    else {
	locked++;
	if (trnflag) {
	    (void) signal (SIGHUP, SIG_IGN);
	    (void) signal (SIGINT, SIG_IGN);
	    (void) signal (SIGQUIT, SIG_IGN);
	    (void) signal (SIGTERM, SIG_IGN);
	}