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syslog portability for HP-UX; fix typo for OSF/1 pid file
[unix-history] / usr / src / usr.sbin / sendmail / src / conf.c
/*
* Copyright (c) 1983 Eric P. Allman
* Copyright (c) 1988, 1993
* The Regents of the University of California. All rights reserved.
*
* %sccs.include.redist.c%
*/
#ifndef lint
static char sccsid[] = "@(#)conf.c 8.61 (Berkeley) %G%";
#endif /* not lint */
# include "sendmail.h"
# include "pathnames.h"
# include <sys/ioctl.h>
# include <sys/param.h>
# include <netdb.h>
# include <pwd.h>
/*
** CONF.C -- Sendmail Configuration Tables.
**
** Defines the configuration of this installation.
**
** Configuration Variables:
** HdrInfo -- a table describing well-known header fields.
** Each entry has the field name and some flags,
** which are described in sendmail.h.
**
** Notes:
** I have tried to put almost all the reasonable
** configuration information into the configuration
** file read at runtime. My intent is that anything
** here is a function of the version of UNIX you
** are running, or is really static -- for example
** the headers are a superset of widely used
** protocols. If you find yourself playing with
** this file too much, you may be making a mistake!
*/
\f/*
** Header info table
** Final (null) entry contains the flags used for any other field.
**
** Not all of these are actually handled specially by sendmail
** at this time. They are included as placeholders, to let
** you know that "someday" I intend to have sendmail do
** something with them.
*/
struct hdrinfo HdrInfo[] =
{
/* originator fields, most to least significant */
"resent-sender", H_FROM|H_RESENT,
"resent-from", H_FROM|H_RESENT,
"resent-reply-to", H_FROM|H_RESENT,
"sender", H_FROM,
"from", H_FROM,
"reply-to", H_FROM,
"full-name", H_ACHECK,
"return-receipt-to", H_FROM|H_RECEIPTTO,
"errors-to", H_FROM|H_ERRORSTO,
/* destination fields */
"to", H_RCPT,
"resent-to", H_RCPT|H_RESENT,
"cc", H_RCPT,
"resent-cc", H_RCPT|H_RESENT,
"bcc", H_RCPT|H_ACHECK,
"resent-bcc", H_RCPT|H_ACHECK|H_RESENT,
"apparently-to", H_RCPT,
/* message identification and control */
"message-id", 0,
"resent-message-id", H_RESENT,
"message", H_EOH,
"text", H_EOH,
/* date fields */
"date", 0,
"resent-date", H_RESENT,
/* trace fields */
"received", H_TRACE|H_FORCE,
"x400-received", H_TRACE|H_FORCE,
"via", H_TRACE|H_FORCE,
"mail-from", H_TRACE|H_FORCE,
/* miscellaneous fields */
"comments", H_FORCE,
"return-path", H_FORCE|H_ACHECK,
NULL, 0,
};
/*
** Location of system files/databases/etc.
*/
char *PidFile = _PATH_SENDMAILPID; /* stores daemon proc id */
/*
** Privacy values
*/
struct prival PrivacyValues[] =
{
"public", PRIV_PUBLIC,
"needmailhelo", PRIV_NEEDMAILHELO,
"needexpnhelo", PRIV_NEEDEXPNHELO,
"needvrfyhelo", PRIV_NEEDVRFYHELO,
"noexpn", PRIV_NOEXPN,
"novrfy", PRIV_NOVRFY,
"restrictmailq", PRIV_RESTRICTMAILQ,
"restrictqrun", PRIV_RESTRICTQRUN,
"authwarnings", PRIV_AUTHWARNINGS,
"goaway", PRIV_GOAWAY,
NULL, 0,
};
/*
** Miscellaneous stuff.
*/
int DtableSize = 50; /* max open files; reset in 4.2bsd */
/*
** Following should be config parameters (and probably will be in
** future releases). In the meantime, setting these is considered
** unsupported, and is intentionally undocumented.
*/
#ifdef BROKENSMTPPEERS
bool BrokenSmtpPeers = TRUE; /* set if you have broken SMTP peers */
#else
bool BrokenSmtpPeers = FALSE; /* set if you have broken SMTP peers */
#endif
#ifdef NOLOOPBACKCHECK
bool CheckLoopBack = FALSE; /* set to check HELO loopback */
#else
bool CheckLoopBack = TRUE; /* set to check HELO loopback */
#endif
\f/*
** SETDEFAULTS -- set default values
**
** Because of the way freezing is done, these must be initialized
** using direct code.
**
** Parameters:
** e -- the default envelope.
**
** Returns:
** none.
**
** Side Effects:
** Initializes a bunch of global variables to their
** default values.
*/
#define DAYS * 24 * 60 * 60
setdefaults(e)
register ENVELOPE *e;
{
SpaceSub = ' '; /* option B */
QueueLA = 8; /* option x */
RefuseLA = 12; /* option X */
WkRecipFact = 30000L; /* option y */
WkClassFact = 1800L; /* option z */
WkTimeFact = 90000L; /* option Z */
QueueFactor = WkRecipFact * 20; /* option q */
FileMode = (RealUid != geteuid()) ? 0644 : 0600;
/* option F */
DefUid = 1; /* option u */
DefGid = 1; /* option g */
CheckpointInterval = 10; /* option C */
MaxHopCount = 25; /* option h */
e->e_sendmode = SM_FORK; /* option d */
e->e_errormode = EM_PRINT; /* option e */
SevenBit = FALSE; /* option 7 */
MaxMciCache = 1; /* option k */
MciCacheTimeout = 300; /* option K */
LogLevel = 9; /* option L */
settimeouts(NULL); /* option r */
TimeOuts.to_q_return = 5 DAYS; /* option T */
TimeOuts.to_q_warning = 0; /* option T */
PrivacyFlags = 0; /* option p */
setdefuser();
setupmaps();
setupmailers();
}
/*
** SETDEFUSER -- set/reset DefUser using DefUid (for initgroups())
*/
setdefuser()
{
struct passwd *defpwent;
static char defuserbuf[40];
DefUser = defuserbuf;
if ((defpwent = getpwuid(DefUid)) != NULL)
strcpy(defuserbuf, defpwent->pw_name);
else
strcpy(defuserbuf, "nobody");
}
\f/*
** HOST_MAP_INIT -- initialize host class structures
*/
bool
host_map_init(map, args)
MAP *map;
char *args;
{
register char *p = args;
for (;;)
{
while (isascii(*p) && isspace(*p))
p++;
if (*p != '-')
break;
switch (*++p)
{
case 'a':
map->map_app = ++p;
break;
}
while (*p != '\0' && !(isascii(*p) && isspace(*p)))
p++;
if (*p != '\0')
*p++ = '\0';
}
if (map->map_app != NULL)
map->map_app = newstr(map->map_app);
return TRUE;
}
\f/*
** SETUPMAILERS -- initialize default mailers
*/
setupmailers()
{
char buf[100];
strcpy(buf, "prog, P=/bin/sh, F=lsD, A=sh -c $u");
makemailer(buf);
strcpy(buf, "*file*, P=/dev/null, F=lsDFMPEu, A=FILE");
makemailer(buf);
strcpy(buf, "*include*, P=/dev/null, F=su, A=INCLUDE");
makemailer(buf);
}
\f/*
** SETUPMAPS -- set up map classes
*/
#define MAPDEF(name, ext, flags, parse, open, close, lookup, store) \
{ \
extern bool parse __P((MAP *, char *)); \
extern bool open __P((MAP *, int)); \
extern void close __P((MAP *)); \
extern char *lookup __P((MAP *, char *, char **, int *)); \
extern void store __P((MAP *, char *, char *)); \
s = stab(name, ST_MAPCLASS, ST_ENTER); \
s->s_mapclass.map_cname = name; \
s->s_mapclass.map_ext = ext; \
s->s_mapclass.map_cflags = flags; \
s->s_mapclass.map_parse = parse; \
s->s_mapclass.map_open = open; \
s->s_mapclass.map_close = close; \
s->s_mapclass.map_lookup = lookup; \
s->s_mapclass.map_store = store; \
}
setupmaps()
{
register STAB *s;
#ifdef NEWDB
MAPDEF("hash", ".db", MCF_ALIASOK|MCF_REBUILDABLE,
map_parseargs, hash_map_open, db_map_close,
db_map_lookup, db_map_store);
MAPDEF("btree", ".db", MCF_ALIASOK|MCF_REBUILDABLE,
map_parseargs, bt_map_open, db_map_close,
db_map_lookup, db_map_store);
#endif
#ifdef NDBM
MAPDEF("dbm", ".dir", MCF_ALIASOK|MCF_REBUILDABLE,
map_parseargs, ndbm_map_open, ndbm_map_close,
ndbm_map_lookup, ndbm_map_store);
#endif
#ifdef NIS
MAPDEF("nis", NULL, MCF_ALIASOK,
map_parseargs, nis_map_open, nis_map_close,
nis_map_lookup, nis_map_store);
#endif
MAPDEF("stab", NULL, MCF_ALIASOK|MCF_ALIASONLY,
map_parseargs, stab_map_open, stab_map_close,
stab_map_lookup, stab_map_store);
MAPDEF("implicit", NULL, MCF_ALIASOK|MCF_ALIASONLY|MCF_REBUILDABLE,
map_parseargs, impl_map_open, impl_map_close,
impl_map_lookup, impl_map_store);
/* host DNS lookup */
MAPDEF("host", NULL, 0,
host_map_init, null_map_open, null_map_close,
host_map_lookup, null_map_store);
/* dequote map */
MAPDEF("dequote", NULL, 0,
dequote_init, null_map_open, null_map_close,
dequote_map, null_map_store);
#if 0
# ifdef USERDB
/* user database */
MAPDEF("udb", ".db", 0,
udb_map_parse, null_map_open, null_map_close,
udb_map_lookup, null_map_store);
# endif
#endif
}
#undef MAPDEF
\f/*
** USERNAME -- return the user id of the logged in user.
**
** Parameters:
** none.
**
** Returns:
** The login name of the logged in user.
**
** Side Effects:
** none.
**
** Notes:
** The return value is statically allocated.
*/
char *
username()
{
static char *myname = NULL;
extern char *getlogin();
register struct passwd *pw;
/* cache the result */
if (myname == NULL)
{
myname = getlogin();
if (myname == NULL || myname[0] == '\0')
{
pw = getpwuid(RealUid);
if (pw != NULL)
myname = newstr(pw->pw_name);
}
else
{
uid_t uid = RealUid;
myname = newstr(myname);
if ((pw = getpwnam(myname)) == NULL ||
(uid != 0 && uid != pw->pw_uid))
{
pw = getpwuid(uid);
if (pw != NULL)
myname = newstr(pw->pw_name);
}
}
if (myname == NULL || myname[0] == '\0')
{
syserr("554 Who are you?");
myname = "postmaster";
}
}
return (myname);
}
\f/*
** TTYPATH -- Get the path of the user's tty
**
** Returns the pathname of the user's tty. Returns NULL if
** the user is not logged in or if s/he has write permission
** denied.
**
** Parameters:
** none
**
** Returns:
** pathname of the user's tty.
** NULL if not logged in or write permission denied.
**
** Side Effects:
** none.
**
** WARNING:
** Return value is in a local buffer.
**
** Called By:
** savemail
*/
char *
ttypath()
{
struct stat stbuf;
register char *pathn;
extern char *ttyname();
extern char *getlogin();
/* compute the pathname of the controlling tty */
if ((pathn = ttyname(2)) == NULL && (pathn = ttyname(1)) == NULL &&
(pathn = ttyname(0)) == NULL)
{
errno = 0;
return (NULL);
}
/* see if we have write permission */
if (stat(pathn, &stbuf) < 0 || !bitset(02, stbuf.st_mode))
{
errno = 0;
return (NULL);
}
/* see if the user is logged in */
if (getlogin() == NULL)
return (NULL);
/* looks good */
return (pathn);
}
\f/*
** CHECKCOMPAT -- check for From and To person compatible.
**
** This routine can be supplied on a per-installation basis
** to determine whether a person is allowed to send a message.
** This allows restriction of certain types of internet
** forwarding or registration of users.
**
** If the hosts are found to be incompatible, an error
** message should be given using "usrerr" and 0 should
** be returned.
**
** 'NoReturn' can be set to suppress the return-to-sender
** function; this should be done on huge messages.
**
** Parameters:
** to -- the person being sent to.
**
** Returns:
** an exit status
**
** Side Effects:
** none (unless you include the usrerr stuff)
*/
checkcompat(to, e)
register ADDRESS *to;
register ENVELOPE *e;
{
# ifdef lint
if (to == NULL)
to++;
# endif /* lint */
if (tTd(49, 1))
printf("checkcompat(to=%s, from=%s)\n",
to->q_paddr, e->e_from.q_paddr);
# ifdef EXAMPLE_CODE
/* this code is intended as an example only */
register STAB *s;
s = stab("arpa", ST_MAILER, ST_FIND);
if (s != NULL && e->e_from.q_mailer != LocalMailer &&
to->q_mailer == s->s_mailer)
{
usrerr("553 No ARPA mail through this machine: see your system administration");
/* NoReturn = TRUE; to supress return copy */
return (EX_UNAVAILABLE);
}
# endif /* EXAMPLE_CODE */
return (EX_OK);
}
\f/*
** SETSIGNAL -- set a signal handler
**
** This is essentially old BSD "signal(3)".
*/
sigfunc_t
setsignal(sig, handler)
int sig;
sigfunc_t handler;
{
#if defined(SYS5SIGNALS) || defined(BSD4_3) || defined(_AUX_SOURCE)
return signal(sig, handler);
#else
struct sigaction n, o;
bzero(&n, sizeof n);
n.sa_handler = handler;
if (sigaction(sig, &n, &o) < 0)
return SIG_ERR;
return o.sa_handler;
#endif
}
\f/*
** HOLDSIGS -- arrange to hold all signals
**
** Parameters:
** none.
**
** Returns:
** none.
**
** Side Effects:
** Arranges that signals are held.
*/
holdsigs()
{
}
\f/*
** RLSESIGS -- arrange to release all signals
**
** This undoes the effect of holdsigs.
**
** Parameters:
** none.
**
** Returns:
** none.
**
** Side Effects:
** Arranges that signals are released.
*/
rlsesigs()
{
}
\f/*
** INIT_MD -- do machine dependent initializations
**
** Systems that have global modes that should be set should do
** them here rather than in main.
*/
#ifdef _AUX_SOURCE
# include <compat.h>
#endif
init_md(argc, argv)
int argc;
char **argv;
{
#ifdef _AUX_SOURCE
setcompat(getcompat() | COMPAT_BSDPROT);
#endif
}
\f/*
** GETLA -- get the current load average
**
** This code stolen from la.c.
**
** Parameters:
** none.
**
** Returns:
** The current load average as an integer.
**
** Side Effects:
** none.
*/
/* try to guess what style of load average we have */
#define LA_ZERO 1 /* always return load average as zero */
#define LA_INT 2 /* read kmem for avenrun; interpret as long */
#define LA_FLOAT 3 /* read kmem for avenrun; interpret as float */
#define LA_SUBR 4 /* call getloadavg */
#define LA_MACH 5 /* MACH load averages (as on NeXT boxes) */
#define LA_SHORT 6 /* read kmem for avenrun; interpret as short */
/* do guesses based on general OS type */
#ifndef LA_TYPE
# define LA_TYPE LA_ZERO
#endif
#if (LA_TYPE == LA_INT) || (LA_TYPE == LA_FLOAT) || (LA_TYPE == LA_SHORT)
#include <nlist.h>
#ifndef LA_AVENRUN
# ifdef SYSTEM5
# define LA_AVENRUN "avenrun"
# else
# define LA_AVENRUN "_avenrun"
# endif
#endif
/* _PATH_UNIX should be defined in <paths.h> */
#ifndef _PATH_UNIX
# if defined(SYSTEM5)
# define _PATH_UNIX "/unix"
# else
# define _PATH_UNIX "/vmunix"
# endif
#endif
struct nlist Nl[] =
{
{ LA_AVENRUN },
#define X_AVENRUN 0
{ 0 },
};
#ifndef FSHIFT
# if defined(unixpc)
# define FSHIFT 5
# endif
# if defined(__alpha)
# define FSHIFT 10
# endif
# if (LA_TYPE == LA_INT) || (LA_TYPE == LA_SHORT)
# define FSHIFT 8
# endif
#endif
#if ((LA_TYPE == LA_INT) || (LA_TYPE == LA_SHORT)) && !defined(FSCALE)
# define FSCALE (1 << FSHIFT)
#endif
getla()
{
static int kmem = -1;
#if LA_TYPE == LA_INT
long avenrun[3];
#else
# if LA_TYPE == LA_SHORT
short avenrun[3];
# else
double avenrun[3];
# endif
#endif
extern off_t lseek();
extern int errno;
if (kmem < 0)
{
kmem = open("/dev/kmem", 0, 0);
if (kmem < 0)
{
if (tTd(3, 1))
printf("getla: open(/dev/kmem): %s\n",
errstring(errno));
return (-1);
}
(void) fcntl(kmem, F_SETFD, 1);
if (nlist(_PATH_UNIX, Nl) < 0)
{
if (tTd(3, 1))
printf("getla: nlist(%s): %s\n", _PATH_UNIX,
errstring(errno));
return (-1);
}
if (Nl[X_AVENRUN].n_value == 0)
{
if (tTd(3, 1))
printf("getla: nlist(%s, %s) ==> 0\n",
_PATH_UNIX, LA_AVENRUN);
return (-1);
}
}
if (tTd(3, 20))
printf("getla: symbol address = %#x\n", Nl[X_AVENRUN].n_value);
if (lseek(kmem, (off_t) Nl[X_AVENRUN].n_value, 0) == -1 ||
read(kmem, (char *) avenrun, sizeof(avenrun)) < sizeof(avenrun))
{
/* thank you Ian */
if (tTd(3, 1))
printf("getla: lseek or read: %s\n", errstring(errno));
return (-1);
}
#if (LA_TYPE == LA_INT) || (LA_TYPE == LA_SHORT)
if (tTd(3, 5))
{
printf("getla: avenrun = %d", avenrun[0]);
if (tTd(3, 15))
printf(", %d, %d", avenrun[1], avenrun[2]);
printf("\n");
}
if (tTd(3, 1))
printf("getla: %d\n", (int) (avenrun[0] + FSCALE/2) >> FSHIFT);
return ((int) (avenrun[0] + FSCALE/2) >> FSHIFT);
#else
if (tTd(3, 5))
{
printf("getla: avenrun = %g", avenrun[0]);
if (tTd(3, 15))
printf(", %g, %g", avenrun[1], avenrun[2]);
printf("\n");
}
if (tTd(3, 1))
printf("getla: %d\n", (int) (avenrun[0] +0.5));
return ((int) (avenrun[0] + 0.5));
#endif
}
#else
#if LA_TYPE == LA_SUBR
#ifdef DGUX
#include <sys/dg_sys_info.h>
int getla()
{
struct dg_sys_info_load_info load_info;
dg_sys_info((long *)&load_info,
DG_SYS_INFO_LOAD_INFO_TYPE, DG_SYS_INFO_LOAD_VERSION_0);
return((int) (load_info.one_minute + 0.5));
}
#else
getla()
{
double avenrun[3];
if (getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0])) < 0)
{
if (tTd(3, 1))
perror("getla: getloadavg failed:");
return (-1);
}
if (tTd(3, 1))
printf("getla: %d\n", (int) (avenrun[0] +0.5));
return ((int) (avenrun[0] + 0.5));
}
#endif /* DGUX */
#else
#if LA_TYPE == LA_MACH
/*
** This has been tested on NEXTSTEP release 2.1/3.X.
*/
#if defined(NX_CURRENT_COMPILER_RELEASE) && NX_CURRENT_COMPILER_RELEASE > NX_COMPILER_RELEASE_3_0
# include <mach/mach.h>
#else
# include <mach.h>
#endif
getla()
{
processor_set_t default_set;
kern_return_t error;
unsigned int info_count;
struct processor_set_basic_info info;
host_t host;
error = processor_set_default(host_self(), &default_set);
if (error != KERN_SUCCESS)
return -1;
info_count = PROCESSOR_SET_BASIC_INFO_COUNT;
if (processor_set_info(default_set, PROCESSOR_SET_BASIC_INFO,
&host, (processor_set_info_t)&info,
&info_count) != KERN_SUCCESS)
{
return -1;
}
return (int) (info.load_average + (LOAD_SCALE / 2)) / LOAD_SCALE;
}
#else
getla()
{
if (tTd(3, 1))
printf("getla: ZERO\n");
return (0);
}
#endif
#endif
#endif
\f/*
** SHOULDQUEUE -- should this message be queued or sent?
**
** Compares the message cost to the load average to decide.
**
** Parameters:
** pri -- the priority of the message in question.
** ctime -- the message creation time.
**
** Returns:
** TRUE -- if this message should be queued up for the
** time being.
** FALSE -- if the load is low enough to send this message.
**
** Side Effects:
** none.
*/
bool
shouldqueue(pri, ctime)
long pri;
time_t ctime;
{
if (CurrentLA < QueueLA)
return (FALSE);
if (CurrentLA >= RefuseLA)
return (TRUE);
return (pri > (QueueFactor / (CurrentLA - QueueLA + 1)));
}
\f/*
** REFUSECONNECTIONS -- decide if connections should be refused
**
** Parameters:
** none.
**
** Returns:
** TRUE if incoming SMTP connections should be refused
** (for now).
** FALSE if we should accept new work.
**
** Side Effects:
** none.
*/
bool
refuseconnections()
{
#ifdef XLA
if (!xla_smtp_ok())
return TRUE;
#endif
/* this is probably too simplistic */
return (CurrentLA >= RefuseLA);
}
\f/*
** SETPROCTITLE -- set process title for ps
**
** Parameters:
** fmt -- a printf style format string. If NULL, the first
** parameter is a literal proctitle previously
** returned by getproctitle.
** va_alist -- possible parameters to fmt.
**
** Returns:
** none.
**
** Side Effects:
** Clobbers argv of our main procedure so ps(1) will
** display the title.
*/
#ifdef SETPROCTITLE
# ifdef __hpux
# include <sys/pstat.h>
# endif
# ifdef BSD4_4
# include <machine/vmparam.h>
# include <sys/exec.h>
# ifdef __bsdi__
# undef PS_STRINGS /* BSDI 1.0 doesn't do PS_STRINGS as we expect */
# define PROCTITLEPAD '\0'
# endif
# ifdef PS_STRINGS
# define SETPROC_STATIC static
# endif
# endif
# ifndef SETPROC_STATIC
# define SETPROC_STATIC
# endif
#endif
#ifndef PROCTITLEPAD
# define PROCTITLEPAD ' '
#endif
char ProcTitleBuf[MAXLINE];
/*VARARGS1*/
#ifdef __STDC__
setproctitle(char *fmt, ...)
#else
setproctitle(fmt, va_alist)
char *fmt;
va_dcl
#endif
{
# ifdef SETPROCTITLE
register char *p;
register int i;
VA_LOCAL_DECL
# ifdef __hpux
union pstun pst;
# endif
extern char **Argv;
extern char *LastArgv;
VA_START(fmt);
if (fmt == NULL)
{
/* restore old proctitle */
(void) strcpy(ProcTitleBuf, va_arg(ap, char *));
}
else
{
p = ProcTitleBuf;
/* print sendmail: heading for grep */
(void) strcpy(p, "sendmail: ");
p += strlen(p);
/* print the argument string */
(void) vsprintf(p, fmt, ap);
}
VA_END;
i = strlen(ProcTitleBuf);
if (i > LastArgv - Argv[0] - 2)
{
i = LastArgv - Argv[0] - 2;
ProcTitleBuf[i] = '\0';
}
(void) strcpy(Argv[0], ProcTitleBuf);
p = &Argv[0][i];
while (p < LastArgv)
*p++ = PROCTITLEPAD;
# endif
# endif
# endif /* SETPROCTITLE */
}
\f/*
** REAPCHILD -- pick up the body of my child, lest it become a zombie
**
** Parameters:
** none.
**
** Returns:
** none.
**
** Side Effects:
** Picks up extant zombies.
*/
void
reapchild()
{
int olderrno = errno;
# ifdef HASWAITPID
auto int status;
int count;
int pid;
count = 0;
while ((pid = waitpid(-1, &status, WNOHANG)) > 0)
{
if (count++ > 1000)
{
syslog(LOG_ALERT, "reapchild: waitpid loop: pid=%d, status=%x",
pid, status);
break;
}
}
# else
# ifdef WNOHANG
union wait status;
while (wait3(&status, WNOHANG, (struct rusage *) NULL) > 0)
continue;
# else /* WNOHANG */
auto int status;
while (wait(&status) > 0)
continue;
# endif /* WNOHANG */
# endif
# ifdef SYS5SIGNALS
(void) setsignal(SIGCHLD, reapchild);
# endif
errno = olderrno;
}
\f/*
** UNSETENV -- remove a variable from the environment
**
** Not needed on newer systems.
**
** Parameters:
** name -- the string name of the environment variable to be
** deleted from the current environment.
**
** Returns:
** none.
**
** Globals:
** environ -- a pointer to the current environment.
**
** Side Effects:
** Modifies environ.
*/
#ifndef HASUNSETENV
void
unsetenv(name)
char *name;
{
extern char **environ;
register char **pp;
int len = strlen(name);
for (pp = environ; *pp != NULL; pp++)
{
if (strncmp(name, *pp, len) == 0 &&
((*pp)[len] == '=' || (*pp)[len] == '\0'))
break;
}
for (; *pp != NULL; pp++)
*pp = pp[1];
}
#endif
\f/*
** GETDTABLESIZE -- return number of file descriptors
**
** Only on non-BSD systems
**
** Parameters:
** none
**
** Returns:
** size of file descriptor table
**
** Side Effects:
** none
*/
#ifdef SOLARIS
# include <sys/resource.h>
#endif
int
getdtsize()
{
#ifdef RLIMIT_NOFILE
struct rlimit rl;
if (getrlimit(RLIMIT_NOFILE, &rl) >= 0)
return rl.rlim_cur;
#endif
# ifdef HASGETDTABLESIZE
return getdtablesize();
# else
# ifdef _SC_OPEN_MAX
return sysconf(_SC_OPEN_MAX);
# else
return NOFILE;
# endif
# endif
}
\f/*
** UNAME -- get the UUCP name of this system.
*/
#ifndef HASUNAME
int
uname(name)
struct utsname *name;
{
FILE *file;
char *n;
name->nodename[0] = '\0';
/* try /etc/whoami -- one line with the node name */
if ((file = fopen("/etc/whoami", "r")) != NULL)
{
(void) fgets(name->nodename, NODE_LENGTH + 1, file);
(void) fclose(file);
n = strchr(name->nodename, '\n');
if (n != NULL)
*n = '\0';
if (name->nodename[0] != '\0')
return (0);
}
/* try /usr/include/whoami.h -- has a #define somewhere */
if ((file = fopen("/usr/include/whoami.h", "r")) != NULL)
{
char buf[MAXLINE];
while (fgets(buf, MAXLINE, file) != NULL)
if (sscanf(buf, "#define sysname \"%*[^\"]\"",
NODE_LENGTH, name->nodename) > 0)
break;
(void) fclose(file);
if (name->nodename[0] != '\0')
return (0);
}
#ifdef TRUST_POPEN
/*
** Popen is known to have security holes.
*/
/* try uuname -l to return local name */
if ((file = popen("uuname -l", "r")) != NULL)
{
(void) fgets(name, NODE_LENGTH + 1, file);
(void) pclose(file);
n = strchr(name, '\n');
if (n != NULL)
*n = '\0';
if (name->nodename[0] != '\0')
return (0);
}
#endif
return (-1);
}
#endif /* HASUNAME */
\f/*
** INITGROUPS -- initialize groups
**
** Stub implementation for System V style systems
*/
#ifndef HASINITGROUPS
initgroups(name, basegid)
char *name;
int basegid;
{
return 0;
}
#endif
\f/*
** SETSID -- set session id (for non-POSIX systems)
*/
#ifndef HASSETSID
pid_t
setsid __P ((void))
{
#ifdef TIOCNOTTY
int fd;
fd = open("/dev/tty", 2);
if (fd >= 0)
{
(void) ioctl(fd, (int) TIOCNOTTY, (char *) 0);
(void) close(fd);
}
#endif /* TIOCNOTTY */
# ifdef SYS5SETPGRP
return setpgrp();
# else
return setpgid(0, getpid());
# endif
}
#endif
\f/*
** DGUX_INET_ADDR -- inet_addr for DG/UX
**
** Data General DG/UX version of inet_addr returns a struct in_addr
** instead of a long. This patches things.
*/
#ifdef DGUX
#undef inet_addr
long
dgux_inet_addr(host)
char *host;
{
struct in_addr haddr;
haddr = inet_addr(host);
return haddr.s_addr;
}
#endif
\f/*
** GETOPT -- for old systems or systems with bogus implementations
*/
#ifdef NEEDGETOPT
/*
* Copyright (c) 1985 Regents of the University of California.
* All rights reserved. The Berkeley software License Agreement
* specifies the terms and conditions for redistribution.
*/
/*
** this version hacked to add `atend' flag to allow state machine
** to reset if invoked by the program to scan args for a 2nd time
*/
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)getopt.c 4.3 (Berkeley) 3/9/86";
#endif /* LIBC_SCCS and not lint */
#include <stdio.h>
/*
* get option letter from argument vector
*/
#ifdef _CONVEX_SOURCE
extern int optind, opterr;
#else
int opterr = 1; /* if error message should be printed */
int optind = 1; /* index into parent argv vector */
#endif
int optopt; /* character checked for validity */
char *optarg; /* argument associated with option */
#define BADCH (int)'?'
#define EMSG ""
#define tell(s) if (opterr) {fputs(*nargv,stderr);fputs(s,stderr); \
fputc(optopt,stderr);fputc('\n',stderr);return(BADCH);}
getopt(nargc,nargv,ostr)
int nargc;
char *const *nargv;
const char *ostr;
{
static char *place = EMSG; /* option letter processing */
static char atend = 0;
register char *oli; /* option letter list index */
if (atend) {
atend = 0;
place = EMSG;
}
if(!*place) { /* update scanning pointer */
if (optind >= nargc || *(place = nargv[optind]) != '-' || !*++place) {
atend++;
return(EOF);
}
if (*place == '-') { /* found "--" */
++optind;
atend++;
return(EOF);
}
} /* option letter okay? */
if ((optopt = (int)*place++) == (int)':' || !(oli = strchr(ostr,optopt))) {
if (!*place) ++optind;
tell(": illegal option -- ");
}
if (*++oli != ':') { /* don't need argument */
optarg = NULL;
if (!*place) ++optind;
}
else { /* need an argument */
if (*place) optarg = place; /* no white space */
else if (nargc <= ++optind) { /* no arg */
place = EMSG;
tell(": option requires an argument -- ");
}
else optarg = nargv[optind]; /* white space */
place = EMSG;
++optind;
}
return(optopt); /* dump back option letter */
}
#endif
\f/*
** VFPRINTF, VSPRINTF -- for old 4.3 BSD systems missing a real version
*/
#ifdef NEEDVPRINTF
#define MAXARG 16
vfprintf(fp, fmt, ap)
FILE * fp;
char * fmt;
char ** ap;
{
char * bp[MAXARG];
int i = 0;
while (*ap && i < MAXARG)
bp[i++] = *ap++;
fprintf(fp, fmt, bp[0], bp[1], bp[2], bp[3],
bp[4], bp[5], bp[6], bp[7],
bp[8], bp[9], bp[10], bp[11],
bp[12], bp[13], bp[14], bp[15]);
}
vsprintf(s, fmt, ap)
char * s;
char * fmt;
char ** ap;
{
char * bp[MAXARG];
int i = 0;
while (*ap && i < MAXARG)
bp[i++] = *ap++;
sprintf(s, fmt, bp[0], bp[1], bp[2], bp[3],
bp[4], bp[5], bp[6], bp[7],
bp[8], bp[9], bp[10], bp[11],
bp[12], bp[13], bp[14], bp[15]);
}
#endif
\f/*
** USERSHELLOK -- tell if a user's shell is ok for unrestricted use
**
** Parameters:
** shell -- the user's shell from /etc/passwd
**
** Returns:
** TRUE -- if it is ok to use this for unrestricted access.
** FALSE -- if the shell is restricted.
*/
#ifndef _PATH_SHELLS
# define _PATH_SHELLS "/etc/shells"
#endif
#ifndef _PATH_BSHELL
# define _PATH_BSHELL "/bin/sh"
#endif
#ifndef _PATH_CSHELL
# define _PATH_CSHELL "/bin/csh"
#endif
bool
usershellok(shell)
char *shell;
{
#if HASGETUSERSHELL
register char *p;
extern char *getusershell();
setusershell();
while ((p = getusershell()) != NULL)
if (strcmp(p, shell) == 0 || strcmp(p, "*") == 0)
break;
endusershell();
return p != NULL;
#else
register FILE *shellf;
char buf[MAXLINE];
shellf = fopen(_PATH_SHELLS, "r");
if (shellf == NULL)
{
/* no /etc/shells; see if it is one of the std shells */
return (strcmp(shell, _PATH_CSHELL) == 0 ||
strcmp(shell, _PATH_BSHELL) == 0);
}
while (fgets(buf, sizeof buf, shellf) != NULL)
{
register char *p, *q;
p = buf;
while (*p != '\0' && *p != '#' && *p != '/')
p++;
if (*p == '#' || *p == '\0')
continue;
q = p;
while (*p != '\0' && *p != '#' && !isspace(*p))
p++;
*p = '\0';
if (strcmp(shell, q) == 0 || strcmp("*", q) == 0)
{
fclose(shellf);
return TRUE;
}
}
fclose(shellf);
return FALSE;
#endif
}
\f/*
** FREESPACE -- see how much free space is on the queue filesystem
**
** Only implemented if you have statfs.
**
** Parameters:
** dir -- the directory in question.
** bsize -- a variable into which the filesystem
** block size is stored.
**
** Returns:
** The number of bytes free on the queue filesystem.
** -1 if the statfs call fails.
**
** Side effects:
** Puts the filesystem block size into bsize.
*/
#ifdef HASSTATFS
# undef HASUSTAT
#endif
#if defined(HASUSTAT)
# include <ustat.h>
#endif
#ifdef HASSTATFS
# if defined(IRIX) || defined(apollo) || defined(_SCO_unix_) || defined(UMAXV) || defined(DGUX) || defined(_AIX3)
# include <sys/statfs.h>
# else
# if (defined(sun) && !defined(BSD)) || defined(__hpux) || defined(_CONVEX_SOURCE) || defined(NeXT) || defined(_AUX_SOURCE) || defined(MACH386)
# include <sys/vfs.h>
# else
# include <sys/mount.h>
# endif
# endif
#endif
long
freespace(dir, bsize)
char *dir;
long *bsize;
{
#if defined(HASSTATFS) || defined(HASUSTAT)
# if defined(HASUSTAT)
struct ustat fs;
struct stat statbuf;
# define FSBLOCKSIZE DEV_BSIZE
# define f_bavail f_tfree
# else
# if defined(ultrix)
struct fs_data fs;
# define f_bavail fd_bfreen
# define FSBLOCKSIZE fs.fd_bsize
# else
struct statfs fs;
# define FSBLOCKSIZE fs.f_bsize
# if defined(_SCO_unix_) || defined(IRIX)
# define f_bavail f_bfree
# endif
# endif
# endif
extern int errno;
# if defined(HASUSTAT)
if (stat(dir, &statbuf) == 0 && ustat(statbuf.st_dev, &fs) == 0)
# else
# if defined(IRIX) || defined(apollo) || defined(UMAXV) || defined(DGUX)
if (statfs(dir, &fs, sizeof fs, 0) == 0)
# else
# if defined(ultrix)
if (statfs(dir, &fs) > 0)
# else
if (statfs(dir, &fs) == 0)
# endif
# endif
# endif
{
if (bsize != NULL)
*bsize = FSBLOCKSIZE;
return (fs.f_bavail);
}
#endif
return (-1);
}
\f/*
** ENOUGHSPACE -- check to see if there is enough free space on the queue fs
**
** Only implemented if you have statfs.
**
** Parameters:
** msize -- the size to check against. If zero, we don't yet
** know how big the message will be, so just check for
** a "reasonable" amount.
**
** Returns:
** TRUE if there is enough space.
** FALSE otherwise.
*/
bool
enoughspace(msize)
long msize;
{
long bfree, bsize;
if (MinBlocksFree <= 0 && msize <= 0)
{
if (tTd(4, 80))
printf("enoughspace: no threshold\n");
return TRUE;
}
if ((bfree = freespace(QueueDir, &bsize)) >= 0)
{
if (tTd(4, 80))
printf("enoughspace: bavail=%ld, need=%ld\n",
bfree, msize);
/* convert msize to block count */
msize = msize / bsize + 1;
if (MinBlocksFree >= 0)
msize += MinBlocksFree;
if (bfree < msize)
{
#ifdef LOG
if (LogLevel > 0)
syslog(LOG_ALERT,
"%s: low on space (have %ld, %s needs %ld in %s)",
CurEnv->e_id, bfree,
CurHostName, msize, QueueDir);
#endif
return FALSE;
}
}
else if (tTd(4, 80))
printf("enoughspace failure: min=%ld, need=%ld: %s\n",
MinBlocksFree, msize, errstring(errno));
return TRUE;
}
\f/*
** TRANSIENTERROR -- tell if an error code indicates a transient failure
**
** This looks at an errno value and tells if this is likely to
** go away if retried later.
**
** Parameters:
** err -- the errno code to classify.
**
** Returns:
** TRUE if this is probably transient.
** FALSE otherwise.
*/
bool
transienterror(err)
int err;
{
switch (err)
{
case EIO: /* I/O error */
case ENXIO: /* Device not configured */
case EAGAIN: /* Resource temporarily unavailable */
case ENOMEM: /* Cannot allocate memory */
case ENODEV: /* Operation not supported by device */
case ENFILE: /* Too many open files in system */
case EMFILE: /* Too many open files */
case ENOSPC: /* No space left on device */
#ifdef ETIMEDOUT
case ETIMEDOUT: /* Connection timed out */
#endif
#ifdef ESTALE
case ESTALE: /* Stale NFS file handle */
#endif
#ifdef ENETDOWN
case ENETDOWN: /* Network is down */
#endif
#ifdef ENETUNREACH
case ENETUNREACH: /* Network is unreachable */
#endif
#ifdef ENETRESET
case ENETRESET: /* Network dropped connection on reset */
#endif
#ifdef ECONNABORTED
case ECONNABORTED: /* Software caused connection abort */
#endif
#ifdef ECONNRESET
case ECONNRESET: /* Connection reset by peer */
#endif
#ifdef ENOBUFS
case ENOBUFS: /* No buffer space available */
#endif
#ifdef ESHUTDOWN
case ESHUTDOWN: /* Can't send after socket shutdown */
#endif
#ifdef ECONNREFUSED
case ECONNREFUSED: /* Connection refused */
#endif
#ifdef EHOSTDOWN
case EHOSTDOWN: /* Host is down */
#endif
#ifdef EHOSTUNREACH
case EHOSTUNREACH: /* No route to host */
#endif
#ifdef EDQUOT
case EDQUOT: /* Disc quota exceeded */
#endif
#ifdef EPROCLIM
case EPROCLIM: /* Too many processes */
#endif
#ifdef EUSERS
case EUSERS: /* Too many users */
#endif
#ifdef EDEADLK
case EDEADLK: /* Resource deadlock avoided */
#endif
#ifdef EISCONN
case EISCONN: /* Socket already connected */
#endif
#ifdef EINPROGRESS
case EINPROGRESS: /* Operation now in progress */
#endif
#ifdef EALREADY
case EALREADY: /* Operation already in progress */
#endif
#ifdef EADDRINUSE
case EADDRINUSE: /* Address already in use */
#endif
#ifdef EADDRNOTAVAIL
case EADDRNOTAVAIL: /* Can't assign requested address */
#endif
#if defined(ENOSR) && (!defined(ENOBUFS) || (ENOBUFS != ENOSR))
case ENOSR: /* Out of streams resources */
#endif
return TRUE;
}
/* nope, must be permanent */
return FALSE;
}
\f/*
** LOCKFILE -- lock a file using flock or (shudder) fcntl locking
**
** Parameters:
** fd -- the file descriptor of the file.
** filename -- the file name (for error messages).
** ext -- the filename extension.
** type -- type of the lock. Bits can be:
** LOCK_EX -- exclusive lock.
** LOCK_NB -- non-blocking.
**
** Returns:
** TRUE if the lock was acquired.
** FALSE otherwise.
*/
bool
lockfile(fd, filename, ext, type)
int fd;
char *filename;
char *ext;
int type;
{
# ifndef HASFLOCK
int action;
struct flock lfd;
if (ext == NULL)
ext = "";
bzero(&lfd, sizeof lfd);
if (bitset(LOCK_UN, type))
lfd.l_type = F_UNLCK;
else if (bitset(LOCK_EX, type))
lfd.l_type = F_WRLCK;
else
lfd.l_type = F_RDLCK;
if (bitset(LOCK_NB, type))
action = F_SETLK;
else
action = F_SETLKW;
if (tTd(55, 60))
printf("lockfile(%s%s, action=%d, type=%d): ",
filename, ext, action, lfd.l_type);
if (fcntl(fd, action, &lfd) >= 0)
{
if (tTd(55, 60))
printf("SUCCESS\n");
return TRUE;
}
if (tTd(55, 60))
printf("(%s) ", errstring(errno));
/*
** On SunOS, if you are testing using -oQ/tmp/mqueue or
** -oA/tmp/aliases or anything like that, and /tmp is mounted
** as type "tmp" (that is, served from swap space), the
** previous fcntl will fail with "Invalid argument" errors.
** Since this is fairly common during testing, we will assume
** that this indicates that the lock is successfully grabbed.
*/
if (errno == EINVAL)
{
if (tTd(55, 60))
printf("SUCCESS\n");
return TRUE;
}
if (!bitset(LOCK_NB, type) || (errno != EACCES && errno != EAGAIN))
{
int omode = -1;
# ifdef F_GETFL
int oerrno = errno;
(void) fcntl(fd, F_GETFL, &omode);
errno = oerrno;
# endif
syserr("cannot lockf(%s%s, fd=%d, type=%o, omode=%o, euid=%d)",
filename, ext, fd, type, omode, geteuid());
}
# else
if (ext == NULL)
ext = "";
if (tTd(55, 60))
printf("lockfile(%s%s, type=%o): ", filename, ext, type);
if (flock(fd, type) >= 0)
{
if (tTd(55, 60))
printf("SUCCESS\n");
return TRUE;
}
if (tTd(55, 60))
printf("(%s) ", errstring(errno));
if (!bitset(LOCK_NB, type) || errno != EWOULDBLOCK)
{
int omode = -1;
# ifdef F_GETFL
int oerrno = errno;
(void) fcntl(fd, F_GETFL, &omode);
errno = oerrno;
# endif
syserr("cannot flock(%s%s, fd=%d, type=%o, omode=%o, euid=%d)",
filename, ext, fd, type, omode, geteuid());
}
# endif
if (tTd(55, 60))
printf("FAIL\n");
return FALSE;
}
\f/*
** GETCFNAME -- return the name of the .cf file.
**
** Some systems (e.g., NeXT) determine this dynamically.
*/
char *
getcfname()
{
if (ConfFile != NULL)
return ConfFile;
#ifdef NETINFO
{
extern char *ni_propval();
char *cflocation;
cflocation = ni_propval("/locations/sendmail", "sendmail.cf");
if (cflocation != NULL)
return cflocation;
}
#endif
return _PATH_SENDMAILCF;
}
\f/*
** SETVENDOR -- process vendor code from V configuration line
**
** Parameters:
** vendor -- string representation of vendor.
**
** Returns:
** TRUE -- if ok.
** FALSE -- if vendor code could not be processed.
**
** Side Effects:
** It is reasonable to set mode flags here to tweak
** processing in other parts of the code if necessary.
** For example, if you are a vendor that uses $%y to
** indicate YP lookups, you could enable that here.
*/
bool
setvendor(vendor)
char *vendor;
{
if (strcasecmp(vendor, "Berkeley") == 0)
return TRUE;
/* add vendor extensions here */
return FALSE;
}
\f/*
** STRTOL -- convert string to long integer
**
** For systems that don't have it in the C library.
*/
#ifdef NEEDSTRTOL
long
strtol(p, ep, b)
char *p;
char **ep;
int b;
{
long l = 0;
char c;
char maxd;
int neg = 1;
maxd = (b > 10) ? '9' : b + '0';
if (p && *p == '-') {
neg = -1;
p++;
}
while (p && (c = *p)) {
if (c >= '0' && c <= maxd) {
l = l*b + *p++ - '0';
continue;
}
if (c >= 'A' && c <= 'Z')
c -= 'A' + 'a';
c = c - 'a' + 10;
if (b > c) {
l = l*b + c;
p++;
continue;
}
break;
}
l *= neg;
if (ep)
*ep = p;
return l;
}
#endif
\f/*
** SOLARIS_GETHOSTBY{NAME,ADDR} -- compatibility routines for gethostbyXXX
**
** Solaris versions prior through 2.3 don't properly deliver a
** canonical h_name field. This tries to work around it.
*/
#ifdef SOLARIS
struct hostent *
solaris_gethostbyname(name)
const char *name;
{
# ifdef SOLARIS_2_3
static struct hostent hp;
static char buf[1000];
extern struct hostent *_switch_gethostbyname_r();
return _switch_gethostbyname_r(name, &hp, buf, sizeof(buf), &h_errno);
# else
extern struct hostent *__switch_gethostbyname();
return __switch_gethostbyname(name);
# endif
}
struct hostent *
solaris_gethostbyaddr(addr, len, type)
const char *addr;
int len;
int type;
{
# ifdef SOLARIS_2_3
static struct hostent hp;
static char buf[1000];
extern struct hostent *_switch_gethostbyaddr_r();
return _switch_gethostbyaddr_r(addr, len, type, &hp, buf, sizeof(buf), &h_errno);
# else
extern struct hostent *__switch_gethostbyaddr();
return __switch_gethostbyaddr(addr, len, type);
# endif
}
#endif
\f/*
** NI_PROPVAL -- netinfo property value lookup routine
**
** Parameters:
** directory -- the Netinfo directory name.
** propname -- the Netinfo property name.
**
** Returns:
** NULL -- if:
** 1. the directory is not found
** 2. the property name is not found
** 3. the property contains multiple values
** 4. some error occured
** else -- the location of the config file.
**
** Notes:
** Caller should free the return value of ni_proval
*/
#ifdef NETINFO
# include <netinfo/ni.h>
# define LOCAL_NETINFO_DOMAIN "."
# define PARENT_NETINFO_DOMAIN ".."
# define MAX_NI_LEVELS 256
char *
ni_propval(directory, propname)
char *directory;
char *propname;
{
char *propval;
int i;
void *ni = NULL;
void *lastni = NULL;
ni_status nis;
ni_id nid;
ni_namelist ninl;
/*
** If the passed directory and property name are found
** in one of netinfo domains we need to search (starting
** from the local domain moving all the way back to the
** root domain) set propval to the property's value
** and return it.
*/
for (i = 0; i < MAX_NI_LEVELS; ++i)
{
if (i == 0)
{
nis = ni_open(NULL, LOCAL_NETINFO_DOMAIN, &ni);
}
else
{
if (lastni != NULL)
ni_free(lastni);
lastni = ni;
nis = ni_open(lastni, PARENT_NETINFO_DOMAIN, &ni);
}
/*
** Don't bother if we didn't get a handle on a
** proper domain. This is not necessarily an error.
** We would get a positive ni_status if, for instance
** we never found the directory or property and tried
** to open the parent of the root domain!
*/
if (nis != 0)
break;
/*
** Find the path to the server information.
*/
if (ni_pathsearch(ni, &nid, directory) != 0)
continue;
/*
** Find "host" information.
*/
if (ni_lookupprop(ni, &nid, propname, &ninl) != 0)
continue;
/*
** If there's only one name in
** the list, assume we've got
** what we want.
*/
if (ninl.ni_namelist_len == 1)
{
propval = ni_name_dup(ninl.ni_namelist_val[0]);
break;
}
}
/*
** Clean up.
*/
if (ni != NULL)
ni_free(ni);
if (lastni != NULL && ni != lastni)
ni_free(lastni);
return propval;
}
#endif /* NETINFO */
\f/*
** HARD_SYSLOG -- call syslog repeatedly until it works
**
** Needed on HP-UX, which apparently doesn't guarantee that
** syslog succeeds during interrupt handlers.
*/
#ifdef __hpux
# define MAXSYSLOGTRIES 100
# undef syslog
# ifdef __STDC__
hard_syslog(int pri, char *msg, ...)
# else
hard_syslog(pri, msg, va_alist)
int pri;
char *msg;
va_dcl
# endif
{
int i;
char buf[SYSLOG_BUFSIZE * 2];
VA_LOCAL_DECL;
VA_START(msg);
vsprintf(buf, msg, ap);
VA_END;
for (i = MAXSYSLOGTRIES; --i >= 0 && syslog(pri, "%s", buf) < 0; )
continue;
}
#endif
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.