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os_sv4.c
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1994-01-09
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22KB
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809 lines
/*
* Program: Operating-system dependent routines -- SVR4 version
*
* Author: Mark Crispin
* Networks and Distributed Computing
* Computing & Communications
* University of Washington
* Administration Building, AG-44
* Seattle, WA 98195
* Internet: MRC@CAC.Washington.EDU
*
* Date: 10 April 1992
* Last Edited: 3 October 1993
*
* Copyright 1993 by the University of Washington
*
* Permission to use, copy, modify, and distribute this software and its
* documentation for any purpose and without fee is hereby granted, provided
* that the above copyright notice appears in all copies and that both the
* above copyright notice and this permission notice appear in supporting
* documentation, and that the name of the University of Washington not be
* used in advertising or publicity pertaining to distribution of the software
* without specific, written prior permission. This software is made
* available "as is", and
* THE UNIVERSITY OF WASHINGTON DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED,
* WITH REGARD TO THIS SOFTWARE, INCLUDING WITHOUT LIMITATION ALL IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, AND IN
* NO EVENT SHALL THE UNIVERSITY OF WASHINGTON BE LIABLE FOR ANY SPECIAL,
* INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, TORT
* (INCLUDING NEGLIGENCE) OR STRICT LIABILITY, ARISING OUT OF OR IN CONNECTION
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
*/
/* TCP input buffer */
#define BUFLEN 8192
/* TCP I/O stream (must be before osdep.h is included) */
#define TCPSTREAM struct tcp_stream
TCPSTREAM {
char *host; /* host name */
char *localhost; /* local host name */
int tcpsi; /* input socket */
int tcpso; /* output socket */
int ictr; /* input counter */
char *iptr; /* input pointer */
char ibuf[BUFLEN]; /* input buffer */
};
#include "osdep.h"
#include <ctype.h>
#include <sys/tiuser.h>
#include <sys/stropts.h>
#include <sys/select.h>
#include <netinet/in.h>
#include <netdb.h>
#include <ctype.h>
#include <regexpr.h>
#include <errno.h>
#include <pwd.h>
#include <shadow.h>
#include <syslog.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include "mail.h"
#include "misc.h"
extern int sys_nerr;
extern char *sys_errlist[];
#define toint(c) ((c)-'0')
#define isodigit(c) (((unsigned)(c)>=060)&((unsigned)(c)<=067))
/* Write current time in RFC 822 format
* Accepts: destination string
*/
char *days[] = {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};
void rfc822_date (date)
char *date;
{
int zone,dstnow;
struct tm *t;
time_t time_sec = time (0);
t = localtime (&time_sec); /* convert to individual items */
tzset (); /* initialize timezone/daylight variables */
/* see if it is DST now */
dstnow = daylight && t->tm_isdst;
/* get timezone value */
zone = - (dstnow ? altzone : timezone) / 60;
/* and output it */
sprintf (date,"%s, %d %s %d %02d:%02d:%02d %+03d%02d (%s)",
days[t->tm_wday],t->tm_mday,months[t->tm_mon],t->tm_year+1900,
t->tm_hour,t->tm_min,t->tm_sec,zone/60,abs (zone) % 60,
tzname[dstnow]);
}
/* Get a block of free storage
* Accepts: size of desired block
* Returns: free storage block
*/
void *fs_get (size)
size_t size;
{
void *block = malloc (size);
if (!block) fatal ("Out of free storage");
return (block);
}
/* Resize a block of free storage
* Accepts: ** pointer to current block
* new size
*/
void fs_resize (block,size)
void **block;
size_t size;
{
if (!(*block = realloc (*block,size))) fatal ("Can't resize free storage");
}
/* Return a block of free storage
* Accepts: ** pointer to free storage block
*/
void fs_give (block)
void **block;
{
free (*block);
*block = NIL;
}
/* Report a fatal error
* Accepts: string to output
*/
void fatal (string)
char *string;
{
mm_fatal (string); /* output the string */
syslog (LOG_ALERT,"IMAP C-Client crash: %s",string);
abort (); /* die horribly */
}
/* Copy string with CRLF newlines
* Accepts: destination string
* pointer to size of destination string
* source string
* length of source string
* Returns: length of copied string
*/
unsigned long strcrlfcpy (dst,dstl,src,srcl)
char **dst;
unsigned long *dstl;
char *src;
unsigned long srcl;
{
long i,j;
char *d = src;
/* count number of LF's in source string(s) */
for (i = srcl,j = 0; j < srcl; j++) if (*d++ == '\012') i++;
if (i > *dstl) { /* resize if not enough space */
fs_give ((void **) dst); /* fs_resize does an unnecessary copy */
*dst = (char *) fs_get ((*dstl = i) + 1);
}
d = *dst; /* destination string */
/* copy strings, inserting CR's before LF's */
while (srcl--) switch (*src) {
case '\015': /* unlikely carriage return */
*d++ = *src++; /* copy it and any succeeding linefeed */
if (srcl && *src == '\012') {
*d++ = *src++;
srcl--;
}
break;
case '\012': /* line feed? */
*d++ ='\015'; /* yes, prepend a CR, drop into default case */
default: /* ordinary chararacter */
*d++ = *src++; /* just copy character */
break;
}
*d = '\0'; /* tie off destination */
return d - *dst; /* return length */
}
/* Length of string after strcrlflen applied
* Accepts: source string
* Returns: length of string
*/
unsigned long strcrlflen (s)
STRING *s;
{
unsigned long pos = GETPOS (s);
unsigned long i = SIZE (s);
unsigned long j = i;
while (j--) switch (SNX (s)) {/* search for newlines */
case '\015': /* unlikely carriage return */
if (j && (CHR (s) == '\012')) {
SNX (s); /* eat the line feed */
j--;
}
break;
case '\012': /* line feed? */
i++;
default: /* ordinary chararacter */
break;
}
SETPOS (s,pos); /* restore old position */
return i;
}
/* Server log in
* Accepts: user name string
* password string
* optional place to return home directory
* Returns: T if password validated, NIL otherwise
*/
long server_login (user,pass,home,argc,argv)
char *user;
char *pass;
char **home;
int argc;
char *argv[];
{
struct passwd *pw = getpwnam (lcase (user));
struct spwd *sp;
/* no entry for this user or root */
if (!(pw && pw->pw_uid)) return NIL;
/* validate password and password aging */
sp = getspnam (pw->pw_name);
if (strcmp (sp->sp_pwdp, (char *) crypt (pass,sp->sp_pwdp))) return NIL;
else if ((sp->sp_lstchg > 0) && (sp->sp_max > 0) &&
((sp->sp_lstchg + sp->sp_max) < (time (0) / (60*60*24))))
return NIL;
setgid (pw->pw_gid); /* all OK, login in as that user */
initgroups (user,pw->pw_gid); /* initialize groups */
setuid (pw->pw_uid);
/* note home directory */
if (home) *home = cpystr (pw->pw_dir);
return T;
}
/* Return my user name
* Returns: my user name
*/
char *myuname = NIL;
char *myusername ()
{
return myuname ? myuname : (myuname = cpystr(getpwuid(geteuid ())->pw_name));
}
/* Return my home directory name
* Returns: my home directory name
*/
char *hdname = NIL;
char *myhomedir ()
{
return hdname ? hdname : (hdname = cpystr (getpwuid (geteuid ())->pw_dir));
}
/* Build status lock file name
* Accepts: scratch buffer
* file name
* Returns: name of file to lock
*/
char *lockname (tmp,fname)
char *tmp;
char *fname;
{
int i;
sprintf (tmp,"/tmp/.%s",fname);
for (i = 6; i < strlen (tmp); ++i) if (tmp[i] == '/') tmp[i] = '\\';
return tmp; /* note name for later */
}
/* TCP/IP open
* Accepts: host name
* contact port number
* Returns: TCP/IP stream if success else NIL
*/
TCPSTREAM *tcp_open (host,port)
char *host;
int port;
{
TCPSTREAM *stream = NIL;
int sock;
char *s;
struct sockaddr_in sin;
struct hostent *host_name;
char hostname[MAILTMPLEN];
char tmp[MAILTMPLEN];
extern int t_errno;
extern char *t_errlist[];
struct t_call *sndcall;
/* The domain literal form is used (rather than simply the dotted decimal
as with other Unix programs) because it has to be a valid "host name"
in mailsystem terminology. */
/* look like domain literal? */
if (host[0] == '[' && host[(strlen (host))-1] == ']') {
strcpy (hostname,host+1); /* yes, copy number part */
hostname[(strlen (hostname))-1] = '\0';
if ((sin.sin_addr.s_addr = inet_addr (hostname)) != -1) {
sin.sin_family = AF_INET; /* family is always Internet */
strcpy (hostname,host); /* hostname is user's argument */
}
else {
sprintf (tmp,"Bad format domain-literal: %.80s",host);
mm_log (tmp,ERROR);
return NIL;
}
}
else { /* lookup host name, note that brain-dead Unix
requires lowercase! */
strcpy (hostname,host); /* in case host is in write-protected memory */
if ((host_name = gethostbyname (lcase (hostname)))) {
/* copy address type */
sin.sin_family = host_name->h_addrtype;
/* copy host name */
strcpy (hostname,host_name->h_name);
/* copy host addresses */
memcpy (&sin.sin_addr,host_name->h_addr,host_name->h_length);
}
else {
sprintf (tmp,"No such host as %.80s",host);
mm_log (tmp,ERROR);
return NIL;
}
}
/* copy port number in network format */
if (!(sin.sin_port = htons (port))) fatal ("Bad port argument to tcp_open");
/* get a TCP stream */
t_errno = 0;
if (((sock = t_open ("/dev/tcp", O_RDWR, 0)) < 0) ||
(t_bind (sock, 0, 0) < 0) ||
((sndcall = (struct t_call *) t_alloc (sock, T_CALL, T_ADDR)) == 0))
{
sprintf (tmp,"Unable to create TCP socket: %s",t_errlist[t_errno]);
mm_log (tmp,ERROR);
return NIL;
}
/* connect to address. */
sndcall->addr.len = sndcall->addr.maxlen = sizeof (sin);
sndcall->addr.buf = (char *) &sin;
sndcall->opt.len = 0;
sndcall->udata.len = 0;
if (t_connect (sock, sndcall, 0) < 0) {
sprintf (tmp,"Can't connect to %.80s,%d: %s",hostname,port,
t_errlist[t_errno]);
mm_log (tmp,ERROR);
return NIL;
}
/* push streams module for read()/write(). */
if (ioctl (sock, I_PUSH, "tirdwr") < 0) {
sprintf (tmp,"Unable to create TCP socket: %s",t_errlist[t_errno]);
mm_log (tmp,ERROR);
return NIL;
}
/* create TCP/IP stream */
stream = (TCPSTREAM *) fs_get (sizeof (TCPSTREAM));
/* copy official host name */
stream->host = cpystr (hostname);
/* get local name */
gethostname (tmp,MAILTMPLEN-1);
stream->localhost = cpystr ((host_name = gethostbyname (tmp)) ?
host_name->h_name : tmp);
/* init sockets */
stream->tcpsi = stream->tcpso = sock;
stream->ictr = 0; /* init input counter */
return stream; /* return success */
}
/* TCP/IP authenticated open
* Accepts: host name
* service name
* Returns: TCP/IP stream if success else NIL
*/
TCPSTREAM *tcp_aopen (host,service)
char *host;
char *service;
{
TCPSTREAM *stream = NIL;
struct hostent *host_name;
char hostname[MAILTMPLEN];
int i;
int pipei[2],pipeo[2];
/* The domain literal form is used (rather than simply the dotted decimal
as with other Unix programs) because it has to be a valid "host name"
in mailsystem terminology. */
/* look like domain literal? */
if (host[0] == '[' && host[i = (strlen (host))-1] == ']') {
strcpy (hostname,host+1); /* yes, copy without brackets */
hostname[i-1] = '\0';
}
/* note that Unix requires lowercase! */
else if (host_name = gethostbyname (lcase (strcpy (hostname,host))))
strcpy (hostname,host_name->h_name);
/* make command pipes */
if (pipe (pipei) < 0) return NIL;
if (pipe (pipeo) < 0) {
close (pipei[0]); close (pipei[1]);
return NIL;
}
if ((i = fork ()) < 0) { /* make inferior process */
close (pipei[0]); close (pipei[1]);
close (pipeo[0]); close (pipeo[1]);
return NIL;
}
if (i) { /* parent? */
close (pipei[1]); /* close child's side of the pipes */
close (pipeo[0]);
}
else { /* child */
dup2 (pipei[1],1); /* parent's input is my output */
dup2 (pipei[1],2); /* parent's input is my error output too */
close (pipei[0]); close (pipei[1]);
dup2 (pipeo[0],0); /* parent's output is my input */
close (pipeo[0]); close (pipeo[1]);
/* now run it */
execl (RSHPATH,RSH,hostname,"exec",service,0);
_exit (1); /* spazzed */
}
/* create TCP/IP stream */
stream = (TCPSTREAM *) fs_get (sizeof (TCPSTREAM));
/* copy official host name */
stream->host = cpystr (hostname);
/* get local name */
gethostname (hostname,MAILTMPLEN-1);
stream->localhost = cpystr ((host_name = gethostbyname (hostname)) ?
host_name->h_name : hostname);
stream->tcpsi = pipei[0]; /* init sockets */
stream->tcpso = pipeo[1];
stream->ictr = 0; /* init input counter */
return stream; /* return success */
}
/* TCP/IP receive line
* Accepts: TCP/IP stream
* Returns: text line string or NIL if failure
*/
char *tcp_getline (stream)
TCPSTREAM *stream;
{
int n,m;
char *st,*ret,*stp;
char c = '\0';
char d;
/* make sure have data */
if (!tcp_getdata (stream)) return NIL;
st = stream->iptr; /* save start of string */
n = 0; /* init string count */
while (stream->ictr--) { /* look for end of line */
d = *stream->iptr++; /* slurp another character */
if ((c == '\015') && (d == '\012')) {
ret = (char *) fs_get (n--);
memcpy (ret,st,n); /* copy into a free storage string */
ret[n] = '\0'; /* tie off string with null */
return ret;
}
n++; /* count another character searched */
c = d; /* remember previous character */
}
/* copy partial string from buffer */
memcpy ((ret = stp = (char *) fs_get (n)),st,n);
/* get more data from the net */
if (!tcp_getdata (stream)) return NIL;
/* special case of newline broken by buffer */
if ((c == '\015') && (*stream->iptr == '\012')) {
stream->iptr++; /* eat the line feed */
stream->ictr--;
ret[n - 1] = '\0'; /* tie off string with null */
}
/* else recurse to get remainder */
else if (st = tcp_getline (stream)) {
ret = (char *) fs_get (n + 1 + (m = strlen (st)));
memcpy (ret,stp,n); /* copy first part */
memcpy (ret + n,st,m); /* and second part */
fs_give ((void **) &stp); /* flush first part */
fs_give ((void **) &st); /* flush second part */
ret[n + m] = '\0'; /* tie off string with null */
}
return ret;
}
/* TCP/IP receive buffer
* Accepts: TCP/IP stream
* size in bytes
* buffer to read into
* Returns: T if success, NIL otherwise
*/
long tcp_getbuffer (stream,size,buffer)
TCPSTREAM *stream;
unsigned long size;
char *buffer;
{
unsigned long n;
char *bufptr = buffer;
while (size > 0) { /* until request satisfied */
if (!tcp_getdata (stream)) return NIL;
n = min (size,stream->ictr);/* number of bytes to transfer */
/* do the copy */
memcpy (bufptr,stream->iptr,n);
bufptr += n; /* update pointer */
stream->iptr +=n;
size -= n; /* update # of bytes to do */
stream->ictr -=n;
}
bufptr[0] = '\0'; /* tie off string */
return T;
}
long tcp_abort ();
/* TCP/IP receive data
* Accepts: TCP/IP stream
* Returns: T if success, NIL otherwise
*/
long tcp_getdata (stream)
TCPSTREAM *stream;
{
int i;
fd_set fds;
FD_ZERO (&fds); /* initialize selection vector */
if (stream->tcpsi < 0) return NIL;
while (stream->ictr < 1) { /* if nothing in the buffer */
FD_SET (stream->tcpsi,&fds);/* set bit in selection vector */
errno = NIL; /* block and read */
while (((i = select (stream->tcpsi+1,&fds,0,0,0)) < 0) &&
(errno == EINTR));
if (i < 0) return tcp_abort (stream);
while (((i = read (stream->tcpsi,stream->ibuf,BUFLEN)) < 1) &&
(errno == EINTR));
if (i < 1) return tcp_abort (stream);
stream->ictr = i; /* set new byte count */
stream->iptr = stream->ibuf;/* point at TCP buffer */
}
return T;
}
/* TCP/IP send string as record
* Accepts: TCP/IP stream
* string pointer
* Returns: T if success else NIL
*/
long tcp_soutr (stream,string)
TCPSTREAM *stream;
char *string;
{
return tcp_sout (stream,string,(unsigned long) strlen (string));
}
/* TCP/IP send string
* Accepts: TCP/IP stream
* string pointer
* byte count
* Returns: T if success else NIL
*/
long tcp_sout (stream,string,size)
TCPSTREAM *stream;
char *string;
unsigned long size;
{
int i;
fd_set fds;
FD_ZERO (&fds); /* initialize selection vector */
if (stream->tcpso < 0) return NIL;
while (size > 0) { /* until request satisfied */
FD_SET (stream->tcpso,&fds);/* set bit in selection vector */
errno = NIL; /* block and wrtie */
while (((i = select (stream->tcpso+1,0,&fds,0,0)) < 0) &&
(errno == EINTR));
if (i < 0) return tcp_abort (stream);
while (((i = write (stream->tcpso,string,size)) < 0) &&
(errno == EINTR));
if (i < 0) return tcp_abort (stream);
size -= i; /* how much we sent */
string += i;
}
return T; /* all done */
}
/* TCP/IP close
* Accepts: TCP/IP stream
*/
void tcp_close (stream)
TCPSTREAM *stream;
{
tcp_abort (stream); /* nuke the stream */
/* flush host names */
fs_give ((void **) &stream->host);
fs_give ((void **) &stream->localhost);
fs_give ((void **) &stream); /* flush the stream */
}
/* TCP/IP abort stream
* Accepts: TCP/IP stream
* Returns: NIL always
*/
long tcp_abort (stream)
TCPSTREAM *stream;
{
if (stream->tcpsi >= 0) { /* no-op if no socket */
close (stream->tcpsi); /* nuke the socket */
if (stream->tcpsi != stream->tcpso) close (stream->tcpso);
stream->tcpsi = stream->tcpso = -1;
}
return NIL;
}
/* TCP/IP get host name
* Accepts: TCP/IP stream
* Returns: host name for this stream
*/
char *tcp_host (stream)
TCPSTREAM *stream;
{
return stream->host; /* return host name */
}
/* TCP/IP get local host name
* Accepts: TCP/IP stream
* Returns: local host name
*/
char *tcp_localhost (stream)
TCPSTREAM *stream;
{
return stream->localhost; /* return local host name */
}
/* Emulator for BSD gethostid() call
* Returns: unique identifier for this machine
*/
long gethostid ()
{
/* No gethostid() here, so just fake it and hope things turn out okay. */
return (0L);
}
/* Emulator for BSD random() call
* Returns: long random number
*/
long random ()
{
static int beenhere = 0;
if (!beenhere) {
beenhere = 1;
srand48 (getpid ());
}
return lrand48 ();
}
/* Emulator for BSD scandir() call
* Accepts: directory name
* destination pointer of names array
* selection function
* comparison function
* Returns: number of elements in the array or -1 if error
*/
#define DIRSIZ(d) d->d_reclen
int scandir (dirname,namelist,select,compar)
char *dirname;
struct dirent ***namelist;
int (*select) ();
int (*compar) ();
{
struct dirent *p,*d,**names;
int nitems;
struct stat stb;
long nlmax;
DIR *dirp = opendir (dirname);/* open directory and get status poop */
if ((!dirp) || (fstat (dirp->dd_fd,&stb) < 0)) return -1;
nlmax = stb.st_size / 24; /* guesstimate at number of files */
names = (struct dirent **) fs_get (nlmax * sizeof (struct dirent *));
nitems = 0; /* initially none found */
while (d = readdir (dirp)) { /* read directory item */
/* matches select criterion? */
if (select && !(*select) (d)) continue;
/* get size of dirent record for this file */
p = (struct dirent *) fs_get (DIRSIZ (d));
p->d_ino = d->d_ino; /* copy the poop */
p->d_off = d->d_off;
p->d_reclen = d->d_reclen;
strcpy (p->d_name,d->d_name);
if (++nitems >= nlmax) { /* if out of space, try bigger guesstimate */
nlmax *= 2; /* double it */
fs_resize ((void **) names,nlmax * sizeof (struct dirent *));
}
names[nitems - 1] = p; /* store this file there */
}
closedir (dirp); /* done with directory */
/* sort if necessary */
if (nitems && compar) qsort (names,nitems,sizeof (struct dirent *),compar);
*namelist = names; /* return directory */
return nitems; /* and size */
}
/* Emulator for BSD flock() call
* Accepts: file descriptor
* operation bitmask
* Returns: 0 if successful, -1 if failure
* Note: this emulator does not handle shared locks
*/
int flock (fd, operation)
int fd;
int operation;
{
int func;
off_t offset = lseek (fd,0,L_INCR);
switch (operation & ~LOCK_NB){/* translate to lockf() operation */
case LOCK_EX: /* exclusive */
case LOCK_SH: /* shared */
func = (operation & LOCK_NB) ? F_TLOCK : F_LOCK;
break;
case LOCK_UN: /* unlock */
func = F_ULOCK;
break;
default: /* default */
errno = EINVAL;
return -1;
}
lseek (fd,0,L_SET); /* position to start of the file */
func = lockf (fd,func,0); /* do the lockf() */
lseek (fd,offset,L_SET); /* restore prior position */
return func;
}
/* Emulator for BSD gettimeofday() call
* Accepts: address where to write timeval information
* address where to write timezone information
* Returns: 0 if successful, -1 if failure
*/
int gettimeofday (tp,tzp)
struct timeval *tp;
struct timezone *tzp;
{
tp->tv_sec = time (0); /* time since 1-Jan-70 00:00:00 GMT in secs */
/* others aren't used in current code */
if (tzp) tzp->tz_minuteswest = tzp->tz_dsttime = 0;
tp->tv_usec = 0;
return 0;
}
/* Emulator for BSD utimes() call
* Accepts: file name
* timeval vector for access and updated time
* Returns: 0 if successful, -1 if failure
*/
int utimes (file,tvp)
char *file;
struct timeval tvp[2];
{
struct utimbuf tb;
tb.actime = tvp[0].tv_sec; /* accessed time */
tb.modtime = tvp[1].tv_sec; /* updated time */
return utime (file,&tb);
}