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os_dyn.c
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C/C++ Source or Header
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1994-01-09
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880 lines
/*
* Program: Operating-system dependent routines -- Dynix version
*
* Author: Mark Crispin
* Networks and Distributed Computing
* Computing & Communications
* University of Washington
* Administration Building, AG-44
* Seattle, WA 98195
*
* Date: 11 May 1989
* 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/time.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <ctype.h>
#include <errno.h>
extern int errno; /* just in case */
#include <pwd.h>
#include <syslog.h>
#include "mail.h"
#include "misc.h"
extern char *timezone ();
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;
char *zonename;
struct tm *t;
struct timeval tv;
struct timezone tz;
gettimeofday (&tv,&tz); /* get time and timezone poop */
t = localtime (&tv.tv_sec); /* convert to individual items */
/* use this for older systems */
zone = (t->tm_isdst ? 60 : 0) -tz.tz_minuteswest;
zonename = timezone (tz.tz_minuteswest,t->tm_isdst);
/* 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,zonename);
}
/* 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 strcrlfcpy 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));
/* no entry for this user or root */
if (!(pw && pw->pw_uid)) return NIL;
/* validate password */
if (strcmp (pw->pw_passwd,(char *) crypt (pass,pw->pw_passwd))) 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 *uname = NIL;
char *myusername ()
{
return uname ? uname : (uname = 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;
long port;
{
TCPSTREAM *stream = NIL;
int sock;
char *s;
struct sockaddr_in sin;
struct hostent *host_name;
char hostname[MAILTMPLEN];
char tmp[MAILTMPLEN];
/* 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 */
if ((sock = socket (sin.sin_family,SOCK_STREAM,0)) < 0) {
sprintf (tmp,"Unable to create TCP socket: %s",strerror (errno));
mm_log (tmp,ERROR);
return NIL;
}
/* open connection */
if (connect (sock,(struct sockaddr *)&sin,sizeof (sin)) < 0) {
sprintf (tmp,"Can't connect to %.80s,%d: %s",hostname,port,
strerror (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 */
}
/* Find token in string
* Accepts: source pointer or NIL to use previous source
* vector of token delimiters pointer
* Returns: pointer to next token
*/
char *ts = NIL; /* string to locate tokens */
char *strtok (s,ct)
char *s;
char *ct;
{
char *t;
if (!s) s = ts; /* use previous token if none specified */
if (!(s && *s)) return NIL; /* no tokens */
/* find any leading delimiters */
do for (t = ct, ts = NIL; *t; t++) if (*t == *s) {
if (*(ts = ++s)) break; /* yes, restart seach if more in string */
return ts = NIL; /* else no more tokens */
} while (ts); /* continue until no more leading delimiters */
/* can we find a new delimiter? */
for (ts = s; *ts; ts++) for (t = ct; *t; t++) if (*t == *ts) {
*ts++ = '\0'; /* yes, tie off token at that point */
return s; /* return our token */
}
ts = NIL; /* no more tokens */
return s; /* return final token */
}
/* Find first occurance of character in string
* Accepts: source pointer
* character to search
* Returns: pointer to character or NIL if none
*/
char *strchr (cs,c)
char *cs;
char c;
{
return index (cs,c); /* they should have this one */
}
/* Find last occurance of character in string
* Accepts: source pointer
* character to search
* Returns: pointer to character or NIL if none
*/
char *strrchr (cs,c)
char *cs;
char c;
{
return rindex (cs,c); /* they should have this one */
}
/* Return pointer to first occurance in string of a substring
* Accepts: source pointer
* substring pointer
* Returns: pointer to substring in source or NIL if not found
*/
char *strstr (cs,ct)
char *cs;
char *ct;
{
char *s;
char *t;
while (cs = index (cs,*ct)) { /* for each occurance of the first character */
/* see if remainder of string matches */
for (s = cs + 1, t = ct + 1; *t && *s == *t; s++, t++);
if (!*t) return cs; /* if ran out of substring then have match */
cs++; /* try from next character */
}
return NIL; /* not found */
}
/* Return pointer to first occurance in string of any delimiter
* Accepts: source pointer
* vector of delimiters pointer
* Returns: pointer to delimiter or NIL if not found
*/
char *strpbrk (cs,ct)
char *cs;
char *ct;
{
char *s;
/* search for delimiter until end of string */
for (; *cs; cs++) for (s = ct; *s; s++) if (*s == *cs) return cs;
return NIL; /* not found */
}
/* Return implementation-defined string corresponding to error
* Accepts: error number
* Returns: string for that error
*/
char *strerror (n)
int n;
{
return (n >= 0 && n < sys_nerr) ? sys_errlist[n] : NIL;
}
/* Copy memory block
* Accepts: destination pointer
* source pointer
* length
* Returns: destination pointer
*/
char *memcpy (s,ct,n)
char *s;
char *ct;
int n;
{
bcopy (ct,s,n); /* they should have this one */
return ct;
}
/* Copy memory block
* Accepts: destination pointer
* source pointer
* length
* Returns: destination pointer
*/
char *memmove (s,ct,n)
char *s;
char *ct;
int n;
{
bcopy (ct,s,n); /* they should have this one */
return ct;
}
/* Set a block of memory
* Accepts: destination pointer
* value to set
* length
* Returns: destination pointer
*/
char *memset (s,c,n)
char *s;
char c;
int n;
{
if (c) while (n) s[--n] = c; /* this way if non-zero */
else bzero (s,n); /* they should have this one */
return s;
}
/*
* Turn a string long into the real thing
* Accepts: source string
* pointer to place to return end pointer
* base
* Returns: parsed long integer, end pointer is updated
*/
long strtol (s,endp,base)
char *s;
char **endp;
int base;
{
long value = 0; /* the accumulated value */
int negative = 0; /* this a negative number? */
int ok; /* true while valid chars for number */
char c;
/* insist upon valid base */
if (base && (base < 2 || base > 36)) return NIL;
while (isspace (*s)) s++; /* skip leading whitespace */
if (!base) { /* if base = 0, */
if (*s == '-') { /* integer constants are allowed a */
negative = 1; /* leading unary minus, but not */
s++; /* unary plus. */
}
else negative = 0;
if (*s == '0') { /* if it starts with 0, its either */
/* 0X, which marks a hex constant, */
if (toupper (*++s) == 'X') {
s++; /* skip the X */
base = 16; /* base is hex 16 */
}
else base = 8; /* leading 0 means octal number */
}
else base = 10; /* otherwise, decimal. */
do {
switch (base) { /* char has to be valid for base */
case 8: /* this digit ok? */
ok = isodigit(*s);
break;
case 10:
ok = isdigit(*s);
break;
case 16:
ok = isxdigit(*s);
break;
default: /* it's good form you know */
return NIL;
}
/* if valid char, accumulate */
if (ok) value = value * base + toint(*s++);
} while (ok);
if (toupper(*s) == 'L') s++;/* ignore 'l' or 'L' marker */
if (endp) *endp = s; /* set user pointer to after num */
return (negative) ? -value : value;
}
switch (*s) { /* check for leading sign char */
case '-':
negative = 1; /* yes, negative #. fall into '+' */
case '+':
s++; /* skip the sign character */
}
/* allow hex prefix "0x" */
if (base == 16 && *s == '0' && toupper (*(s + 1)) == 'X') s += 2;
do {
/* convert to numeric form if digit*/
if (isdigit (*s)) c = toint (*s);
/* alphabetic conversion */
else if (isalpha (*s)) c = *s - (isupper (*s) ? 'A' : 'a') + 10;
else break; /* else no way it's valid */
if (c >= base) break; /* digit out of range for base? */
value = value * base + c; /* accumulate the digit */
} while (*++s); /* loop until non-numeric character */
if (endp) *endp = s; /* save users endp to after number */
/* negate number if needed */
return (negative) ? -value : value;
}