forked from schacon/perl
/
doio.c
1937 lines (1764 loc) · 39 KB
/
doio.c
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/* $Header: doio.c,v 3.0 89/10/18 15:10:54 lwall Locked $
*
* Copyright (c) 1989, Larry Wall
*
* You may distribute under the terms of the GNU General Public License
* as specified in the README file that comes with the perl 3.0 kit.
*
* $Log: doio.c,v $
* Revision 3.0 89/10/18 15:10:54 lwall
* 3.0 baseline
*
*/
#include "EXTERN.h"
#include "perl.h"
#ifdef SOCKET
#include <sys/socket.h>
#include <netdb.h>
#endif
#include <errno.h>
#ifdef I_PWD
#include <pwd.h>
#endif
#ifdef I_GRP
#include <grp.h>
#endif
extern int errno;
bool
do_open(stab,name)
STAB *stab;
register char *name;
{
FILE *fp;
int len = strlen(name);
register STIO *stio = stab_io(stab);
char *myname = savestr(name);
int result;
int fd;
int writing = 0;
char mode[3]; /* stdio file mode ("r\0" or "r+\0") */
name = myname;
forkprocess = 1; /* assume true if no fork */
while (len && isspace(name[len-1]))
name[--len] = '\0';
if (!stio)
stio = stab_io(stab) = stio_new();
else if (stio->ifp) {
fd = fileno(stio->ifp);
if (stio->type == '|')
result = mypclose(stio->ifp);
else if (stio->ifp != stio->ofp) {
if (stio->ofp)
fclose(stio->ofp);
result = fclose(stio->ifp);
}
else if (stio->type != '-')
result = fclose(stio->ifp);
else
result = 0;
if (result == EOF && fd > 2)
fprintf(stderr,"Warning: unable to close filehandle %s properly.\n",
stab_name(stab));
stio->ofp = stio->ifp = Nullfp;
}
if (*name == '+' && len > 1 && name[len-1] != '|') { /* scary */
mode[1] = *name++;
mode[2] = '\0';
--len;
writing = 1;
}
else {
mode[1] = '\0';
}
stio->type = *name;
if (*name == '|') {
for (name++; isspace(*name); name++) ;
#ifdef TAINT
taintenv();
taintproper("Insecure dependency in piped open");
#endif
fp = mypopen(name,"w");
writing = 1;
}
else if (*name == '>' && name[1] == '>') {
#ifdef TAINT
taintproper("Insecure dependency in open");
#endif
mode[0] = stio->type = 'a';
for (name += 2; isspace(*name); name++) ;
fp = fopen(name, mode);
writing = 1;
}
else if (*name == '>' && name[1] == '&') {
#ifdef TAINT
taintproper("Insecure dependency in open");
#endif
for (name += 2; isspace(*name); name++) ;
if (isdigit(*name))
fd = atoi(name);
else {
stab = stabent(name,FALSE);
if (stab_io(stab) && stab_io(stab)->ifp) {
fd = fileno(stab_io(stab)->ifp);
stio->type = stab_io(stab)->type;
}
else
fd = -1;
}
fp = fdopen(dup(fd),stio->type == 'a' ? "a" :
(stio->type == '<' ? "r" : "w") );
writing = 1;
}
else if (*name == '>') {
#ifdef TAINT
taintproper("Insecure dependency in open");
#endif
for (name++; isspace(*name); name++) ;
if (strEQ(name,"-")) {
fp = stdout;
stio->type = '-';
}
else {
mode[0] = 'w';
fp = fopen(name,mode);
}
writing = 1;
}
else {
if (*name == '<') {
for (name++; isspace(*name); name++) ;
if (strEQ(name,"-")) {
fp = stdin;
stio->type = '-';
}
else {
mode[0] = 'r';
fp = fopen(name,mode);
}
}
else if (name[len-1] == '|') {
#ifdef TAINT
taintenv();
taintproper("Insecure dependency in piped open");
#endif
name[--len] = '\0';
while (len && isspace(name[len-1]))
name[--len] = '\0';
for (; isspace(*name); name++) ;
fp = mypopen(name,"r");
stio->type = '|';
}
else {
stio->type = '<';
for (; isspace(*name); name++) ;
if (strEQ(name,"-")) {
fp = stdin;
stio->type = '-';
}
else
fp = fopen(name,"r");
}
}
Safefree(myname);
if (!fp)
return FALSE;
if (stio->type &&
stio->type != '|' && stio->type != '-') {
if (fstat(fileno(fp),&statbuf) < 0) {
(void)fclose(fp);
return FALSE;
}
if ((statbuf.st_mode & S_IFMT) != S_IFREG &&
#ifdef S_IFSOCK
(statbuf.st_mode & S_IFMT) != S_IFSOCK &&
#endif
#ifdef S_IFFIFO
(statbuf.st_mode & S_IFMT) != S_IFFIFO &&
#endif
(statbuf.st_mode & S_IFMT) != S_IFCHR) {
(void)fclose(fp);
return FALSE;
}
}
stio->ifp = fp;
if (writing)
stio->ofp = fp;
return TRUE;
}
FILE *
nextargv(stab)
register STAB *stab;
{
register STR *str;
char *oldname;
int filemode,fileuid,filegid;
while (alen(stab_xarray(stab)) >= 0) {
str = ashift(stab_xarray(stab));
str_sset(stab_val(stab),str);
STABSET(stab_val(stab));
oldname = str_get(stab_val(stab));
if (do_open(stab,oldname)) {
if (inplace) {
#ifdef TAINT
taintproper("Insecure dependency in inplace open");
#endif
filemode = statbuf.st_mode;
fileuid = statbuf.st_uid;
filegid = statbuf.st_gid;
if (*inplace) {
str_cat(str,inplace);
#ifdef RENAME
(void)rename(oldname,str->str_ptr);
#else
(void)UNLINK(str->str_ptr);
(void)link(oldname,str->str_ptr);
(void)UNLINK(oldname);
#endif
}
else {
(void)UNLINK(oldname);
}
str_nset(str,">",1);
str_cat(str,oldname);
errno = 0; /* in case sprintf set errno */
if (!do_open(argvoutstab,str->str_ptr))
fatal("Can't do inplace edit");
defoutstab = argvoutstab;
#ifdef FCHMOD
(void)fchmod(fileno(stab_io(argvoutstab)->ifp),filemode);
#else
(void)chmod(oldname,filemode);
#endif
#ifdef FCHOWN
(void)fchown(fileno(stab_io(argvoutstab)->ifp),fileuid,filegid);
#else
(void)chown(oldname,fileuid,filegid);
#endif
}
str_free(str);
return stab_io(stab)->ifp;
}
else
fprintf(stderr,"Can't open %s\n",str_get(str));
str_free(str);
}
if (inplace) {
(void)do_close(argvoutstab,FALSE);
defoutstab = stabent("STDOUT",TRUE);
}
return Nullfp;
}
bool
do_close(stab,explicit)
STAB *stab;
bool explicit;
{
bool retval = FALSE;
register STIO *stio = stab_io(stab);
int status;
if (!stio) { /* never opened */
if (dowarn && explicit)
warn("Close on unopened file <%s>",stab_name(stab));
return FALSE;
}
if (stio->ifp) {
if (stio->type == '|') {
status = mypclose(stio->ifp);
retval = (status >= 0);
statusvalue = (unsigned)status & 0xffff;
}
else if (stio->type == '-')
retval = TRUE;
else {
if (stio->ofp && stio->ofp != stio->ifp) /* a socket */
fclose(stio->ofp);
retval = (fclose(stio->ifp) != EOF);
}
stio->ofp = stio->ifp = Nullfp;
}
if (explicit)
stio->lines = 0;
stio->type = ' ';
return retval;
}
bool
do_eof(stab)
STAB *stab;
{
register STIO *stio;
int ch;
if (!stab) { /* eof() */
if (argvstab)
stio = stab_io(argvstab);
else
return TRUE;
}
else
stio = stab_io(stab);
if (!stio)
return TRUE;
while (stio->ifp) {
#ifdef STDSTDIO /* (the code works without this) */
if (stio->ifp->_cnt > 0) /* cheat a little, since */
return FALSE; /* this is the most usual case */
#endif
ch = getc(stio->ifp);
if (ch != EOF) {
(void)ungetc(ch, stio->ifp);
return FALSE;
}
if (!stab) { /* not necessarily a real EOF yet? */
if (!nextargv(argvstab)) /* get another fp handy */
return TRUE;
}
else
return TRUE; /* normal fp, definitely end of file */
}
return TRUE;
}
long
do_tell(stab)
STAB *stab;
{
register STIO *stio;
if (!stab)
goto phooey;
stio = stab_io(stab);
if (!stio || !stio->ifp)
goto phooey;
if (feof(stio->ifp))
(void)fseek (stio->ifp, 0L, 2); /* ultrix 1.2 workaround */
return ftell(stio->ifp);
phooey:
if (dowarn)
warn("tell() on unopened file");
return -1L;
}
bool
do_seek(stab, pos, whence)
STAB *stab;
long pos;
int whence;
{
register STIO *stio;
if (!stab)
goto nuts;
stio = stab_io(stab);
if (!stio || !stio->ifp)
goto nuts;
if (feof(stio->ifp))
(void)fseek (stio->ifp, 0L, 2); /* ultrix 1.2 workaround */
return fseek(stio->ifp, pos, whence) >= 0;
nuts:
if (dowarn)
warn("seek() on unopened file");
return FALSE;
}
int
do_ctl(optype,stab,func,argstr)
int optype;
STAB *stab;
int func;
STR *argstr;
{
register STIO *stio;
register char *s;
int retval;
if (!stab || !argstr)
return -1;
stio = stab_io(stab);
if (!stio)
return -1;
if (argstr->str_pok || !argstr->str_nok) {
if (!argstr->str_pok)
s = str_get(argstr);
#ifdef IOCPARM_MASK
#ifndef IOCPARM_LEN
#define IOCPARM_LEN(x) (((x) >> 16) & IOCPARM_MASK)
#endif
#endif
#ifdef IOCPARM_LEN
retval = IOCPARM_LEN(func); /* on BSDish systes we're safe */
#else
retval = 256; /* otherwise guess at what's safe */
#endif
if (argstr->str_cur < retval) {
str_grow(argstr,retval+1);
argstr->str_cur = retval;
}
s = argstr->str_ptr;
s[argstr->str_cur] = 17; /* a little sanity check here */
}
else {
retval = (int)str_gnum(argstr);
s = (char*)retval; /* ouch */
}
#ifndef lint
if (optype == O_IOCTL)
retval = ioctl(fileno(stio->ifp), func, s);
else
#ifdef I_FCNTL
retval = fcntl(fileno(stio->ifp), func, s);
#else
fatal("fcntl is not implemented");
#endif
#else /* lint */
retval = 0;
#endif /* lint */
if (argstr->str_pok) {
if (s[argstr->str_cur] != 17)
fatal("Return value overflowed string");
s[argstr->str_cur] = 0; /* put our null back */
}
return retval;
}
int
do_stat(str,arg,gimme,arglast)
STR *str;
register ARG *arg;
int gimme;
int *arglast;
{
register ARRAY *ary = stack;
register int sp = arglast[0] + 1;
int max = 13;
register int i;
if ((arg[1].arg_type & A_MASK) == A_WORD) {
tmpstab = arg[1].arg_ptr.arg_stab;
if (tmpstab != defstab) {
statstab = tmpstab;
str_set(statname,"");
if (!stab_io(tmpstab) ||
fstat(fileno(stab_io(tmpstab)->ifp),&statcache) < 0) {
max = 0;
}
}
}
else {
str_sset(statname,ary->ary_array[sp]);
statstab = Nullstab;
#ifdef SYMLINK
if (arg->arg_type == O_LSTAT)
i = lstat(str_get(statname),&statcache);
else
#endif
i = stat(str_get(statname),&statcache);
if (i < 0)
max = 0;
}
if (gimme != G_ARRAY) {
if (max)
str_sset(str,&str_yes);
else
str_sset(str,&str_undef);
STABSET(str);
ary->ary_array[sp] = str;
return sp;
}
sp--;
if (max) {
#ifndef lint
(void)astore(ary,++sp,
str_2static(str_nmake((double)statcache.st_dev)));
(void)astore(ary,++sp,
str_2static(str_nmake((double)statcache.st_ino)));
(void)astore(ary,++sp,
str_2static(str_nmake((double)statcache.st_mode)));
(void)astore(ary,++sp,
str_2static(str_nmake((double)statcache.st_nlink)));
(void)astore(ary,++sp,
str_2static(str_nmake((double)statcache.st_uid)));
(void)astore(ary,++sp,
str_2static(str_nmake((double)statcache.st_gid)));
(void)astore(ary,++sp,
str_2static(str_nmake((double)statcache.st_rdev)));
(void)astore(ary,++sp,
str_2static(str_nmake((double)statcache.st_size)));
(void)astore(ary,++sp,
str_2static(str_nmake((double)statcache.st_atime)));
(void)astore(ary,++sp,
str_2static(str_nmake((double)statcache.st_mtime)));
(void)astore(ary,++sp,
str_2static(str_nmake((double)statcache.st_ctime)));
#ifdef STATBLOCKS
(void)astore(ary,++sp,
str_2static(str_nmake((double)statcache.st_blksize)));
(void)astore(ary,++sp,
str_2static(str_nmake((double)statcache.st_blocks)));
#else
(void)astore(ary,++sp,
str_2static(str_make("",0)));
(void)astore(ary,++sp,
str_2static(str_make("",0)));
#endif
#else /* lint */
(void)astore(ary,++sp,str_nmake(0.0));
#endif /* lint */
}
return sp;
}
int
looks_like_number(str)
STR *str;
{
register char *s;
register char *send;
if (!str->str_pok)
return TRUE;
s = str->str_ptr;
send = s + str->str_cur;
while (isspace(*s))
s++;
if (s >= send)
return FALSE;
if (*s == '+' || *s == '-')
s++;
while (isdigit(*s))
s++;
if (s == send)
return TRUE;
if (*s == '.')
s++;
else if (s == str->str_ptr)
return FALSE;
while (isdigit(*s))
s++;
if (s == send)
return TRUE;
if (*s == 'e' || *s == 'E') {
s++;
if (*s == '+' || *s == '-')
s++;
while (isdigit(*s))
s++;
}
while (isspace(*s))
s++;
if (s >= send)
return TRUE;
return FALSE;
}
bool
do_print(str,fp)
register STR *str;
FILE *fp;
{
register char *tmps;
if (!fp) {
if (dowarn)
warn("print to unopened file");
return FALSE;
}
if (!str)
return FALSE;
if (ofmt &&
((str->str_nok && str->str_u.str_nval != 0.0)
|| (looks_like_number(str) && str_gnum(str) != 0.0) ) )
fprintf(fp, ofmt, str->str_u.str_nval);
else {
tmps = str_get(str);
if (*tmps == 'S' && tmps[1] == 't' && tmps[2] == 'a' && tmps[3] == 'b'
&& str->str_cur == sizeof(STBP) && strlen(tmps) < str->str_cur) {
tmps = stab_name(((STAB*)str)); /* a stab value, be nice */
str = ((STAB*)str)->str_magic;
putc('*',fp);
}
if (str->str_cur && fwrite(tmps,1,str->str_cur,fp) == 0)
return FALSE;
}
return TRUE;
}
bool
do_aprint(arg,fp,arglast)
register ARG *arg;
register FILE *fp;
int *arglast;
{
register STR **st = stack->ary_array;
register int sp = arglast[1];
register int retval;
register int items = arglast[2] - sp;
if (!fp) {
if (dowarn)
warn("print to unopened file");
return FALSE;
}
st += ++sp;
if (arg->arg_type == O_PRTF) {
do_sprintf(arg->arg_ptr.arg_str,items,st);
retval = do_print(arg->arg_ptr.arg_str,fp);
}
else {
retval = (items <= 0);
for (; items > 0; items--,st++) {
if (retval && ofslen) {
if (fwrite(ofs, 1, ofslen, fp) == 0) {
retval = FALSE;
break;
}
}
if (!(retval = do_print(*st, fp)))
break;
}
if (retval && orslen)
if (fwrite(ors, 1, orslen, fp) == 0)
retval = FALSE;
}
return retval;
}
int
mystat(arg,str)
ARG *arg;
STR *str;
{
STIO *stio;
if (arg[1].arg_type & A_DONT) {
stio = stab_io(arg[1].arg_ptr.arg_stab);
if (stio && stio->ifp) {
statstab = arg[1].arg_ptr.arg_stab;
str_set(statname,"");
return fstat(fileno(stio->ifp), &statcache);
}
else {
if (arg[1].arg_ptr.arg_stab == defstab)
return 0;
if (dowarn)
warn("Stat on unopened file <%s>",
stab_name(arg[1].arg_ptr.arg_stab));
statstab = Nullstab;
str_set(statname,"");
return -1;
}
}
else {
statstab = Nullstab;
str_sset(statname,str);
return stat(str_get(str),&statcache);
}
}
STR *
do_fttext(arg,str)
register ARG *arg;
STR *str;
{
int i;
int len;
int odd = 0;
STDCHAR tbuf[512];
register STDCHAR *s;
register STIO *stio;
if (arg[1].arg_type & A_DONT) {
if (arg[1].arg_ptr.arg_stab == defstab) {
if (statstab)
stio = stab_io(statstab);
else {
str = statname;
goto really_filename;
}
}
else {
statstab = arg[1].arg_ptr.arg_stab;
str_set(statname,"");
stio = stab_io(statstab);
}
if (stio && stio->ifp) {
#ifdef STDSTDIO
fstat(fileno(stio->ifp),&statcache);
if (stio->ifp->_cnt <= 0) {
i = getc(stio->ifp);
if (i != EOF)
(void)ungetc(i,stio->ifp);
}
if (stio->ifp->_cnt <= 0) /* null file is anything */
return &str_yes;
len = stio->ifp->_cnt + (stio->ifp->_ptr - stio->ifp->_base);
s = stio->ifp->_base;
#else
fatal("-T and -B not implemented on filehandles\n");
#endif
}
else {
if (dowarn)
warn("Test on unopened file <%s>",
stab_name(arg[1].arg_ptr.arg_stab));
return &str_undef;
}
}
else {
statstab = Nullstab;
str_sset(statname,str);
really_filename:
i = open(str_get(str),0);
if (i < 0)
return &str_undef;
fstat(i,&statcache);
len = read(i,tbuf,512);
if (len <= 0) /* null file is anything */
return &str_yes;
(void)close(i);
s = tbuf;
}
/* now scan s to look for textiness */
for (i = 0; i < len; i++,s++) {
if (!*s) { /* null never allowed in text */
odd += len;
break;
}
else if (*s & 128)
odd++;
else if (*s < 32 &&
*s != '\n' && *s != '\r' && *s != '\b' &&
*s != '\t' && *s != '\f' && *s != 27)
odd++;
}
if ((odd * 10 > len) == (arg->arg_type == O_FTTEXT)) /* allow 10% odd */
return &str_no;
else
return &str_yes;
}
bool
do_aexec(really,arglast)
STR *really;
int *arglast;
{
register STR **st = stack->ary_array;
register int sp = arglast[1];
register int items = arglast[2] - sp;
register char **a;
char **argv;
char *tmps;
if (items) {
New(401,argv, items+1, char*);
a = argv;
for (st += ++sp; items > 0; items--,st++) {
if (*st)
*a++ = str_get(*st);
else
*a++ = "";
}
*a = Nullch;
#ifdef TAINT
if (*argv[0] != '/') /* will execvp use PATH? */
taintenv(); /* testing IFS here is overkill, probably */
#endif
if (really && *(tmps = str_get(really)))
execvp(tmps,argv);
else
execvp(argv[0],argv);
Safefree(argv);
}
return FALSE;
}
bool
do_exec(cmd)
char *cmd;
{
register char **a;
register char *s;
char **argv;
char flags[10];
#ifdef TAINT
taintenv();
taintproper("Insecure dependency in exec");
#endif
/* save an extra exec if possible */
if (csh > 0 && strnEQ(cmd,"/bin/csh -c",11)) {
strcpy(flags,"-c");
s = cmd+11;
if (*s == 'f') {
s++;
strcat(flags,"f");
}
if (*s == ' ')
s++;
if (*s++ == '\'') {
char *ncmd = s;
while (*s)
s++;
if (s[-1] == '\n')
*--s = '\0';
if (s[-1] == '\'') {
*--s = '\0';
execl("/bin/csh","csh", flags,ncmd,(char*)0);
*s = '\'';
return FALSE;
}
}
}
/* see if there are shell metacharacters in it */
for (s = cmd; *s; s++) {
if (*s != ' ' && !isalpha(*s) && index("$&*(){}[]'\";\\|?<>~`\n",*s)) {
if (*s == '\n' && !s[1]) {
*s = '\0';
break;
}
doshell:
execl("/bin/sh","sh","-c",cmd,(char*)0);
return FALSE;
}
}
New(402,argv, (s - cmd) / 2 + 2, char*);
a = argv;
for (s = cmd; *s;) {
while (*s && isspace(*s)) s++;
if (*s)
*(a++) = s;
while (*s && !isspace(*s)) s++;
if (*s)
*s++ = '\0';
}
*a = Nullch;
if (argv[0]) {
execvp(argv[0],argv);
if (errno == ENOEXEC) /* for system V NIH syndrome */
goto doshell;
}
Safefree(argv);
return FALSE;
}
#ifdef SOCKET
int
do_socket(stab, arglast)
STAB *stab;
int *arglast;
{
register STR **st = stack->ary_array;
register int sp = arglast[1];
register STIO *stio;
int domain, type, protocol, fd;
if (!stab)
return FALSE;
stio = stab_io(stab);
if (!stio)
stio = stab_io(stab) = stio_new();
else if (stio->ifp)
do_close(stab,FALSE);
domain = (int)str_gnum(st[++sp]);
type = (int)str_gnum(st[++sp]);
protocol = (int)str_gnum(st[++sp]);
#ifdef TAINT
taintproper("Insecure dependency in socket");
#endif
fd = socket(domain,type,protocol);
if (fd < 0)
return FALSE;
stio->ifp = fdopen(fd, "r"); /* stdio gets confused about sockets */
stio->ofp = fdopen(fd, "w");
stio->type = 's';
return TRUE;
}
int
do_bind(stab, arglast)
STAB *stab;
int *arglast;
{
register STR **st = stack->ary_array;
register int sp = arglast[1];
register STIO *stio;
char *addr;
if (!stab)
goto nuts;
stio = stab_io(stab);
if (!stio || !stio->ifp)
goto nuts;
addr = str_get(st[++sp]);
#ifdef TAINT
taintproper("Insecure dependency in bind");
#endif
return bind(fileno(stio->ifp), addr, st[sp]->str_cur) >= 0;
nuts:
if (dowarn)
warn("bind() on closed fd");
return FALSE;
}
int
do_connect(stab, arglast)
STAB *stab;
int *arglast;
{
register STR **st = stack->ary_array;
register int sp = arglast[1];
register STIO *stio;
char *addr;
if (!stab)
goto nuts;
stio = stab_io(stab);
if (!stio || !stio->ifp)
goto nuts;
addr = str_get(st[++sp]);
#ifdef TAINT
taintproper("Insecure dependency in connect");
#endif
return connect(fileno(stio->ifp), addr, st[sp]->str_cur) >= 0;
nuts:
if (dowarn)
warn("connect() on closed fd");
return FALSE;
}
int
do_listen(stab, arglast)
STAB *stab;
int *arglast;
{
register STR **st = stack->ary_array;
register int sp = arglast[1];
register STIO *stio;
int backlog;
if (!stab)
goto nuts;
stio = stab_io(stab);
if (!stio || !stio->ifp)
goto nuts;
backlog = (int)str_gnum(st[++sp]);
return listen(fileno(stio->ifp), backlog) >= 0;
nuts:
if (dowarn)
warn("listen() on closed fd");