/* perl.c * * Copyright (c) 1987-1994 Larry Wall * * You may distribute under the terms of either the GNU General Public * License or the Artistic License, as specified in the README file. * */ /* * "A ship then new they built for him/of mithril and of elven glass" --Bilbo */ #include "EXTERN.h" #include "perl.h" #include "patchlevel.h" /* Omit -- it causes too much grief on mixed systems. #ifdef I_UNISTD #include #endif */ char rcsid[] = "perl.c\nPatch level: ###\n"; #ifdef IAMSUID #ifndef DOSUID #define DOSUID #endif #endif #ifdef SETUID_SCRIPTS_ARE_SECURE_NOW #ifdef DOSUID #undef DOSUID #endif #endif static void find_beginning _((void)); static void incpush _((char *)); static void init_ids _((void)); static void init_debugger _((void)); static void init_lexer _((void)); static void init_main_stash _((void)); static void init_perllib _((void)); static void init_postdump_symbols _((int, char **, char **)); static void init_predump_symbols _((void)); static void init_stacks _((void)); static void open_script _((char *, bool, SV *)); static void validate_suid _((char *)); PerlInterpreter * perl_alloc() { PerlInterpreter *sv_interp; curinterp = 0; New(53, sv_interp, 1, PerlInterpreter); return sv_interp; } void perl_construct( sv_interp ) register PerlInterpreter *sv_interp; { if (!(curinterp = sv_interp)) return; #ifdef MULTIPLICITY Zero(sv_interp, 1, PerlInterpreter); #endif /* Init the real globals? */ if (!linestr) { linestr = NEWSV(65,80); sv_upgrade(linestr,SVt_PVIV); SvREADONLY_on(&sv_undef); sv_setpv(&sv_no,No); SvNV(&sv_no); SvREADONLY_on(&sv_no); sv_setpv(&sv_yes,Yes); SvNV(&sv_yes); SvREADONLY_on(&sv_yes); #ifdef MSDOS /* * There is no way we can refer to them from Perl so close them to save * space. The other alternative would be to provide STDAUX and STDPRN * filehandles. */ (void)fclose(stdaux); (void)fclose(stdprn); #endif } #ifdef MULTIPLICITY chopset = " \n-"; copline = NOLINE; curcop = &compiling; dlmax = 128; laststatval = -1; laststype = OP_STAT; maxscream = -1; maxsysfd = MAXSYSFD; nrs = "\n"; nrschar = '\n'; nrslen = 1; rs = "\n"; rschar = '\n'; rsfp = Nullfp; rslen = 1; statname = Nullsv; tmps_floor = -1; #endif init_ids(); sprintf(patchlevel, "%5.3f", 5.0 + (PATCHLEVEL / 1000.0)); fdpid = newAV(); /* for remembering popen pids by fd */ pidstatus = newHV();/* for remembering status of dead pids */ init_stacks(); ENTER; } void perl_destruct(sv_interp) register PerlInterpreter *sv_interp; { int destruct_level; /* 0=none, 1=full, 2=full with checks */ I32 last_sv_count; HV *hv; if (!(curinterp = sv_interp)) return; destruct_level = perl_destruct_level; LEAVE; FREETMPS; if (sv_objcount) { /* We must account for everything. First the syntax tree. */ if (main_root) { curpad = AvARRAY(comppad); op_free(main_root); main_root = 0; } } if (sv_objcount) { /* * Try to destruct global references. We do this first so that the * destructors and destructees still exist. Some sv's might remain. * Non-referenced objects are on their own. */ dirty = TRUE; sv_clean_objs(); } if (destruct_level == 0){ DEBUG_P(debprofdump()); /* The exit() function will do everything that needs doing. */ return; } /* Prepare to destruct main symbol table. */ hv = defstash; defstash = 0; SvREFCNT_dec(hv); FREETMPS; if (destruct_level >= 2) { if (scopestack_ix != 0) warn("Unbalanced scopes: %d more ENTERs than LEAVEs\n", scopestack_ix); if (savestack_ix != 0) warn("Unbalanced saves: %d more saves than restores\n", savestack_ix); if (tmps_floor != -1) warn("Unbalanced tmps: %d more allocs than frees\n", tmps_floor + 1); if (cxstack_ix != -1) warn("Unbalanced context: %d more PUSHes than POPs\n", cxstack_ix + 1); } /* Now absolutely destruct everything, somehow or other, loops or no. */ last_sv_count = 0; while (sv_count != 0 && sv_count != last_sv_count) { last_sv_count = sv_count; sv_clean_all(); } if (sv_count != 0) warn("Scalars leaked: %d\n", sv_count); DEBUG_P(debprofdump()); } void perl_free(sv_interp) PerlInterpreter *sv_interp; { if (!(curinterp = sv_interp)) return; Safefree(sv_interp); } #if !defined(STANDARD_C) && !defined(HAS_GETENV_PROTOTYPE) char *getenv _((char *)); /* Usually in */ #endif int perl_parse(sv_interp, xsinit, argc, argv, env) PerlInterpreter *sv_interp; void (*xsinit)_((void)); int argc; char **argv; char **env; { register SV *sv; register char *s; char *scriptname; VOL bool dosearch = FALSE; char *validarg = ""; AV* comppadlist; #ifdef SETUID_SCRIPTS_ARE_SECURE_NOW #ifdef IAMSUID #undef IAMSUID croak("suidperl is no longer needed since the kernel can now execute\n\ setuid perl scripts securely.\n"); #endif #endif if (!(curinterp = sv_interp)) return 255; origargv = argv; origargc = argc; #ifndef VMS /* VMS doesn't have environ array */ origenviron = environ; #endif if (do_undump) { /* Come here if running an undumped a.out. */ origfilename = savepv(argv[0]); do_undump = FALSE; cxstack_ix = -1; /* start label stack again */ init_ids(); init_postdump_symbols(argc,argv,env); return 0; } if (main_root) op_free(main_root); main_root = 0; switch (setjmp(top_env)) { case 1: #ifdef VMS statusvalue = 255; #else statusvalue = 1; #endif case 2: curstash = defstash; if (endav) calllist(endav); return(statusvalue); /* my_exit() was called */ case 3: fprintf(stderr, "panic: top_env\n"); return 1; } sv_setpvn(linestr,"",0); sv = newSVpv("",0); /* first used for -I flags */ SAVEFREESV(sv); init_main_stash(); for (argc--,argv++; argc > 0; argc--,argv++) { if (argv[0][0] != '-' || !argv[0][1]) break; #ifdef DOSUID if (*validarg) validarg = " PHOOEY "; else validarg = argv[0]; #endif s = argv[0]+1; reswitch: switch (*s) { case '0': case 'F': case 'a': case 'c': case 'd': case 'D': case 'i': case 'l': case 'n': case 'p': case 's': case 'T': case 'u': case 'U': case 'v': case 'w': if (s = moreswitches(s)) goto reswitch; break; case 'e': if (euid != uid || egid != gid) croak("No -e allowed in setuid scripts"); if (!e_fp) { e_tmpname = savepv(TMPPATH); (void)mktemp(e_tmpname); if (!*e_tmpname) croak("Can't mktemp()"); e_fp = fopen(e_tmpname,"w"); if (!e_fp) croak("Cannot open temporary file"); } if (argv[1]) { fputs(argv[1],e_fp); argc--,argv++; } (void)putc('\n', e_fp); break; case 'I': taint_not("-I"); sv_catpv(sv,"-"); sv_catpv(sv,s); sv_catpv(sv," "); if (*++s) { av_push(GvAVn(incgv),newSVpv(s,0)); } else if (argv[1]) { av_push(GvAVn(incgv),newSVpv(argv[1],0)); sv_catpv(sv,argv[1]); argc--,argv++; sv_catpv(sv," "); } break; case 'P': taint_not("-P"); preprocess = TRUE; s++; goto reswitch; case 'S': taint_not("-S"); dosearch = TRUE; s++; goto reswitch; case 'x': doextract = TRUE; s++; if (*s) cddir = savepv(s); break; case '-': argc--,argv++; goto switch_end; case 0: break; default: croak("Unrecognized switch: -%s",s); } } switch_end: scriptname = argv[0]; if (e_fp) { if (fflush(e_fp) || ferror(e_fp) || fclose(e_fp)) croak("Can't write to temp file for -e: %s", Strerror(errno)); argc++,argv--; scriptname = e_tmpname; } else if (scriptname == Nullch) { #ifdef MSDOS if ( isatty(fileno(stdin)) ) moreswitches("v"); #endif scriptname = "-"; } init_perllib(); open_script(scriptname,dosearch,sv); validate_suid(validarg); if (doextract) find_beginning(); compcv = (CV*)NEWSV(1104,0); sv_upgrade((SV *)compcv, SVt_PVCV); pad = newAV(); comppad = pad; av_push(comppad, Nullsv); curpad = AvARRAY(comppad); padname = newAV(); comppad_name = padname; comppad_name_fill = 0; min_intro_pending = 0; padix = 0; comppadlist = newAV(); AvREAL_off(comppadlist); av_store(comppadlist, 0, SvREFCNT_inc((SV*)comppad_name)); av_store(comppadlist, 1, SvREFCNT_inc((SV*)comppad)); CvPADLIST(compcv) = comppadlist; if (xsinit) (*xsinit)(); /* in case linked C routines want magical variables */ #ifdef VMS init_os_extras(); #endif init_predump_symbols(); if (!do_undump) init_postdump_symbols(argc,argv,env); init_lexer(); /* now parse the script */ error_count = 0; if (yyparse() || error_count) { if (minus_c) croak("%s had compilation errors.\n", origfilename); else { croak("Execution of %s aborted due to compilation errors.\n", origfilename); } } curcop->cop_line = 0; curstash = defstash; preprocess = FALSE; if (e_fp) { e_fp = Nullfp; (void)UNLINK(e_tmpname); } /* now that script is parsed, we can modify record separator */ rs = nrs; rslen = nrslen; rschar = nrschar; rspara = (nrslen == 2); sv_setpvn(GvSV(gv_fetchpv("/", TRUE, SVt_PV)), rs, rslen); if (do_undump) my_unexec(); if (dowarn) gv_check(defstash); LEAVE; FREETMPS; ENTER; restartop = 0; return 0; } int perl_run(sv_interp) PerlInterpreter *sv_interp; { if (!(curinterp = sv_interp)) return 255; switch (setjmp(top_env)) { case 1: cxstack_ix = -1; /* start context stack again */ break; case 2: curstash = defstash; if (endav) calllist(endav); FREETMPS; return(statusvalue); /* my_exit() was called */ case 3: if (!restartop) { fprintf(stderr, "panic: restartop\n"); FREETMPS; return 1; } if (stack != mainstack) { dSP; SWITCHSTACK(stack, mainstack); } break; } if (!restartop) { DEBUG_x(dump_all()); DEBUG(fprintf(stderr,"\nEXECUTING...\n\n")); if (minus_c) { fprintf(stderr,"%s syntax OK\n", origfilename); my_exit(0); } if (perldb && DBsingle) sv_setiv(DBsingle, 1); } /* do it */ if (restartop) { op = restartop; restartop = 0; run(); } else if (main_start) { op = main_start; run(); } my_exit(0); return 0; } void my_exit(status) U32 status; { register CONTEXT *cx; I32 gimme; SV **newsp; statusvalue = FIXSTATUS(status); if (cxstack_ix >= 0) { if (cxstack_ix > 0) dounwind(0); POPBLOCK(cx,curpm); LEAVE; } longjmp(top_env, 2); } SV* perl_get_sv(name, create) char* name; I32 create; { GV* gv = gv_fetchpv(name, create, SVt_PV); if (gv) return GvSV(gv); return Nullsv; } AV* perl_get_av(name, create) char* name; I32 create; { GV* gv = gv_fetchpv(name, create, SVt_PVAV); if (create) return GvAVn(gv); if (gv) return GvAV(gv); return Nullav; } HV* perl_get_hv(name, create) char* name; I32 create; { GV* gv = gv_fetchpv(name, create, SVt_PVHV); if (create) return GvHVn(gv); if (gv) return GvHV(gv); return Nullhv; } CV* perl_get_cv(name, create) char* name; I32 create; { GV* gv = gv_fetchpv(name, create, SVt_PVCV); if (create && !GvCV(gv)) return newSUB(start_subparse(), newSVOP(OP_CONST, 0, newSVpv(name,0)), Nullop); if (gv) return GvCV(gv); return Nullcv; } /* Be sure to refetch the stack pointer after calling these routines. */ I32 perl_call_argv(subname, flags, argv) char *subname; I32 flags; /* See G_* flags in cop.h */ register char **argv; /* null terminated arg list */ { dSP; PUSHMARK(sp); if (argv) { while (*argv) { XPUSHs(sv_2mortal(newSVpv(*argv,0))); argv++; } PUTBACK; } return perl_call_pv(subname, flags); } I32 perl_call_pv(subname, flags) char *subname; /* name of the subroutine */ I32 flags; /* See G_* flags in cop.h */ { return perl_call_sv((SV*)perl_get_cv(subname, TRUE), flags); } I32 perl_call_method(methname, flags) char *methname; /* name of the subroutine */ I32 flags; /* See G_* flags in cop.h */ { dSP; OP myop; if (!op) op = &myop; XPUSHs(sv_2mortal(newSVpv(methname,0))); PUTBACK; pp_method(); return perl_call_sv(*stack_sp--, flags); } /* May be called with any of a CV, a GV, or an SV containing the name. */ I32 perl_call_sv(sv, flags) SV* sv; I32 flags; /* See G_* flags in cop.h */ { LOGOP myop; /* fake syntax tree node */ SV** sp = stack_sp; I32 oldmark = TOPMARK; I32 retval; jmp_buf oldtop; I32 oldscope; if (flags & G_DISCARD) { ENTER; SAVETMPS; } SAVESPTR(op); op = (OP*)&myop; Zero(op, 1, LOGOP); EXTEND(stack_sp, 1); *++stack_sp = sv; oldscope = scopestack_ix; if (!(flags & G_NOARGS)) myop.op_flags = OPf_STACKED; myop.op_next = Nullop; myop.op_flags |= OPf_KNOW; if (flags & G_ARRAY) myop.op_flags |= OPf_LIST; if (flags & G_EVAL) { Copy(top_env, oldtop, 1, jmp_buf); cLOGOP->op_other = op; markstack_ptr--; pp_entertry(); markstack_ptr++; restart: switch (setjmp(top_env)) { case 0: break; case 1: #ifdef VMS statusvalue = 255; /* XXX I don't think we use 1 anymore. */ #else statusvalue = 1; #endif /* FALL THROUGH */ case 2: /* my_exit() was called */ curstash = defstash; FREETMPS; Copy(oldtop, top_env, 1, jmp_buf); if (statusvalue) croak("Callback called exit"); my_exit(statusvalue); /* NOTREACHED */ case 3: if (restartop) { op = restartop; restartop = 0; goto restart; } stack_sp = stack_base + oldmark; if (flags & G_ARRAY) retval = 0; else { retval = 1; *++stack_sp = &sv_undef; } goto cleanup; } } if (op == (OP*)&myop) op = pp_entersub(); if (op) run(); retval = stack_sp - (stack_base + oldmark); if (flags & G_EVAL) sv_setpv(GvSV(gv_fetchpv("@",TRUE, SVt_PV)),""); cleanup: if (flags & G_EVAL) { if (scopestack_ix > oldscope) { SV **newsp; PMOP *newpm; I32 gimme; register CONTEXT *cx; I32 optype; POPBLOCK(cx,newpm); POPEVAL(cx); pop_return(); curpm = newpm; LEAVE; } Copy(oldtop, top_env, 1, jmp_buf); } if (flags & G_DISCARD) { stack_sp = stack_base + oldmark; retval = 0; FREETMPS; LEAVE; } return retval; } /* Older forms, here grandfathered. */ #ifdef DEPRECATED I32 perl_callargv(subname, spix, gimme, argv) char *subname; register I32 spix; /* current stack pointer index */ I32 gimme; /* See G_* flags in cop.h */ register char **argv; /* null terminated arg list, NULL for no arglist */ { stack_sp = stack_base + spix; return spix + perl_call_argv(subname, gimme, argv); } I32 perl_callpv(subname, spix, gimme, hasargs, numargs) char *subname; I32 spix; /* stack pointer index after args are pushed */ I32 gimme; /* See G_* flags in cop.h */ I32 hasargs; /* whether to create a @_ array for routine */ I32 numargs; /* how many args are pushed on the stack */ { stack_sp = stack_base + spix; PUSHMARK(stack_sp - numargs); return spix - numargs + perl_call_sv((SV*)perl_get_cv(subname, TRUE), gimme, hasargs, numargs); } I32 perl_callsv(sv, spix, gimme, hasargs, numargs) SV* sv; I32 spix; /* stack pointer index after args are pushed */ I32 gimme; /* See G_* flags in cop.h */ I32 hasargs; /* whether to create a @_ array for routine */ I32 numargs; /* how many args are pushed on the stack */ { stack_sp = stack_base + spix; PUSHMARK(stack_sp - numargs); return spix - numargs + perl_call_sv(sv, gimme, hasargs, numargs); } #endif /* Require a module. */ void perl_requirepv(pv) char* pv; { UNOP myop; /* fake syntax tree node */ SV* sv; dSP; ENTER; SAVETMPS; SAVESPTR(op); sv = sv_newmortal(); sv_setpv(sv, pv); op = (OP*)&myop; Zero(op, 1, UNOP); XPUSHs(sv); myop.op_type = OP_REQUIRE; myop.op_next = Nullop; myop.op_private = 1; myop.op_flags = OPf_KNOW; PUTBACK; if (op = pp_require()) run(); stack_sp--; FREETMPS; LEAVE; } void magicname(sym,name,namlen) char *sym; char *name; I32 namlen; { register GV *gv; if (gv = gv_fetchpv(sym,TRUE, SVt_PV)) sv_magic(GvSV(gv), (SV*)gv, 0, name, namlen); } #if defined(DOSISH) # define PERLLIB_SEP ';' #elif defined(VMS) # define PERLLIB_SEP '|' #else # define PERLLIB_SEP ':' #endif static void incpush(p) char *p; { char *s; if (!p) return; /* Break at all separators */ while (*p) { /* First, skip any consecutive separators */ while ( *p == PERLLIB_SEP ) { /* Uncomment the next line for PATH semantics */ /* av_push(GvAVn(incgv), newSVpv(".", 1)); */ p++; } if ( (s = strchr(p, PERLLIB_SEP)) != Nullch ) { av_push(GvAVn(incgv), newSVpv(p, (STRLEN)(s - p))); p = s + 1; } else { av_push(GvAVn(incgv), newSVpv(p, 0)); break; } } } /* This routine handles any switches that can be given during run */ char * moreswitches(s) char *s; { I32 numlen; switch (*s) { case '0': nrschar = scan_oct(s, 4, &numlen); nrs = savepvn("\n",1); *nrs = nrschar; if (nrschar > 0377) { nrslen = 0; nrs = ""; } else if (!nrschar && numlen >= 2) { nrslen = 2; nrs = "\n\n"; nrschar = '\n'; } return s + numlen; case 'F': minus_F = TRUE; splitstr = savepv(s + 1); s += strlen(s); return s; case 'a': minus_a = TRUE; s++; return s; case 'c': minus_c = TRUE; s++; return s; case 'd': taint_not("-d"); if (!perldb) { perldb = TRUE; init_debugger(); } s++; return s; case 'D': #ifdef DEBUGGING taint_not("-D"); if (isALPHA(s[1])) { static char debopts[] = "psltocPmfrxuLHXD"; char *d; for (s++; *s && (d = strchr(debopts,*s)); s++) debug |= 1 << (d - debopts); } else { debug = atoi(s+1); for (s++; isDIGIT(*s); s++) ; } debug |= 0x80000000; #else warn("Recompile perl with -DDEBUGGING to use -D switch\n"); for (s++; isALNUM(*s); s++) ; #endif /*SUPPRESS 530*/ return s; case 'i': if (inplace) Safefree(inplace); inplace = savepv(s+1); /*SUPPRESS 530*/ for (s = inplace; *s && !isSPACE(*s); s++) ; *s = '\0'; break; case 'I': taint_not("-I"); if (*++s) { char *e; for (e = s; *e && !isSPACE(*e); e++) ; av_push(GvAVn(incgv),newSVpv(s,e-s)); if (*e) return e; } else croak("No space allowed after -I"); break; case 'l': minus_l = TRUE; s++; if (ors) Safefree(ors); if (isDIGIT(*s)) { ors = savepv("\n"); orslen = 1; *ors = scan_oct(s, 3 + (*s == '0'), &numlen); s += numlen; } else { ors = savepvn(nrs,nrslen); orslen = nrslen; } return s; case 'n': minus_n = TRUE; s++; return s; case 'p': minus_p = TRUE; s++; return s; case 's': taint_not("-s"); doswitches = TRUE; s++; return s; case 'T': tainting = TRUE; s++; return s; case 'u': do_undump = TRUE; s++; return s; case 'U': unsafe = TRUE; s++; return s; case 'v': printf("\nThis is perl, version %s\n\n",patchlevel); fputs("\nCopyright 1987-1994, Larry Wall\n",stdout); #ifdef MSDOS fputs("MS-DOS port Copyright (c) 1989, 1990, Diomidis Spinellis\n", stdout); #ifdef OS2 fputs("OS/2 port Copyright (c) 1990, 1991, Raymond Chen, Kai Uwe Rommel\n", stdout); #endif #endif #ifdef atarist fputs("atariST series port, ++jrb bammi@cadence.com\n", stdout); #endif fputs("\n\ Perl may be copied only under the terms of either the Artistic License or the\n\ GNU General Public License, which may be found in the Perl 5.0 source kit.\n",stdout); #ifdef MSDOS usage(origargv[0]); #endif exit(0); case 'w': dowarn = TRUE; s++; return s; case '*': case ' ': if (s[1] == '-') /* Additional switches on #! line. */ return s+2; break; case '-': case 0: case '\n': case '\t': break; case 'P': if (preprocess) return s+1; /* FALL THROUGH */ default: croak("Can't emulate -%.1s on #! line",s); } return Nullch; } /* compliments of Tom Christiansen */ /* unexec() can be found in the Gnu emacs distribution */ void my_unexec() { #ifdef UNEXEC int status; extern int etext; sprintf (buf, "%s.perldump", origfilename); sprintf (tokenbuf, "%s/perl", BIN); status = unexec(buf, tokenbuf, &etext, sbrk(0), 0); if (status) fprintf(stderr, "unexec of %s into %s failed!\n", tokenbuf, buf); exit(status); #else ABORT(); /* for use with undump */ #endif } static void init_main_stash() { GV *gv; curstash = defstash = newHV(); curstname = newSVpv("main",4); gv = gv_fetchpv("main::",TRUE, SVt_PVHV); SvREFCNT_dec(GvHV(gv)); GvHV(gv) = (HV*)SvREFCNT_inc(defstash); SvREADONLY_on(gv); HvNAME(defstash) = savepv("main"); incgv = gv_HVadd(gv_AVadd(gv_fetchpv("INC",TRUE, SVt_PVAV))); SvMULTI_on(incgv); defgv = gv_fetchpv("_",TRUE, SVt_PVAV); curstash = defstash; compiling.cop_stash = defstash; debstash = GvHV(gv_fetchpv("DB::", GV_ADDMULTI, SVt_PVHV)); } #ifdef CAN_PROTOTYPE static void open_script(char *scriptname, bool dosearch, SV *sv) #else static void open_script(scriptname,dosearch,sv) char *scriptname; bool dosearch; SV *sv; #endif { char *xfound = Nullch; char *xfailed = Nullch; register char *s; I32 len; if (dosearch && !strchr(scriptname, '/') && (s = getenv("PATH"))) { bufend = s + strlen(s); while (*s) { #ifndef DOSISH s = cpytill(tokenbuf,s,bufend,':',&len); #else #ifdef atarist for (len = 0; *s && *s != ',' && *s != ';'; tokenbuf[len++] = *s++); tokenbuf[len] = '\0'; #else for (len = 0; *s && *s != ';'; tokenbuf[len++] = *s++); tokenbuf[len] = '\0'; #endif #endif if (*s) s++; #ifndef DOSISH if (len && tokenbuf[len-1] != '/') #else #ifdef atarist if (len && ((tokenbuf[len-1] != '\\') && (tokenbuf[len-1] != '/'))) #else if (len && tokenbuf[len-1] != '\\') #endif #endif (void)strcat(tokenbuf+len,"/"); (void)strcat(tokenbuf+len,scriptname); DEBUG_p(fprintf(stderr,"Looking for %s\n",tokenbuf)); if (Stat(tokenbuf,&statbuf) < 0) /* not there? */ continue; if (S_ISREG(statbuf.st_mode) && cando(S_IRUSR,TRUE,&statbuf) && cando(S_IXUSR,TRUE,&statbuf)) { xfound = tokenbuf; /* bingo! */ break; } if (!xfailed) xfailed = savepv(tokenbuf); } if (!xfound) croak("Can't execute %s", xfailed ? xfailed : scriptname ); if (xfailed) Safefree(xfailed); scriptname = xfound; } origfilename = savepv(e_fp ? "-e" : scriptname); curcop->cop_filegv = gv_fetchfile(origfilename); if (strEQ(origfilename,"-")) scriptname = ""; if (preprocess) { char *cpp = CPPSTDIN; if (strEQ(cpp,"cppstdin")) sprintf(tokenbuf, "%s/%s", SCRIPTDIR, cpp); else sprintf(tokenbuf, "%s", cpp); sv_catpv(sv,"-I"); sv_catpv(sv,PRIVLIB_EXP); #ifdef MSDOS (void)sprintf(buf, "\ sed %s -e \"/^[^#]/b\" \ -e \"/^#[ ]*include[ ]/b\" \ -e \"/^#[ ]*define[ ]/b\" \ -e \"/^#[ ]*if[ ]/b\" \ -e \"/^#[ ]*ifdef[ ]/b\" \ -e \"/^#[ ]*ifndef[ ]/b\" \ -e \"/^#[ ]*else/b\" \ -e \"/^#[ ]*elif[ ]/b\" \ -e \"/^#[ ]*undef[ ]/b\" \ -e \"/^#[ ]*endif/b\" \ -e \"s/^#.*//\" \ %s | %s -C %s %s", (doextract ? "-e \"1,/^#/d\n\"" : ""), #else (void)sprintf(buf, "\ %s %s -e '/^[^#]/b' \ -e '/^#[ ]*include[ ]/b' \ -e '/^#[ ]*define[ ]/b' \ -e '/^#[ ]*if[ ]/b' \ -e '/^#[ ]*ifdef[ ]/b' \ -e '/^#[ ]*ifndef[ ]/b' \ -e '/^#[ ]*else/b' \ -e '/^#[ ]*elif[ ]/b' \ -e '/^#[ ]*undef[ ]/b' \ -e '/^#[ ]*endif/b' \ -e 's/^[ ]*#.*//' \ %s | %s -C %s %s", #ifdef LOC_SED LOC_SED, #else "sed", #endif (doextract ? "-e '1,/^#/d\n'" : ""), #endif scriptname, tokenbuf, SvPV(sv, na), CPPMINUS); doextract = FALSE; #ifdef IAMSUID /* actually, this is caught earlier */ if (euid != uid && !euid) { /* if running suidperl */ #ifdef HAS_SETEUID (void)seteuid(uid); /* musn't stay setuid root */ #else #ifdef HAS_SETREUID (void)setreuid((Uid_t)-1, uid); #else #ifdef HAS_SETRESUID (void)setresuid((Uid_t)-1, uid, (Uid_t)-1); #else setuid(uid); #endif #endif #endif if (geteuid() != uid) croak("Can't do seteuid!\n"); } #endif /* IAMSUID */ rsfp = my_popen(buf,"r"); } else if (!*scriptname) { taint_not("program input from stdin"); rsfp = stdin; } else rsfp = fopen(scriptname,"r"); if ((FILE*)rsfp == Nullfp) { #ifdef DOSUID #ifndef IAMSUID /* in case script is not readable before setuid */ if (euid && Stat(SvPVX(GvSV(curcop->cop_filegv)),&statbuf) >= 0 && statbuf.st_mode & (S_ISUID|S_ISGID)) { (void)sprintf(buf, "%s/sperl%s", BIN, patchlevel); execv(buf, origargv); /* try again */ croak("Can't do setuid\n"); } #endif #endif croak("Can't open perl script \"%s\": %s\n", SvPVX(GvSV(curcop->cop_filegv)), Strerror(errno)); } } static void validate_suid(validarg) char *validarg; { /* do we need to emulate setuid on scripts? */ /* This code is for those BSD systems that have setuid #! scripts disabled * in the kernel because of a security problem. Merely defining DOSUID * in perl will not fix that problem, but if you have disabled setuid * scripts in the kernel, this will attempt to emulate setuid and setgid * on scripts that have those now-otherwise-useless bits set. The setuid * root version must be called suidperl or sperlN.NNN. If regular perl * discovers that it has opened a setuid script, it calls suidperl with * the same argv that it had. If suidperl finds that the script it has * just opened is NOT setuid root, it sets the effective uid back to the * uid. We don't just make perl setuid root because that loses the * effective uid we had before invoking perl, if it was different from the * uid. * * DOSUID must be defined in both perl and suidperl, and IAMSUID must * be defined in suidperl only. suidperl must be setuid root. The * Configure script will set this up for you if you want it. */ #ifdef DOSUID char *s; if (Fstat(fileno(rsfp),&statbuf) < 0) /* normal stat is insecure */ croak("Can't stat script \"%s\"",origfilename); if (statbuf.st_mode & (S_ISUID|S_ISGID)) { I32 len; #ifdef IAMSUID #ifndef HAS_SETREUID /* On this access check to make sure the directories are readable, * there is actually a small window that the user could use to make * filename point to an accessible directory. So there is a faint * chance that someone could execute a setuid script down in a * non-accessible directory. I don't know what to do about that. * But I don't think it's too important. The manual lies when * it says access() is useful in setuid programs. */ if (access(SvPVX(GvSV(curcop->cop_filegv)),1)) /*double check*/ croak("Permission denied"); #else /* If we can swap euid and uid, then we can determine access rights * with a simple stat of the file, and then compare device and * inode to make sure we did stat() on the same file we opened. * Then we just have to make sure he or she can execute it. */ { struct stat tmpstatbuf; if ( #ifdef HAS_SETREUID setreuid(euid,uid) < 0 #else # if HAS_SETRESUID setresuid(euid,uid,(Uid_t)-1) < 0 # endif #endif || getuid() != euid || geteuid() != uid) croak("Can't swap uid and euid"); /* really paranoid */ if (Stat(SvPVX(GvSV(curcop->cop_filegv)),&tmpstatbuf) < 0) croak("Permission denied"); /* testing full pathname here */ if (tmpstatbuf.st_dev != statbuf.st_dev || tmpstatbuf.st_ino != statbuf.st_ino) { (void)fclose(rsfp); if (rsfp = my_popen("/bin/mail root","w")) { /* heh, heh */ fprintf(rsfp, "User %d tried to run dev %d ino %d in place of dev %d ino %d!\n\ (Filename of set-id script was %s, uid %d gid %d.)\n\nSincerely,\nperl\n", uid,tmpstatbuf.st_dev, tmpstatbuf.st_ino, statbuf.st_dev, statbuf.st_ino, SvPVX(GvSV(curcop->cop_filegv)), statbuf.st_uid, statbuf.st_gid); (void)my_pclose(rsfp); } croak("Permission denied\n"); } if ( #ifdef HAS_SETREUID setreuid(uid,euid) < 0 #else # if defined(HAS_SETRESUID) setresuid(uid,euid,(Uid_t)-1) < 0 # endif #endif || getuid() != uid || geteuid() != euid) croak("Can't reswap uid and euid"); if (!cando(S_IXUSR,FALSE,&statbuf)) /* can real uid exec? */ croak("Permission denied\n"); } #endif /* HAS_SETREUID */ #endif /* IAMSUID */ if (!S_ISREG(statbuf.st_mode)) croak("Permission denied"); if (statbuf.st_mode & S_IWOTH) croak("Setuid/gid script is writable by world"); doswitches = FALSE; /* -s is insecure in suid */ curcop->cop_line++; if (fgets(tokenbuf,sizeof tokenbuf, rsfp) == Nullch || strnNE(tokenbuf,"#!",2) ) /* required even on Sys V */ croak("No #! line"); s = tokenbuf+2; if (*s == ' ') s++; while (!isSPACE(*s)) s++; if (strnNE(s-4,"perl",4) && strnNE(s-9,"perl",4)) /* sanity check */ croak("Not a perl script"); while (*s == ' ' || *s == '\t') s++; /* * #! arg must be what we saw above. They can invoke it by * mentioning suidperl explicitly, but they may not add any strange * arguments beyond what #! says if they do invoke suidperl that way. */ len = strlen(validarg); if (strEQ(validarg," PHOOEY ") || strnNE(s,validarg,len) || !isSPACE(s[len])) croak("Args must match #! line"); #ifndef IAMSUID if (euid != uid && (statbuf.st_mode & S_ISUID) && euid == statbuf.st_uid) if (!do_undump) croak("YOU HAVEN'T DISABLED SET-ID SCRIPTS IN THE KERNEL YET!\n\ FIX YOUR KERNEL, PUT A C WRAPPER AROUND THIS SCRIPT, OR USE -u AND UNDUMP!\n"); #endif /* IAMSUID */ if (euid) { /* oops, we're not the setuid root perl */ (void)fclose(rsfp); #ifndef IAMSUID (void)sprintf(buf, "%s/sperl%s", BIN, patchlevel); execv(buf, origargv); /* try again */ #endif croak("Can't do setuid\n"); } if (statbuf.st_mode & S_ISGID && statbuf.st_gid != egid) { #ifdef HAS_SETEGID (void)setegid(statbuf.st_gid); #else #ifdef HAS_SETREGID (void)setregid((Gid_t)-1,statbuf.st_gid); #else #ifdef HAS_SETRESGID (void)setresgid((Gid_t)-1,statbuf.st_gid,(Gid_t)-1); #else setgid(statbuf.st_gid); #endif #endif #endif if (getegid() != statbuf.st_gid) croak("Can't do setegid!\n"); } if (statbuf.st_mode & S_ISUID) { if (statbuf.st_uid != euid) #ifdef HAS_SETEUID (void)seteuid(statbuf.st_uid); /* all that for this */ #else #ifdef HAS_SETREUID (void)setreuid((Uid_t)-1,statbuf.st_uid); #else #ifdef HAS_SETRESUID (void)setresuid((Uid_t)-1,statbuf.st_uid,(Uid_t)-1); #else setuid(statbuf.st_uid); #endif #endif #endif if (geteuid() != statbuf.st_uid) croak("Can't do seteuid!\n"); } else if (uid) { /* oops, mustn't run as root */ #ifdef HAS_SETEUID (void)seteuid((Uid_t)uid); #else #ifdef HAS_SETREUID (void)setreuid((Uid_t)-1,(Uid_t)uid); #else #ifdef HAS_SETRESUID (void)setresuid((Uid_t)-1,(Uid_t)uid,(Uid_t)-1); #else setuid((Uid_t)uid); #endif #endif #endif if (geteuid() != uid) croak("Can't do seteuid!\n"); } init_ids(); if (!cando(S_IXUSR,TRUE,&statbuf)) croak("Permission denied\n"); /* they can't do this */ } #ifdef IAMSUID else if (preprocess) croak("-P not allowed for setuid/setgid script\n"); else croak("Script is not setuid/setgid in suidperl\n"); #endif /* IAMSUID */ #else /* !DOSUID */ if (euid != uid || egid != gid) { /* (suidperl doesn't exist, in fact) */ #ifndef SETUID_SCRIPTS_ARE_SECURE_NOW Fstat(fileno(rsfp),&statbuf); /* may be either wrapped or real suid */ if ((euid != uid && euid == statbuf.st_uid && statbuf.st_mode & S_ISUID) || (egid != gid && egid == statbuf.st_gid && statbuf.st_mode & S_ISGID) ) if (!do_undump) croak("YOU HAVEN'T DISABLED SET-ID SCRIPTS IN THE KERNEL YET!\n\ FIX YOUR KERNEL, PUT A C WRAPPER AROUND THIS SCRIPT, OR USE -u AND UNDUMP!\n"); #endif /* SETUID_SCRIPTS_ARE_SECURE_NOW */ /* not set-id, must be wrapped */ } #endif /* DOSUID */ } static void find_beginning() { register char *s; /* skip forward in input to the real script? */ taint_not("-x"); while (doextract) { if ((s = sv_gets(linestr, rsfp, 0)) == Nullch) croak("No Perl script found in input\n"); if (*s == '#' && s[1] == '!' && instr(s,"perl")) { ungetc('\n',rsfp); /* to keep line count right */ doextract = FALSE; if (s = instr(s,"perl -")) { s += 6; /*SUPPRESS 530*/ while (s = moreswitches(s)) ; } if (cddir && chdir(cddir) < 0) croak("Can't chdir to %s",cddir); } } } static void init_ids() { uid = (int)getuid(); euid = (int)geteuid(); gid = (int)getgid(); egid = (int)getegid(); #ifdef VMS uid |= gid << 16; euid |= egid << 16; #endif tainting |= (euid != uid || egid != gid); } static void init_debugger() { curstash = debstash; dbargs = GvAV(gv_AVadd((gv_fetchpv("args", GV_ADDMULTI, SVt_PVAV)))); AvREAL_off(dbargs); DBgv = gv_fetchpv("DB", GV_ADDMULTI, SVt_PVGV); DBline = gv_fetchpv("dbline", GV_ADDMULTI, SVt_PVAV); DBsub = gv_HVadd(gv_fetchpv("sub", GV_ADDMULTI, SVt_PVHV)); DBsingle = GvSV((gv_fetchpv("single", GV_ADDMULTI, SVt_PV))); DBtrace = GvSV((gv_fetchpv("trace", GV_ADDMULTI, SVt_PV))); DBsignal = GvSV((gv_fetchpv("signal", GV_ADDMULTI, SVt_PV))); curstash = defstash; } static void init_stacks() { stack = newAV(); mainstack = stack; /* remember in case we switch stacks */ AvREAL_off(stack); /* not a real array */ av_extend(stack,127); stack_base = AvARRAY(stack); stack_sp = stack_base; stack_max = stack_base + 127; New(54,markstack,64,I32); markstack_ptr = markstack; markstack_max = markstack + 64; New(54,scopestack,32,I32); scopestack_ix = 0; scopestack_max = 32; New(54,savestack,128,ANY); savestack_ix = 0; savestack_max = 128; New(54,retstack,16,OP*); retstack_ix = 0; retstack_max = 16; New(50,cxstack,128,CONTEXT); cxstack_ix = -1; cxstack_max = 128; New(50,tmps_stack,128,SV*); tmps_ix = -1; tmps_max = 128; DEBUG( { New(51,debname,128,char); New(52,debdelim,128,char); } ) } static FILE *tmpfp; /* moved outside init_lexer() because of UNICOS bug */ static void init_lexer() { tmpfp = rsfp; lex_start(linestr); rsfp = tmpfp; subname = newSVpv("main",4); } static void init_predump_symbols() { GV *tmpgv; GV *othergv; sv_setpvn(GvSV(gv_fetchpv("\"", TRUE, SVt_PV)), " ", 1); stdingv = gv_fetchpv("STDIN",TRUE, SVt_PVIO); SvMULTI_on(stdingv); IoIFP(GvIOp(stdingv)) = stdin; tmpgv = gv_fetchpv("stdin",TRUE, SVt_PV); GvIOp(tmpgv) = (IO*)SvREFCNT_inc(GvIOp(stdingv)); SvMULTI_on(tmpgv); tmpgv = gv_fetchpv("STDOUT",TRUE, SVt_PVIO); SvMULTI_on(tmpgv); IoOFP(GvIOp(tmpgv)) = IoIFP(GvIOp(tmpgv)) = stdout; defoutgv = tmpgv; tmpgv = gv_fetchpv("stdout",TRUE, SVt_PV); GvIOp(tmpgv) = (IO*)SvREFCNT_inc(GvIOp(defoutgv)); SvMULTI_on(tmpgv); othergv = gv_fetchpv("STDERR",TRUE, SVt_PVIO); SvMULTI_on(othergv); IoOFP(GvIOp(othergv)) = IoIFP(GvIOp(othergv)) = stderr; tmpgv = gv_fetchpv("stderr",TRUE, SVt_PV); GvIOp(tmpgv) = (IO*)SvREFCNT_inc(GvIOp(othergv)); SvMULTI_on(tmpgv); statname = NEWSV(66,0); /* last filename we did stat on */ } static void init_postdump_symbols(argc,argv,env) register int argc; register char **argv; register char **env; { char *s; SV *sv; GV* tmpgv; argc--,argv++; /* skip name of script */ if (doswitches) { for (; argc > 0 && **argv == '-'; argc--,argv++) { if (!argv[0][1]) break; if (argv[0][1] == '-') { argc--,argv++; break; } if (s = strchr(argv[0], '=')) { *s++ = '\0'; sv_setpv(GvSV(gv_fetchpv(argv[0]+1,TRUE, SVt_PV)),s); } else sv_setiv(GvSV(gv_fetchpv(argv[0]+1,TRUE, SVt_PV)),1); } } toptarget = NEWSV(0,0); sv_upgrade(toptarget, SVt_PVFM); sv_setpvn(toptarget, "", 0); bodytarget = NEWSV(0,0); sv_upgrade(bodytarget, SVt_PVFM); sv_setpvn(bodytarget, "", 0); formtarget = bodytarget; tainted = 1; if (tmpgv = gv_fetchpv("0",TRUE, SVt_PV)) { sv_setpv(GvSV(tmpgv),origfilename); magicname("0", "0", 1); } if (tmpgv = gv_fetchpv("\024",TRUE, SVt_PV)) time(&basetime); if (tmpgv = gv_fetchpv("\030",TRUE, SVt_PV)) sv_setpv(GvSV(tmpgv),origargv[0]); if (argvgv = gv_fetchpv("ARGV",TRUE, SVt_PVAV)) { SvMULTI_on(argvgv); (void)gv_AVadd(argvgv); av_clear(GvAVn(argvgv)); for (; argc > 0; argc--,argv++) { av_push(GvAVn(argvgv),newSVpv(argv[0],0)); } } if (envgv = gv_fetchpv("ENV",TRUE, SVt_PVHV)) { HV *hv; SvMULTI_on(envgv); hv = GvHVn(envgv); hv_clear(hv); #ifndef VMS /* VMS doesn't have environ array */ if (env != environ) { environ[0] = Nullch; hv_magic(hv, envgv, 'E'); } #endif #ifdef DYNAMIC_ENV_FETCH HvNAME(hv) = savepv(ENV_HV_NAME); #endif for (; *env; env++) { if (!(s = strchr(*env,'='))) continue; *s++ = '\0'; sv = newSVpv(s--,0); sv_magic(sv, sv, 'e', *env, s - *env); (void)hv_store(hv, *env, s - *env, sv, 0); *s = '='; } hv_magic(hv, envgv, 'E'); } tainted = 0; if (tmpgv = gv_fetchpv("$",TRUE, SVt_PV)) sv_setiv(GvSV(tmpgv),(I32)getpid()); } static void init_perllib() { char *s; if (!tainting) { s = getenv("PERL5LIB"); if (s) incpush(s); else incpush(getenv("PERLLIB")); } #ifdef ARCHLIB_EXP incpush(ARCHLIB_EXP); #endif #ifndef PRIVLIB_EXP #define PRIVLIB_EXP "/usr/local/lib/perl5:/usr/local/lib/perl" #endif incpush(PRIVLIB_EXP); av_push(GvAVn(incgv),newSVpv(".",1)); } void calllist(list) AV* list; { jmp_buf oldtop; STRLEN len; line_t oldline = curcop->cop_line; Copy(top_env, oldtop, 1, jmp_buf); while (AvFILL(list) >= 0) { CV *cv = (CV*)av_shift(list); SAVEFREESV(cv); switch (setjmp(top_env)) { case 0: { SV* atsv = GvSV(gv_fetchpv("@",TRUE, SVt_PV)); PUSHMARK(stack_sp); perl_call_sv((SV*)cv, G_EVAL|G_DISCARD); (void)SvPV(atsv, len); if (len) { Copy(oldtop, top_env, 1, jmp_buf); curcop = &compiling; curcop->cop_line = oldline; if (list == beginav) sv_catpv(atsv, "BEGIN failed--compilation aborted"); else sv_catpv(atsv, "END failed--cleanup aborted"); croak("%s", SvPVX(atsv)); } } break; case 1: #ifdef VMS statusvalue = 255; /* XXX I don't think we use 1 anymore. */ #else statusvalue = 1; #endif /* FALL THROUGH */ case 2: /* my_exit() was called */ curstash = defstash; if (endav) calllist(endav); FREETMPS; Copy(oldtop, top_env, 1, jmp_buf); curcop = &compiling; curcop->cop_line = oldline; if (statusvalue) { if (list == beginav) croak("BEGIN failed--compilation aborted"); else croak("END failed--cleanup aborted"); } my_exit(statusvalue); /* NOTREACHED */ return; case 3: if (!restartop) { fprintf(stderr, "panic: restartop\n"); FREETMPS; break; } Copy(oldtop, top_env, 1, jmp_buf); curcop = &compiling; curcop->cop_line = oldline; longjmp(top_env, 3); } } Copy(oldtop, top_env, 1, jmp_buf); }