/*********************************************************************** * * * This software is part of the ast package * * Copyright (c) 1982-2009 AT&T Intellectual Property * * and is licensed under the * * Common Public License, Version 1.0 * * by AT&T Intellectual Property * * * * A copy of the License is available at * * http://www.opensource.org/licenses/cpl1.0.txt * * (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) * * * * Information and Software Systems Research * * AT&T Research * * Florham Park NJ * * * * David Korn * * * ***********************************************************************/ #pragma prototyped /* * David Korn * AT&T Labs * */ #include "defs.h" #include #include #include #include "variables.h" #include "path.h" #include "io.h" #include "jobs.h" #include "history.h" #include "test.h" #include "FEATURE/dynamic" #include "FEATURE/externs" #if SHOPT_PFSH # ifdef _hdr_exec_attr # include # else # undef SHOPT_PFSH # endif # if _lib_vfork # include # else # define vfork() fork() # endif #endif #define RW_ALL (S_IRUSR|S_IRGRP|S_IROTH|S_IWUSR|S_IWGRP|S_IWOTH) #define LIBCMD "cmd" static int canexecute(char*,int); static void funload(Shell_t*,int,const char*); static void exscript(Shell_t*,char*, char*[], char**); static int path_chkpaths(Pathcomp_t*,Pathcomp_t*,Pathcomp_t*,int); static void path_checkdup(register Pathcomp_t*); static const char *std_path; static int onstdpath(const char *name) { register const char *cp = std_path, *sp; if(cp) while(*cp) { for(sp=name; *sp && (*cp == *sp); sp++,cp++); if(*sp==0 && (*cp==0 || *cp==':')) return(1); while(*cp && *cp++!=':'); } return(0); } static pid_t path_pfexecve(const char *path, char *argv[],char *const envp[],int spawn) { #if SHOPT_PFSH pid_t pid; char resolvedpath[PATH_MAX + 1]; if(spawn) { while((pid = vfork()) < 0) _sh_fork(pid, 0, (int*)0); if(pid) return(pid); } if(!sh_isoption(SH_PFSH)) return(execve(path, argv, envp)); /* Solaris implements realpath(3C) using the resolvepath(2) */ /* system call so we can save us to call access(2) first */ if (!realpath(path, resolvedpath)) return -1; /* we can exec the command directly instead of via pfexec(1) if */ /* there is a matching entry without attributes in exec_attr(4) */ if (sh.user && *sh.user) { execattr_t *pf; if(pf=getexecuser(sh.user, KV_COMMAND, resolvedpath, GET_ONE)) { if (!pf->attr || pf->attr->length == 0) { int r = execve(path, argv, envp); free_execattr(pf); return r; } free_execattr(pf); } else { errno = ENOENT; return -1; } } --argv; argv[0] = argv[1]; argv[1] = resolvedpath; return(execve("/usr/bin/pfexec", argv, envp)); #else return(execve(path, argv, envp)); #endif } static pid_t _spawnveg(const char *path, char* const argv[], char* const envp[], pid_t pgid) { int waitsafe = job.waitsafe; pid_t pid; job_lock(); while(1) { sh_stats(STAT_SPAWN); pid = spawnveg(path,argv,envp,pgid); if(pid>=0 || errno!=EAGAIN) break; _sh_fork(pid, 0, (int*)0); } job.waitsafe = waitsafe; job_unlock(); return(pid); } /* * used with command -x to run the command in multiple passes * spawn is non-zero when invoked via spawn * the exitval is set to the maximum for each execution */ static pid_t path_xargs(const char *path, char *argv[],char *const envp[], int spawn) { register char *cp, **av, **xv; char **avlast= &argv[sh.xargmax], **saveargs=0; char *const *ev; long size, left; int nlast=1,n,exitval=0; pid_t pid; if(sh.xargmin < 0) return((pid_t)-1); size = sh.lim.arg_max-1024; for(ev=envp; cp= *ev; ev++) size -= strlen(cp)-1; for(av=argv; (cp= *av) && av< &argv[sh.xargmin]; av++) size -= strlen(cp)-1; for(av=avlast; cp= *av; av++,nlast++) size -= strlen(cp)-1; av = &argv[sh.xargmin]; if(!spawn) job_clear(); sh.exitval = 0; while(av0 && avexitval) exitval = sh.exitval; if(saveargs) { memcpy((void*)av,saveargs,n); free((void*)saveargs); saveargs = 0; } } else if(spawn && !sh_isoption(SH_PFSH)) { sh.xargexit = exitval; return(_spawnveg(path,argv,envp,spawn>>1)); } else return(path_pfexecve(path,argv,envp,spawn)); } if(!spawn) exit(exitval); return((pid_t)-1); } /* * make sure PWD is set up correctly * Return the present working directory * Invokes getcwd() if flag==0 and if necessary * Sets the PWD variable to this value */ char *path_pwd(int flag) { register char *cp; register char *dfault = (char*)e_dot; register int count = 0; Shell_t *shp = &sh; if(shp->pwd) return((char*)shp->pwd); while(1) { /* try from lowest to highest */ switch(count++) { case 0: cp = nv_getval(PWDNOD); break; case 1: cp = nv_getval(HOME); break; case 2: cp = "/"; break; case 3: cp = (char*)e_crondir; if(flag) /* skip next case when non-zero flag */ ++count; break; case 4: { if(cp=getcwd(NIL(char*),0)) { nv_offattr(PWDNOD,NV_NOFREE); nv_unset(PWDNOD); PWDNOD->nvalue.cp = cp; goto skip; } break; } case 5: return(dfault); } if(cp && *cp=='/' && test_inode(cp,e_dot)) break; } if(count>1) { nv_offattr(PWDNOD,NV_NOFREE); nv_putval(PWDNOD,cp,NV_RDONLY); } skip: nv_onattr(PWDNOD,NV_NOFREE|NV_EXPORT); shp->pwd = (char*)(PWDNOD->nvalue.cp); return(cp); } static void free_bltin(Namval_t *np,void *data) { register Pathcomp_t *pp= (Pathcomp_t*)data; if(pp->flags&PATH_STD_DIR) { int offset=staktell();; if(strcmp(pp->name,"/bin")==0 || memcmp(pp->name,np->nvname,pp->len) || np->nvname[pp->len]!='/') return; stakputs("/bin"); stakputs(np->nvname+pp->len+1); stakputc(0); sh_addbuiltin(stakptr(offset),np->nvalue.bfp,NiL); stakseek(offset); return; } if((void*)np->nvenv==pp->bltin_lib) nv_delete(np,sh_bltin_tree(),NV_NOFREE); } /* * delete current Pathcomp_t structure */ void path_delete(Pathcomp_t *first) { register Pathcomp_t *pp=first, *old=0, *ppnext; while(pp) { ppnext = pp->next; if(--pp->refcount<=0) { if(pp->lib) free((void*)pp->lib); if(pp->blib) free((void*)pp->blib); if(pp->bltin_lib || (pp->flags&PATH_STD_DIR)) { nv_scan(sh_bltin_tree(),free_bltin,pp,0,0); #if SHOPT_DYNAMIC if(pp->bltin_lib) dlclose(pp->bltin_lib); #endif /* SHOPT_DYNAMIC */ } free((void*)pp); if(old) old->next = ppnext; } else old = pp; pp = ppnext; } } /* * returns library variable from .paths * The value might be returned on the stack overwriting path */ static char *path_lib(Pathcomp_t *pp, char *path) { register char *last = strrchr(path,'/'); register int r; struct stat statb; if(last) *last = 0; else path = "."; r = stat(path,&statb); if(last) *last = '/'; if(r>=0) { Pathcomp_t pcomp; char save[8]; for( ;pp; pp=pp->next) { path_checkdup(pp); if(pp->ino==statb.st_ino && pp->dev==statb.st_dev && pp->mtime==statb.st_mtime) return(pp->lib); } pcomp.len = 0; if(last) pcomp.len = last-path; memcpy((void*)save, (void*)stakptr(PATH_OFFSET+pcomp.len),sizeof(save)); if(path_chkpaths((Pathcomp_t*)0,(Pathcomp_t*)0,&pcomp,PATH_OFFSET)) return(stakfreeze(1)); memcpy((void*)stakptr(PATH_OFFSET+pcomp.len),(void*)save,sizeof(save)); } return(0); } #if 0 void path_dump(register Pathcomp_t *pp) { sfprintf(sfstderr,"dump\n"); while(pp) { sfprintf(sfstderr,"pp=%x dev=%d ino=%d len=%d flags=%o name=%.*s\n", pp,pp->dev,pp->ino,pp->len,pp->flags,pp->len,pp->name); pp = pp->next; } } #endif /* * check for duplicate directories on PATH */ static void path_checkdup(register Pathcomp_t *pp) { register char *name = pp->name; register Pathcomp_t *oldpp,*first; register int flag=0; struct stat statb; if(stat(name,&statb)<0 || !S_ISDIR(statb.st_mode)) { pp->flags |= PATH_SKIP; pp->dev = *name=='/'; return; } pp->mtime = statb.st_mtime; pp->ino = statb.st_ino; pp->dev = statb.st_dev; if(*name=='/' && onstdpath(name)) flag = PATH_STD_DIR; first = (pp->flags&PATH_CDPATH)?pp->shp->cdpathlist:path_get(""); for(oldpp=first; oldpp && oldpp!=pp; oldpp=oldpp->next) { if(pp->ino==oldpp->ino && pp->dev==oldpp->dev && pp->mtime==oldpp->mtime) { flag |= PATH_SKIP; break; } } pp->flags |= flag; if(((pp->flags&(PATH_PATH|PATH_SKIP))==PATH_PATH)) { int offset = staktell(); stakputs(name); path_chkpaths(first,0,pp,offset); stakseek(offset); } } /* * write the next path to search on the current stack * if last is given, all paths that come before are skipped * the next pathcomp is returned. */ Pathcomp_t *path_nextcomp(register Pathcomp_t *pp, const char *name, Pathcomp_t *last) { Pathcomp_t *ppnext; stakseek(PATH_OFFSET); if(*name=='/') pp = 0; else { for(;pp && pp!=last;pp=ppnext) { if(ppnext=pp->next) ppnext->shp = pp->shp; if(!pp->dev && !pp->ino) path_checkdup(pp); if(pp->flags&PATH_SKIP) continue; if(!last || *pp->name!='/') break; } if(!pp) /* this should not happen */ pp = last; } if(pp && (pp->name[0]!='.' || pp->name[1])) { if(*pp->name!='/') { stakputs(path_pwd(1)); if(*stakptr(staktell()-1)!='/') stakputc('/'); } stakwrite(pp->name,pp->len); if(pp->name[pp->len-1]!='/') stakputc('/'); } stakputs(name); stakputc(0); while(pp && pp!=last && (pp=pp->next)) { if(!(pp->flags&PATH_SKIP)) return(pp); } return((Pathcomp_t*)0); } static Pathcomp_t* defpath_init(Shell_t *shp) { Pathcomp_t *pp = (void*)path_addpath((Pathcomp_t*)0,(std_path),PATH_PATH); if(shp->defpathlist = (void*)pp) pp->shp = shp; return(pp); } static void path_init(Shell_t *shp) { const char *val; Pathcomp_t *pp; if(!std_path && !(std_path=astconf("PATH",NIL(char*),NIL(char*)))) std_path = e_defpath; if(val=sh_scoped(shp,(PATHNOD))->nvalue.cp) { pp = (void*)path_addpath((Pathcomp_t*)shp->pathlist,val,PATH_PATH); if(shp->pathlist = (void*)pp) pp->shp = shp; } else { if(!(pp=(Pathcomp_t*)shp->defpathlist)) pp = defpath_init(shp); shp->pathlist = (void*)path_dup(pp); } if(val=sh_scoped(shp,(FPATHNOD))->nvalue.cp) { pp = (void*)path_addpath((Pathcomp_t*)shp->pathlist,val,PATH_FPATH); if(shp->pathlist = (void*)pp) pp->shp = shp; } } /* * returns that pathlist to search */ Pathcomp_t *path_get(register const char *name) { register Shell_t *shp = &sh; register Pathcomp_t *pp=0; if(*name && strchr(name,'/')) return(0); if(!sh_isstate(SH_DEFPATH)) { if(!shp->pathlist) path_init(shp); pp = (Pathcomp_t*)shp->pathlist; } if(!pp && (!(PATHNOD)->nvalue.cp) || sh_isstate(SH_DEFPATH)) { if(!(pp=(Pathcomp_t*)shp->defpathlist)) pp = defpath_init(shp); } return(pp); } /* * open file corresponding to name using path give by */ static int path_opentype(const char *name, register Pathcomp_t *pp, int fun) { register int fd= -1; struct stat statb; Pathcomp_t *oldpp; Shell_t *shp; if(pp) shp = pp->shp; else { shp = sh_getinterp(); if(!shp->pathlist) path_init(shp); } if(!fun && strchr(name,'/')) { if(sh_isoption(SH_RESTRICTED)) errormsg(SH_DICT,ERROR_exit(1),e_restricted,name); } do { pp = path_nextcomp(oldpp=pp,name,0); while(oldpp && (oldpp->flags&PATH_SKIP)) oldpp = oldpp->next; if(fun && (!oldpp || !(oldpp->flags&PATH_FPATH))) continue; if((fd = sh_open(path_relative(stakptr(PATH_OFFSET)),O_RDONLY,0)) >= 0) { if(fstat(fd,&statb)<0 || S_ISDIR(statb.st_mode)) { errno = EISDIR; sh_close(fd); fd = -1; } } } while( fd<0 && pp); if(fd>=0 && (fd = sh_iomovefd(fd)) > 0) { fcntl(fd,F_SETFD,FD_CLOEXEC); if(!shp) { shp = sh_getinterp(); #if _UWIN close(0x10001); /* this results in a /var/log/uwin message with "0x10001" for debugging */ #endif } shp->fdstatus[fd] |= IOCLEX; } return(fd); } /* * open file corresponding to name using path give by */ int path_open(const char *name, register Pathcomp_t *pp) { return(path_opentype(name,pp,0)); } /* * given a pathname return the base name */ char *path_basename(register const char *name) { register const char *start = name; while (*name) if ((*name++ == '/') && *name) /* don't trim trailing / */ start = name; return ((char*)start); } char *path_fullname(const char *name) { int len=strlen(name)+1,dirlen=0; char *path,*pwd; if(*name!='/') { pwd = path_pwd(1); dirlen = strlen(pwd)+1; } path = (char*)malloc(len+dirlen); if(dirlen) { memcpy((void*)path,(void*)pwd,dirlen); path[dirlen-1] = '/'; } memcpy((void*)&path[dirlen],(void*)name,len); pathcanon(path,0); return(path); } /* * load functions from file */ static void funload(Shell_t *shp,int fno, const char *name) { char *pname,*oldname=shp->st.filename, buff[IOBSIZE+1]; Namval_t *np; struct Ufunction *rp; int savestates = sh_getstate(), oldload=shp->funload; pname = path_fullname(stakptr(PATH_OFFSET)); if(shp->fpathdict && (rp = dtmatch(shp->fpathdict,(void*)pname))) { Dt_t *funtree = sh_subfuntree(1); do { if((np = dtsearch(funtree,rp->np)) && is_afunction(np)) { if(np->nvalue.rp) np->nvalue.rp->fdict = 0; nv_delete(np,funtree,NV_NOFREE); } dtinsert(funtree,rp->np); rp->fdict = funtree; } while((rp=dtnext(shp->fpathdict,rp)) && strcmp(pname,rp->fname)==0); return; } sh_onstate(SH_NOLOG); sh_onstate(SH_NOALIAS); shp->readscript = (char*)name; shp->st.filename = pname; shp->funload = 1; error_info.line = 0; sh_eval(sfnew(NIL(Sfio_t*),buff,IOBSIZE,fno,SF_READ),SH_FUNEVAL); shp->readscript = 0; free((void*)shp->st.filename); shp->funload = oldload; shp->st.filename = oldname; sh_setstate(savestates); } /* * do a path search and track alias if requested * if flag is 0, or if name not found, then try autoloading function * if flag==2 or 3, returns 1 if name found on FPATH * if flag==3 no tracked alias will be set * returns 1, if function was autoloaded. * If oldpp is not NULL, it will contain a pointer to the path component * where it was found. */ int path_search(register const char *name,Pathcomp_t **oldpp, int flag) { register Namval_t *np; register int fno; Pathcomp_t *pp=0; Shell_t *shp = &sh; if(name && strchr(name,'/')) { stakseek(PATH_OFFSET); stakputs(name); if(canexecute(stakptr(PATH_OFFSET),0)<0) { *stakptr(PATH_OFFSET) = 0; return(0); } if(*name=='/') return(1); stakseek(PATH_OFFSET); stakputs(path_pwd(1)); stakputc('/'); stakputs(name); stakputc(0); return(0); } if(sh_isstate(SH_DEFPATH)) { if(!shp->defpathlist) defpath_init(shp); } else if(!shp->pathlist) path_init(shp); if(flag) { if((np=nv_search(name,shp->track_tree,0)) && !nv_isattr(np,NV_NOALIAS) && (pp=(Pathcomp_t*)np->nvalue.cp)) { stakseek(PATH_OFFSET); path_nextcomp(pp,name,pp); stakputc(0); return(0); } pp = path_absolute(name,oldpp?*oldpp:NIL(Pathcomp_t*)); if(oldpp) *oldpp = pp; if(!pp && (np=nv_search(name,shp->fun_tree,HASH_NOSCOPE))&&np->nvalue.ip) return(1); if(!pp) *stakptr(PATH_OFFSET) = 0; } if(flag==0 || !pp || (pp->flags&PATH_FPATH)) { if(!pp) pp=sh_isstate(SH_DEFPATH)?shp->defpathlist:shp->pathlist; if(pp && strmatch(name,e_alphanum) && (fno=path_opentype(name,pp,1))>=0) { if(flag==2) { sh_close(fno); return(1); } funload(shp,fno,name); return(1); } *stakptr(PATH_OFFSET) = 0; return(0); } else if(pp && !sh_isstate(SH_DEFPATH) && *name!='/' && flag<3) { if(np=nv_search(name,shp->track_tree,NV_ADD)) path_alias(np,pp); } return(0); } /* * do a path search and find the full pathname of file name */ Pathcomp_t *path_absolute(register const char *name, Pathcomp_t *pp) { register int f,isfun; int noexec=0; Pathcomp_t *oldpp; Shell_t *shp = &sh; Namval_t *np; shp->path_err = ENOENT; if(!pp && !(pp=path_get(""))) return(0); shp->path_err = 0; while(1) { sh_sigcheck(); isfun = (pp->flags&PATH_FPATH); if(oldpp=pp) { pp = path_nextcomp(pp,name,0); while(oldpp->flags&PATH_SKIP) { if(!(oldpp=oldpp->next)) { shp->path_err = ENOENT; return(0); } } } if(!isfun && !sh_isoption(SH_RESTRICTED)) { if(*stakptr(PATH_OFFSET)=='/' && nv_search(stakptr(PATH_OFFSET),sh.bltin_tree,0)) return(oldpp); #if SHOPT_DYNAMIC if(oldpp->blib) { typedef int (*Fptr_t)(int, char*[], void*); Fptr_t addr; int n = staktell(); int libcmd; char *cp; stakputs("b_"); stakputs(name); stakputc(0); if(!oldpp->bltin_lib) { if(cp = strrchr(oldpp->blib,'/')) cp++; else cp = oldpp->blib; if((libcmd = !strcmp(cp,LIBCMD)) && (addr=(Fptr_t)dlllook((void*)0,stakptr(n)))) { if((np = sh_addbuiltin(stakptr(PATH_OFFSET),addr,NiL)) && nv_isattr(np,NV_BLTINOPT)) return(oldpp); } #if (_AST_VERSION>=20040404) if (oldpp->bltin_lib = dllplug(SH_ID, oldpp->blib, NiL, RTLD_LAZY, NiL, 0)) #else if (oldpp->bltin_lib = dllfind(oldpp->blib, NiL, RTLD_LAZY, NiL, 0)) #endif { /* * this detects the 2007-05-11 builtin context change and also * the 2008-03-30 opt_info.num change that hit libcmd::b_head */ if (libcmd && !dlllook(oldpp->bltin_lib, "b_pids")) { dlclose(oldpp->bltin_lib); oldpp->bltin_lib = 0; oldpp->blib = 0; } else sh_addlib(oldpp->bltin_lib); } } if((addr=(Fptr_t)dlllook(oldpp->bltin_lib,stakptr(n))) && (!(np = sh_addbuiltin(stakptr(PATH_OFFSET),NiL,NiL)) || np->nvalue.bfp!=addr) && (np = sh_addbuiltin(stakptr(PATH_OFFSET),addr,NiL))) { np->nvenv = oldpp->bltin_lib; return(oldpp); } } #endif /* SHOPT_DYNAMIC */ } sh_stats(STAT_PATHS); f = canexecute(stakptr(PATH_OFFSET),isfun); if(isfun && f>=0) { nv_onattr(nv_open(name,sh_subfuntree(1),NV_NOARRAY|NV_IDENT|NV_NOSCOPE),NV_LTOU|NV_FUNCTION); funload(shp,f,name); close(f); f = -1; return(0); } else if(f>=0 && (oldpp->flags & PATH_STD_DIR)) { int n = staktell(); stakputs("/bin/"); stakputs(name); stakputc(0); np = nv_search(stakptr(n),sh.bltin_tree,0); stakseek(n); if(np) { n = np->nvflag; np = sh_addbuiltin(stakptr(PATH_OFFSET),np->nvalue.bfp,nv_context(np)); np->nvflag = n; } } if(!pp || f>=0) break; if(errno!=ENOENT) noexec = errno; } if(f<0) { shp->path_err = (noexec?noexec:ENOENT); return(0); } stakputc(0); return(oldpp); } /* * returns 0 if path can execute * sets exec_err if file is found but can't be executable */ #undef S_IXALL #ifdef S_IXUSR # define S_IXALL (S_IXUSR|S_IXGRP|S_IXOTH) #else # ifdef S_IEXEC # define S_IXALL (S_IEXEC|(S_IEXEC>>3)|(S_IEXEC>>6)) # else # define S_IXALL 0111 # endif /*S_EXEC */ #endif /* S_IXUSR */ static int canexecute(register char *path, int isfun) { struct stat statb; register int fd=0; path = path_relative(path); if(isfun) { if((fd=open(path,O_RDONLY,0))<0 || fstat(fd,&statb)<0) goto err; } else if(stat(path,&statb) < 0) { #if _WINIX /* check for .exe or .bat suffix */ char *cp; if(errno==ENOENT && (!(cp=strrchr(path,'.')) || strlen(cp)>4 || strchr(cp,'/'))) { int offset = staktell()-1; stakseek(offset); stakputs(".bat"); path = stakptr(PATH_OFFSET); if(stat(path,&statb) < 0) { if(errno!=ENOENT) goto err; memcpy(stakptr(offset),".sh",4); if(stat(path,&statb) < 0) goto err; } } else #endif /* _WINIX */ goto err; } errno = EPERM; if(S_ISDIR(statb.st_mode)) errno = EISDIR; else if((statb.st_mode&S_IXALL)==S_IXALL || sh_access(path,X_OK)>=0) return(fd); if(isfun && fd>=0) sh_close(fd); err: return(-1); } /* * Return path relative to present working directory */ char *path_relative(register const char* file) { register const char *pwd; register const char *fp = file; /* can't relpath when sh.pwd not set */ if(!(pwd=sh.pwd)) return((char*)fp); while(*pwd==*fp) { if(*pwd++==0) return((char*)e_dot); fp++; } if(*pwd==0 && *fp == '/') { while(*++fp=='/'); if(*fp) return((char*)fp); return((char*)e_dot); } return((char*)file); } void path_exec(register const char *arg0,register char *argv[],struct argnod *local) { char **envp; const char *opath; Pathcomp_t *libpath, *pp=0; Shell_t *shp = &sh; int slash=0; nv_setlist(local,NV_EXPORT|NV_IDENT|NV_ASSIGN,0); envp = sh_envgen(); if(strchr(arg0,'/')) { slash=1; /* name containing / not allowed for restricted shell */ if(sh_isoption(SH_RESTRICTED)) errormsg(SH_DICT,ERROR_exit(1),e_restricted,arg0); } else pp=path_get(arg0); shp->path_err= ENOENT; sfsync(NIL(Sfio_t*)); timerdel(NIL(void*)); /* find first path that has a library component */ while(pp && (pp->flags&PATH_SKIP)) pp = pp->next; if(pp || slash) do { sh_sigcheck(); if(libpath=pp) { pp = path_nextcomp(pp,arg0,0); opath = stakfreeze(1)+PATH_OFFSET; } else opath = arg0; path_spawn(opath,argv,envp,libpath,0); while(pp && (pp->flags&PATH_FPATH)) pp = path_nextcomp(pp,arg0,0); } while(pp); /* force an exit */ ((struct checkpt*)shp->jmplist)->mode = SH_JMPEXIT; if((errno=shp->path_err)==ENOENT) errormsg(SH_DICT,ERROR_exit(ERROR_NOENT),e_found,arg0); else errormsg(SH_DICT,ERROR_system(ERROR_NOEXEC),e_exec,arg0); } pid_t path_spawn(const char *opath,register char **argv, char **envp, Pathcomp_t *libpath, int spawn) { Shell_t *shp = sh_getinterp(); register char *path; char **xp=0, *xval, *libenv = (libpath?libpath->lib:0); Namval_t* np; char *s, *v; int r, n, pidsize; pid_t pid= -1; /* leave room for inserting _= pathname in environment */ envp--; #if _lib_readlink /* save original pathname */ stakseek(PATH_OFFSET); pidsize = sfprintf(stkstd,"*%d*",spawn?getpid():getppid()); stakputs(opath); opath = stakfreeze(1)+PATH_OFFSET+pidsize; np=nv_search(argv[0],shp->track_tree,0); while(libpath && !libpath->lib) libpath=libpath->next; if(libpath && (!np || nv_size(np)>0)) { /* check for symlink and use symlink name */ char buff[PATH_MAX+1]; char save[PATH_MAX+1]; stakseek(PATH_OFFSET); stakputs(opath); path = stakptr(PATH_OFFSET); while((n=readlink(path,buff,PATH_MAX))>0) { buff[n] = 0; n = PATH_OFFSET; r = 0; if((v=strrchr(path,'/')) && *buff!='/') { if(buff[0]=='.' && buff[1]=='.' && (r = strlen(path) + 1) <= PATH_MAX) memcpy(save, path, r); else r = 0; n += (v+1-path); } stakseek(n); stakputs(buff); stakputc(0); path = stakptr(PATH_OFFSET); if(v && buff[0]=='.' && buff[1]=='.') { pathcanon(path, 0); if(r && access(path,X_OK)) { memcpy(path, save, r); break; } } if(libenv = path_lib(libpath,path)) break; } stakseek(0); } #endif if(libenv && (v = strchr(libenv,'='))) { n = v - libenv; *v = 0; np = nv_open(libenv,shp->var_tree,0); *v = '='; s = nv_getval(np); stakputs(libenv); if(s) { stakputc(':'); stakputs(s); } v = stakfreeze(1); r = 1; xp = envp + 1; while (s = *xp++) { if (strneq(s, v, n) && s[n] == '=') { xval = *--xp; *xp = v; r = 0; break; } } if (r) { *envp-- = v; xp = 0; } } if(!opath) opath = stakptr(PATH_OFFSET); envp[0] = (char*)opath-(PATH_OFFSET+pidsize); envp[0][0] = '_'; envp[0][1] = '='; sfsync(sfstderr); sh_sigcheck(); path = path_relative(opath); #ifdef SHELLMAGIC if(*path!='/' && path!=opath) { /* * The following code because execv(foo,) and execv(./foo,) * may not yield the same results */ char *sp = (char*)malloc(strlen(path)+3); sp[0] = '.'; sp[1] = '/'; strcpy(sp+2,path); path = sp; } #endif /* SHELLMAGIC */ if(spawn && !sh_isoption(SH_PFSH)) pid = _spawnveg(opath, &argv[0],envp, spawn>>1); else pid = path_pfexecve(opath, &argv[0] ,envp,spawn); if(xp) *xp = xval; #ifdef SHELLMAGIC if(*path=='.' && path!=opath) { free(path); path = path_relative(opath); } #endif /* SHELLMAGIC */ if(pid>0) return(pid); retry: switch(sh.path_err = errno) { #ifdef apollo /* * On apollo's execve will fail with eacces when * file has execute but not read permissions. So, * for now we will pretend that EACCES and ENOEXEC * mean the same thing. */ case EACCES: #endif /* apollo */ case ENOEXEC: #if SHOPT_SUID_EXEC case EPERM: /* some systems return EPERM if setuid bit is on */ #endif errno = ENOEXEC; if(spawn) { #ifdef _lib_fork if(sh.subshell) return(-1); do { if((pid=fork())>0) return(pid); } while(_sh_fork(pid,0,(int*)0) < 0); ((struct checkpt*)shp->jmplist)->mode = SH_JMPEXIT; #else return(-1); #endif } exscript(shp,path,argv,envp); #ifndef apollo case EACCES: { struct stat statb; if(stat(path,&statb)>=0) { if(S_ISDIR(statb.st_mode)) errno = EISDIR; #ifdef S_ISSOCK if(S_ISSOCK(statb.st_mode)) exscript(shp,path,argv,envp); #endif } } /* FALL THROUGH */ #endif /* !apollo */ #ifdef ENAMETOOLONG case ENAMETOOLONG: #endif /* ENAMETOOLONG */ #if !SHOPT_SUID_EXEC case EPERM: #endif shp->path_err = errno; return(-1); case ENOTDIR: case ENOENT: case EINTR: #ifdef EMLINK case EMLINK: #endif /* EMLINK */ return(-1); case E2BIG: if(sh.xargmin) { pid = path_xargs(opath, &argv[0] ,envp,spawn); if(pid<0) goto retry; return(pid); } default: errormsg(SH_DICT,ERROR_system(ERROR_NOEXEC),e_exec,path); } return 0; } /* * File is executable but not machine code. * Assume file is a Shell script and execute it. */ static void exscript(Shell_t *shp,register char *path,register char *argv[],char **envp) { register Sfio_t *sp; path = path_relative(path); shp->comdiv=0; shp->bckpid = 0; shp->st.ioset=0; /* clean up any cooperating processes */ if(shp->cpipe[0]>0) sh_pclose(shp->cpipe); if(shp->cpid && shp->outpipe) sh_close(*shp->outpipe); shp->cpid = 0; if(sp=fcfile()) while(sfstack(sp,SF_POPSTACK)); job_clear(); if(shp->infd>0 && (shp->fdstatus[shp->infd]&IOCLEX)) sh_close(shp->infd); sh_setstate(sh_state(SH_FORKED)); sfsync(sfstderr); #if SHOPT_SUID_EXEC && !SHOPT_PFSH /* check if file cannot open for read or script is setuid/setgid */ { static char name[] = "/tmp/euidXXXXXXXXXX"; register int n; register uid_t euserid; char *savet=0; struct stat statb; if((n=sh_open(path,O_RDONLY,0)) >= 0) { /* move if n=0,1,2 */ n = sh_iomovefd(n); if(fstat(n,&statb)>=0 && !(statb.st_mode&(S_ISUID|S_ISGID))) goto openok; sh_close(n); } if((euserid=geteuid()) != shp->userid) { strncpy(name+9,fmtbase((long)getpid(),10,0),sizeof(name)-10); /* create a suid open file with owner equal effective uid */ if((n=open(name,O_CREAT|O_TRUNC|O_WRONLY,S_ISUID|S_IXUSR)) < 0) goto fail; unlink(name); /* make sure that file has right owner */ if(fstat(n,&statb)<0 || statb.st_uid != euserid) goto fail; if(n!=10) { sh_close(10); fcntl(n, F_DUPFD, 10); sh_close(n); n=10; } } savet = *--argv; *argv = path; path_pfexecve(e_suidexec,argv,envp,0); fail: /* * The following code is just for compatibility */ if((n=open(path,O_RDONLY,0)) < 0) errormsg(SH_DICT,ERROR_system(ERROR_NOEXEC),e_exec,path); if(savet) *argv++ = savet; openok: shp->infd = n; } #else if((shp->infd = sh_open(path,O_RDONLY,0)) < 0) errormsg(SH_DICT,ERROR_system(ERROR_NOEXEC),e_exec,path); #endif shp->infd = sh_iomovefd(shp->infd); #if SHOPT_ACCT sh_accbegin(path) ; /* reset accounting */ #endif /* SHOPT_ACCT */ shp->arglist = sh_argcreate(argv); shp->lastarg = strdup(path); /* save name of calling command */ shp->readscript = error_info.id; /* close history file if name has changed */ if(shp->hist_ptr && (path=nv_getval(HISTFILE)) && strcmp(path,shp->hist_ptr->histname)) { hist_close(shp->hist_ptr); (HISTCUR)->nvalue.lp = 0; } sh_offstate(SH_FORKED); if(shp->sigflag[SIGCHLD]==SH_SIGOFF) shp->sigflag[SIGCHLD] = SH_SIGFAULT; siglongjmp(*shp->jmplist,SH_JMPSCRIPT); } #if SHOPT_ACCT # include # include "FEATURE/time" static struct acct sabuf; static struct tms buffer; static clock_t before; static char *SHACCT; /* set to value of SHACCT environment variable */ static shaccton; /* non-zero causes accounting record to be written */ static int compress(time_t); /* * initialize accounting, i.e., see if SHACCT variable set */ void sh_accinit(void) { SHACCT = getenv("SHACCT"); } /* * suspend accounting until turned on by sh_accbegin() */ void sh_accsusp(void) { shaccton=0; #ifdef AEXPAND sabuf.ac_flag |= AEXPND; #endif /* AEXPAND */ } /* * begin an accounting record by recording start time */ void sh_accbegin(const char *cmdname) { if(SHACCT) { sabuf.ac_btime = time(NIL(time_t *)); before = times(&buffer); sabuf.ac_uid = getuid(); sabuf.ac_gid = getgid(); strncpy(sabuf.ac_comm, (char*)path_basename(cmdname), sizeof(sabuf.ac_comm)); shaccton = 1; } } /* * terminate an accounting record and append to accounting file */ void sh_accend(void) { int fd; clock_t after; if(shaccton) { after = times(&buffer); sabuf.ac_utime = compress(buffer.tms_utime + buffer.tms_cutime); sabuf.ac_stime = compress(buffer.tms_stime + buffer.tms_cstime); sabuf.ac_etime = compress( (time_t)(after-before)); fd = open( SHACCT , O_WRONLY | O_APPEND | O_CREAT,RW_ALL); write(fd, (const char*)&sabuf, sizeof( sabuf )); close( fd); } } /* * Produce a pseudo-floating point representation * with 3 bits base-8 exponent, 13 bits fraction. */ static int compress(register time_t t) { register int exp = 0, rund = 0; while (t >= 8192) { exp++; rund = t&04; t >>= 3; } if (rund) { t++; if (t >= 8192) { t >>= 3; exp++; } } return((exp<<13) + t); } #endif /* SHOPT_ACCT */ /* * add a pathcomponent to the path search list and eliminate duplicates * and non-existing absolute paths. */ static Pathcomp_t *path_addcomp(Pathcomp_t *first, Pathcomp_t *old,const char *name, int flag) { register Pathcomp_t *pp, *oldpp; int len, offset=staktell(); if(!(flag&PATH_BFPATH)) { register const char *cp = name; while(*cp && *cp!=':') stakputc(*cp++); len = staktell()-offset; stakputc(0); stakseek(offset); name = (const char*)stakptr(offset); } else len = strlen(name); for(pp=first; pp; pp=pp->next) { if(memcmp(name,pp->name,len)==0 && (pp->name[len]==':' || pp->name[len]==0)) { pp->flags |= flag; return(first); } } for(pp=first, oldpp=0; pp; oldpp=pp, pp=pp->next); pp = newof((Pathcomp_t*)0,Pathcomp_t,1,len+1); pp->refcount = 1; memcpy((char*)(pp+1),name,len+1); pp->name = (char*)(pp+1); pp->len = len; if(oldpp) oldpp->next = pp; else first = pp; pp->flags = flag; if(strcmp(name,SH_CMDLIB_DIR)==0) { pp->dev = 1; pp->flags |= PATH_BUILTIN_LIB; pp->blib = malloc(4); strcpy(pp->blib,LIBCMD); return(first); } if(old && ((flag&(PATH_PATH|PATH_SKIP))==PATH_PATH)) path_chkpaths(first,old,pp,offset); return(first); } /* * This function checks for the .paths file in directory in * it assumes that the directory is on the stack at */ static int path_chkpaths(Pathcomp_t *first, Pathcomp_t* old,Pathcomp_t *pp, int offset) { struct stat statb; int k,m,n,fd; char *sp,*cp,*ep; stakseek(offset+pp->len); if(pp->len==1 && *stakptr(offset)=='/') stakseek(offset); stakputs("/.paths"); if((fd=open(stakptr(offset),O_RDONLY))>=0) { fstat(fd,&statb); n = statb.st_size; stakseek(offset+pp->len+n+2); sp = stakptr(offset+pp->len); *sp++ = '/'; n=read(fd,cp=sp,n); sp[n] = 0; close(fd); for(ep=0; n--; cp++) { if(*cp=='=') { ep = cp+1; continue; } else if(*cp!='\r' && *cp!='\n') continue; if(*sp=='#' || sp==cp) { sp = cp+1; continue; } *cp = 0; m = ep ? (ep-sp) : 0; if(!m || m==6 && memcmp((void*)sp,(void*)"FPATH=",6)==0) { if(first) { char *ptr = stakptr(offset+pp->len+1); if(ep) strcpy(ptr,ep); path_addcomp(first,old,stakptr(offset),PATH_FPATH|PATH_BFPATH); } } else if(m==12 && memcmp((void*)sp,(void*)"BUILTIN_LIB=",12)==0) { if(!(pp->flags & PATH_BUILTIN_LIB)) { pp->flags |= PATH_BUILTIN_LIB; if (*ep == '.' && !*(ep + 1)) pp->flags |= PATH_STD_DIR; else { k = strlen(ep)+1; if (*ep != '/') k += pp->len+1; pp->blib = sp = malloc(k); if (*ep != '/') { strcpy(pp->blib,pp->name); sp += pp->len; *sp++ = '/'; } strcpy(sp,ep); } } } else if(m) { pp->lib = (char*)malloc(cp-sp+pp->len+2); memcpy((void*)pp->lib,(void*)sp,m); memcpy((void*)&pp->lib[m],stakptr(offset),pp->len); pp->lib[k=m+pp->len] = '/'; strcpy((void*)&pp->lib[k+1],ep); pathcanon(&pp->lib[m],0); if(!first) { stakseek(0); stakputs(pp->lib); free((void*)pp->lib); return(1); } } sp = cp+1; ep = 0; } } return(0); } Pathcomp_t *path_addpath(Pathcomp_t *first, register const char *path,int type) { register const char *cp; Pathcomp_t *old=0; int offset = staktell(); char *savptr; if(!path && type!=PATH_PATH) return(first); if(type!=PATH_FPATH) { old = first; first = 0; } if(offset) savptr = stakfreeze(0); if(path) while(*(cp=path)) { if(*cp==':') { if(type!=PATH_FPATH) first = path_addcomp(first,old,".",type); while(*++path == ':'); } else { int c; while(*path && *path!=':') path++; c = *path++; first = path_addcomp(first,old,cp,type); if(c==0) break; if(*path==0) path--; } } if(old) { if(!first && !path) { Pathcomp_t *pp = (Pathcomp_t*)old->shp->defpathlist; if(!pp) pp = defpath_init(old->shp); first = path_dup(pp); } if(cp=(FPATHNOD)->nvalue.cp) first = (void*)path_addpath((Pathcomp_t*)first,cp,PATH_FPATH); path_delete(old); } if(offset) stakset(savptr,offset); else stakseek(0); return(first); } /* * duplicate the path give by by incremented reference counts */ Pathcomp_t *path_dup(Pathcomp_t *first) { register Pathcomp_t *pp=first; while(pp) { pp->refcount++; pp = pp->next; } return(first); } /* * called whenever the directory is changed */ void path_newdir(Pathcomp_t *first) { register Pathcomp_t *pp=first, *next, *pq; struct stat statb; for(pp=first; pp; pp=pp->next) { pp->flags &= ~PATH_SKIP; if(*pp->name=='/') continue; /* delete .paths component */ if((next=pp->next) && (next->flags&PATH_BFPATH)) { pp->next = next->next; if(--next->refcount<=0) free((void*)next); } if(stat(pp->name,&statb)<0 || !S_ISDIR(statb.st_mode)) { pp->dev = 0; pp->ino = 0; continue; } pp->dev = statb.st_dev; pp->ino = statb.st_ino; pp->mtime = statb.st_mtime; for(pq=first;pq!=pp;pq=pq->next) { if(pp->ino==pq->ino && pp->dev==pq->dev) pp->flags |= PATH_SKIP; } for(pq=pp;pq=pq->next;) { if(pp->ino==pq->ino && pp->dev==pq->dev) pq->flags |= PATH_SKIP; } if((pp->flags&(PATH_PATH|PATH_SKIP))==PATH_PATH) { /* try to insert .paths component */ int offset = staktell(); stakputs(pp->name); stakseek(offset); next = pp->next; pp->next = 0; path_chkpaths(first,(Pathcomp_t*)0,pp,offset); if(pp->next) pp = pp->next; pp->next = next; } } #if 0 path_dump(first); #endif } Pathcomp_t *path_unsetfpath(Pathcomp_t *first) { register Pathcomp_t *pp=first, *old=0; Shell_t *shp = &sh; if(shp->fpathdict) { struct Ufunction *rp, *rpnext; for(rp=(struct Ufunction*)dtfirst(shp->fpathdict);rp;rp=rpnext) { rpnext = (struct Ufunction*)dtnext(shp->fpathdict,rp); if(rp->fdict) nv_delete(rp->np,rp->fdict,NV_NOFREE); rp->fdict = 0; } } while(pp) { if((pp->flags&PATH_FPATH) && !(pp->flags&PATH_BFPATH)) { if(pp->flags&PATH_PATH) pp->flags &= ~PATH_FPATH; else { Pathcomp_t *ppsave=pp; if(old) old->next = pp->next; else first = pp->next; pp = pp->next; if(--ppsave->refcount<=0) { if(ppsave->lib) free((void*)ppsave->lib); free((void*)ppsave); } continue; } } old = pp; pp = pp->next; } return(first); } Pathcomp_t *path_dirfind(Pathcomp_t *first,const char *name,int c) { register Pathcomp_t *pp=first; while(pp) { if(memcmp(name,pp->name,pp->len)==0 && name[pp->len]==c) return(pp); pp = pp->next; } return(0); } /* * get discipline for tracked alias */ static char *talias_get(Namval_t *np, Namfun_t *nvp) { Pathcomp_t *pp = (Pathcomp_t*)np->nvalue.cp; char *ptr; if(!pp) return(NULL); path_nextcomp(pp,nv_name(np),pp); ptr = stakfreeze(0); return(ptr+PATH_OFFSET); } static void talias_put(register Namval_t* np,const char *val,int flags,Namfun_t *fp) { if(!val && np->nvalue.cp) { Pathcomp_t *pp = (Pathcomp_t*)np->nvalue.cp; if(--pp->refcount<=0) free((void*)pp); } nv_putv(np,val,flags,fp); } static const Namdisc_t talias_disc = { 0, talias_put, talias_get }; static Namfun_t talias_init = { &talias_disc, 1 }; /* * set tracked alias node to value */ void path_alias(register Namval_t *np,register Pathcomp_t *pp) { if(pp) { struct stat statb; char *sp; nv_offattr(np,NV_NOPRINT); nv_stack(np,&talias_init); np->nvalue.cp = (char*)pp; pp->refcount++; nv_setattr(np,NV_TAGGED|NV_NOFREE); path_nextcomp(pp,nv_name(np),pp); sp = stakptr(PATH_OFFSET); if(sp && lstat(sp,&statb)>=0 && S_ISLNK(statb.st_mode)) nv_setsize(np,statb.st_size+1); else nv_setsize(np,0); } else nv_unset(np); }