/* $OpenBSD: exec.c,v 1.46 2006/04/10 14:38:59 jaredy Exp $ */ #include "sh.h" __RCSID("$MirOS: src/bin/mksh/exec.c,v 1.27 2007/04/15 12:09:57 tg Exp $"); static int comexec(struct op *, struct tbl *volatile, const char **, int volatile); static void scriptexec(struct op *, const char **) __attribute__((noreturn)); static int call_builtin(struct tbl *, const char **); static int iosetup(struct ioword *, struct tbl *); static int herein(const char *, int); static const char *do_selectargs(const char **, bool); static int dbteste_isa(Test_env *, Test_meta); static const char *dbteste_getopnd(Test_env *, Test_op, int); static int dbteste_eval(Test_env *, Test_op, const char *, const char *, int); static void dbteste_error(Test_env *, int, const char *); /* * execute command tree */ int execute(struct op *volatile t, volatile int flags) /* if XEXEC don't fork */ { int i; volatile int rv = 0; int pv[2]; const char ** volatile ap; char ** volatile up; const char *s, *cp; struct ioword **iowp; struct tbl *tp = NULL; if (t == NULL) return 0; /* Is this the end of a pipeline? If so, we want to evaluate the * command arguments bool eval_done = false; if ((flags&XFORK) && !(flags&XEXEC) && (flags&XPCLOSE)) { eval_done = true; tp = eval_execute_args(t, &ap); } */ if ((flags&XFORK) && !(flags&XEXEC) && t->type != TPIPE) return exchild(t, flags & ~XTIME, -1); /* run in sub-process */ newenv(E_EXEC); if (trap) runtraps(0); if (t->type == TCOM) { /* Clear subst_exstat before argument expansion. Used by * null commands (see comexec() and c_eval()) and by c_set(). */ subst_exstat = 0; current_lineno = t->lineno; /* for $LINENO */ /* POSIX says expand command words first, then redirections, * and assignments last.. */ up = eval(t->args, t->u.evalflags | DOBLANK | DOGLOB | DOTILDE); if (flags & XTIME) /* Allow option parsing (bizarre, but POSIX) */ timex_hook(t, &up); ap = (const char **)up; if (Flag(FXTRACE) && ap[0]) { shf_fprintf(shl_out, "%s", substitute(str_val(global("PS4")), 0)); for (i = 0; ap[i]; i++) shf_fprintf(shl_out, "%s%s", ap[i], ap[i + 1] ? space : newline); shf_flush(shl_out); } if (ap[0]) tp = findcom(ap[0], FC_BI|FC_FUNC); } flags &= ~XTIME; if (t->ioact != NULL || t->type == TPIPE || t->type == TCOPROC) { e->savefd = (short *) alloc(sizeofN(short, NUFILE), ATEMP); /* initialise to not redirected */ memset(e->savefd, 0, sizeofN(short, NUFILE)); } /* do redirection, to be restored in quitenv() */ if (t->ioact != NULL) for (iowp = t->ioact; *iowp != NULL; iowp++) { if (iosetup(*iowp, tp) < 0) { exstat = rv = 1; /* Redirection failures for special commands * cause (non-interactive) shell to exit. */ if (tp && tp->type == CSHELL && (tp->flag & SPEC_BI)) errorf(null); /* Deal with FERREXIT, quitenv(), etc. */ goto Break; } } switch (t->type) { case TCOM: rv = comexec(t, tp, (const char **)ap, flags); break; case TPAREN: rv = execute(t->left, flags|XFORK); break; case TPIPE: flags |= XFORK; flags &= ~XEXEC; e->savefd[0] = savefd(0); e->savefd[1] = savefd(1); while (t->type == TPIPE) { openpipe(pv); (void) ksh_dup2(pv[1], 1, false); /* stdout of curr */ /* Let exchild() close pv[0] in child * (if this isn't done, commands like * (: ; cat /etc/termcap) | sleep 1 * will hang forever). */ exchild(t->left, flags|XPIPEO|XCCLOSE, pv[0]); (void) ksh_dup2(pv[0], 0, false); /* stdin of next */ closepipe(pv); flags |= XPIPEI; t = t->right; } restfd(1, e->savefd[1]); /* stdout of last */ e->savefd[1] = 0; /* no need to re-restore this */ /* Let exchild() close 0 in parent, after fork, before wait */ i = exchild(t, flags|XPCLOSE, 0); if (!(flags&XBGND) && !(flags&XXCOM)) rv = i; break; case TLIST: while (t->type == TLIST) { execute(t->left, flags & XERROK); t = t->right; } rv = execute(t, flags & XERROK); break; case TCOPROC: { sigset_t omask; /* Block sigchild as we are using things changed in the * signal handler */ sigprocmask(SIG_BLOCK, &sm_sigchld, &omask); e->type = E_ERRH; i = sigsetjmp(e->jbuf, 0); if (i) { sigprocmask(SIG_SETMASK, &omask, NULL); quitenv(NULL); unwind(i); /* NOTREACHED */ } /* Already have a (live) co-process? */ if (coproc.job && coproc.write >= 0) errorf("coprocess already exists"); /* Can we re-use the existing co-process pipe? */ coproc_cleanup(true); /* do this before opening pipes, in case these fail */ e->savefd[0] = savefd(0); e->savefd[1] = savefd(1); openpipe(pv); if (pv[0] != 0) { ksh_dup2(pv[0], 0, false); close(pv[0]); } coproc.write = pv[1]; coproc.job = NULL; if (coproc.readw >= 0) ksh_dup2(coproc.readw, 1, false); else { openpipe(pv); coproc.read = pv[0]; ksh_dup2(pv[1], 1, false); coproc.readw = pv[1]; /* closed before first read */ coproc.njobs = 0; /* create new coprocess id */ ++coproc.id; } sigprocmask(SIG_SETMASK, &omask, NULL); e->type = E_EXEC; /* no more need for error handler */ /* exchild() closes coproc.* in child after fork, * will also increment coproc.njobs when the * job is actually created. */ flags &= ~XEXEC; exchild(t->left, flags|XBGND|XFORK|XCOPROC|XCCLOSE, coproc.readw); break; } case TASYNC: /* XXX non-optimal, I think - "(foo &)", forks for (), * forks again for async... parent should optimise * this to "foo &"... */ rv = execute(t->left, (flags&~XEXEC)|XBGND|XFORK); break; case TOR: case TAND: rv = execute(t->left, XERROK); if (t->right != NULL && (rv == 0) == (t->type == TAND)) rv = execute(t->right, flags & XERROK); else flags |= XERROK; break; case TBANG: rv = !execute(t->right, XERROK); break; case TDBRACKET: { Test_env te; te.flags = TEF_DBRACKET; te.pos.wp = t->args; te.isa = dbteste_isa; te.getopnd = dbteste_getopnd; te.eval = dbteste_eval; te.error = dbteste_error; rv = test_parse(&te); break; } case TFOR: case TSELECT: { volatile bool is_first = true; ap = (t->vars == NULL) ? e->loc->argv + 1 : (const char **)eval((const char **)t->vars, DOBLANK | DOGLOB | DOTILDE); e->type = E_LOOP; while (1) { i = sigsetjmp(e->jbuf, 0); if (!i) break; if ((e->flags&EF_BRKCONT_PASS) || (i != LBREAK && i != LCONTIN)) { quitenv(NULL); unwind(i); } else if (i == LBREAK) { rv = 0; goto Break; } } rv = 0; /* in case of a continue */ if (t->type == TFOR) { while (*ap != NULL) { setstr(global(t->str), *ap++, KSH_UNWIND_ERROR); rv = execute(t->left, flags & XERROK); } } else { /* TSELECT */ for (;;) { if (!(cp = do_selectargs(ap, is_first))) { rv = 1; break; } is_first = false; setstr(global(t->str), cp, KSH_UNWIND_ERROR); rv = execute(t->left, flags & XERROK); } } } break; case TWHILE: case TUNTIL: e->type = E_LOOP; while (1) { i = sigsetjmp(e->jbuf, 0); if (!i) break; if ((e->flags&EF_BRKCONT_PASS) || (i != LBREAK && i != LCONTIN)) { quitenv(NULL); unwind(i); } else if (i == LBREAK) { rv = 0; goto Break; } } rv = 0; /* in case of a continue */ while ((execute(t->left, XERROK) == 0) == (t->type == TWHILE)) rv = execute(t->right, flags & XERROK); break; case TIF: case TELIF: if (t->right == NULL) break; /* should be error */ rv = execute(t->left, XERROK) == 0 ? execute(t->right->left, flags & XERROK) : execute(t->right->right, flags & XERROK); break; case TCASE: cp = evalstr(t->str, DOTILDE); for (t = t->left; t != NULL && t->type == TPAT; t = t->right) for (ap = (const char **)t->vars; *ap; ap++) if ((s = evalstr(*ap, DOTILDE|DOPAT)) && gmatchx(cp, s, false)) goto Found; break; Found: rv = execute(t->left, flags & XERROK); break; case TBRACE: rv = execute(t->left, flags & XERROK); break; case TFUNCT: rv = define(t->str, t); break; case TTIME: /* Clear XEXEC so nested execute() call doesn't exit * (allows "ls -l | time grep foo"). */ rv = timex(t, flags & ~XEXEC); break; case TEXEC: /* an eval'd TCOM */ s = t->args[0]; up = makenv(); restoresigs(); cleanup_proc_env(); { union mksh_ccphack cargs; cargs.ro = t->args; execve(t->str, cargs.rw, up); } if (errno == ENOEXEC) scriptexec(t, (const char **)up); else errorf("%s: %s", s, strerror(errno)); } Break: exstat = rv; quitenv(NULL); /* restores IO */ if ((flags&XEXEC)) unwind(LEXIT); /* exit child */ if (rv != 0 && !(flags & XERROK)) { if (Flag(FERREXIT)) unwind(LERROR); trapsig(SIGERR_); } return rv; } /* * execute simple command */ static int comexec(struct op *t, struct tbl *volatile tp, const char **ap, volatile int flags) { int i; volatile int rv = 0; const char *cp; const char **lastp; static struct op texec; /* Must be static (XXX but why?) */ int type_flags; int keepasn_ok; int fcflags = FC_BI|FC_FUNC|FC_PATH; int bourne_function_call = 0; /* snag the last argument for $_ XXX not the same as at&t ksh, * which only seems to set $_ after a newline (but not in * functions/dot scripts, but in interactive and script) - * perhaps save last arg here and set it in shell()?. */ if (Flag(FTALKING) && *(lastp = ap)) { while (*++lastp) ; /* setstr() can't fail here */ setstr(typeset("_", LOCAL, 0, INTEGER, 0), *--lastp, KSH_RETURN_ERROR); } /* Deal with the shell builtins builtin, exec and command since * they can be followed by other commands. This must be done before * we know if we should create a local block which must be done * before we can do a path search (in case the assignments change * PATH). * Odd cases: * FOO=bar exec > /dev/null FOO is kept but not exported * FOO=bar exec foobar FOO is exported * FOO=bar command exec > /dev/null FOO is neither kept nor exported * FOO=bar command FOO is neither kept nor exported * PATH=... foobar use new PATH in foobar search */ keepasn_ok = 1; while (tp && tp->type == CSHELL) { fcflags = FC_BI|FC_FUNC|FC_PATH;/* undo effects of command */ if (tp->val.f == c_builtin) { if ((cp = *++ap) == NULL) { tp = NULL; break; } tp = findcom(cp, FC_BI); if (tp == NULL) errorf("builtin: %s: not a builtin", cp); continue; } else if (tp->val.f == c_exec) { if (ap[1] == NULL) break; ap++; flags |= XEXEC; } else if (tp->val.f == c_command) { int optc, saw_p = 0; /* Ugly dealing with options in two places (here and * in c_command(), but such is life) */ ksh_getopt_reset(&builtin_opt, 0); while ((optc = ksh_getopt(ap, &builtin_opt, ":p")) == 'p') saw_p = 1; if (optc != EOF) break; /* command -vV or something */ /* don't look for functions */ fcflags = FC_BI|FC_PATH; if (saw_p) { if (Flag(FRESTRICTED)) { warningf(true, "command -p: restricted"); rv = 1; goto Leave; } fcflags |= FC_DEFPATH; } ap += builtin_opt.optind; /* POSIX says special builtins lose their status * if accessed using command. */ keepasn_ok = 0; if (!ap[0]) { /* ensure command with no args exits with 0 */ subst_exstat = 0; break; } } else break; tp = findcom(ap[0], fcflags & (FC_BI|FC_FUNC)); } if (keepasn_ok && (!ap[0] || (tp && (tp->flag & KEEPASN)))) type_flags = 0; else { /* create new variable/function block */ newblock(); /* ksh functions don't keep assignments, POSIX functions do. */ if (keepasn_ok && tp && tp->type == CFUNC && !(tp->flag & FKSH)) { bourne_function_call = 1; type_flags = 0; } else type_flags = LOCAL|LOCAL_COPY|EXPORT; } if (Flag(FEXPORT)) type_flags |= EXPORT; for (i = 0; t->vars[i]; i++) { cp = evalstr(t->vars[i], DOASNTILDE); if (Flag(FXTRACE)) { if (i == 0) shf_fprintf(shl_out, "%s", substitute(str_val(global("PS4")), 0)); shf_fprintf(shl_out, "%s%s", cp, t->vars[i + 1] ? space : newline); if (!t->vars[i + 1]) shf_flush(shl_out); } typeset(cp, type_flags, 0, 0, 0); if (bourne_function_call && !(type_flags & EXPORT)) typeset(cp, LOCAL|LOCAL_COPY|EXPORT, 0, 0, 0); } if ((cp = *ap) == NULL) { rv = subst_exstat; goto Leave; } else if (!tp) { if (Flag(FRESTRICTED) && vstrchr(cp, '/')) { warningf(true, "%s: restricted", cp); rv = 1; goto Leave; } tp = findcom(cp, fcflags); } switch (tp->type) { case CSHELL: /* shell built-in */ rv = call_builtin(tp, (const char **)ap); break; case CFUNC: /* function call */ { volatile int old_xflag; volatile Tflag old_inuse; const char *volatile old_kshname; if (!(tp->flag & ISSET)) { struct tbl *ftp; if (!tp->u.fpath) { if (tp->u2.errno_) { warningf(true, "%s: can't find function " "definition file - %s", cp, strerror(tp->u2.errno_)); rv = 126; } else { warningf(true, "%s: can't find function " "definition file", cp); rv = 127; } break; } if (include(tp->u.fpath, 0, NULL, 0) < 0) { warningf(true, "%s: can't open function definition file %s - %s", cp, tp->u.fpath, strerror(errno)); rv = 127; break; } if (!(ftp = findfunc(cp, hash(cp), false)) || !(ftp->flag & ISSET)) { warningf(true, "%s: function not defined by %s", cp, tp->u.fpath); rv = 127; break; } tp = ftp; } /* ksh functions set $0 to function name, POSIX functions leave * $0 unchanged. */ old_kshname = kshname; if (tp->flag & FKSH) kshname = ap[0]; else ap[0] = kshname; e->loc->argv = ap; for (i = 0; *ap++ != NULL; i++) ; e->loc->argc = i - 1; /* ksh-style functions handle getopts sanely, * bourne/posix functions are insane... */ if (tp->flag & FKSH) { e->loc->flags |= BF_DOGETOPTS; e->loc->getopts_state = user_opt; getopts_reset(1); } old_xflag = Flag(FXTRACE); Flag(FXTRACE) = tp->flag & TRACE ? true : false; old_inuse = tp->flag & FINUSE; tp->flag |= FINUSE; e->type = E_FUNC; i = sigsetjmp(e->jbuf, 0); if (i == 0) { /* seems odd to pass XERROK here, but at&t ksh does */ exstat = execute(tp->val.t, flags & XERROK); i = LRETURN; } kshname = old_kshname; Flag(FXTRACE) = old_xflag; tp->flag = (tp->flag & ~FINUSE) | old_inuse; /* Were we deleted while executing? If so, free the execution * tree. todo: Unfortunately, the table entry is never re-used * until the lookup table is expanded. */ if ((tp->flag & (FDELETE|FINUSE)) == FDELETE) { if (tp->flag & ALLOC) { tp->flag &= ~ALLOC; tfree(tp->val.t, tp->areap); } tp->flag = 0; } switch (i) { case LRETURN: case LERROR: rv = exstat; break; case LINTR: case LEXIT: case LLEAVE: case LSHELL: quitenv(NULL); unwind(i); /* NOTREACHED */ default: quitenv(NULL); internal_errorf(1, "CFUNC %d", i); } break; } case CEXEC: /* executable command */ case CTALIAS: /* tracked alias */ if (!(tp->flag&ISSET)) { /* errno_ will be set if the named command was found * but could not be executed (permissions, no execute * bit, directory, etc). Print out a (hopefully) * useful error message and set the exit status to 126. */ if (tp->u2.errno_) { warningf(true, "%s: cannot execute - %s", cp, strerror(tp->u2.errno_)); rv = 126; /* POSIX */ } else { warningf(true, "%s: not found", cp); rv = 127; } break; } /* set $_ to programme's full path */ /* setstr() can't fail here */ setstr(typeset("_", LOCAL|EXPORT, 0, INTEGER, 0), tp->val.s, KSH_RETURN_ERROR); if (flags&XEXEC) { j_exit(); if (!(flags&XBGND) || Flag(FMONITOR)) { setexecsig(&sigtraps[SIGINT], SS_RESTORE_ORIG); setexecsig(&sigtraps[SIGQUIT], SS_RESTORE_ORIG); } } /* to fork we set up a TEXEC node and call execute */ texec.type = TEXEC; texec.left = t; /* for tprint */ texec.str = tp->val.s; texec.args = ap; rv = exchild(&texec, flags, -1); break; } Leave: if (flags & XEXEC) { exstat = rv; unwind(LLEAVE); } return rv; } static void scriptexec(struct op *tp, const char **ap) { const char *sh; unsigned char *cp; char buf[64]; /* 64 == MAXINTERP in MirBSD */ int fd; union mksh_ccphack args, cap; sh = str_val(global("EXECSHELL")); if (sh && *sh) sh = search(sh, path, X_OK, NULL); if (!sh || !*sh) sh = "/bin/sh"; *tp->args-- = tp->str; if ((fd = open(tp->str, O_RDONLY)) >= 0) { /* read first MAXINTERP octets from file */ if (read(fd, buf, sizeof (buf)) <= 0) /* read error -> no good */ buf[0] = '\0'; close(fd); /* scan for newline or NUL _before_ end of buffer */ cp = (unsigned char *)buf; while ((char *)cp < (buf + sizeof (buf))) if (*cp == '\0' || *cp == '\n') { *cp = '\0'; break; } else ++cp; /* if the shebang line is longer than MAXINTERP, bail out */ if ((char *)cp >= (buf + sizeof (buf))) goto noshebang; /* skip UTF-8 Byte Order Mark, if present */ cp = (unsigned char *)buf; if ((cp[0] == 0xEF) && (cp[1] == 0xBB) && (cp[2] == 0xBF)) cp += 3; /* bail out if read error (above) or no shebang */ if ((cp[0] != '#') || (cp[1] != '!')) goto noshebang; cp += 2; /* skip whitespace before shell name */ while (*cp == ' ' || *cp == '\t') ++cp; /* just whitespace on the line? */ if (*cp == '\0') goto noshebang; /* no, we actually found an interpreter name */ sh = (char *)cp; /* look for end of shell/interpreter name */ while (*cp != ' ' && *cp != '\t' && *cp != '\0') ++cp; /* any arguments? */ if (*cp) { *cp++ = '\0'; /* skip spaces before arguments */ while (*cp == ' ' || *cp == '\t') ++cp; /* pass it all in ONE argument (historic reasons) */ if (*cp) *tp->args-- = (char *)cp; } } noshebang: args.ro = tp->args; *args.ro = sh; cap.ro = ap; execve(args.rw[0], args.rw, cap.rw); /* report both the program that was run and the bogus shell */ errorf("%s: %s: %s", tp->str, sh, strerror(errno)); } int shcomexec(const char **wp) { struct tbl *tp; tp = ktsearch(&builtins, *wp, hash(*wp)); if (tp == NULL) internal_errorf(1, "shcomexec: %s", *wp); return (call_builtin(tp, wp)); } /* * Search function tables for a function. If create set, a table entry * is created if none is found. */ struct tbl * findfunc(const char *name, unsigned int h, int create) { struct block *l; struct tbl *tp = NULL; for (l = e->loc; l; l = l->next) { tp = ktsearch(&l->funs, name, h); if (tp) break; if (!l->next && create) { tp = ktenter(&l->funs, name, h); tp->flag = DEFINED; tp->type = CFUNC; tp->val.t = NULL; break; } } return tp; } /* * define function. Returns 1 if function is being undefined (t == 0) and * function did not exist, returns 0 otherwise. */ int define(const char *name, struct op *t) { struct tbl *tp; int was_set = 0; while (1) { tp = findfunc(name, hash(name), true); if (tp->flag & ISSET) was_set = 1; /* If this function is currently being executed, we zap this * table entry so findfunc() won't see it */ if (tp->flag & FINUSE) { tp->name[0] = '\0'; tp->flag &= ~DEFINED; /* ensure it won't be found */ tp->flag |= FDELETE; } else break; } if (tp->flag & ALLOC) { tp->flag &= ~(ISSET|ALLOC); tfree(tp->val.t, tp->areap); } if (t == NULL) { /* undefine */ ktdelete(tp); return was_set ? 0 : 1; } tp->val.t = tcopy(t->left, tp->areap); tp->flag |= (ISSET|ALLOC); if (t->u.ksh_func) tp->flag |= FKSH; return 0; } /* * add builtin */ void builtin(const char *name, int (*func) (const char **)) { struct tbl *tp; Tflag flag; /* see if any flags should be set for this builtin */ for (flag = 0; ; name++) { if (*name == '=') /* command does variable assignment */ flag |= KEEPASN; else if (*name == '*') /* POSIX special builtin */ flag |= SPEC_BI; else if (*name == '+') /* POSIX regular builtin */ flag |= REG_BI; else break; } tp = ktenter(&builtins, name, hash(name)); tp->flag = DEFINED | flag; tp->type = CSHELL; tp->val.f = func; } /* * find command * either function, hashed command, or built-in (in that order) */ struct tbl * findcom(const char *name, int flags) { static struct tbl temp; unsigned int h = hash(name); struct tbl *tp = NULL, *tbi; int insert = Flag(FTRACKALL); /* insert if not found */ char *fpath; /* for function autoloading */ const char *npath; if (vstrchr(name, '/')) { insert = 0; /* prevent FPATH search below */ flags &= ~FC_FUNC; goto Search; } tbi = (flags & FC_BI) ? ktsearch(&builtins, name, h) : NULL; /* POSIX says special builtins first, then functions, then * POSIX regular builtins, then search path... */ if ((flags & FC_SPECBI) && tbi && (tbi->flag & SPEC_BI)) tp = tbi; if (!tp && (flags & FC_FUNC)) { tp = findfunc(name, h, false); if (tp && !(tp->flag & ISSET)) { if ((fpath = str_val(global("FPATH"))) == null) { tp->u.fpath = NULL; tp->u2.errno_ = 0; } else tp->u.fpath = search(name, fpath, R_OK, &tp->u2.errno_); } } if (!tp && (flags & FC_REGBI) && tbi && (tbi->flag & REG_BI)) tp = tbi; if (!tp && (flags & FC_UNREGBI) && tbi) tp = tbi; if (!tp && (flags & FC_PATH) && !(flags & FC_DEFPATH)) { tp = ktsearch(&taliases, name, h); if (tp && (tp->flag & ISSET) && access(tp->val.s, X_OK) != 0) { if (tp->flag & ALLOC) { tp->flag &= ~ALLOC; afree(tp->val.s, APERM); } tp->flag &= ~ISSET; } } Search: if ((!tp || (tp->type == CTALIAS && !(tp->flag&ISSET))) && (flags & FC_PATH)) { if (!tp) { if (insert && !(flags & FC_DEFPATH)) { tp = ktenter(&taliases, name, h); tp->type = CTALIAS; } else { tp = &temp; tp->type = CEXEC; } tp->flag = DEFINED; /* make ~ISSET */ } npath = search(name, flags & FC_DEFPATH ? def_path : path, X_OK, &tp->u2.errno_); if (npath) { tp->val.s = str_save(npath, APERM); tp->flag |= ISSET|ALLOC; } else if ((flags & FC_FUNC) && (fpath = str_val(global("FPATH"))) != null && (npath = search(name, fpath, R_OK, &tp->u2.errno_)) != NULL) { /* An undocumented feature of at&t ksh is that it * searches FPATH if a command is not found, even * if the command hasn't been set up as an autoloaded * function (ie, no typeset -uf). */ tp = &temp; tp->type = CFUNC; tp->flag = DEFINED; /* make ~ISSET */ tp->u.fpath = npath; } } return tp; } /* * flush executable commands with relative paths */ void flushcom(int all) /* just relative or all */ { struct tbl *tp; struct tstate ts; for (ktwalk(&ts, &taliases); (tp = ktnext(&ts)) != NULL; ) if ((tp->flag&ISSET) && (all || tp->val.s[0] != '/')) { if (tp->flag&ALLOC) { tp->flag &= ~(ALLOC|ISSET); afree(tp->val.s, APERM); } tp->flag &= ~ISSET; } } /* Check if path is something we want to find. Returns -1 for failure. */ int search_access(const char *lpath, int mode, int *errnop) /* set if candidate found, but not suitable */ { int ret, err = 0; struct stat statb; if (stat(lpath, &statb) < 0) return -1; ret = access(lpath, mode); if (ret < 0) err = errno; /* File exists, but we can't access it */ else if (mode == X_OK && (!S_ISREG(statb.st_mode) || !(statb.st_mode & (S_IXUSR|S_IXGRP|S_IXOTH)))) { /* This 'cause access() says root can execute everything */ ret = -1; err = S_ISDIR(statb.st_mode) ? EISDIR : EACCES; } if (err && errnop && !*errnop) *errnop = err; return ret; } /* * search for command with PATH */ const char * search(const char *name, const char *lpath, int mode, /* R_OK or X_OK */ int *errnop) /* set if candidate found, but not suitable */ { const char *sp, *p; char *xp; XString xs; int namelen; if (errnop) *errnop = 0; if (vstrchr(name, '/')) { if (search_access(name, mode, errnop) == 0) return (name); return NULL; } namelen = strlen(name) + 1; Xinit(xs, xp, 128, ATEMP); sp = lpath; while (sp != NULL) { xp = Xstring(xs, xp); if (!(p = cstrchr(sp, ':'))) p = sp + strlen(sp); if (p != sp) { XcheckN(xs, xp, p - sp); memcpy(xp, sp, p - sp); xp += p - sp; *xp++ = '/'; } sp = p; XcheckN(xs, xp, namelen); memcpy(xp, name, namelen); if (search_access(Xstring(xs, xp), mode, errnop) == 0) return Xclose(xs, xp + namelen); if (*sp++ == '\0') sp = NULL; } Xfree(xs, xp); return NULL; } static int call_builtin(struct tbl *tp, const char **wp) { int rv; builtin_argv0 = wp[0]; builtin_flag = tp->flag; shf_reopen(1, SHF_WR, shl_stdout); shl_stdout_ok = 1; ksh_getopt_reset(&builtin_opt, GF_ERROR); rv = (*tp->val.f)(wp); shf_flush(shl_stdout); shl_stdout_ok = 0; builtin_flag = 0; builtin_argv0 = NULL; return rv; } /* * set up redirection, saving old fds in e->savefd */ static int iosetup(struct ioword *iop, struct tbl *tp) { int u = -1; char *cp = iop->name; int iotype = iop->flag & IOTYPE; int do_open = 1, do_close = 0, flags = 0; struct ioword iotmp; struct stat statb; if (iotype != IOHERE) cp = evalonestr(cp, DOTILDE|(Flag(FTALKING_I) ? DOGLOB : 0)); /* Used for tracing and error messages to print expanded cp */ iotmp = *iop; iotmp.name = (iotype == IOHERE) ? NULL : cp; iotmp.flag |= IONAMEXP; if (Flag(FXTRACE)) shellf("%s%s\n", substitute(str_val(global("PS4")), 0), snptreef(NULL, 32, "%R", &iotmp)); switch (iotype) { case IOREAD: flags = O_RDONLY; break; case IOCAT: flags = O_WRONLY | O_APPEND | O_CREAT; break; case IOWRITE: flags = O_WRONLY | O_CREAT | O_TRUNC; /* The stat() is here to allow redirections to * things like /dev/null without error. */ if (Flag(FNOCLOBBER) && !(iop->flag & IOCLOB) && (stat(cp, &statb) < 0 || S_ISREG(statb.st_mode))) flags |= O_EXCL; break; case IORDWR: flags = O_RDWR | O_CREAT; break; case IOHERE: do_open = 0; /* herein() returns -2 if error has been printed */ u = herein(iop->heredoc, iop->flag & IOEVAL); /* cp may have wrong name */ break; case IODUP: { const char *emsg; do_open = 0; if (*cp == '-' && !cp[1]) { u = 1009; /* prevent error return below */ do_close = 1; } else if ((u = check_fd(cp, X_OK | ((iop->flag & IORDUP) ? R_OK : W_OK), &emsg)) < 0) { warningf(true, "%s: %s", snptreef(NULL, 32, "%R", &iotmp), emsg); return -1; } if (u == iop->unit) return 0; /* "dup from" == "dup to" */ break; } } if (do_open) { if (Flag(FRESTRICTED) && (flags & O_CREAT)) { warningf(true, "%s: restricted", cp); return -1; } u = open(cp, flags, 0666); } if (u < 0) { /* herein() may already have printed message */ if (u == -1) warningf(true, "cannot %s %s: %s", iotype == IODUP ? "dup" : (iotype == IOREAD || iotype == IOHERE) ? "open" : "create", cp, strerror(errno)); return -1; } /* Do not save if it has already been redirected (i.e. "cat >x >y"). */ if (e->savefd[iop->unit] == 0) { /* If these are the same, it means unit was previously closed */ if (u == iop->unit) e->savefd[iop->unit] = -1; else /* c_exec() assumes e->savefd[fd] set for any * redirections. Ask savefd() not to close iop->unit; * this allows error messages to be seen if iop->unit * is 2; also means we can't lose the fd (eg, both * dup2 below and dup2 in restfd() failing). */ e->savefd[iop->unit] = savefd(iop->unit); } if (do_close) close(iop->unit); else if (u != iop->unit) { if (ksh_dup2(u, iop->unit, true) < 0) { warningf(true, "could not finish (dup) redirection %s: %s", snptreef(NULL, 32, "%R", &iotmp), strerror(errno)); if (iotype != IODUP) close(u); return -1; } if (iotype != IODUP) close(u); /* Touching any co-process fd in an empty exec * causes the shell to close its copies */ else if (tp && tp->type == CSHELL && tp->val.f == c_exec) { if (iop->flag & IORDUP) /* possible exec <&p */ coproc_read_close(u); else /* possible exec >&p */ coproc_write_close(u); } } if (u == 2) /* Clear any write errors */ shf_reopen(2, SHF_WR, shl_out); return 0; } /* * open here document temp file. * if unquoted here, expand here temp file into second temp file. */ static int herein(const char *content, int sub) { volatile int fd = -1; struct source *s, *volatile osource; struct shf *volatile shf; struct temp *h; int i; /* ksh -c 'cat << EOF' can cause this... */ if (content == NULL) { warningf(true, "here document missing"); return -2; /* special to iosetup(): don't print error */ } /* Create temp file to hold content (done before newenv so temp * doesn't get removed too soon). */ h = maketemp(ATEMP, TT_HEREDOC_EXP, &e->temps); if (!(shf = h->shf) || (fd = open(h->name, O_RDONLY, 0)) < 0) { warningf(true, "can't %s temporary file %s: %s", !shf ? "create" : "open", h->name, strerror(errno)); if (shf) shf_close(shf); return -2 /* special to iosetup(): don't print error */; } osource = source; newenv(E_ERRH); i = sigsetjmp(e->jbuf, 0); if (i) { source = osource; quitenv(shf); close(fd); return -2; /* special to iosetup(): don't print error */ } if (sub) { /* Do substitutions on the content of heredoc */ s = pushs(SSTRING, ATEMP); s->start = s->str = content; source = s; if (yylex(ONEWORD|HEREDOC) != LWORD) internal_errorf(1, "herein: yylex"); source = osource; shf_puts(evalstr(yylval.cp, 0), shf); } else shf_puts(content, shf); quitenv(NULL); if (shf_close(shf) == EOF) { close(fd); warningf(true, "error writing %s: %s", h->name, strerror(errno)); return -2; /* special to iosetup(): don't print error */ } return fd; } /* * ksh special - the select command processing section * print the args in column form - assuming that we can */ static const char * do_selectargs(const char **ap, bool print_menu) { static const char *read_args[] = { "read", "-r", "REPLY", NULL }; char *s; int i, argct; for (argct = 0; ap[argct]; argct++) ; while (1) { /* Menu is printed if * - this is the first time around the select loop * - the user enters a blank line * - the REPLY parameter is empty */ if (print_menu || !*str_val(global("REPLY"))) pr_menu(ap); shellf("%s", str_val(global("PS3"))); if (call_builtin(findcom("read", FC_BI), read_args)) return NULL; s = str_val(global("REPLY")); if (*s) { getn(s, &i); return (i >= 1 && i <= argct) ? ap[i - 1] : null; } print_menu = 1; } } struct select_menu_info { const char *const *args; int arg_width; int num_width; }; static char *select_fmt_entry(const void *, int, char *, int); /* format a single select menu item */ static char * select_fmt_entry(const void *arg, int i, char *buf, int buflen) { const struct select_menu_info *smi = (const struct select_menu_info *)arg; shf_snprintf(buf, buflen, "%*d) %s", smi->num_width, i + 1, smi->args[i]); return buf; } /* * print a select style menu */ int pr_menu(const char *const *ap) { struct select_menu_info smi; const char *const *pp; int nwidth, dwidth; int i, n; /* Width/column calculations were done once and saved, but this * means select can't be used recursively so we re-calculate each * time (could save in a structure that is returned, but its probably * not worth the bother). */ /* * get dimensions of the list */ for (n = 0, nwidth = 0, pp = ap; *pp; n++, pp++) { i = strlen(*pp); nwidth = (i > nwidth) ? i : nwidth; } /* * we will print an index of the form * %d) * in front of each entry * get the max width of this */ for (i = n, dwidth = 1; i >= 10; i /= 10) dwidth++; smi.args = ap; smi.arg_width = nwidth; smi.num_width = dwidth; print_columns(shl_out, n, select_fmt_entry, (void *) &smi, dwidth + nwidth + 2, 1); return n; } /* XXX: horrible kludge to fit within the framework */ static char *plain_fmt_entry(const void *, int, char *, int); static char * plain_fmt_entry(const void *arg, int i, char *buf, int buflen) { shf_snprintf(buf, buflen, "%s", ((char *const *)arg)[i]); return buf; } int pr_list(char *const *ap) { char *const *pp; int nwidth; int i, n; for (n = 0, nwidth = 0, pp = ap; *pp; n++, pp++) { i = strlen(*pp); nwidth = (i > nwidth) ? i : nwidth; } print_columns(shl_out, n, plain_fmt_entry, (const void *)ap, nwidth + 1, 0); return n; } /* * [[ ... ]] evaluation routines */ extern const char *const dbtest_tokens[]; extern const char db_close[]; /* Test if the current token is a whatever. Accepts the current token if * it is. Returns 0 if it is not, non-zero if it is (in the case of * TM_UNOP and TM_BINOP, the returned value is a Test_op). */ static int dbteste_isa(Test_env *te, Test_meta meta) { int ret = 0; int uqword; const char *p; if (!*te->pos.wp) return meta == TM_END; /* unquoted word? */ for (p = *te->pos.wp; *p == CHAR; p += 2) ; uqword = *p == EOS; if (meta == TM_UNOP || meta == TM_BINOP) { if (uqword) { char buf[8]; /* longer than the longest operator */ char *q = buf; for (p = *te->pos.wp; *p == CHAR && q < &buf[sizeof(buf) - 1]; p += 2) *q++ = p[1]; *q = '\0'; ret = test_isop(meta, buf); } } else if (meta == TM_END) ret = 0; else ret = uqword && strcmp(*te->pos.wp, dbtest_tokens[(int) meta]) == 0; /* Accept the token? */ if (ret) te->pos.wp++; return ret; } static const char * dbteste_getopnd(Test_env *te, Test_op op, int do_eval) { const char *s = *te->pos.wp; if (!s) return NULL; te->pos.wp++; if (!do_eval) return null; if (op == TO_STEQL || op == TO_STNEQ) s = evalstr(s, DOTILDE | DOPAT); else s = evalstr(s, DOTILDE); return s; } static int dbteste_eval(Test_env *te, Test_op op, const char *opnd1, const char *opnd2, int do_eval) { return test_eval(te, op, opnd1, opnd2, do_eval); } static void dbteste_error(Test_env *te, int offset, const char *msg) { te->flags |= TEF_ERROR; internal_errorf(0, "dbteste_error: %s (offset %d)", msg, offset); }