mirror of
https://github.com/sheumann/hush.git
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Patch from Jonas Holmberg, adjusted by Robert Schwebel, and
later re-adjusted by me to fix msh backtick handling
This commit is contained in:
Eric Andersen
parent
d2b8118650
commit
737f5fb890
199
shell/msh.c
199
shell/msh.c
@ -5,6 +5,11 @@
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* This version of the Minix shell was adapted for use in busybox
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* by Erik Andersen <andersee@debian.org>
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*
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* - backtick expansion did not work properly
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* Jonas Holmberg <jonas.holmberg@axis.com>
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* Robert Schwebel <r.schwebel@pengutronix.de>
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* Erik Andersen <andersee@debian.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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@ -222,7 +227,7 @@ static char *space (int n );
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static char *strsave (char *s, int a );
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static char *evalstr (char *cp, int f );
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static char *putn (int n );
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static char *itoa (unsigned u, int n );
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static char *itoa (int n );
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static char *unquote (char *as );
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static struct var *lookup (char *n );
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static int rlookup (char *n );
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@ -664,7 +669,6 @@ static int heedint =1;
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static struct env e ={line, iostack, iostack-1, (xint *)NULL, FDBASE, (struct env *)NULL};
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static void (*qflag)(int) = SIG_IGN;
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static char shellname[] = "/bin/sh";
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static char search[] = ":/bin:/usr/bin";
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static int startl;
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static int peeksym;
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static int nlseen;
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@ -687,7 +691,6 @@ static void * brkaddr;
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static char * current_prompt;
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#endif
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/* -------- sh.c -------- */
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/*
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* shell
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@ -722,11 +725,15 @@ extern int msh_main(int argc, char **argv)
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setval(homedir, "/");
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export(homedir);
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setval(lookup("$"), itoa(getpid(), 5));
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setval(lookup("$"), putn(getpid()));
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path = lookup("PATH");
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if (path->value == null)
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setval(path, search);
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if (path->value == null) {
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if (geteuid() == 0)
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setval(path, "/sbin:/bin:/usr/sbin:/usr/bin");
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else
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setval(path, "/bin:/usr/bin");
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}
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export(path);
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ifs = lookup("IFS");
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@ -858,7 +865,7 @@ setdash()
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cp = m;
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for (c='a'; c<='z'; c++)
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if (flag[c])
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if (flag[(int)c])
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*cp++ = c;
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*cp = 0;
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setval(lookup("-"), m);
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@ -1047,32 +1054,16 @@ static char *
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putn(n)
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register int n;
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{
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return(itoa(n, -1));
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return(itoa(n));
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}
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static char *
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itoa(u, n)
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register unsigned u;
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int n;
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itoa(n)
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register int n;
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{
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register char *cp;
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static char s[20];
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int m;
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m = 0;
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if (n < 0 && (int) u < 0) {
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m++;
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u = -u;
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}
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cp = s+sizeof(s);
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*--cp = 0;
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do {
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*--cp = u%10 + '0';
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u /= 10;
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} while (--n > 0 || u);
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if (m)
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*--cp = '-';
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return(cp);
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snprintf(s, sizeof(s), "%u", n);
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return(s);
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}
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static void
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@ -2326,6 +2317,9 @@ int act;
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switch(t->type) {
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case TPAREN:
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rv = execute(t->left, pin, pout, 0);
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break;
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case TCOM:
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{
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int child;
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@ -2877,12 +2871,12 @@ char *c, **v, **envp;
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*v = e.linep;
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tp = *--v;
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*v = e.linep;
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execve("/bin/sh", v, envp);
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execve(shellname, v, envp);
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*v = tp;
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return("no Shell");
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case ENOMEM:
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return("program too big");
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return((char*)memory_exhausted);
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case E2BIG:
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return("argument list too long");
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@ -3643,7 +3637,7 @@ loop:
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*/
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static int
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subgetc(ec, quoted)
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register int ec;
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register char ec;
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int quoted;
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{
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register char c;
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@ -3770,59 +3764,154 @@ int quoted;
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/*
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* Run the command in `...` and read its output.
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*/
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static int
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grave(quoted)
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int quoted;
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{
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register int i;
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char *cp;
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register int i;
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int j;
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int pf[2];
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static char child_cmd[LINELIM];
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char *src;
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char *dest;
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int count;
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int ignore;
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int ignore_once;
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char *argument_list[4];
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#if __GNUC__
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/* Avoid longjmp clobbering */
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(void) &cp;
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#endif
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for (cp = e.iop->argp->aword; *cp != '`'; cp++)
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if (*cp == 0) {
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err("no closing `");
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return(0);
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}
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/* string copy with dollar expansion */
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src = e.iop->argp->aword;
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dest = child_cmd;
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count = 0;
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ignore = 0;
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ignore_once = 0;
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while ((*src != '`') && (count < LINELIM)) {
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if (*src == '\'')
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ignore = !ignore;
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if (*src == '\\')
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ignore_once = 1;
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if (*src == '$' && !ignore && !ignore_once) {
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struct var *vp;
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char var_name[LINELIM];
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char alt_value[LINELIM];
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int var_index = 0;
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int alt_index = 0;
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char operator = 0;
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int braces = 0;
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char *value;
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src++;
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if (*src == '{') {
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braces = 1;
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src++;
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}
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var_name[var_index++] = *src++;
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while (isalnum(*src))
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var_name[var_index++] = *src++;
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var_name[var_index] = 0;
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if (braces) {
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switch (*src) {
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case '}':
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break;
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case '-':
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case '=':
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case '+':
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case '?':
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operator = *src;
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break;
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default:
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err("unclosed ${\n");
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return(0);
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}
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if (operator) {
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src++;
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while (*src && (*src != '}')) {
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alt_value[alt_index++] = *src++;
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}
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alt_value[alt_index] = 0;
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if (*src != '}') {
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err("unclosed ${\n");
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return(0);
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}
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}
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src++;
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}
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vp = lookup(var_name);
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if (vp->value != null)
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value = (operator == '+')? alt_value : vp->value;
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else if (operator == '?') {
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err(alt_value);
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return(0);
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} else if (alt_index && (operator != '+')) {
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value = alt_value;
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if (operator == '=')
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setval(vp, value);
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} else
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continue;
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while (*value && (count < LINELIM)) {
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*dest++ = *value++;
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count++;
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}
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} else {
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*dest++ = *src++;
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count++;
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ignore_once = 0;
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}
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}
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*dest = '\0';
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if (openpipe(pf) < 0)
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return(0);
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if ((i = vfork()) == -1) {
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while ((i = vfork()) == -1 && errno == EAGAIN)
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;
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if (i < 0) {
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closepipe(pf);
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err("try again");
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err((char*)memory_exhausted);
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return(0);
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}
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if (i != 0) {
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waitpid(i, NULL, 0);
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e.iop->argp->aword = ++cp;
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close(pf[1]);
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PUSHIO(afile, remap(pf[0]), (int(*)(struct ioarg *))((quoted)? qgravechar: gravechar));
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return(1);
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}
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*cp = 0;
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/* allow trapped signals */
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for (i=0; i<=_NSIG; i++)
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if (ourtrap[i] && signal(i, SIG_IGN) != SIG_IGN)
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signal(i, SIG_DFL);
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/* XXX - Maybe this signal stuff should go as well? */
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for (j=0; j<=_NSIG; j++)
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if (ourtrap[j] && signal(j, SIG_IGN) != SIG_IGN)
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signal(j, SIG_DFL);
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dup2(pf[1], 1);
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closepipe(pf);
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flag['e'] = 0;
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flag['v'] = 0;
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flag['n'] = 0;
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cp = strsave(e.iop->argp->aword, 0);
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areanum = 1;
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freehere(areanum);
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freearea(areanum); /* free old space */
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e.oenv = NULL;
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e.iop = (e.iobase = iostack) - 1;
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unquote(cp);
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interactive = 0;
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PUSHIO(aword, cp, nlchar);
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onecommand();
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exit(1);
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argument_list[0] = shellname;
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argument_list[1] = "-c";
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argument_list[2] = child_cmd;
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argument_list[3] = 0;
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prs(rexecve(argument_list[0], argument_list, makenv()));
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_exit(1);
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}
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static char *
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unquote(as)
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register char *as;
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@ -4194,7 +4283,7 @@ static int my_getc( int ec)
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return(c);
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}
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c = readc();
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if (ec != '\'' && e.iop->task != XGRAVE) {
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if ((ec != '\'') && (ec != '`') && (e.iop->task != XGRAVE)) {
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if(c == '\\') {
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c = readc();
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if (c == '\n' && ec != '\"')
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@ -4457,7 +4546,7 @@ register struct ioarg *ap;
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}
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#ifdef CONFIG_FEATURE_COMMAND_EDITING
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if (interactive) {
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if (interactive && isatty(ap->afile)) {
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static char mycommand[BUFSIZ];
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static int position = 0, size = 0;
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@ -4568,7 +4657,7 @@ static void
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prn(u)
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unsigned u;
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{
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prs(itoa(u, 0));
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prs(itoa(u));
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}
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static void
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