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hush: disallow "{echo hi; }" (require whitespace)
and "{ echo hi }" (require semicolon or &) function old new delta parse_stream 2098 2176 +78 done_command 98 84 -14 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 1/1 up/down: 78/-14) Total: 64 bytes
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5ff9629b8f
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55
shell/hush.c
55
shell/hush.c
@ -319,6 +319,10 @@ struct command {
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*/
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struct redir_struct *redirects; /* I/O redirections */
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};
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/* Is there anything in this command at all? */
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#define IS_NULL_CMD(cmd) \
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(!(cmd)->group && !(cmd)->argv && !(cmd)->redirects)
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struct pipe {
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struct pipe *next;
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@ -341,6 +345,9 @@ typedef enum pipe_style {
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PIPE_OR = 3,
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PIPE_BG = 4,
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} pipe_style;
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/* Is there anything in this pipe at all? */
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#define IS_NULL_PIPE(pi) \
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((pi)->num_cmds == 0 IF_HAS_KEYWORDS( && (pi)->res_word == RES_NONE))
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/* This holds pointers to the various results of parsing */
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struct parse_context {
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@ -3971,8 +3978,10 @@ static struct pipe *new_pipe(void)
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return pi;
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}
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/* Command (member of a pipe) is complete. The only possible error here
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* is out of memory, in which case xmalloc exits. */
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/* Command (member of a pipe) is complete, or we start a new pipe
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* if ctx->command is NULL.
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* No errors possible here.
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*/
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static int done_command(struct parse_context *ctx)
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{
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/* The command is really already in the pipe structure, so
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@ -3981,13 +3990,9 @@ static int done_command(struct parse_context *ctx)
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struct command *command = ctx->command;
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if (command) {
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if (command->group == NULL
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&& command->argv == NULL
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&& command->redirects == NULL
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) {
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if (IS_NULL_CMD(command)) {
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debug_printf_parse("done_command: skipping null cmd, num_cmds=%d\n", pi->num_cmds);
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memset(command, 0, sizeof(*command)); /* paranoia */
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return pi->num_cmds;
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goto clear_and_ret;
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}
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pi->num_cmds++;
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debug_printf_parse("done_command: ++num_cmds=%d\n", pi->num_cmds);
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@ -3999,12 +4004,9 @@ static int done_command(struct parse_context *ctx)
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/* Only real trickiness here is that the uncommitted
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* command structure is not counted in pi->num_cmds. */
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pi->cmds = xrealloc(pi->cmds, sizeof(*pi->cmds) * (pi->num_cmds+1));
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command = &pi->cmds[pi->num_cmds];
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ctx->command = command = &pi->cmds[pi->num_cmds];
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clear_and_ret:
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memset(command, 0, sizeof(*command));
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ctx->command = command;
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/* but ctx->pipe and ctx->list_head remain unchanged */
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return pi->num_cmds; /* used only for 0/nonzero check */
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}
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@ -4024,9 +4026,7 @@ static void done_pipe(struct parse_context *ctx, pipe_style type)
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/* Without this check, even just <enter> on command line generates
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* tree of three NOPs (!). Which is harmless but annoying.
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* IOW: it is safe to do it unconditionally.
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* RES_NONE case is for "for a in; do ..." (empty IN set)
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* and other cases to work. */
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* IOW: it is safe to do it unconditionally. */
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if (not_null
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#if ENABLE_HUSH_IF
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|| ctx->ctx_res_w == RES_FI
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@ -4048,7 +4048,7 @@ static void done_pipe(struct parse_context *ctx, pipe_style type)
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ctx->pipe->next = new_p;
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ctx->pipe = new_p;
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/* RES_THEN, RES_DO etc are "sticky" -
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* they remain set for commands inside if/while.
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* they remain set for pipes inside if/while.
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* This is used to control execution.
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* RES_FOR and RES_IN are NOT sticky (needed to support
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* cases where variable or value happens to match a keyword):
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@ -4304,7 +4304,7 @@ static int done_word(o_string *word, struct parse_context *ctx)
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&& ctx->ctx_res_w != RES_IN
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# endif
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) {
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debug_printf_parse(": checking '%s' for reserved-ness\n", word->data);
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debug_printf_parse("checking '%s' for reserved-ness\n", word->data);
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if (reserved_word(word, ctx)) {
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o_reset_to_empty_unquoted(word);
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debug_printf_parse("done_word return %d\n",
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@ -4775,6 +4775,14 @@ static int parse_group(o_string *dest, struct parse_context *ctx,
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if (ch == '(') {
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endch = ')';
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command->grp_type = GRP_SUBSHELL;
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} else {
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/* bash does not allow "{echo...", requires whitespace */
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ch = i_getch(input);
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if (ch != ' ' && ch != '\t' && ch != '\n') {
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syntax_error_unexpected_ch(ch);
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return 1;
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}
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nommu_addchr(&ctx->as_string, ch);
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}
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{
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@ -5352,13 +5360,11 @@ static struct pipe *parse_stream(char **pstring,
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if (end_trigger && end_trigger == ch
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&& (heredoc_cnt == 0 || end_trigger != ';')
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) {
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//TODO: disallow "{ cmd }" without semicolon
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if (heredoc_cnt) {
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/* This is technically valid:
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* { cat <<HERE; }; echo Ok
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* heredoc
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* heredoc
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* heredoc
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* HERE
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* but we don't support this.
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* We require heredoc to be in enclosing {}/(),
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@ -5370,6 +5376,15 @@ static struct pipe *parse_stream(char **pstring,
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if (done_word(&dest, &ctx)) {
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goto parse_error;
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}
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/* Disallow "{ cmd }" without semicolon or & */
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//debug_printf_parse("null pi %d\n", IS_NULL_PIPE(ctx.pipe))
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//debug_printf_parse("null cmd %d\n", IS_NULL_CMD(ctx.command))
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if (ch == '}'
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&& !(IS_NULL_PIPE(ctx.pipe) && IS_NULL_CMD(ctx.command))
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) {
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syntax_error_unexpected_ch(ch);
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goto parse_error;
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}
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done_pipe(&ctx, PIPE_SEQ);
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dest.o_assignment = MAYBE_ASSIGNMENT;
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/* Do we sit outside of any if's, loops or case's? */
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