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Commit1553be4

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committed
Prevent evaluation of backticks while discarding unwanted arguments
after an unknown or failed psql backslash command, and also whilediscarding "extra" arguments of a putatively valid backslash command.In the case of an unknown/failed command, make sure we discard thewhole rest of the line, rather than trying to resume at the nextbackslash. Per discussion with Thomer Gil.
1 parentcd5c7e7 commit1553be4

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3 files changed

+46
-21
lines changed

3 files changed

+46
-21
lines changed

‎src/bin/psql/command.c‎

Lines changed: 16 additions & 6 deletions
Original file line numberDiff line numberDiff line change
@@ -3,7 +3,7 @@
33
*
44
* Copyright (c) 2000-2004, PostgreSQL Global Development Group
55
*
6-
* $PostgreSQL: pgsql/src/bin/psql/command.c,v 1.137 2004/11/30 20:00:34 momjian Exp $
6+
* $PostgreSQL: pgsql/src/bin/psql/command.c,v 1.138 2004/12/19 19:39:47 tgl Exp $
77
*/
88
#include"postgres_fe.h"
99
#include"command.h"
@@ -127,13 +127,23 @@ HandleSlashCmds(PsqlScanState scan_state,
127127
status=CMD_ERROR;
128128
}
129129

130-
/* eat the rest of the options, if any */
131-
while ((arg=psql_scan_slash_option(scan_state,
132-
OT_NORMAL,NULL, false)))
130+
if (status!=CMD_ERROR)
133131
{
134-
if (status!=CMD_ERROR)
132+
/* eat any remaining arguments after a valid command */
133+
/* note we suppress evaluation of backticks here */
134+
while ((arg=psql_scan_slash_option(scan_state,
135+
OT_VERBATIM,NULL, false)))
136+
{
135137
psql_error("\\%s: extra argument \"%s\" ignored\n",cmd,arg);
136-
free(arg);
138+
free(arg);
139+
}
140+
}
141+
else
142+
{
143+
/* silently throw away rest of line after an erroneous command */
144+
while ((arg=psql_scan_slash_option(scan_state,
145+
OT_WHOLE_LINE,NULL, false)))
146+
free(arg);
137147
}
138148

139149
/* if there is a trailing \\, swallow it */

‎src/bin/psql/psqlscan.h‎

Lines changed: 3 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -3,7 +3,7 @@
33
*
44
* Copyright (c) 2000-2004, PostgreSQL Global Development Group
55
*
6-
* $PostgreSQL: pgsql/src/bin/psql/psqlscan.h,v 1.3 2004/08/29 05:06:54 momjian Exp $
6+
* $PostgreSQL: pgsql/src/bin/psql/psqlscan.h,v 1.4 2004/12/19 19:39:47 tgl Exp $
77
*/
88
#ifndefPSQLSCAN_H
99
#definePSQLSCAN_H
@@ -32,7 +32,8 @@ enum slash_option_type
3232
OT_SQLID,/* treat as SQL identifier */
3333
OT_SQLIDHACK,/* SQL identifier, but don't downcase */
3434
OT_FILEPIPE,/* it's a filename or pipe */
35-
OT_WHOLE_LINE/* just snarf the rest of the line */
35+
OT_WHOLE_LINE,/* just snarf the rest of the line */
36+
OT_VERBATIM/* literal (no backticks or variables) */
3637
};
3738

3839

‎src/bin/psql/psqlscan.l‎

Lines changed: 27 additions & 13 deletions
Original file line numberDiff line numberDiff line change
@@ -31,7 +31,7 @@
3131
* Portions Copyright (c) 1994, Regents of the University of California
3232
*
3333
* IDENTIFICATION
34-
* $PostgreSQL: pgsql/src/bin/psql/psqlscan.l,v 1.7 2004/08/29 04:13:02 momjian Exp $
34+
* $PostgreSQL: pgsql/src/bin/psql/psqlscan.l,v 1.8 2004/12/19 19:39:47 tgl Exp $
3535
*
3636
*-------------------------------------------------------------------------
3737
*/
@@ -723,24 +723,38 @@ other.
723723
}
724724

725725
"`"{
726-
*option_quote ='`';
727-
BEGIN(xslashbackquote);
726+
if (option_type == OT_VERBATIM)
727+
{
728+
/* in verbatim mode, backquote is not special */
729+
ECHO;
730+
BEGIN(xslashdefaultarg);
731+
}
732+
else
733+
{
734+
*option_quote ='`';
735+
BEGIN(xslashbackquote);
736+
}
728737
}
729738

730739
:[A-Za-z0-9_]*{
731740
/* Possible psql variable substitution */
732-
constchar *value;
741+
if (option_type == OT_VERBATIM)
742+
ECHO;
743+
else
744+
{
745+
constchar *value;
733746

734-
value =GetVariable(pset.vars, yytext +1);
747+
value =GetVariable(pset.vars, yytext +1);
735748

736-
/*
737-
* The variable value is just emitted without any
738-
* further examination. This is consistent with the
739-
* pre-8.0 code behavior, if not with the way that
740-
* variables are handled outside backslash commands.
741-
*/
742-
if (value)
743-
appendPQExpBufferStr(output_buf, value);
749+
/*
750+
* The variable value is just emitted without any
751+
* further examination. This is consistent with the
752+
* pre-8.0 code behavior, if not with the way that
753+
* variables are handled outside backslash commands.
754+
*/
755+
if (value)
756+
appendPQExpBufferStr(output_buf, value);
757+
}
744758

745759
*option_quote =':';
746760

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