pg_clean_ascii(): escape bytes rather than lose them

Rather than replace each unprintable byte with a '?' character, replace
it with a hex escape instead. The API now allocates a copy rather than
modifying the input in place.

Author: Jacob Champion <jchampion@timescale.com>
Discussion: https://www.postgresql.org/message-id/CAAWbhmgsvHrH9wLU2kYc3pOi1KSenHSLAHBbCVmmddW6-mc_=w@mail.gmail.com

src/backend/postmaster/postmaster.c

@@ -2280,11 +2280,7 @@ retry1:
 				 */
 				if (strcmp(nameptr, "application_name") == 0)
 				{
-					char	   *tmp_app_name = pstrdup(valptr);
-
-					pg_clean_ascii(tmp_app_name);
-
-					port->application_name = tmp_app_name;
+					port->application_name = pg_clean_ascii(valptr, 0);
 				}
 			}
 			offset = valoffset + strlen(valptr) + 1;

src/backend/utils/misc/guc.c

@@ -12921,9 +12921,18 @@ assign_maintenance_io_concurrency(int newval, void *extra)
 static bool
 check_application_name(char **newval, void **extra, GucSource source)
 {
+	char	   *clean;
+
 	/* Only allow clean ASCII chars in the application name */
-	pg_clean_ascii(*newval);
+	clean = pg_clean_ascii(*newval, MCXT_ALLOC_NO_OOM);
+	if (!clean)
+		return false;
+
+	clean = guc_strdup(WARNING, clean);
+	if (!clean)
+		return false;
 
+	*newval = clean;
 	return true;
 }
 
@@ -12937,9 +12946,18 @@ assign_application_name(const char *newval, void *extra)
 static bool
 check_cluster_name(char **newval, void **extra, GucSource source)
 {
+	char	   *clean;
+
 	/* Only allow clean ASCII chars in the cluster name */
-	pg_clean_ascii(*newval);
+	clean = pg_clean_ascii(*newval, MCXT_ALLOC_NO_OOM);
+	if (!clean)
+		return false;
+
+	clean = guc_strdup(WARNING, clean);
+	if (!clean)
+		return false;
 
+	*newval = clean;
 	return true;
 }
 

src/common/string.c

@@ -22,6 +22,7 @@
 #endif
 
 #include "common/string.h"
+#include "lib/stringinfo.h"
 
 
 /*
@@ -59,9 +60,12 @@ strtoint(const char *pg_restrict str, char **pg_restrict endptr, int base)
 
 
 /*
- * pg_clean_ascii -- Replace any non-ASCII chars with a '?' char
+ * pg_clean_ascii -- Replace any non-ASCII chars with a "\xXX" string
  *
- * Modifies the string passed in which must be '\0'-terminated.
+ * Makes a newly allocated copy of the string passed in, which must be
+ * '\0'-terminated. In the backend, additional alloc_flags may be provided and
+ * will be passed as-is to palloc_extended(); in the frontend, alloc_flags is
+ * ignored and the copy is malloc'd.
  *
  * This function exists specifically to deal with filtering out
  * non-ASCII characters in a few places where the client can provide an almost
@@ -73,22 +77,52 @@ strtoint(const char *pg_restrict str, char **pg_restrict endptr, int base)
  * In general, this function should NOT be used- instead, consider how to handle
  * the string without needing to filter out the non-ASCII characters.
  *
- * Ultimately, we'd like to improve the situation to not require stripping out
- * all non-ASCII but perform more intelligent filtering which would allow UTF or
+ * Ultimately, we'd like to improve the situation to not require replacing all
+ * non-ASCII but perform more intelligent filtering which would allow UTF or
  * similar, but it's unclear exactly what we should allow, so stick to ASCII only
  * for now.
  */
-void
-pg_clean_ascii(char *str)
+char *
+pg_clean_ascii(const char *str, int alloc_flags)
 {
-	/* Only allow clean ASCII chars in the string */
-	char	   *p;
+	size_t		dstlen;
+	char	   *dst;
+	const char *p;
+	size_t		i = 0;
+
+	/* Worst case, each byte can become four bytes, plus a null terminator. */
+	dstlen = strlen(str) * 4 + 1;
+
+#ifdef FRONTEND
+	dst = malloc(dstlen);
+#else
+	dst = palloc_extended(dstlen, alloc_flags);
+#endif
+
+	if (!dst)
+		return NULL;
 
 	for (p = str; *p != '\0'; p++)
 	{
+
+		/* Only allow clean ASCII chars in the string */
 		if (*p < 32 || *p > 126)
-			*p = '?';
+		{
+			Assert(i < (dstlen - 3));
+			snprintf(&dst[i], dstlen - i, "\\x%02x", (unsigned char) *p);
+			i += 4;
+		}
+		else
+		{
+			Assert(i < dstlen);
+			dst[i] = *p;
+			i++;
+		}
 	}
+
+	Assert(i < dstlen);
+	dst[i] = '\0';
+	return dst;
 }
 
 

src/include/common/string.h

@@ -24,7 +24,7 @@ typedef struct PromptInterruptContext
 extern bool pg_str_endswith(const char *str, const char *end);
 extern int	strtoint(const char *pg_restrict str, char **pg_restrict endptr,
 					 int base);
-extern void pg_clean_ascii(char *str);
+extern char *pg_clean_ascii(const char *str, int alloc_flags);
 extern int	pg_strip_crlf(char *str);
 extern bool pg_is_ascii(const char *str);