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manager.c: Generate valid XML if attribute names have leading digits.

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The XML Manager Event Interface (amxml) now generates attribute names
that are compliant with the XML 1.1 specification. Previously, an
attribute name that started with a digit would be rendered as-is, even
though attribute names must not begin with a digit. We now prefix
attribute names that start with a digit with an underscore ('_') to
prevent XML validation failures.

This is not backwards compatible but my assumption is that compliant
XML parsers would already have been complaining about this.

ASTERISK-29886 #close

Change-Id: Icfaa56a131a082d803e9b7db5093806d455a0523
This commit is contained in:
Sean Bright
2022-01-31 13:52:26 -05:00
committed by Friendly Automation
parent 3d390c4df7
commit b42dd930f4
2 changed files with 22 additions and 4 deletions
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8
doc/UPGRADE-staging/manager_amxml_attribute_fix.txt Normal file
View File

@@ -0,0 +1,8 @@
Subject: AMI
The XML Manager Event Interface (amxml) now generates attribute names
that are compliant with the XML 1.1 specification. Previously, an
attribute name that started with a digit would be rendered as-is, even
though attribute names must not begin with a digit. We now prefix
attribute names that start with a digit with an underscore ('_') to
prevent XML validation failures.

12
main/manager.c
View File

@@ -7639,6 +7639,7 @@ static void xml_copy_escape(struct ast_str **out, const char *src, int mode)
/* store in a local buffer to avoid calling ast_str_append too often */
char buf[256];
char *dst = buf;
const char *save = src;
int space = sizeof(buf);
/* repeat until done and nothing to flush */
for ( ; *src || dst != buf ; src++) {
@@ -7652,11 +7653,20 @@ static void xml_copy_escape(struct ast_str **out, const char *src, int mode)
}
}
if ( (mode & 2) && !isalnum(*src)) {
if (mode & 2) {
if (save == src && isdigit(*src)) {
/* The first character of an XML attribute cannot be a digit */
*dst++ = '_';
*dst++ = *src;
space -= 2;
continue;
} else if (!isalnum(*src)) {
/* Replace non-alphanumeric with an underscore */
*dst++ = '_';
space--;
continue;
}
}
switch (*src) {
case '<':
strcpy(dst, "&lt;");