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MINOR: http: add a new function http_validate_scheme() to validate a scheme

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While http_parse_scheme() extracts a scheme from a URI by extracting
exactly the valid characters and stopping on delimiters, this new
function performs the same on a fixed-size string.
This commit is contained in:
Willy Tarreau 2021-08-10 15:35:36 +02:00
parent c5b5e7b475
commit d3d8d03d98
2 changed files with 24 additions and 0 deletions
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1
include/haproxy/http.h
View File

@ -36,6 +36,7 @@ extern const uint8_t http_char_classes[256];
enum http_meth_t find_http_meth(const char *str, const int len);
int http_get_status_idx(unsigned int status);
const char *http_get_reason(unsigned int status);
int http_validate_scheme(const struct ist schm);
struct ist http_parse_scheme(struct http_uri_parser *parser);
struct ist http_parse_authority(struct http_uri_parser *parser, int no_userinfo);
struct ist http_parse_path(struct http_uri_parser *parser);

23
src/http.c
View File

@ -468,6 +468,29 @@ const char *http_get_reason(unsigned int status)
}
}
/* Returns non-zero if the scheme <schm> is syntactically correct according to
* RFC3986#3.1, otherwise zero. It expects only the scheme and nothing else
* (particularly not the following "://").
* Scheme = alpha *(alpha|digit|'+'|'-'|'.')
*/
int http_validate_scheme(const struct ist schm)
{
size_t i;
for (i = 0; i < schm.len; i++) {
if (likely((schm.ptr[i] >= 'a' && schm.ptr[i] <= 'z') ||
(schm.ptr[i] >= 'A' && schm.ptr[i] <= 'Z')))
continue;
if (unlikely(!i)) // first char must be alpha
return 0;
if ((schm.ptr[i] >= '0' && schm.ptr[i] <= '9') ||
schm.ptr[i] == '+' || schm.ptr[i] == '-' || schm.ptr[i] == '.')
continue;
return 0;
}
return !!i;
}
/* Parse the uri and looks for the scheme. If not found, an empty ist is
* returned. Otherwise, the ist pointing to the scheme is returned.
*