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Changed signature of url_decode(): signalling on destination buffer overflow. mg_get_var() now does not require extra space for variable buffer

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This commit is contained in:
Sergey Lyubka 2012-11-14 09:26:02 -08:00
parent cb62203cf3
commit 080cb2dd4b
2 changed files with 13 additions and 11 deletions
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16
mongoose.c
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@ -1614,10 +1614,9 @@ int mg_printf(struct mg_connection *conn, const char *fmt, ...) {
// form-url-encoded data differs from URI encoding in a way that it
// uses '+' as character for space, see RFC 1866 section 8.2.1
// http://ftp.ics.uci.edu/pub/ietf/html/rfc1866.txt
static size_t url_decode(const char *src, size_t src_len, char *dst,
size_t dst_len, int is_form_url_encoded) {
size_t i, j;
int a, b;
static int url_decode(const char *src, int src_len, char *dst,
int dst_len, int is_form_url_encoded) {
int i, j, a, b;
#define HEXTOI(x) (isdigit(x) ? x - '0' : x - 'W')
for (i = j = 0; i < src_len && j < dst_len - 1; i++, j++) {
@ -1637,7 +1636,7 @@ static size_t url_decode(const char *src, size_t src_len, char *dst,
dst[j] = '\0'; // Null-terminate the destination
return j;
return i >= src_len ? j : -1;
}
// Scan given buffer and fetch the value of the given variable.
@ -1679,9 +1678,7 @@ int mg_get_var(const char *buf, size_t buf_len, const char *name,
assert(s >= p);
// Decode variable into destination buffer
if ((size_t) (s - p) < dst_len) {
len = (int) url_decode(p, (size_t)(s - p), dst, dst_len, 1);
}
len = url_decode(p, (size_t)(s - p), dst, dst_len, 1);
break;
}
}
@ -4052,8 +4049,7 @@ static void handle_request(struct mg_connection *conn) {
* ((char *) conn->request_info.query_string++) = '\0';
}
uri_len = (int) strlen(ri->uri);
url_decode(ri->uri, (size_t)uri_len, (char *) ri->uri,
(size_t) (uri_len + 1), 0);
url_decode(ri->uri, uri_len, (char *) ri->uri, uri_len + 1, 0);
remove_double_dots_and_double_slashes((char *) ri->uri);
convert_uri_to_file_name(conn, path, sizeof(path), &file);
conn->throttle = set_throttle(conn->ctx->config[THROTTLE],

8
test/unit_test.c
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@ -238,7 +238,11 @@ static void test_base64_encode(void) {
}
static void test_mg_get_var(void) {
static const char *post[] = {"a=1&&b=2&d&=&c=3%20&e=", NULL};
static const char *post[] = {
"a=1&&b=2&d&=&c=3%20&e=",
"q=&st=2012%2F11%2F13+17%3A05&et=&team_id=",
NULL
};
char buf[20];
ASSERT(mg_get_var(post[0], strlen(post[0]), "a", buf, sizeof(buf)) == 1);
@ -255,6 +259,8 @@ static void test_mg_get_var(void) {
ASSERT(mg_get_var(post[0], strlen(post[0]), "x", NULL, 10) == -2);
ASSERT(mg_get_var(post[0], strlen(post[0]), "x", buf, 0) == -2);
ASSERT(mg_get_var(post[1], strlen(post[1]), "st", buf, 16) == -1);
ASSERT(mg_get_var(post[1], strlen(post[1]), "st", buf, 17) == 16);
}
static void test_set_throttle(void) {