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Add /vlanlist HTTP endpoint

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Returns a JSON array of all configured VLANs with their IDs and names,
e.g. [{"id":1,"name":""},{"id":20,"name":"IoT"}].

The endpoint iterates VLAN IDs 1..4094 and filters by the validity bit
in sfr_data[0] (0x02), following the same pattern as vlan_create() and
vlan_setup() in rtl837x_port.c.

Also adds a small itoa16_html() helper for emitting decimal numbers
up to 4 digits (analogous to the existing 8-bit itoa_html()), used
for VLAN IDs which can reach 4094. Response builder uses the existing
vlan_name() helper for the name lookup, consistent with send_vlan().

Buffer overflow is prevented by breaking out of the iteration loop at
TCP_OUTBUF_SIZE - 60.

This endpoint is the foundation for upcoming UI improvements
(VLAN selector dropdown and overview table).
This commit is contained in:
Erdnusschokolade
2026-05-24 11:20:57 +02:00
parent 1311cb9ea9
commit a5f77e4caf
3 changed files with 57 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files
httpd/page_impl.c
+54
View File
@@ -97,6 +97,19 @@ void itoa_html(uint8_t v)
char_to_html('0' + (v % 10));
}
void itoa16_html(uint16_t v)
{
uint8_t print_zeros = 0;
uint8_t d;
d = v / 1000;
if (d) { char_to_html('0' + d); print_zeros = 1; }
d = (v / 100) % 10;
if (d || print_zeros) { char_to_html('0' + d); print_zeros = 1; }
d = (v / 10) % 10;
if (d || print_zeros) char_to_html('0' + d);
char_to_html('0' + (v % 10));
}
void string_to_html(__code char *s)
{
while (*s) char_to_html(*s++);
@@ -825,3 +838,44 @@ void send_cmd_log(void)
p = (p + 1) & CMD_HISTORY_MASK;
}
}
void send_vlanlist(void)
{
/* Worst case per entry: {"id":4094,"name":"<name>"}, ~45 bytes.
* HTTP header ~50 bytes. TCP_OUTBUF_SIZE=2500 fits ~53 VLANs safely. */
__xdata uint16_t i;
__xdata uint16_t n;
uint8_t first = 1;
slen = strtox(outbuf, HTTP_RESPONCE_JSON);
char_to_html('[');
for (i = 1; i < 4095; i++) {
if (vlan_get(i) < 0)
continue;
if (!(sfr_data[0] & 0x02))
continue;
if (!first)
char_to_html(',');
first = 0;
slen += strtox(outbuf + slen, "{\"id\":");
itoa16_html(i);
slen += strtox(outbuf + slen, ",\"name\":\"");
n = vlan_name(i);
if (n != 0xffff) {
while (vlan_names[n] && vlan_names[n] != ' ')
char_to_html(vlan_names[n++]);
}
slen += strtox(outbuf + slen, "\"}");
if (slen > TCP_OUTBUF_SIZE - 60)
break;
}
char_to_html(']');
}