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improve http header parsing,

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improve http server handling
This commit is contained in:
Arthur Lu 2024-03-01 14:00:01 -08:00
parent bc52e60153
commit 14535b7f86
1 changed files with 85 additions and 72 deletions
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157
http_serv.h
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@ -21,8 +21,13 @@ typedef struct TCP_SERVER_T_ {
typedef struct TCP_CONNECT_STATE_T_ {
struct tcp_pcb * pcb;
int sent_len;
char headers[128];
char result[256];
char method[8];
char request[128];
char params[128];
char protocol[8];
char headers[1024];
char body[128];
char result[128];
int header_len;
int result_len;
ip_addr_t * gw;
@ -70,14 +75,14 @@ static err_t tcp_server_sent(void * arg, struct tcp_pcb * pcb, u16_t len) {
return ERR_OK;
}
static int handle_status_get (const char * request, const char * params, char * result, size_t max_result_len) {
static int handle_status_get (const char * request, const char * params, const char * body, char * result, size_t max_result_len) {
return snprintf(result, max_result_len, "{volt: %f, temp: %f, power: %d}", current_state.voltage, current_state.tempC, current_state.power_state);
}
static int handle_power_post (const char * request, const char * params, char * result, size_t max_result_len) {
if (params) {
static int handle_power_post (const char * request, const char * params, const char * body, char * result, size_t max_result_len) {
if (strstr(body, "requested_state")) {
int requested_power_state_int;
int led_param = sscanf(params, "requested_state=%d", &requested_power_state_int);
int led_param = sscanf(body, "requested_state=%d", &requested_power_state_int);
if (led_param) {
if (requested_power_state_int == 0 || requested_power_state_int == 1) {
bmc_power_handler((bool) requested_power_state_int);
@ -96,6 +101,68 @@ static int handle_power_post (const char * request, const char * params, char *
}
}
int parse_content (struct pbuf * p, TCP_CONNECT_STATE_T * con_state) {
char content[2048] = {0};
pbuf_copy_partial(p, &content, 2048 - 1, 0);
char * headers_start = content; // First header line containing method request?params HTTP/protocol
char * headers_other = strstr(content, "\r\n") + 2; // remaining headers follow the first line
char * body_start = strstr(content, "\r\n\r\n") + 4; // body begins at the end of headers
*(headers_other - 2) = 0;
*(body_start - 4) = 0;
char request_params_comb[256];
if (sscanf(headers_start, "%s %s HTTP/%s", con_state->method, request_params_comb, con_state->protocol) != 3) {
return 0;
}
char * params = strchr(request_params_comb, '?');
if (params) {
*params++ = 0;
strcpy(con_state->request, request_params_comb);
strcpy(con_state->params, params);
}
else {
strcpy(con_state->request, request_params_comb);
}
strcpy(con_state->headers, headers_other);
strcpy(con_state->body, body_start);
return 1;
}
int send_response (TCP_CONNECT_STATE_T * con_state, struct tcp_pcb * pcb) {
// Check result buffer size
if (con_state->result_len > sizeof(con_state->result) - 1) {
DEBUG_printf("[HTTP] [ERR] Too much result data %d\n", con_state->result_len);
return tcp_close_client_connection(con_state, pcb, ERR_CLSD);
}
// Check header buffer size
if (con_state->header_len > sizeof(con_state->headers) - 1) {
DEBUG_printf("[HTTP] [ERR] Too much header data %d\n", con_state->header_len);
return tcp_close_client_connection(con_state, pcb, ERR_CLSD);
}
// Send the headers to the client
con_state->sent_len = 0;
err_t err = tcp_write(pcb, con_state->headers, con_state->header_len, 0);
if (err != ERR_OK) {
DEBUG_printf("[HTTP] [ERR] Failed to write header data %d\n", err);
return tcp_close_client_connection(con_state, pcb, err);
}
// Send the body to the client
if (con_state->result_len) {
err = tcp_write(pcb, con_state->result, con_state->result_len, 0);
if (err != ERR_OK) {
DEBUG_printf("[HTTP] [ERR] Failed to write result data %d\n", err);
return tcp_close_client_connection(con_state, pcb, err);
}
}
return 0;
}
err_t tcp_server_recv(void * arg, struct tcp_pcb * pcb, struct pbuf * p, err_t err) {
TCP_CONNECT_STATE_T * con_state = (TCP_CONNECT_STATE_T *)arg;
if (!p) {
@ -106,56 +173,25 @@ err_t tcp_server_recv(void * arg, struct tcp_pcb * pcb, struct pbuf * p, err_t e
if (p->tot_len > 0) {
DEBUG_printf("[HTTP] [OK ] Server recieved %d err %d\n", p->tot_len, err);
// Copy the request into the buffer
pbuf_copy_partial(p, con_state->headers, p->tot_len > sizeof(con_state->headers) - 1 ? sizeof(con_state->headers) - 1 : p->tot_len, 0);
// parse header, should probably put this into a separate method
char * method = con_state->headers;
char * request = NULL;
if (strncmp(method, HTTP_GET, sizeof(HTTP_GET) - 1) == 0) {
*(con_state->headers + sizeof(HTTP_GET) - 1) = 0;
request = con_state->headers + sizeof(HTTP_GET); // + space
}
else if (strncmp(method, HTTP_POST, sizeof(HTTP_POST) - 1) == 0) {
*(con_state->headers + sizeof(HTTP_POST) - 1) = 0;
request = con_state->headers + sizeof(HTTP_POST); // + space
}
char * params = strchr(request, '?');
if (params) {
if (*params) {
char * space = strchr(request, ' ');
*params++ = 0;
if (space) {
*space = 0;
}
} else {
params = NULL;
}
}
else {
char * space = strchr(request, ' ');
if (space) {
*space = 0;
}
}
if (!parse_content(p, con_state)) {
DEBUG_printf("[HTTP] [ERR] Failed to parse header\n");
return tcp_close_client_connection(con_state, pcb, ERR_OK);
}
// print request
if (params) {
DEBUG_printf("[HTTP] [OK ] Request: %s %s?%s\n", method, request, params);
}
else {
DEBUG_printf("[HTTP] [OK ] Request: %s %s\n", method, request);
}
DEBUG_printf("[HTTP] [OK ] Request: %s %s?%s %s\n", con_state->method, con_state->request, con_state->params, con_state->body);
int response_code;
// parse request depending on method and request
if (strncmp(method, HTTP_GET, sizeof(HTTP_GET) - 1) == 0 && strncmp(request, "/status", sizeof("/status") - 1) == 0) {
con_state->result_len = handle_status_get(request, params, con_state->result, sizeof(con_state->result));
if (strncmp(con_state->method, HTTP_GET, sizeof(HTTP_GET) - 1) == 0 && strncmp(con_state->request, "/status", sizeof("/status") - 1) == 0) {
con_state->result_len = handle_status_get(con_state->request, con_state->params, con_state->body, con_state->result, sizeof(con_state->result));
response_code = 200;
con_state->header_len = snprintf(con_state->headers, sizeof(con_state->headers), HTTP_RESPONSE_HEADER, response_code, con_state->result_len);
}
else if (strncmp(method, HTTP_POST, sizeof(HTTP_POST) - 1) == 0 && strncmp(request, "/power", sizeof("/power") - 1) == 0) {
con_state->result_len = handle_power_post(request, params, con_state->result, sizeof(con_state->result));
else if (strncmp(con_state->method, HTTP_POST, sizeof(HTTP_POST) - 1) == 0 && strncmp(con_state->request, "/power", sizeof("/power") - 1) == 0) {
con_state->result_len = handle_power_post(con_state->request, con_state->params, con_state->body, con_state->result, sizeof(con_state->result));
response_code = 200;
con_state->header_len = snprintf(con_state->headers, sizeof(con_state->headers), HTTP_RESPONSE_HEADER, response_code, con_state->result_len);
}
@ -168,31 +204,8 @@ err_t tcp_server_recv(void * arg, struct tcp_pcb * pcb, struct pbuf * p, err_t e
// print result
DEBUG_printf("[HTTP] [OK ] Result: %d %s\n", response_code, con_state->result);
// Check result buffer size
if (con_state->result_len > sizeof(con_state->result) - 1) {
DEBUG_printf("[HTTP] [ERR] Too much result data %d\n", con_state->result_len);
return tcp_close_client_connection(con_state, pcb, ERR_CLSD);
}
// Check header buffer size
if (con_state->header_len > sizeof(con_state->headers) - 1) {
DEBUG_printf("[HTTP] [ERR] Too much header data %d\n", con_state->header_len);
return tcp_close_client_connection(con_state, pcb, ERR_CLSD);
}
// Send the headers to the client
con_state->sent_len = 0;
err_t err = tcp_write(pcb, con_state->headers, con_state->header_len, 0);
if (err != ERR_OK) {
DEBUG_printf("[HTTP] [ERR] Failed to write header data %d\n", err);
return tcp_close_client_connection(con_state, pcb, err);
}
// Send the body to the client
if (con_state->result_len) {
err = tcp_write(pcb, con_state->result, con_state->result_len, 0);
if (err != ERR_OK) {
DEBUG_printf("[HTTP] [ERR] Failed to write result data %d\n", err);
return tcp_close_client_connection(con_state, pcb, err);
}
if (send_response(con_state, pcb)) {
DEBUG_printf("[HTTP] [ERR] Failure in send\n");
}
tcp_recved(pcb, p->tot_len);