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Add more support for rest emulation.

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Signed-off-by: Pol Henarejos <pol.henarejos@cttc.es>
This commit is contained in:
Pol Henarejos
2026-04-17 16:40:28 +02:00
parent 28aa1f2dcf
commit b244d2a484
2 changed files with 260 additions and 25 deletions
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253
src/usb/lwip/rest_server.c
View File

@@ -1,8 +1,5 @@
#include "rest_server.h"
#include "lwip/tcp.h"
#include "lwip/def.h"
#include <stdbool.h>
#include <ctype.h>
#include <stdint.h>
@@ -11,20 +8,44 @@
#include <string.h>
#include <strings.h>
#ifdef ENABLE_EMULATION
#ifndef _MSC_VER
#include <arpa/inet.h>
#include <errno.h>
#include <netinet/in.h>
#include <pthread.h>
#include <sys/socket.h>
#include <unistd.h>
#endif
#else
#include "lwip/tcp.h"
#include "lwip/def.h"
#endif
#define REST_PORT 80
#define REST_MAX_CONNS 4
#define REST_MAX_REQUEST_SIZE 8192
#define REST_MAX_REQUEST_SIZE 1024
#define REST_MAX_METHOD_SIZE 8
#define REST_MAX_PATH_SIZE 192
typedef struct {
bool in_use;
#ifdef ENABLE_EMULATION
int sock;
#else
struct tcp_pcb *pcb;
#endif
char request[REST_MAX_REQUEST_SIZE + 1];
size_t request_len;
} rest_conn_t;
#ifndef ENABLE_EMULATION
static struct tcp_pcb *listener_pcb = NULL;
#else
static int listener_sock = -1;
#ifndef _MSC_VER
static pthread_t rest_thread;
#endif
#endif
static rest_conn_t conns[REST_MAX_CONNS];
__attribute__((weak)) const rest_route_t *rest_get_routes(size_t *count) {
@@ -34,13 +55,23 @@ __attribute__((weak)) const rest_route_t *rest_get_routes(size_t *count) {
return NULL;
}
static rest_conn_t *alloc_conn(struct tcp_pcb *pcb) {
static rest_conn_t *alloc_conn(
#ifdef ENABLE_EMULATION
int sock
#else
struct tcp_pcb *pcb
#endif
) {
size_t i;
for (i = 0; i < REST_MAX_CONNS; i++) {
if (!conns[i].in_use) {
memset(&conns[i], 0, sizeof(conns[i]));
conns[i].in_use = true;
#ifdef ENABLE_EMULATION
conns[i].sock = sock;
#else
conns[i].pcb = pcb;
#endif
return &conns[i];
}
}
@@ -55,6 +86,17 @@ static void clear_conn(rest_conn_t *conn) {
}
static void close_conn(rest_conn_t *conn) {
#ifdef ENABLE_EMULATION
if (conn == NULL) {
return;
}
if (conn->sock >= 0) {
#ifndef _MSC_VER
(void)close(conn->sock);
#endif
}
clear_conn(conn);
#else
err_t err;
if (conn == NULL || conn->pcb == NULL) {
clear_conn(conn);
@@ -70,13 +112,25 @@ static void close_conn(rest_conn_t *conn) {
tcp_abort(conn->pcb);
}
clear_conn(conn);
#endif
}
static void send_response(rest_conn_t *conn, int status_code, const char *status_text, const char *content_type, const char *body, size_t body_len) {
char headers[256];
int header_len;
#ifdef ENABLE_EMULATION
size_t sent_total = 0;
#else
err_t err;
if (conn == NULL || conn->pcb == NULL) {
#endif
if (
conn == NULL
#ifdef ENABLE_EMULATION
|| conn->sock < 0
#else
|| conn->pcb == NULL
#endif
) {
return;
}
header_len = snprintf(headers, sizeof(headers),
@@ -90,6 +144,33 @@ static void send_response(rest_conn_t *conn, int status_code, const char *status
close_conn(conn);
return;
}
#ifdef ENABLE_EMULATION
while (sent_total < (size_t)header_len) {
#ifndef _MSC_VER
ssize_t n = send(conn->sock, headers + sent_total, (size_t)header_len - sent_total, 0);
#else
int n = -1;
#endif
if (n <= 0) {
close_conn(conn);
return;
}
sent_total += (size_t)n;
}
sent_total = 0;
while (sent_total < body_len) {
#ifndef _MSC_VER
ssize_t n = send(conn->sock, body + sent_total, body_len - sent_total, 0);
#else
int n = -1;
#endif
if (n <= 0) {
close_conn(conn);
return;
}
sent_total += (size_t)n;
}
#else
err = tcp_write(conn->pcb, headers, (uint16_t)header_len, TCP_WRITE_FLAG_COPY);
if (err == ERR_OK && body_len > 0) {
err = tcp_write(conn->pcb, body, (uint16_t)body_len, TCP_WRITE_FLAG_COPY);
@@ -97,6 +178,7 @@ static void send_response(rest_conn_t *conn, int status_code, const char *status
if (err == ERR_OK) {
(void)tcp_output(conn->pcb);
}
#endif
close_conn(conn);
}
@@ -125,7 +207,7 @@ static const char *status_text_from_code(uint16_t code) {
}
}
static int parse_request(rest_conn_t *conn, rest_http_method_t *method, char *path, size_t path_size, rest_request_t *request) {
static int parse_request(rest_conn_t *conn, rest_request_t *request) {
char *header_end, *line_end, *cursor;
size_t headers_size;
unsigned long content_length = 0;
@@ -142,20 +224,20 @@ static int parse_request(rest_conn_t *conn, rest_http_method_t *method, char *pa
return -1;
}
*line_end = '\0';
if (sscanf(conn->request, "%7s %191s", method_str, path) != 2) {
if (sscanf(conn->request, "%7s %191s", method_str, request->path) != 2) {
return -1;
}
if (strcmp(method_str, "GET") == 0) {
*method = REST_HTTP_GET;
request->method = REST_HTTP_GET;
}
else if (strcmp(method_str, "POST") == 0) {
*method = REST_HTTP_POST;
request->method = REST_HTTP_POST;
}
else if (strcmp(method_str, "PUT") == 0) {
*method = REST_HTTP_PUT;
request->method = REST_HTTP_PUT;
}
else if (strcmp(method_str, "DELETE") == 0) {
*method = REST_HTTP_DELETE;
request->method = REST_HTTP_DELETE;
}
else {
return -1;
@@ -210,51 +292,73 @@ static int parse_request(rest_conn_t *conn, rest_http_method_t *method, char *pa
return 1;
}
static int is_json(const char *content_type) {
if (content_type == NULL) {
return 0;
}
return strncasecmp(content_type, "application/json", 16) == 0;
}
static void handle_request(rest_conn_t *conn) {
rest_http_method_t method;
char path[REST_MAX_PATH_SIZE] = {0};
rest_request_t request;
rest_response_t response;
rest_request_t request = {0};
rest_response_t response = {0};
const rest_route_t *routes;
size_t route_count = 0, i;
bool path_exists_for_other_method = false;
int parsed;
parsed = parse_request(conn, &method, path, sizeof(path), &request);
parsed = parse_request(conn, &request);
if (parsed <= 0) {
if (parsed < 0) {
send_json(conn, 400, "Bad Request", "{\"error\":\"bad_request\"}");
}
return;
}
request.method = method;
request.path = path;
if (request.method == REST_HTTP_POST || request.method == REST_HTTP_PUT) {
if (!is_json(request.content_type)) {
send_json(conn, 415, "Unsupported Media Type", "{\"error\":\"content_type_must_be_application_json\"}");
return;
}
}
routes = rest_get_routes(&route_count);
for (i = 0; i < route_count; i++) {
if (routes[i].path == NULL || routes[i].handler == NULL) {
continue;
}
if (strcmp(routes[i].path, path) != 0) {
if (strcmp(routes[i].path, request.path) != 0) {
continue;
}
if (routes[i].method != method) {
if (routes[i].method != request.method) {
path_exists_for_other_method = true;
continue;
}
response.status_code = 200;
response.content_type = "application/json";
response.body = "{\"ok\":true}";
response.body_len = strlen(response.body);
response.json = cJSON_CreateObject();
if (routes[i].handler(&request, &response) != 0) {
send_json(conn, 500, "Internal Server Error", "{\"error\":\"internal_error\"}");
cJSON_Delete(response.json);
return;
}
if (response.content_type == NULL || response.body == NULL) {
send_json(conn, 500, "Internal Server Error", "{\"error\":\"invalid_response\"}");
cJSON_Delete(response.json);
return;
}
response.body = cJSON_PrintUnformatted(response.json);
cJSON_Delete(response.json);
if (response.body == NULL) {
send_json(conn, 500, "Internal Server Error", "{\"error\":\"internal_error\"}");
return;
}
response.status_code = (response.status_code == 0) ? 200 : response.status_code;
response.body_len = (response.body_len == 0) ? strlen(response.body) : response.body_len;
send_response(conn, response.status_code, status_text_from_code(response.status_code), response.content_type, response.body, response.body_len);
if (response.body) {
free(response.body);
}
return;
}
@@ -265,6 +369,7 @@ static void handle_request(rest_conn_t *conn) {
}
}
#ifndef ENABLE_EMULATION
static err_t rest_recv(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err) {
rest_conn_t *conn = (rest_conn_t *)arg;
@@ -355,3 +460,105 @@ err_t rest_server_init(void) {
tcp_accept(listener_pcb, rest_accept);
return ERR_OK;
}
#else
static int emulation_rest_port(void) {
#ifndef _MSC_VER
const char *port_env = getenv("PICO_REST_PORT");
long v;
if (port_env == NULL || *port_env == '\0') {
return REST_PORT;
}
errno = 0;
v = strtol(port_env, NULL, 10);
if (errno != 0 || v < 1 || v > 65535) {
return REST_PORT;
}
return (int)v;
#else
return REST_PORT;
#endif
}
#ifndef _MSC_VER
static void *rest_emulation_thread(void *arg) {
struct sockaddr_in peer;
(void)arg;
while (true) {
socklen_t peer_len = sizeof(peer);
int accepted = accept(listener_sock, (struct sockaddr *)&peer, &peer_len);
rest_conn_t *conn;
if (accepted < 0) {
continue;
}
conn = alloc_conn(accepted);
if (conn == NULL) {
(void)close(accepted);
continue;
}
while (conn->in_use) {
ssize_t n = recv(conn->sock, conn->request + conn->request_len, REST_MAX_REQUEST_SIZE - conn->request_len, 0);
if (n <= 0) {
close_conn(conn);
break;
}
conn->request_len += (size_t)n;
if (conn->request_len > REST_MAX_REQUEST_SIZE) {
send_json(conn, 413, "Payload Too Large", "{\"error\":\"payload_too_large\"}");
break;
}
handle_request(conn);
}
}
return NULL;
}
#endif
err_t rest_server_init(void) {
#ifndef _MSC_VER
struct sockaddr_in addr;
int one = 1;
int port = emulation_rest_port();
if (listener_sock >= 0) {
return ERR_OK;
}
listener_sock = socket(AF_INET, SOCK_STREAM, 0);
if (listener_sock < 0) {
return -1;
}
if (setsockopt(listener_sock, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)) != 0) {
(void)close(listener_sock);
listener_sock = -1;
return -1;
}
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_port = htons((uint16_t)port);
addr.sin_addr.s_addr = htonl(INADDR_ANY);
if (bind(listener_sock, (struct sockaddr *)&addr, sizeof(addr)) != 0) {
(void)close(listener_sock);
listener_sock = -1;
return -1;
}
if (listen(listener_sock, REST_MAX_CONNS) != 0) {
(void)close(listener_sock);
listener_sock = -1;
return -1;
}
if (pthread_create(&rest_thread, NULL, rest_emulation_thread, NULL) != 0) {
(void)close(listener_sock);
listener_sock = -1;
return -1;
}
(void)pthread_detach(rest_thread);
return ERR_OK;
#else
return -1;
#endif
}
int lwip_itf_init(void) {
return rest_server_init();
}
#endif

32
src/usb/lwip/rest_server.h
View File

@@ -1,9 +1,35 @@
/*
* This file is part of the Pico Keys SDK distribution (https://github.com/polhenarejos/pico-keys-sdk).
* Copyright (c) 2022 Pol Henarejos.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, version 3.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef PICO_KEYS_REST_SERVER_H
#define PICO_KEYS_REST_SERVER_H
#ifdef ENABLE_EMULATION
typedef int err_t;
#define ERR_OK 0
#else
#include "lwip/err.h"
#endif
#include <stddef.h>
#include <stdint.h>
#include "cJSON.h"
#define REST_MAX_PATH_SIZE 192
typedef enum {
REST_HTTP_GET = 0,
@@ -14,7 +40,7 @@ typedef enum {
typedef struct {
rest_http_method_t method;
const char *path;
char path[REST_MAX_PATH_SIZE];
const char *body;
size_t body_len;
const char *content_type;
@@ -23,8 +49,9 @@ typedef struct {
typedef struct {
uint16_t status_code;
const char *content_type;
const char *body;
char *body; // heap !
size_t body_len;
cJSON *json;
} rest_response_t;
typedef int (*rest_route_handler_t)(const rest_request_t *request, rest_response_t *response);
@@ -38,5 +65,6 @@ typedef struct {
const rest_route_t *rest_get_routes(size_t *count);
err_t rest_server_init(void);
int lwip_itf_init(void);
#endif