[PATCH 08/12] net/httpd: add httpd common code

Mikhail Kshevetskiy mikhail.kshevetskiy at iopsys.eu
Thu Jun 27 13:39:35 CEST 2024


This patch adds HTTP/1.1 compatible web-server that can be used
by other. Server supports GET, POST, and HEAD requests. On client
request it will call user specified GET/POST callback. Then results
will be transmitted to client.

The following restrictions exist on the POST request
at the moment:
  * only multipart/form-data with a single file object
  * object will be stored to a memory area specified in
    image_load_addr variable

Signed-off-by: Mikhail Kshevetskiy <mikhail.kshevetskiy at iopsys.eu>
---
 include/net.h       |   2 +-
 include/net/httpd.h |  64 ++++
 net/Kconfig         |  14 +
 net/Makefile        |   1 +
 net/httpd.c         | 695 ++++++++++++++++++++++++++++++++++++++++++++
 net/net.c           |   6 +
 6 files changed, 781 insertions(+), 1 deletion(-)
 create mode 100644 include/net/httpd.h
 create mode 100644 net/httpd.c

diff --git a/include/net.h b/include/net.h
index 235396a171b..6debbf8ed2a 100644
--- a/include/net.h
+++ b/include/net.h
@@ -516,7 +516,7 @@ extern int		net_restart_wrap;	/* Tried all network devices */
 enum proto_t {
 	BOOTP, RARP, ARP, TFTPGET, DHCP, DHCP6, PING, PING6, DNS, NFS, CDP,
 	NETCONS, SNTP, TFTPSRV, TFTPPUT, LINKLOCAL, FASTBOOT_UDP, FASTBOOT_TCP,
-	WOL, UDP, NCSI, WGET, NETCAT_LOAD, NETCAT_STORE, RS
+	WOL, UDP, NCSI, WGET, NETCAT_LOAD, NETCAT_STORE, HTTPD, RS
 };
 
 extern char	net_boot_file_name[1024];/* Boot File name */
diff --git a/include/net/httpd.h b/include/net/httpd.h
new file mode 100644
index 00000000000..ff0dc93ecf5
--- /dev/null
+++ b/include/net/httpd.h
@@ -0,0 +1,64 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * httpd support header file
+ * Copyright (C) 2024 IOPSYS Software Solutions AB
+ * Author: Mikhail Kshevetskiy <mikhail.kshevetskiy at iopsys.eu>
+ *
+ */
+#ifndef __NET_HTTPD_COMMON_H__
+#define __NET_HTTPD_COMMON_H__
+
+struct http_reply {
+	int		code;
+	const char	*code_msg;
+	const char	*data_type;
+	void		*data;
+	u32		len;
+};
+
+struct httpd_post_data {
+	const char	*name;
+	const char	*filename;
+	void		*addr;
+	u32		size;
+};
+
+enum httpd_req_check {
+	HTTPD_REQ_OK,
+	HTTPD_BAD_URL,
+	HTTPD_BAD_REQ,
+	HTTPD_CLNT_RST
+};
+
+struct httpd_config {
+	enum net_loop_state	(*on_stop)(void);
+	void			(*on_req_end)(void *req_id);
+
+	enum httpd_req_check	(*pre_get)(void *req_id, const char *url);
+	enum httpd_req_check	(*pre_post)(void *req_id, const char *url,
+					    struct httpd_post_data *post);
+
+	struct http_reply *	(*get)(void *req_id, const char *url);
+	struct http_reply *	(*post)(void *req_id, const char *url,
+					struct httpd_post_data *post);
+
+	struct http_reply	*error_400;
+	struct http_reply	*error_404;
+};
+
+/**
+ * httpd_setup() - configure the webserver
+ */
+void httpd_setup(struct httpd_config *config);
+
+/**
+ * httpd_stop() - start stopping of the webserver
+ */
+void httpd_stop(void);
+
+/**
+ * httpd_start() - start the webserver
+ */
+void httpd_start(void);
+
+#endif /* __NET_HTTPD_COMMON_H__ */
diff --git a/net/Kconfig b/net/Kconfig
index 5dff6336293..424c5f0dae8 100644
--- a/net/Kconfig
+++ b/net/Kconfig
@@ -243,6 +243,20 @@ config PROT_TCP_SACK
 	  This option should be turn on if you want to achieve the fastest
 	  file transfer possible.
 
+config HTTPD_COMMON
+	bool "HTTP server common code"
+	depends on PROT_TCP
+	help
+	  HTTP/1.1 compatible web-server common code. It supports standard
+	  GET/POST requests. User MUST provide a configuration to the
+	  web-server. On client request web-server will call user specified
+	  GET/POST callback. Then results will be transmitted to the client.
+	  The following restricions on the POST request are present at the
+	  moment:
+	    * only mulipart/form-data with a single binary object
+	    * object will be stored to a memory area specified in
+	      image_load_addr variable
+
 config IPV6
 	bool "IPv6 support"
 	help
diff --git a/net/Makefile b/net/Makefile
index dac7b4859fb..c1f491fad02 100644
--- a/net/Makefile
+++ b/net/Makefile
@@ -34,6 +34,7 @@ obj-$(CONFIG_PROT_UDP) += udp.o
 obj-$(CONFIG_PROT_TCP) += tcp.o
 obj-$(CONFIG_CMD_WGET) += wget.o
 obj-$(CONFIG_CMD_NETCAT) += netcat.o
+obj-$(CONFIG_HTTPD_COMMON) += httpd.o
 
 # Disable this warning as it is triggered by:
 # sprintf(buf, index ? "foo%d" : "foo", index)
diff --git a/net/httpd.c b/net/httpd.c
new file mode 100644
index 00000000000..31c10843a44
--- /dev/null
+++ b/net/httpd.c
@@ -0,0 +1,695 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * httpd support driver
+ * Copyright (C) 2024 IOPSYS Software Solutions AB
+ * Author: Mikhail Kshevetskiy <mikhail.kshevetskiy at iopsys.eu>
+ */
+
+#include <command.h>
+#include <version.h>
+#include <display_options.h>
+#include <env.h>
+#include <image.h>
+#include <mapmem.h>
+#include <malloc.h>
+#include <net.h>
+#include <net/tcp.h>
+#include <net/httpd.h>
+
+#define HTTP_PORT		80
+
+#define MAX_URL_LEN		128
+#define MAX_BOUNDARY_LEN	80
+#define MAX_MPART_NAME_LEN	80
+#define MAX_FILENAME_LEN	256
+#define BUFFER_LEN		2048
+
+enum http_req_state {
+	ST_REQ_LINE = 0,
+	ST_REQ_HDR,
+	ST_REQ_MPBOUNDARY,
+	ST_REQ_MPART,
+	ST_REQ_MPFILE,
+	ST_REQ_MPEND,
+	ST_REQ_DONE,
+};
+
+enum http_reply_state {
+	ST_REPLY_ERR = 0,
+	ST_REPLY_HDR,
+	ST_REPLY_BODY
+};
+
+enum http_method {
+	HTTP_UNKNOWN = -1,
+	HTTP_GET,
+	HTTP_POST,
+	HTTP_HEAD,
+	HTTP_OPTIONS,
+};
+
+struct httpd_priv {
+	enum http_req_state	req_state;
+	enum http_reply_state	reply_state;
+
+	struct tcp_stream	*tcp;
+
+	enum http_method	method;
+	char			url[MAX_URL_LEN];
+	u32			version_major;
+	u32			version_minor;
+	u32			hdr_len;
+
+	u32			post_fstart;
+	u32			post_flen;
+	char			post_fname[MAX_FILENAME_LEN];
+	char			post_name[MAX_MPART_NAME_LEN];
+	char			post_boundary[MAX_BOUNDARY_LEN];
+
+	int			reply_code;
+	u32			reply_fstart;
+	u32			reply_flen;
+	void			*reply_fdata;
+
+	u32			rx_processed;
+	char			buf[BUFFER_LEN];
+};
+
+static struct http_reply options_reply = {
+	.code      = 200,
+	.code_msg  = "OK",
+	.data_type = "text/plain",
+	.data      = NULL,
+	.len       = 0
+};
+
+static int stop_server;
+static int tsize_num_hash;
+
+static struct httpd_config *cfg;
+
+static void show_block_marker(u32 offs, u32 size)
+{
+	int cnt;
+
+	if (offs > size)
+		offs = size;
+
+	cnt = offs * 50 / size;
+	while (tsize_num_hash < cnt) {
+		putc('#');
+		tsize_num_hash++;
+	}
+
+	if (cnt == 50)
+		putc('\n');
+}
+
+static void tcp_stream_on_closed(struct tcp_stream *tcp)
+{
+	struct httpd_priv *priv = tcp->priv;
+
+	if ((priv->req_state != ST_REQ_DONE) &&
+	    (priv->req_state >= ST_REQ_MPFILE)) {
+		printf("\nHTTPD: transfer was terminated\n");
+	}
+
+	if (cfg->on_req_end != NULL)
+		cfg->on_req_end(tcp->priv);
+
+	free(tcp->priv);
+
+	if (stop_server)
+		net_set_state(cfg->on_stop != NULL ?
+			      cfg->on_stop() :
+			      NETLOOP_SUCCESS);
+}
+
+static void http_make_reply(struct httpd_priv *priv, struct http_reply *reply,
+			    int head_only)
+{
+	int offs = 0;
+
+	if (priv->version_major >= 1) {
+		offs = snprintf(priv->buf, sizeof(priv->buf),
+				"HTTP/%d.%d %d %s\r\n"
+				"Server: %s\r\n"
+				"Connection: close\r\n"
+				"Cache-Control: no-store\r\n"
+				"Content-Type: %s\r\n"
+				"Content-Length: %d\r\n",
+				priv->version_major, priv->version_minor,
+				reply->code, reply->code_msg, U_BOOT_VERSION,
+				reply->data_type,
+				head_only ? 0 : reply->len);
+		if (priv->method == HTTP_OPTIONS)
+			offs += snprintf(priv->buf + offs, sizeof(priv->buf) - offs,
+					"Access-Control-Allow-Methods: GET, HEAD, OPTIONS, POST\r\n");
+		offs += snprintf(priv->buf + offs, sizeof(priv->buf) - offs,
+				"\r\n");
+	}
+
+	priv->reply_code = reply->code;
+	priv->reply_fstart = offs;
+	if (!head_only) {
+		priv->reply_flen = reply->len;
+		priv->reply_fdata = reply->data;
+	}
+}
+
+static enum httpd_req_check http_parse_line(struct httpd_priv *priv, char *line)
+{
+	char			*url, *version, *data, *end;
+	u32			len, tmp;
+	enum httpd_req_check	ret;
+	struct httpd_post_data	post;
+
+	switch (priv->req_state) {
+	case ST_REQ_LINE:
+		if (strncasecmp(line, "GET ", 4) == 0) {
+			priv->method = HTTP_GET;
+			url = line + 4;
+		} else if (strncasecmp(line, "POST ", 5) == 0) {
+			priv->method = HTTP_POST;
+			url = line + 5;
+		} else if (strncasecmp(line, "HEAD ", 5) == 0) {
+			priv->method = HTTP_HEAD;
+			url = line + 5;
+		} else if (strncasecmp(line, "OPTIONS ", 8) == 0) {
+			priv->method = HTTP_OPTIONS;
+			url = line + 8;
+		} else {
+			/* unknown request */
+			return HTTPD_CLNT_RST;
+		}
+
+		version = strstr(url, " ");
+		if (version == NULL) {
+			/* check for HTTP 0.9 */
+			if ((*url != '/') || (priv->method != HTTP_GET))
+				return HTTPD_CLNT_RST;
+
+			if (strlen(url) >= MAX_URL_LEN)
+				return HTTPD_CLNT_RST;
+
+			if (cfg->pre_get != NULL) {
+				ret = cfg->pre_get(priv, url);
+				if (ret != HTTPD_REQ_OK)
+					return ret;
+			}
+
+			priv->req_state = ST_REQ_DONE;
+			priv->hdr_len = strlen(line) + 2;
+			priv->version_major = 0;
+			priv->version_minor = 9;
+			strcpy(priv->url, url);
+			return HTTPD_REQ_OK;
+		}
+
+		if (strncasecmp(version + 1, "HTTP/", 5) != 0) {
+			/* version is required for HTTP >= 1.0 */
+			return HTTPD_CLNT_RST;
+		}
+
+		*version++ = '\0';
+		version += strlen("HTTP/");
+
+		priv->version_major = dectoul(version, &end);
+		switch (*end) {
+		case '\0':
+			priv->version_minor = 0;
+			break;
+		case '.':
+			priv->version_minor = dectoul(end + 1, &end);
+			if (*end == '\0')
+				break;
+			fallthrough;
+		default:
+			/* bad version format */
+			return HTTPD_CLNT_RST;
+		}
+
+		if (priv->version_major < 1) {
+			/* bad version */
+			return HTTPD_CLNT_RST;
+		}
+
+		if ((priv->version_major > 1) || (priv->version_minor > 1)) {
+			/* We support HTTP/1.1 or early standards only */
+			priv->version_major = 1;
+			priv->version_minor = 1;
+		}
+
+		if (*url != '/')
+			return HTTPD_CLNT_RST;
+
+		if (strlen(url) >= MAX_URL_LEN)
+			return HTTPD_CLNT_RST;
+
+		priv->req_state = ST_REQ_HDR;
+		strcpy(priv->url, url);
+		return HTTPD_REQ_OK;
+
+	case ST_REQ_HDR:
+		if (*line == '\0') {
+			priv->hdr_len = priv->rx_processed + 2;
+			switch (priv->method) {
+			case HTTP_GET:
+			case HTTP_HEAD:
+				if (cfg->pre_get != NULL) {
+					ret = cfg->pre_get(priv, priv->url);
+					if (ret != HTTPD_REQ_OK)
+						return ret;
+				}
+				fallthrough;
+
+			case HTTP_OPTIONS:
+				priv->req_state = ST_REQ_DONE;
+				return HTTPD_REQ_OK;
+
+			default:
+				break;
+			}
+
+			if (*priv->post_boundary != '\0') {
+				priv->req_state = ST_REQ_MPBOUNDARY;
+				return HTTPD_REQ_OK;
+			}
+			/* NOT multipart/form-data POST request */
+			return HTTPD_BAD_REQ;
+		}
+
+		if (priv->method != HTTP_POST)
+			return HTTPD_REQ_OK;
+
+		len = strlen("Content-Length: ");
+		if (strncasecmp(line, "Content-Length: ", len) == 0) {
+			data = line + len;
+			priv->post_flen = simple_strtol(data, &end, 10);
+			if (*end != '\0') {
+				/* bad Content-Length string */
+				return HTTPD_BAD_REQ;
+			}
+			return HTTPD_REQ_OK;
+		}
+
+		len = strlen("Content-Type: ");
+		if (strncasecmp(line, "Content-Type: ", len) == 0) {
+			data = strstr(line + len, " boundary=");
+			if (data == NULL) {
+				/* expect multipart/form-data format */
+				return HTTPD_BAD_REQ;
+			}
+
+			data += strlen(" boundary=");
+			if (strlen(data) >= sizeof(priv->post_boundary)) {
+				/* no space to keep boundary */
+				return HTTPD_BAD_REQ;
+			}
+
+			strcpy(priv->post_boundary, data);
+			return HTTPD_REQ_OK;
+		}
+
+		return HTTPD_REQ_OK;
+
+	case ST_REQ_MPBOUNDARY:
+		if (*line == '\0')
+			return HTTPD_REQ_OK;
+		if ((line[0] != '-') || (line[1] != '-') ||
+		    (strcmp(line + 2, priv->post_boundary) != 0)) {
+			/* expect boundary line */
+			return HTTPD_BAD_REQ;
+		}
+		priv->req_state = ST_REQ_MPART;
+		return HTTPD_REQ_OK;
+
+	case ST_REQ_MPART:
+		if (*line == '\0') {
+			if (*priv->post_name == '\0')
+				return HTTPD_BAD_REQ;
+
+			priv->post_fstart = priv->rx_processed + 2;
+			priv->post_flen -= priv->post_fstart - priv->hdr_len;
+			/* expect: "\r\n--${boundary}--\r\n", so strlen() + 8 */
+			priv->post_flen -= strlen(priv->post_boundary) + 8;
+
+			if (cfg->pre_post != NULL) {
+				post.addr     = NULL;
+				post.name     = priv->post_name;
+				post.filename = priv->post_fname;
+				post.size     = priv->post_flen;
+
+				ret = cfg->pre_post(priv, priv->url, &post);
+				if (ret != HTTPD_REQ_OK)
+					return ret;
+			}
+
+			tsize_num_hash = 0;
+			printf("File: %s, %u bytes\n", priv->post_fname, priv->post_flen);
+			printf("Loading: ");
+
+			priv->req_state = ST_REQ_MPFILE;
+			return HTTPD_REQ_OK;
+		}
+
+		len = strlen("Content-Disposition: ");
+		if (strncasecmp(line, "Content-Disposition: ", len) == 0) {
+			data = strstr(line + len, " name=\"");
+			if (data == NULL) {
+				/* name attribute not found */
+				return HTTPD_BAD_REQ;
+			}
+
+			data += strlen(" name=\"");
+			end = strstr(data, "\"");
+			if (end == NULL) {
+				/* bad name attribute format */
+				return HTTPD_BAD_REQ;
+			}
+
+			tmp = end - data;
+			if (tmp >= sizeof(priv->post_name)) {
+				/* multipart name is too long */
+				return HTTPD_BAD_REQ;
+			}
+			strncpy(priv->post_name, data, tmp);
+			priv->post_name[tmp] = '\0';
+
+			data = strstr(line + len, " filename=\"");
+			if (data == NULL) {
+				/* filename attribute not found */
+				return HTTPD_BAD_REQ;
+			}
+
+			data += strlen(" filename=\"");
+			end = strstr(data, "\"");
+			if (end == NULL) {
+				/* bad filename attribute format */
+				return HTTPD_BAD_REQ;
+			}
+
+			tmp = end - data;
+			if (tmp >= sizeof(priv->post_fname))
+				tmp = sizeof(priv->post_fname) - 1;
+			strncpy(priv->post_fname, data, tmp);
+			priv->post_fname[tmp] = '\0';
+			return HTTPD_REQ_OK;
+		}
+
+		return HTTPD_REQ_OK;
+
+	case ST_REQ_MPEND:
+		if (*line == '\0')
+			return HTTPD_REQ_OK;
+
+		len = strlen(priv->post_boundary);
+		if ((line[0] != '-') || (line[1] != '-') ||
+		    (strncmp(line + 2, priv->post_boundary, len) != 0) ||
+		    (line[len + 2] != '-') || (line[len + 3] != '-') ||
+		    (line[len + 4] != '\0')) {
+			/* expect final boundary line */
+			return HTTPD_BAD_REQ;
+		}
+		priv->req_state = ST_REQ_DONE;
+		return HTTPD_REQ_OK;
+
+	default:
+		return HTTPD_BAD_REQ;
+	}
+}
+
+static enum httpd_req_check http_parse_buf(struct httpd_priv *priv,
+					   char *buf, u32 size)
+{
+	char			*eol_pos;
+	u32			len;
+	enum httpd_req_check	ret;
+
+	buf[size] = '\0';
+	while (size > 0) {
+		eol_pos = strstr(buf, "\r\n");
+		if (eol_pos == NULL)
+			break;
+
+		*eol_pos = '\0';
+		len = eol_pos + 2 - buf;
+
+		ret = http_parse_line(priv, buf);
+		if (ret != HTTPD_REQ_OK) {
+			/* request processing error */
+			return ret;
+		}
+
+		priv->rx_processed += len;
+		buf += len;
+		size -= len;
+
+		if ((priv->req_state == ST_REQ_MPFILE) ||
+		    (priv->req_state == ST_REQ_DONE))
+			return HTTPD_REQ_OK;
+	}
+	/* continue when more data becomes available */
+	return HTTPD_REQ_OK;
+}
+
+static void tcp_stream_on_rcv_nxt_update(struct tcp_stream *tcp, u32 rx_bytes)
+{
+	struct httpd_priv	*priv;
+	void			*ptr;
+	u32			shift, size;
+	enum httpd_req_check	ret;
+	struct http_reply	*reply;
+	struct httpd_post_data	post;
+
+	priv = tcp->priv;
+
+	switch (priv->req_state) {
+	case ST_REQ_DONE:
+		return;
+
+	case ST_REQ_MPFILE:
+		show_block_marker(rx_bytes - priv->post_fstart,
+				  priv->post_flen);
+		if (rx_bytes < priv->post_fstart + priv->post_flen) {
+			priv->rx_processed = rx_bytes;
+			return;
+		}
+		priv->req_state = ST_REQ_MPEND;
+		priv->rx_processed = priv->post_fstart + priv->post_flen;
+		fallthrough;
+
+	case ST_REQ_MPEND:
+		shift = priv->rx_processed - priv->post_fstart;
+		ptr = map_sysmem(image_load_addr + shift,
+				 rx_bytes - priv->rx_processed);
+		ret = http_parse_buf(priv, ptr,
+				     rx_bytes - priv->rx_processed);
+		unmap_sysmem(ptr);
+
+		if (ret != HTTPD_REQ_OK)
+			goto error;
+		if (priv->req_state != ST_REQ_DONE)
+			return;
+		break;
+
+	default:
+		ret = http_parse_buf(priv, priv->buf + priv->rx_processed,
+				     rx_bytes - priv->rx_processed);
+		if (ret != HTTPD_REQ_OK)
+			goto error;
+
+		if (priv->req_state == ST_REQ_MPFILE) {
+			/*
+			 * We just switched from parsing of HTTP request
+			 * headers to binary data reading. Our tcp->rx
+			 * handler may put some binary data to priv->buf.
+			 * It's time to copy these data to a proper place.
+			 * It's required to copy whole buffer data starting
+			 * from priv->rx_processed position. Otherwise we
+			 * may miss data placed after the first hole.
+			 */
+			size = sizeof(priv->buf) - priv->rx_processed;
+			if (size > 0) {
+				ptr = map_sysmem(image_load_addr, size);
+				memcpy(ptr, priv->buf + priv->rx_processed, size);
+				unmap_sysmem(ptr);
+			}
+
+			show_block_marker(rx_bytes - priv->post_fstart,
+					  priv->post_flen);
+		}
+
+		if (priv->req_state != ST_REQ_DONE)
+			return;
+		break;
+	}
+
+	switch (priv->method) {
+	case HTTP_OPTIONS:
+		reply = &options_reply;
+		break;
+
+	case HTTP_GET:
+	case HTTP_HEAD:
+		if (cfg->get == NULL) {
+			ret = HTTPD_BAD_REQ;
+			goto error;
+		}
+		reply = cfg->get(priv, priv->url);
+		break;
+
+	case HTTP_POST:
+		if (cfg->post == NULL) {
+			ret = HTTPD_BAD_REQ;
+			goto error;
+		}
+		post.name     = priv->post_name;
+		post.filename = priv->post_fname;
+		post.size     = priv->post_flen;
+		post.addr     = map_sysmem(image_load_addr, post.size);
+		reply = cfg->post(priv, priv->url, &post);
+		unmap_sysmem(post.addr);
+		break;
+
+	default:
+		ret = HTTPD_BAD_REQ;
+		goto error;
+	}
+
+	http_make_reply(priv, reply, priv->method == HTTP_HEAD);
+	return;
+
+error:
+	priv->req_state = ST_REQ_DONE;
+	switch (ret) {
+	case HTTPD_BAD_URL:
+		http_make_reply(priv, cfg->error_404, 0);
+		break;
+	case HTTPD_BAD_REQ:
+		http_make_reply(priv, cfg->error_400, 0);
+		break;
+	default:
+		tcp_stream_reset(tcp);
+		break;
+	}
+}
+
+static u32 tcp_stream_rx(struct tcp_stream *tcp, u32 rx_offs, void *buf, u32 len)
+{
+	void			*ptr;
+	struct httpd_priv	*priv;
+	u32			shift;
+
+	priv = tcp->priv;
+	switch (priv->req_state) {
+	case ST_REQ_DONE:
+		return len;
+	case ST_REQ_MPFILE:
+	case ST_REQ_MPEND:
+		shift = rx_offs - priv->post_fstart;
+		ptr = map_sysmem(image_load_addr + shift, len);
+		memcpy(ptr, buf, len);
+		unmap_sysmem(ptr);
+		return len;
+	default:
+		/*
+		 * accept data that fits to buffer,
+		 * reserve space for end of line symbol
+		 */
+		if (rx_offs + len > sizeof(priv->buf) - 1)
+			len = sizeof(priv->buf) - rx_offs - 1;
+		memcpy(priv->buf + rx_offs, buf, len);
+		return len;
+	}
+}
+
+static void tcp_stream_on_snd_una_update(struct tcp_stream *tcp, u32 tx_bytes)
+{
+	struct httpd_priv *priv;
+
+	priv = tcp->priv;
+	if ((priv->req_state == ST_REQ_DONE) &&
+	    (tx_bytes == priv->reply_fstart + priv->reply_flen))
+		tcp_stream_close(tcp);
+}
+
+static u32 tcp_stream_tx(struct tcp_stream *tcp, u32 tx_offs, void *buf, u32 maxlen)
+{
+	struct httpd_priv	*priv;
+	u32			len, bytes = 0;
+	char			*ptr;
+
+	priv = tcp->priv;
+	if (priv->req_state != ST_REQ_DONE)
+		return 0;
+
+	if (tx_offs < priv->reply_fstart) {
+		len = maxlen;
+		if (len > priv->reply_fstart - tx_offs)
+			len = priv->reply_fstart - tx_offs;
+		memcpy(buf, priv->buf + tx_offs, len);
+		buf += len;
+		tx_offs += len;
+		bytes += len;
+		maxlen -= len;
+	}
+
+	if (tx_offs >= priv->reply_fstart) {
+		if (tx_offs + maxlen > priv->reply_fstart + priv->reply_flen)
+			maxlen = priv->reply_fstart + priv->reply_flen - tx_offs;
+		if (maxlen > 0) {
+			ptr = priv->reply_fdata + tx_offs - priv->reply_fstart;
+			memcpy(buf, ptr, maxlen);
+			bytes += maxlen;
+		}
+	}
+
+	return bytes;
+}
+
+static int tcp_stream_on_create(struct tcp_stream *tcp)
+{
+	struct httpd_priv	*priv;
+
+	if ((cfg == NULL) || stop_server ||
+	    (tcp->lport != HTTP_PORT))
+		return 0;
+
+	priv = malloc(sizeof(struct httpd_priv));
+	if (priv == NULL)
+		return 0;
+
+	memset(priv, 0, sizeof(struct httpd_priv));
+	priv->tcp = tcp;
+
+	tcp->priv = priv;
+	tcp->on_closed = tcp_stream_on_closed;
+	tcp->on_rcv_nxt_update = tcp_stream_on_rcv_nxt_update;
+	tcp->rx = tcp_stream_rx;
+	tcp->on_snd_una_update = tcp_stream_on_snd_una_update;
+	tcp->tx = tcp_stream_tx;
+	return 1;
+}
+
+void httpd_setup(struct httpd_config *config)
+{
+	cfg = config;
+}
+
+void httpd_stop(void)
+{
+	stop_server = 1;
+}
+
+void httpd_start(void)
+{
+	if (cfg == NULL) {
+		net_set_state(NETLOOP_FAIL);
+		return;
+	}
+	stop_server = 0;
+	memset(net_server_ethaddr, 0, 6);
+	tcp_stream_set_on_create_handler(tcp_stream_on_create);
+	printf("HTTPD listening on port %d...\n", HTTP_PORT);
+}
diff --git a/net/net.c b/net/net.c
index 809fe5c4792..ca761c57372 100644
--- a/net/net.c
+++ b/net/net.c
@@ -111,6 +111,7 @@
 #include <net/tcp.h>
 #include <net/wget.h>
 #include <net/netcat.h>
+#include <net/httpd.h>
 #include "arp.h"
 #include "bootp.h"
 #include "cdp.h"
@@ -575,6 +576,11 @@ restart:
 			netcat_store_start();
 			break;
 #endif
+#if defined(CONFIG_HTTPD_COMMON)
+		case HTTPD:
+			httpd_start();
+			break;
+#endif
 #if defined(CONFIG_CMD_CDP)
 		case CDP:
 			cdp_start();
-- 
2.43.0



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