[syslinux:lwip] core: pxe Add native support for http urls
syslinux-bot for Eric W. Biederman
ebiederm at xmission.com
Fri Apr 22 20:06:03 PDT 2011
Commit-ID: 4992782a6f87f02f47306a06249d94c93154b4cd
Gitweb: http://syslinux.zytor.com/commit/4992782a6f87f02f47306a06249d94c93154b4cd
Author: Eric W. Biederman <ebiederm at xmission.com>
AuthorDate: Mon, 11 Apr 2011 04:22:57 -0700
Committer: Eric W. Biederman <ebiederm at xmission.com>
CommitDate: Tue, 12 Apr 2011 14:41:13 -0700
core: pxe Add native support for http urls
Signed-off-by: Eric W. Biederman <ebiederm at xmission.com>
---
core/fs/pxe/http.c | 375 ++++++++++++++++++++++++++++++++++++++++++++++++++++
core/fs/pxe/pxe.c | 1 +
core/fs/pxe/pxe.h | 3 +
3 files changed, 379 insertions(+), 0 deletions(-)
diff --git a/core/fs/pxe/http.c b/core/fs/pxe/http.c
new file mode 100644
index 0000000..6af55d5
--- /dev/null
+++ b/core/fs/pxe/http.c
@@ -0,0 +1,375 @@
+#include <ctype.h>
+#include "pxe.h"
+#include "../../../version.h"
+#include <lwip/api.h>
+
+static void http_close_file(struct inode *inode)
+{
+ struct pxe_pvt_inode *socket = PVT(inode);
+ if (socket->buf) {
+ netbuf_delete(socket->buf);
+ socket->buf = NULL;
+ }
+ if (socket->conn) {
+ netconn_delete(socket->conn);
+ socket->conn = NULL;
+ }
+}
+
+static void http_fill_buffer(struct inode *inode)
+{
+ struct pxe_pvt_inode *socket = PVT(inode);
+ void *data;
+ u16_t len;
+ err_t err;
+
+ /* Clean up or advance an inuse netbuf */
+ if (socket->buf) {
+ if (netbuf_next(socket->buf) < 0) {
+ netbuf_delete(socket->buf);
+ socket->buf = NULL;
+ }
+ }
+ /* If needed get a new netbuf */
+ if (!socket->buf) {
+ socket->buf = netconn_recv(socket->conn);
+ if (!socket->buf) {
+ socket->tftp_goteof = 1;
+ if (inode->size == -1)
+ inode->size = socket->tftp_filepos;
+ http_close_file(inode);
+ return;
+ }
+ }
+ /* Report the current fragment of the netbuf */
+ err = netbuf_data(socket->buf, &data, &len);
+ if (err) {
+ printf("netbuf_data err: %d\n", err);
+ kaboom();
+ }
+ socket->tftp_dataptr = data;
+ socket->tftp_filepos += len;
+ socket->tftp_bytesleft = len;
+ return;
+}
+
+static bool is_tspecial(int ch)
+{
+ bool tspecial = false;
+ switch(ch) {
+ case '(': case ')': case '<': case '>': case '@':
+ case ',': case ';': case ':': case '\\': case '"':
+ case '/': case '[': case ']': case '?': case '=':
+ case '{': case '}': case ' ': case '\t':
+ tspecial = true;
+ break;
+ }
+ return tspecial;
+}
+
+static bool is_ctl(int ch)
+{
+ return ch < 0x20;
+}
+
+static bool is_token(int ch)
+{
+ /* Can by antying except a ctl character or a tspecial */
+ return !is_ctl(ch) && !is_tspecial(ch);
+}
+
+static bool append_ch(char *str, size_t size, size_t *pos, int ch)
+{
+ bool success = true;
+ if ((*pos + 1) >= size) {
+ *pos = 0;
+ success = false;
+ } else {
+ str[*pos] = ch;
+ str[*pos + 1] = '\0';
+ *pos += 1;
+ }
+ return success;
+}
+
+void http_open(struct inode *inode, const char *url)
+{
+ struct pxe_pvt_inode *socket = PVT(inode);
+ char header_buf[512];
+ int header_len;
+ const char *host, *path, *next;
+ size_t host_len;
+ uint16_t port;
+ char field_name[20];
+ char field_value[256];
+ size_t field_name_len, field_value_len;
+ err_t err;
+ enum state {
+ st_httpver,
+ st_stcode,
+ st_skipline,
+ st_fieldfirst,
+ st_fieldname,
+ st_fieldvalue,
+ st_skip_fieldname,
+ st_skip_fieldvalue,
+ st_eoh,
+ } state;
+ struct ip_addr addr;
+ char location[256];
+ uint32_t content_length; /* same as inode->size */
+ size_t response_size;
+ int status;
+ int pos;
+ int redirect_count;
+
+ socket->fill_buffer = http_fill_buffer;
+ socket->close = http_close_file;
+ redirect_count = 0;
+
+restart:
+ /* Reset all of the variables */
+ inode->size = content_length = -1;
+ location[0] = '\0';
+ field_name[0] = '\0';
+ field_value[0] = '\0';
+ field_name_len = 0;
+ field_value_len = 0;
+
+ /* Skip http:// */
+ host = url + 7;
+
+ /* Find the end of the hostname */
+ next = host;
+ while (*next && *next != '/' && *next != ':')
+ next++;
+ host_len = next - host;
+
+ /* Obvious url formatting errors */
+ if (!*next || (!host_len && *next == ':'))
+ goto fail;
+
+ /* Compute the dest port */
+ port = 80;
+ if (*next == ':') {
+ port = 0;
+ for (next++; (*next >= '0' && *next <= '9'); next++)
+ port = (port * 10) * (*next - '0');
+ }
+
+ /* Ensure I have properly parsed the port */
+ if (*next != '/')
+ goto fail;
+
+ path = next;
+
+ /* Resolve the hostname */
+ if (!host_len) {
+ addr.addr = IPInfo.serverip;
+ } else {
+ if (parse_dotquad(host, &addr.addr) != (host + host_len)) {
+ addr.addr = dns_resolv(host);
+ if (!addr.addr)
+ goto fail;
+ }
+ }
+
+ /* Start the http connection */
+ socket->conn = netconn_new(NETCONN_TCP);
+ if (!socket->conn) {
+ printf("netconn_new failed\n");
+ return;
+ }
+
+ err = netconn_connect(socket->conn, &addr, port);
+ if (err) {
+ printf("netconn_connect error %d\n", err);
+ goto fail;
+ }
+
+ header_len = snprintf(header_buf, sizeof header_buf,
+ "GET %s HTTP/1.0\r\n"
+ "Host: %*.*s\r\n"
+ "User-Agent: PXELINUX/%s\r\n"
+ "Connection: close\r\n"
+ "\r\n",
+ path, host_len, host_len, host, VERSION_STR);
+
+ /* If we tried to overflow our buffer abort */
+ if (header_len > sizeof header_buf)
+ goto fail;
+
+ err = netconn_write(socket->conn, header_buf, header_len, NETCONN_NOCOPY);
+ if (err) {
+ printf("netconn_write error %d\n", err);
+ goto fail;
+ }
+
+ /* Parse the HTTP header */
+ state = st_httpver;
+ pos = 0;
+ status = 0;
+ response_size = 0;
+
+ while (state != st_eoh) {
+ int ch = pxe_getc(inode);
+ /* Eof before I finish paring the header */
+ if (ch == -1)
+ goto fail;
+#if 0
+ printf("%c", ch);
+#endif
+ response_size++;
+ if (ch == '\r' || ch == '\0')
+ continue;
+ switch (state) {
+ case st_httpver:
+ if (ch == ' ') {
+ state = st_stcode;
+ pos = 0;
+ }
+ break;
+
+ case st_stcode:
+ if (ch < '0' || ch > '9')
+ goto fail;
+ status = (status*10) + (ch - '0');
+ if (++pos == 3)
+ state = st_skipline;
+ break;
+
+ case st_skipline:
+ if (ch == '\n')
+ state = st_fieldfirst;
+ break;
+
+ case st_fieldfirst:
+ if (ch == '\n')
+ state = st_eoh;
+ else if (isspace(ch)) {
+ /* A continuation line */
+ state = st_fieldvalue;
+ goto fieldvalue;
+ }
+ else if (is_token(ch)) {
+ /* Process the previous field before starting on the next one */
+ if (strcasecmp(field_name, "Content-Length") == 0) {
+ next = field_value;
+ /* Skip leading whitespace */
+ while (isspace(*next))
+ next++;
+ content_length = 0;
+ for (;(*next >= '0' && *next <= '9'); next++) {
+ if ((content_length * 10) < content_length)
+ break;
+ content_length = (content_length * 10) + (*next - '0');
+ }
+ /* In the case of overflow or other error ignore
+ * Content-Length.
+ */
+ if (*next)
+ content_length = -1;
+ }
+ else if (strcasecmp(field_name, "Location") == 0) {
+ next = field_value;
+ /* Skip leading whitespace */
+ while (isspace(*next))
+ next++;
+ strcpy(location, next);
+ }
+ /* Start the field name and field value afress */
+ field_name_len = 1;
+ field_name[0] = ch;
+ field_name[1] = '\0';
+ field_value_len = 0;
+ field_value[0] = '\0';
+ state = st_fieldname;
+ }
+ else /* Bogus try to recover */
+ state = st_skipline;
+ break;
+
+ case st_fieldname:
+ if (ch == ':' ) {
+ state = st_fieldvalue;
+ }
+ else if (is_token(ch)) {
+ if (!append_ch(field_name, sizeof field_name, &field_name_len, ch))
+ state = st_skip_fieldname;
+ }
+ /* Bogus cases try to recover */
+ else if (ch == '\n')
+ state = st_fieldfirst;
+ else
+ state = st_skipline;
+ break;
+
+ case st_fieldvalue:
+ if (ch == '\n')
+ state = st_fieldfirst;
+ else {
+ fieldvalue:
+ if (!append_ch(field_value, sizeof field_value, &field_value_len, ch))
+ state = st_skip_fieldvalue;
+ }
+ break;
+
+ /* For valid fields whose names are longer than I choose to support. */
+ case st_skip_fieldname:
+ if (ch == ':')
+ state = st_skip_fieldvalue;
+ else if (is_token(ch))
+ state = st_skip_fieldname;
+ /* Bogus cases try to recover */
+ else if (ch == '\n')
+ state = st_fieldfirst;
+ else
+ state = st_skipline;
+ break;
+
+ /* For valid fields whose bodies are longer than I choose to support. */
+ case st_skip_fieldvalue:
+ if (ch == '\n')
+ state = st_fieldfirst;
+ break;
+
+ case st_eoh:
+ break; /* Should never happen */
+ }
+ }
+
+ if (state != st_eoh)
+ status = 0;
+
+ switch (status) {
+ case 200:
+ /*
+ * All OK, need to mark header data consumed and set up a file
+ * structure...
+ */
+ /* Treat the remainder of the bytes as data */
+ socket->tftp_filepos -= response_size;
+ break;
+ case 301:
+ case 302:
+ case 303:
+ case 307:
+ /* A redirect */
+ if (!location[0])
+ goto fail;
+ redirect_count++;
+ if (redirect_count > 5)
+ goto fail;
+ url = location;
+ goto restart;
+ break;
+ default:
+ goto fail;
+ break;
+ }
+ return;
+fail:
+ inode->size = 0;
+ http_close_file(inode);
+ return;
+}
diff --git a/core/fs/pxe/pxe.c b/core/fs/pxe/pxe.c
index c173cd0..96c6e7b 100644
--- a/core/fs/pxe/pxe.c
+++ b/core/fs/pxe/pxe.c
@@ -35,6 +35,7 @@ static struct url_open {
const char *scheme;
void (*open)(struct inode *inode, const char *url);
} url_table[] = {
+ { "http", http_open },
{ NULL, NULL },
};
diff --git a/core/fs/pxe/pxe.h b/core/fs/pxe/pxe.h
index 59661bc..f41bf82 100644
--- a/core/fs/pxe/pxe.h
+++ b/core/fs/pxe/pxe.h
@@ -270,4 +270,7 @@ void tftp_open(struct inode *inode, uint32_t ip, uint16_t server_port,
void gpxe_open(struct inode *inode, const char *url);
#define GPXE 1
+/* http.c */
+void http_open(struct inode *inode, const char *url);
+
#endif /* pxe.h */
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