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mg_http.c
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/*
* Copyright (c) 2014 Cesanta Software Limited
* All rights reserved
*/
#if MG_ENABLE_HTTP
#include "common/cs_md5.h"
#include "mg_internal.h"
#include "mg_util.h"
/* altbuf {{{ */
/*
* Alternate buffer: fills the client-provided buffer with data; and if it's
* not large enough, allocates another buffer (via mbuf), similar to asprintf.
*/
struct altbuf {
struct mbuf m;
char *user_buf;
size_t len;
size_t user_buf_size;
};
/*
* Initializes altbuf; `buf`, `buf_size` is the client-provided buffer.
*/
MG_INTERNAL void altbuf_init(struct altbuf *ab, char *buf, size_t buf_size) {
mbuf_init(&ab->m, 0);
ab->user_buf = buf;
ab->user_buf_size = buf_size;
ab->len = 0;
}
/*
* Appends a single char to the altbuf.
*/
MG_INTERNAL void altbuf_append(struct altbuf *ab, char c) {
if (ab->len < ab->user_buf_size) {
/* The data fits into the original buffer */
ab->user_buf[ab->len++] = c;
} else {
/* The data can't fit into the original buffer, so write it to mbuf. */
/*
* First of all, see if that's the first byte which overflows the original
* buffer: if so, copy the existing data from there to a newly allocated
* mbuf.
*/
if (ab->len > 0 && ab->m.len == 0) {
mbuf_append(&ab->m, ab->user_buf, ab->len);
}
mbuf_append(&ab->m, &c, 1);
ab->len = ab->m.len;
}
}
/*
* Resets any data previously appended to altbuf.
*/
MG_INTERNAL void altbuf_reset(struct altbuf *ab) {
mbuf_free(&ab->m);
ab->len = 0;
}
/*
* Returns whether the additional buffer was allocated (and thus the data
* is in the mbuf, not the client-provided buffer)
*/
MG_INTERNAL int altbuf_reallocated(struct altbuf *ab) {
return ab->len > ab->user_buf_size;
}
/*
* Returns the actual buffer with data, either the client-provided or a newly
* allocated one. If `trim` is non-zero, mbuf-backed buffer is trimmed first.
*/
MG_INTERNAL char *altbuf_get_buf(struct altbuf *ab, int trim) {
if (altbuf_reallocated(ab)) {
if (trim) {
mbuf_trim(&ab->m);
}
return ab->m.buf;
} else {
return ab->user_buf;
}
}
/* }}} */
static const char *mg_version_header = "Mongoose/" MG_VERSION;
enum mg_http_proto_data_type { DATA_NONE, DATA_FILE, DATA_PUT };
struct mg_http_proto_data_file {
FILE *fp; /* Opened file. */
int64_t cl; /* Content-Length. How many bytes to send. */
int64_t sent; /* How many bytes have been already sent. */
int keepalive; /* Keep connection open after sending. */
enum mg_http_proto_data_type type;
};
#if MG_ENABLE_HTTP_CGI
struct mg_http_proto_data_cgi {
struct mg_connection *cgi_nc;
};
#endif
struct mg_http_proto_data_chuncked {
int64_t body_len; /* How many bytes of chunked body was reassembled. */
};
struct mg_http_endpoint {
struct mg_http_endpoint *next;
struct mg_str uri_pattern; /* owned */
char *auth_domain; /* owned */
char *auth_file; /* owned */
mg_event_handler_t handler;
#if MG_ENABLE_CALLBACK_USERDATA
void *user_data;
#endif
};
enum mg_http_multipart_stream_state {
MPS_BEGIN,
MPS_WAITING_FOR_BOUNDARY,
MPS_WAITING_FOR_CHUNK,
MPS_GOT_BOUNDARY,
MPS_FINALIZE,
MPS_FINISHED
};
struct mg_http_multipart_stream {
const char *boundary;
int boundary_len;
const char *var_name;
const char *file_name;
void *user_data;
enum mg_http_multipart_stream_state state;
int processing_part;
int data_avail;
};
struct mg_reverse_proxy_data {
struct mg_connection *linked_conn;
};
struct mg_ws_proto_data {
/*
* Defragmented size of the frame so far.
*
* First byte of nc->recv_mbuf.buf is an op, the rest of the data is
* defragmented data.
*/
size_t reass_len;
};
struct mg_http_proto_data {
#if MG_ENABLE_FILESYSTEM
struct mg_http_proto_data_file file;
#endif
#if MG_ENABLE_HTTP_CGI
struct mg_http_proto_data_cgi cgi;
#endif
#if MG_ENABLE_HTTP_STREAMING_MULTIPART
struct mg_http_multipart_stream mp_stream;
#endif
#if MG_ENABLE_HTTP_WEBSOCKET
struct mg_ws_proto_data ws_data;
#endif
struct mg_http_proto_data_chuncked chunk;
struct mg_http_endpoint *endpoints;
mg_event_handler_t endpoint_handler;
struct mg_reverse_proxy_data reverse_proxy_data;
size_t rcvd; /* How many bytes we have received. */
};
static void mg_http_proto_data_destructor(void *proto_data);
struct mg_connection *mg_connect_http_base(
struct mg_mgr *mgr, MG_CB(mg_event_handler_t ev_handler, void *user_data),
struct mg_connect_opts opts, const char *scheme1, const char *scheme2,
const char *scheme_ssl1, const char *scheme_ssl2, const char *url,
struct mg_str *path, struct mg_str *user_info, struct mg_str *host);
MG_INTERNAL struct mg_http_proto_data *mg_http_create_proto_data(
struct mg_connection *c) {
/* If we have proto data from previous connection, flush it. */
if (c->proto_data != NULL) {
void *pd = c->proto_data;
c->proto_data = NULL;
mg_http_proto_data_destructor(pd);
}
c->proto_data = MG_CALLOC(1, sizeof(struct mg_http_proto_data));
c->proto_data_destructor = mg_http_proto_data_destructor;
return (struct mg_http_proto_data *) c->proto_data;
}
static struct mg_http_proto_data *mg_http_get_proto_data(
struct mg_connection *c) {
return (struct mg_http_proto_data *) c->proto_data;
}
#if MG_ENABLE_HTTP_STREAMING_MULTIPART
static void mg_http_free_proto_data_mp_stream(
struct mg_http_multipart_stream *mp) {
MG_FREE((void *) mp->boundary);
MG_FREE((void *) mp->var_name);
MG_FREE((void *) mp->file_name);
memset(mp, 0, sizeof(*mp));
}
#endif
#if MG_ENABLE_FILESYSTEM
static void mg_http_free_proto_data_file(struct mg_http_proto_data_file *d) {
if (d != NULL) {
if (d->fp != NULL) {
fclose(d->fp);
}
memset(d, 0, sizeof(struct mg_http_proto_data_file));
}
}
#endif
static void mg_http_free_proto_data_endpoints(struct mg_http_endpoint **ep) {
struct mg_http_endpoint *current = *ep;
while (current != NULL) {
struct mg_http_endpoint *tmp = current->next;
MG_FREE((void *) current->uri_pattern.p);
MG_FREE((void *) current->auth_domain);
MG_FREE((void *) current->auth_file);
MG_FREE(current);
current = tmp;
}
ep = NULL;
}
static void mg_http_free_reverse_proxy_data(struct mg_reverse_proxy_data *rpd) {
if (rpd->linked_conn != NULL) {
/*
* Connection has linked one, we have to unlink & close it
* since _this_ connection is going to die and
* it doesn't make sense to keep another one
*/
struct mg_http_proto_data *pd = mg_http_get_proto_data(rpd->linked_conn);
if (pd->reverse_proxy_data.linked_conn != NULL) {
pd->reverse_proxy_data.linked_conn->flags |= MG_F_SEND_AND_CLOSE;
pd->reverse_proxy_data.linked_conn = NULL;
}
rpd->linked_conn = NULL;
}
}
static void mg_http_proto_data_destructor(void *proto_data) {
struct mg_http_proto_data *pd = (struct mg_http_proto_data *) proto_data;
#if MG_ENABLE_FILESYSTEM
mg_http_free_proto_data_file(&pd->file);
#endif
#if MG_ENABLE_HTTP_CGI
mg_http_free_proto_data_cgi(&pd->cgi);
#endif
#if MG_ENABLE_HTTP_STREAMING_MULTIPART
mg_http_free_proto_data_mp_stream(&pd->mp_stream);
#endif
mg_http_free_proto_data_endpoints(&pd->endpoints);
mg_http_free_reverse_proxy_data(&pd->reverse_proxy_data);
MG_FREE(proto_data);
}
#if MG_ENABLE_FILESYSTEM
#define MIME_ENTRY(_ext, _type) \
{ _ext, sizeof(_ext) - 1, _type }
static const struct {
const char *extension;
size_t ext_len;
const char *mime_type;
} mg_static_builtin_mime_types[] = {
MIME_ENTRY("html", "text/html"),
MIME_ENTRY("html", "text/html"),
MIME_ENTRY("htm", "text/html"),
MIME_ENTRY("shtm", "text/html"),
MIME_ENTRY("shtml", "text/html"),
MIME_ENTRY("css", "text/css"),
MIME_ENTRY("js", "application/x-javascript"),
MIME_ENTRY("ico", "image/x-icon"),
MIME_ENTRY("gif", "image/gif"),
MIME_ENTRY("jpg", "image/jpeg"),
MIME_ENTRY("jpeg", "image/jpeg"),
MIME_ENTRY("png", "image/png"),
MIME_ENTRY("svg", "image/svg+xml"),
MIME_ENTRY("txt", "text/plain"),
MIME_ENTRY("torrent", "application/x-bittorrent"),
MIME_ENTRY("wav", "audio/x-wav"),
MIME_ENTRY("mp3", "audio/x-mp3"),
MIME_ENTRY("mid", "audio/mid"),
MIME_ENTRY("m3u", "audio/x-mpegurl"),
MIME_ENTRY("ogg", "application/ogg"),
MIME_ENTRY("ram", "audio/x-pn-realaudio"),
MIME_ENTRY("xml", "text/xml"),
MIME_ENTRY("ttf", "application/x-font-ttf"),
MIME_ENTRY("json", "application/json"),
MIME_ENTRY("xslt", "application/xml"),
MIME_ENTRY("xsl", "application/xml"),
MIME_ENTRY("ra", "audio/x-pn-realaudio"),
MIME_ENTRY("doc", "application/msword"),
MIME_ENTRY("exe", "application/octet-stream"),
MIME_ENTRY("zip", "application/x-zip-compressed"),
MIME_ENTRY("xls", "application/excel"),
MIME_ENTRY("tgz", "application/x-tar-gz"),
MIME_ENTRY("tar", "application/x-tar"),
MIME_ENTRY("gz", "application/x-gunzip"),
MIME_ENTRY("arj", "application/x-arj-compressed"),
MIME_ENTRY("rar", "application/x-rar-compressed"),
MIME_ENTRY("rtf", "application/rtf"),
MIME_ENTRY("pdf", "application/pdf"),
MIME_ENTRY("swf", "application/x-shockwave-flash"),
MIME_ENTRY("mpg", "video/mpeg"),
MIME_ENTRY("webm", "video/webm"),
MIME_ENTRY("mpeg", "video/mpeg"),
MIME_ENTRY("mov", "video/quicktime"),
MIME_ENTRY("mp4", "video/mp4"),
MIME_ENTRY("m4v", "video/x-m4v"),
MIME_ENTRY("asf", "video/x-ms-asf"),
MIME_ENTRY("avi", "video/x-msvideo"),
MIME_ENTRY("bmp", "image/bmp"),
{NULL, 0, NULL}};
static struct mg_str mg_get_mime_type(const char *path, const char *dflt,
const struct mg_serve_http_opts *opts) {
const char *ext, *overrides;
size_t i, path_len;
struct mg_str r, k, v;
path_len = strlen(path);
overrides = opts->custom_mime_types;
while ((overrides = mg_next_comma_list_entry(overrides, &k, &v)) != NULL) {
ext = path + (path_len - k.len);
if (path_len > k.len && mg_vcasecmp(&k, ext) == 0) {
return v;
}
}
for (i = 0; mg_static_builtin_mime_types[i].extension != NULL; i++) {
ext = path + (path_len - mg_static_builtin_mime_types[i].ext_len);
if (path_len > mg_static_builtin_mime_types[i].ext_len && ext[-1] == '.' &&
mg_casecmp(ext, mg_static_builtin_mime_types[i].extension) == 0) {
r.p = mg_static_builtin_mime_types[i].mime_type;
r.len = strlen(r.p);
return r;
}
}
r.p = dflt;
r.len = strlen(r.p);
return r;
}
#endif
/*
* Check whether full request is buffered. Return:
* -1 if request is malformed
* 0 if request is not yet fully buffered
* >0 actual request length, including last \r\n\r\n
*/
static int mg_http_get_request_len(const char *s, int buf_len) {
const unsigned char *buf = (unsigned char *) s;
int i;
for (i = 0; i < buf_len; i++) {
if (!isprint(buf[i]) && buf[i] != '\r' && buf[i] != '\n' && buf[i] < 128) {
return -1;
} else if (buf[i] == '\n' && i + 1 < buf_len && buf[i + 1] == '\n') {
return i + 2;
} else if (buf[i] == '\n' && i + 2 < buf_len && buf[i + 1] == '\r' &&
buf[i + 2] == '\n') {
return i + 3;
}
}
return 0;
}
static const char *mg_http_parse_headers(const char *s, const char *end,
int len, struct http_message *req) {
int i = 0;
while (i < (int) ARRAY_SIZE(req->header_names) - 1) {
struct mg_str *k = &req->header_names[i], *v = &req->header_values[i];
s = mg_skip(s, end, ": ", k);
s = mg_skip(s, end, "\r\n", v);
while (v->len > 0 && v->p[v->len - 1] == ' ') {
v->len--; /* Trim trailing spaces in header value */
}
/*
* If header value is empty - skip it and go to next (if any).
* NOTE: Do not add it to headers_values because such addition changes API
* behaviour
*/
if (k->len != 0 && v->len == 0) {
continue;
}
if (k->len == 0 || v->len == 0) {
k->p = v->p = NULL;
k->len = v->len = 0;
break;
}
if (!mg_ncasecmp(k->p, "Content-Length", 14)) {
req->body.len = (size_t) to64(v->p);
req->message.len = len + req->body.len;
}
i++;
}
return s;
}
int mg_parse_http(const char *s, int n, struct http_message *hm, int is_req) {
const char *end, *qs;
int len = mg_http_get_request_len(s, n);
if (len <= 0) return len;
memset(hm, 0, sizeof(*hm));
hm->message.p = s;
hm->body.p = s + len;
hm->message.len = hm->body.len = (size_t) ~0;
end = s + len;
/* Request is fully buffered. Skip leading whitespaces. */
while (s < end && isspace(*(unsigned char *) s)) s++;
if (is_req) {
/* Parse request line: method, URI, proto */
s = mg_skip(s, end, " ", &hm->method);
s = mg_skip(s, end, " ", &hm->uri);
s = mg_skip(s, end, "\r\n", &hm->proto);
if (hm->uri.p <= hm->method.p || hm->proto.p <= hm->uri.p) return -1;
/* If URI contains '?' character, initialize query_string */
if ((qs = (char *) memchr(hm->uri.p, '?', hm->uri.len)) != NULL) {
hm->query_string.p = qs + 1;
hm->query_string.len = &hm->uri.p[hm->uri.len] - (qs + 1);
hm->uri.len = qs - hm->uri.p;
}
} else {
s = mg_skip(s, end, " ", &hm->proto);
if (end - s < 4 || s[0] < '0' || s[0] > '9' || s[3] != ' ') return -1;
hm->resp_code = atoi(s);
if (hm->resp_code < 100 || hm->resp_code >= 600) return -1;
s += 4;
s = mg_skip(s, end, "\r\n", &hm->resp_status_msg);
}
s = mg_http_parse_headers(s, end, len, hm);
/*
* mg_parse_http() is used to parse both HTTP requests and HTTP
* responses. If HTTP response does not have Content-Length set, then
* body is read until socket is closed, i.e. body.len is infinite (~0).
*
* For HTTP requests though, according to
* http://tools.ietf.org/html/rfc7231#section-8.1.3,
* only POST and PUT methods have defined body semantics.
* Therefore, if Content-Length is not specified and methods are
* not one of PUT or POST, set body length to 0.
*
* So,
* if it is HTTP request, and Content-Length is not set,
* and method is not (PUT or POST) then reset body length to zero.
*/
if (hm->body.len == (size_t) ~0 && is_req &&
mg_vcasecmp(&hm->method, "PUT") != 0 &&
mg_vcasecmp(&hm->method, "POST") != 0) {
hm->body.len = 0;
hm->message.len = len;
}
return len;
}
struct mg_str *mg_get_http_header(struct http_message *hm, const char *name) {
size_t i, len = strlen(name);
for (i = 0; hm->header_names[i].len > 0; i++) {
struct mg_str *h = &hm->header_names[i], *v = &hm->header_values[i];
if (h->p != NULL && h->len == len && !mg_ncasecmp(h->p, name, len))
return v;
}
return NULL;
}
#if MG_ENABLE_FILESYSTEM
static void mg_http_transfer_file_data(struct mg_connection *nc) {
struct mg_http_proto_data *pd = mg_http_get_proto_data(nc);
char buf[MG_MAX_HTTP_SEND_MBUF];
size_t n = 0, to_read = 0, left = (size_t)(pd->file.cl - pd->file.sent);
if (pd->file.type == DATA_FILE) {
struct mbuf *io = &nc->send_mbuf;
if (io->len >= MG_MAX_HTTP_SEND_MBUF) {
to_read = 0;
} else {
to_read = MG_MAX_HTTP_SEND_MBUF - io->len;
}
if (to_read > left) {
to_read = left;
}
if (to_read > 0) {
n = mg_fread(buf, 1, to_read, pd->file.fp);
if (n > 0) {
mg_send(nc, buf, n);
pd->file.sent += n;
DBG(("%p sent %d (total %d)", nc, (int) n, (int) pd->file.sent));
}
} else {
/* Rate-limited */
}
if (pd->file.sent >= pd->file.cl) {
LOG(LL_DEBUG, ("%p done, %d bytes, ka %d", nc, (int) pd->file.sent,
pd->file.keepalive));
if (!pd->file.keepalive) nc->flags |= MG_F_SEND_AND_CLOSE;
mg_http_free_proto_data_file(&pd->file);
}
} else if (pd->file.type == DATA_PUT) {
struct mbuf *io = &nc->recv_mbuf;
size_t to_write = left <= 0 ? 0 : left < io->len ? (size_t) left : io->len;
size_t n = mg_fwrite(io->buf, 1, to_write, pd->file.fp);
if (n > 0) {
mbuf_remove(io, n);
pd->file.sent += n;
}
if (n == 0 || pd->file.sent >= pd->file.cl) {
if (!pd->file.keepalive) nc->flags |= MG_F_SEND_AND_CLOSE;
mg_http_free_proto_data_file(&pd->file);
}
}
#if MG_ENABLE_HTTP_CGI
else if (pd->cgi.cgi_nc != NULL) {
/* This is POST data that needs to be forwarded to the CGI process */
if (pd->cgi.cgi_nc != NULL) {
mg_forward(nc, pd->cgi.cgi_nc);
} else {
nc->flags |= MG_F_SEND_AND_CLOSE;
}
}
#endif
}
#endif /* MG_ENABLE_FILESYSTEM */
/*
* Parse chunked-encoded buffer. Return 0 if the buffer is not encoded, or
* if it's incomplete. If the chunk is fully buffered, return total number of
* bytes in a chunk, and store data in `data`, `data_len`.
*/
static size_t mg_http_parse_chunk(char *buf, size_t len, char **chunk_data,
size_t *chunk_len) {
unsigned char *s = (unsigned char *) buf;
size_t n = 0; /* scanned chunk length */
size_t i = 0; /* index in s */
/* Scan chunk length. That should be a hexadecimal number. */
while (i < len && isxdigit(s[i])) {
n *= 16;
n += (s[i] >= '0' && s[i] <= '9') ? s[i] - '0' : tolower(s[i]) - 'a' + 10;
i++;
if (i > 6) {
/* Chunk size is unreasonable. */
return 0;
}
}
/* Skip new line */
if (i == 0 || i + 2 > len || s[i] != '\r' || s[i + 1] != '\n') {
return 0;
}
i += 2;
/* Record where the data is */
*chunk_data = (char *) s + i;
*chunk_len = n;
/* Skip data */
i += n;
/* Skip new line */
if (i == 0 || i + 2 > len || s[i] != '\r' || s[i + 1] != '\n') {
return 0;
}
return i + 2;
}
MG_INTERNAL size_t mg_handle_chunked(struct mg_connection *nc,
struct http_message *hm, char *buf,
size_t blen) {
struct mg_http_proto_data *pd = mg_http_get_proto_data(nc);
char *data;
size_t i, n, data_len, body_len, zero_chunk_received = 0;
/* Find out piece of received data that is not yet reassembled */
body_len = (size_t) pd->chunk.body_len;
assert(blen >= body_len);
/* Traverse all fully buffered chunks */
for (i = body_len;
(n = mg_http_parse_chunk(buf + i, blen - i, &data, &data_len)) > 0;
i += n) {
/* Collapse chunk data to the rest of HTTP body */
memmove(buf + body_len, data, data_len);
body_len += data_len;
hm->body.len = body_len;
if (data_len == 0) {
zero_chunk_received = 1;
i += n;
break;
}
}
if (i > body_len) {
/* Shift unparsed content to the parsed body */
assert(i <= blen);
memmove(buf + body_len, buf + i, blen - i);
memset(buf + body_len + blen - i, 0, i - body_len);
nc->recv_mbuf.len -= i - body_len;
pd->chunk.body_len = body_len;
/* Send MG_EV_HTTP_CHUNK event */
nc->flags &= ~MG_F_DELETE_CHUNK;
mg_call(nc, nc->handler, nc->user_data, MG_EV_HTTP_CHUNK, hm);
/* Delete processed data if user set MG_F_DELETE_CHUNK flag */
if (nc->flags & MG_F_DELETE_CHUNK) {
memset(buf, 0, body_len);
memmove(buf, buf + body_len, blen - i);
nc->recv_mbuf.len -= body_len;
hm->body.len = 0;
pd->chunk.body_len = 0;
}
if (zero_chunk_received) {
/* Total message size is len(body) + len(headers) */
hm->message.len =
(size_t) pd->chunk.body_len + blen - i + (hm->body.p - hm->message.p);
}
}
return body_len;
}
struct mg_http_endpoint *mg_http_get_endpoint_handler(struct mg_connection *nc,
struct mg_str *uri_path) {
struct mg_http_proto_data *pd;
struct mg_http_endpoint *ret = NULL;
int matched, matched_max = 0;
struct mg_http_endpoint *ep;
if (nc == NULL) return NULL;
pd = mg_http_get_proto_data(nc);
if (pd == NULL) return NULL;
ep = pd->endpoints;
while (ep != NULL) {
if ((matched = mg_match_prefix_n(ep->uri_pattern, *uri_path)) > 0) {
if (matched > matched_max) {
/* Looking for the longest suitable handler */
ret = ep;
matched_max = matched;
}
}
ep = ep->next;
}
return ret;
}
#if MG_ENABLE_HTTP_STREAMING_MULTIPART
static void mg_http_multipart_continue(struct mg_connection *nc);
static void mg_http_multipart_begin(struct mg_connection *nc,
struct http_message *hm, int req_len);
#endif
static void mg_http_call_endpoint_handler(struct mg_connection *nc, int ev,
struct http_message *hm);
static void deliver_chunk(struct mg_connection *c, struct http_message *hm,
int req_len) {
/* Incomplete message received. Send MG_EV_HTTP_CHUNK event */
hm->body.len = c->recv_mbuf.len - req_len;
c->flags &= ~MG_F_DELETE_CHUNK;
mg_call(c, c->handler, c->user_data, MG_EV_HTTP_CHUNK, hm);
/* Delete processed data if user set MG_F_DELETE_CHUNK flag */
if (c->flags & MG_F_DELETE_CHUNK) c->recv_mbuf.len = req_len;
}
/*
* lx106 compiler has a bug (TODO(mkm) report and insert tracking bug here)
* If a big structure is declared in a big function, lx106 gcc will make it
* even bigger (round up to 4k, from 700 bytes of actual size).
*/
#ifdef __xtensa__
static void mg_http_handler2(struct mg_connection *nc, int ev,
void *ev_data MG_UD_ARG(void *user_data),
struct http_message *hm) __attribute__((noinline));
void mg_http_handler(struct mg_connection *nc, int ev,
void *ev_data MG_UD_ARG(void *user_data)) {
struct http_message hm;
mg_http_handler2(nc, ev, ev_data MG_UD_ARG(user_data), &hm);
}
static void mg_http_handler2(struct mg_connection *nc, int ev,
void *ev_data MG_UD_ARG(void *user_data),
struct http_message *hm) {
#else /* !__XTENSA__ */
void mg_http_handler(struct mg_connection *nc, int ev,
void *ev_data MG_UD_ARG(void *user_data)) {
struct http_message shm, *hm = &shm;
#endif /* __XTENSA__ */
struct mg_http_proto_data *pd = mg_http_get_proto_data(nc);
struct mbuf *io = &nc->recv_mbuf;
int req_len;
const int is_req = (nc->listener != NULL);
#if MG_ENABLE_HTTP_WEBSOCKET
struct mg_str *vec;
#endif
if (ev == MG_EV_CLOSE) {
#if MG_ENABLE_HTTP_CGI
/* Close associated CGI forwarder connection */
if (pd != NULL && pd->cgi.cgi_nc != NULL) {
pd->cgi.cgi_nc->user_data = NULL;
pd->cgi.cgi_nc->flags |= MG_F_CLOSE_IMMEDIATELY;
}
#endif
#if MG_ENABLE_HTTP_STREAMING_MULTIPART
if (pd != NULL && pd->mp_stream.boundary != NULL) {
/*
* Multipart message is in progress, but connection is closed.
* Finish part and request with an error flag.
*/
struct mg_http_multipart_part mp;
memset(&mp, 0, sizeof(mp));
mp.status = -1;
mp.user_data = pd->mp_stream.user_data;
mp.var_name = pd->mp_stream.var_name;
mp.file_name = pd->mp_stream.file_name;
mg_call(nc, (pd->endpoint_handler ? pd->endpoint_handler : nc->handler),
nc->user_data, MG_EV_HTTP_PART_END, &mp);
mp.var_name = NULL;
mp.file_name = NULL;
mg_call(nc, (pd->endpoint_handler ? pd->endpoint_handler : nc->handler),
nc->user_data, MG_EV_HTTP_MULTIPART_REQUEST_END, &mp);
} else
#endif
if (io->len > 0 &&
(req_len = mg_parse_http(io->buf, io->len, hm, is_req)) > 0) {
/*
* For HTTP messages without Content-Length, always send HTTP message
* before MG_EV_CLOSE message.
*/
int ev2 = is_req ? MG_EV_HTTP_REQUEST : MG_EV_HTTP_REPLY;
hm->message.len = io->len;
hm->body.len = io->buf + io->len - hm->body.p;
deliver_chunk(nc, hm, req_len);
mg_http_call_endpoint_handler(nc, ev2, hm);
}
if (pd != NULL && pd->endpoint_handler != NULL &&
pd->endpoint_handler != nc->handler) {
mg_call(nc, pd->endpoint_handler, nc->user_data, ev, NULL);
}
}
#if MG_ENABLE_FILESYSTEM
if (pd != NULL && pd->file.fp != NULL) {
mg_http_transfer_file_data(nc);
}
#endif
mg_call(nc, nc->handler, nc->user_data, ev, ev_data);
#if MG_ENABLE_HTTP_STREAMING_MULTIPART
if (pd != NULL && pd->mp_stream.boundary != NULL &&
(ev == MG_EV_RECV || ev == MG_EV_POLL)) {
if (ev == MG_EV_RECV) {
pd->rcvd += *(int *) ev_data;
mg_http_multipart_continue(nc);
} else if (pd->mp_stream.data_avail) {
/* Try re-delivering the data. */
mg_http_multipart_continue(nc);
}
return;
}
#endif /* MG_ENABLE_HTTP_STREAMING_MULTIPART */
if (ev == MG_EV_RECV) {
struct mg_str *s;
again:
req_len = mg_parse_http(io->buf, io->len, hm, is_req);
if (req_len > 0) {
/* New request - new proto data */
pd = mg_http_create_proto_data(nc);
pd->rcvd = io->len;
}
if (req_len > 0 &&
(s = mg_get_http_header(hm, "Transfer-Encoding")) != NULL &&
mg_vcasecmp(s, "chunked") == 0) {
mg_handle_chunked(nc, hm, io->buf + req_len, io->len - req_len);
}
#if MG_ENABLE_HTTP_STREAMING_MULTIPART
if (req_len > 0 && (s = mg_get_http_header(hm, "Content-Type")) != NULL &&
s->len >= 9 && strncmp(s->p, "multipart", 9) == 0) {
mg_http_multipart_begin(nc, hm, req_len);
mg_http_multipart_continue(nc);
return;
}
#endif /* MG_ENABLE_HTTP_STREAMING_MULTIPART */
/* TODO(alashkin): refactor this ifelseifelseifelseifelse */
if ((req_len < 0 ||
(req_len == 0 && io->len >= MG_MAX_HTTP_REQUEST_SIZE))) {
DBG(("invalid request"));
nc->flags |= MG_F_CLOSE_IMMEDIATELY;
} else if (req_len == 0) {
/* Do nothing, request is not yet fully buffered */
}
#if MG_ENABLE_HTTP_WEBSOCKET
else if (nc->listener == NULL && (nc->flags & MG_F_IS_WEBSOCKET)) {
/* We're websocket client, got handshake response from server. */
DBG(("%p WebSocket upgrade code %d", nc, hm->resp_code));
if (hm->resp_code == 101 &&
mg_get_http_header(hm, "Sec-WebSocket-Accept")) {
/* TODO(lsm): check the validity of accept Sec-WebSocket-Accept */
mg_call(nc, nc->handler, nc->user_data, MG_EV_WEBSOCKET_HANDSHAKE_DONE,
hm);
mbuf_remove(io, req_len);
nc->proto_handler = mg_ws_handler;
mg_ws_handler(nc, MG_EV_RECV, ev_data MG_UD_ARG(user_data));
} else {
mg_call(nc, nc->handler, nc->user_data, MG_EV_WEBSOCKET_HANDSHAKE_DONE,
hm);
nc->flags |= MG_F_CLOSE_IMMEDIATELY;
mbuf_remove(io, req_len);
}
} else if (nc->listener != NULL &&
(vec = mg_get_http_header(hm, "Sec-WebSocket-Key")) != NULL) {
struct mg_http_endpoint *ep;
/* This is a websocket request. Switch protocol handlers. */
mbuf_remove(io, req_len);
nc->proto_handler = mg_ws_handler;
nc->flags |= MG_F_IS_WEBSOCKET;
/*
* If we have a handler set up with mg_register_http_endpoint(),
* deliver subsequent websocket events to this handler after the
* protocol switch.
*/
ep = mg_http_get_endpoint_handler(nc->listener, &hm->uri);
if (ep != NULL) {
nc->handler = ep->handler;
#if MG_ENABLE_CALLBACK_USERDATA
nc->user_data = ep->user_data;
#endif
}
/* Send handshake */
mg_call(nc, nc->handler, nc->user_data, MG_EV_WEBSOCKET_HANDSHAKE_REQUEST,
hm);
if (!(nc->flags & (MG_F_CLOSE_IMMEDIATELY | MG_F_SEND_AND_CLOSE))) {
if (nc->send_mbuf.len == 0) {
mg_ws_handshake(nc, vec, hm);
}
mg_call(nc, nc->handler, nc->user_data, MG_EV_WEBSOCKET_HANDSHAKE_DONE,
hm);
mg_ws_handler(nc, MG_EV_RECV, ev_data MG_UD_ARG(user_data));
}
}
#endif /* MG_ENABLE_HTTP_WEBSOCKET */
else if (hm->message.len > pd->rcvd) {
/* Not yet received all HTTP body, deliver MG_EV_HTTP_CHUNK */
deliver_chunk(nc, hm, req_len);
if (nc->recv_mbuf_limit > 0 && nc->recv_mbuf.len >= nc->recv_mbuf_limit) {
LOG(LL_ERROR, ("%p recv buffer (%lu bytes) exceeds the limit "
"%lu bytes, and not drained, closing",
nc, (unsigned long) nc->recv_mbuf.len,
(unsigned long) nc->recv_mbuf_limit));
nc->flags |= MG_F_CLOSE_IMMEDIATELY;
}
} else {
/* We did receive all HTTP body. */
int request_done = 1;
int trigger_ev = nc->listener ? MG_EV_HTTP_REQUEST : MG_EV_HTTP_REPLY;
char addr[32];
mg_sock_addr_to_str(&nc->sa, addr, sizeof(addr),
MG_SOCK_STRINGIFY_IP | MG_SOCK_STRINGIFY_PORT);
DBG(("%p %s %.*s %.*s", nc, addr, (int) hm->method.len, hm->method.p,
(int) hm->uri.len, hm->uri.p));
deliver_chunk(nc, hm, req_len);
/* Whole HTTP message is fully buffered, call event handler */
mg_http_call_endpoint_handler(nc, trigger_ev, hm);
mbuf_remove(io, hm->message.len);
pd->rcvd -= hm->message.len;
#if MG_ENABLE_FILESYSTEM
/* We don't have a generic mechanism of communicating that we are done
* responding to a request (should probably add one). But if we are
* serving
* a file, we are definitely not done. */
if (pd->file.fp != NULL) request_done = 0;
#endif
#if MG_ENABLE_HTTP_CGI
/* If this is a CGI request, we are not done either. */
if (pd->cgi.cgi_nc != NULL) request_done = 0;
#endif
if (request_done && io->len > 0) goto again;
}
}
}
static size_t mg_get_line_len(const char *buf, size_t buf_len) {
size_t len = 0;
while (len < buf_len && buf[len] != '\n') len++;
return len == buf_len ? 0 : len + 1;
}
#if MG_ENABLE_HTTP_STREAMING_MULTIPART
static void mg_http_multipart_begin(struct mg_connection *nc,
struct http_message *hm, int req_len) {
struct mg_http_proto_data *pd = mg_http_get_proto_data(nc);
struct mg_str *ct;
struct mbuf *io = &nc->recv_mbuf;
char boundary_buf[100];
char *boundary = boundary_buf;
int boundary_len;
ct = mg_get_http_header(hm, "Content-Type");
if (ct == NULL) {
/* We need more data - or it isn't multipart mesage */
goto exit_mp;
}
/* Content-type should start with "multipart" */
if (ct->len < 9 || strncmp(ct->p, "multipart", 9) != 0) {
goto exit_mp;
}
boundary_len =
mg_http_parse_header2(ct, "boundary", &boundary, sizeof(boundary_buf));
if (boundary_len == 0) {
/*
* Content type is multipart, but there is no boundary,
* probably malformed request
*/
nc->flags = MG_F_CLOSE_IMMEDIATELY;
DBG(("invalid request"));
goto exit_mp;
}
/* If we reach this place - that is multipart request */
if (pd->mp_stream.boundary != NULL) {
/*
* Another streaming request was in progress,
* looks like protocol error
*/
nc->flags |= MG_F_CLOSE_IMMEDIATELY;
} else {
struct mg_http_endpoint *ep = NULL;
pd->mp_stream.state = MPS_BEGIN;
pd->mp_stream.boundary = strdup(boundary);
pd->mp_stream.boundary_len = strlen(boundary);
pd->mp_stream.var_name = pd->mp_stream.file_name = NULL;
pd->endpoint_handler = nc->handler;
ep = mg_http_get_endpoint_handler(nc->listener, &hm->uri);
if (ep != NULL) {
pd->endpoint_handler = ep->handler;
}
mg_http_call_endpoint_handler(nc, MG_EV_HTTP_MULTIPART_REQUEST, hm);