#include <stdint.h>
#include "gnunet_protocols.h"
-#include "gnunet_server_lib.h"
#include "plugin_transport_wlan.h"
#define ARPHRD_IEEE80211 801
};
+
+/* specialized version of server_mst.c begins here */
+
+#define ALIGN_FACTOR 8
+
+/**
+ * Smallest supported message.
+ */
+#define GNUNET_SERVER_MIN_BUFFER_SIZE sizeof (struct GNUNET_MessageHeader)
+
+
+/**
+ * Functions with this signature are called whenever a
+ * complete message is received by the tokenizer.
+ *
+ * @param cls closure
+ * @param client identification of the client
+ * @param message the actual message
+ */
+typedef void (*GNUNET_SERVER_MessageTokenizerCallback) (void *cls, void *client,
+ const struct
+ GNUNET_MessageHeader *
+ message);
+
+/**
+ * Handle to a message stream tokenizer.
+ */
+struct GNUNET_SERVER_MessageStreamTokenizer
+{
+
+ /**
+ * Function to call on completed messages.
+ */
+ GNUNET_SERVER_MessageTokenizerCallback cb;
+
+ /**
+ * Closure for cb.
+ */
+ void *cb_cls;
+
+ /**
+ * Size of the buffer (starting at 'hdr').
+ */
+ size_t curr_buf;
+
+ /**
+ * How many bytes in buffer have we already processed?
+ */
+ size_t off;
+
+ /**
+ * How many bytes in buffer are valid right now?
+ */
+ size_t pos;
+
+ /**
+ * Beginning of the buffer. Typed like this to force alignment.
+ */
+ struct GNUNET_MessageHeader *hdr;
+
+};
+
+
+
+/**
+ * Create a message stream tokenizer.
+ *
+ * @param cb function to call on completed messages
+ * @param cb_cls closure for cb
+ * @return handle to tokenizer
+ */
+struct GNUNET_SERVER_MessageStreamTokenizer *
+GNUNET_SERVER_mst_create (GNUNET_SERVER_MessageTokenizerCallback cb,
+ void *cb_cls)
+{
+ struct GNUNET_SERVER_MessageStreamTokenizer *ret;
+
+ ret = malloc (sizeof (struct GNUNET_SERVER_MessageStreamTokenizer));
+ if (NULL == ret)
+ exit (1);
+ ret->hdr = malloc (GNUNET_SERVER_MIN_BUFFER_SIZE);
+ if (NULL == ret->hdr)
+ exit (2);
+ ret->curr_buf = GNUNET_SERVER_MIN_BUFFER_SIZE;
+ ret->cb = cb;
+ ret->cb_cls = cb_cls;
+ return ret;
+}
+
+
+#define GNUNET_MIN(a,b) (((a) < (b)) ? (a) : (b))
+
+/**
+ * Named constants for return values. The following
+ * invariants hold: "GNUNET_NO == 0" (to allow "if (GNUNET_NO)")
+ * "GNUNET_OK != GNUNET_SYSERR", "GNUNET_OK != GNUNET_NO", "GNUNET_NO != GNUNET_SYSERR"
+ * and finally "GNUNET_YES != GNUNET_NO".
+ */
+#define GNUNET_OK 1
+#define GNUNET_SYSERR -1
+#define GNUNET_YES 1
+#define GNUNET_NO 0
+
+
+/**
+ * Add incoming data to the receive buffer and call the
+ * callback for all complete messages.
+ *
+ * @param mst tokenizer to use
+ * @param client_identity ID of client for which this is a buffer
+ * @param buf input data to add
+ * @param size number of bytes in buf
+ * @param purge should any excess bytes in the buffer be discarded
+ * (i.e. for packet-based services like UDP)
+ * @param one_shot only call callback once, keep rest of message in buffer
+ * @return GNUNET_OK if we are done processing (need more data)
+ * GNUNET_NO if one_shot was set and we have another message ready
+ * GNUNET_SYSERR if the data stream is corrupt
+ */
+int
+GNUNET_SERVER_mst_receive (struct GNUNET_SERVER_MessageStreamTokenizer *mst,
+ void *client_identity, const char *buf, size_t size,
+ int purge, int one_shot)
+{
+ const struct GNUNET_MessageHeader *hdr;
+ size_t delta;
+ uint16_t want;
+ char *ibuf;
+ int need_align;
+ unsigned long offset;
+ int ret;
+
+ ret = GNUNET_OK;
+ ibuf = (char *) mst->hdr;
+ while (mst->pos > 0)
+ {
+do_align:
+ if ((mst->curr_buf - mst->off < sizeof (struct GNUNET_MessageHeader)) ||
+ (0 != (mst->off % ALIGN_FACTOR)))
+ {
+ /* need to align or need more space */
+ mst->pos -= mst->off;
+ memmove (ibuf, &ibuf[mst->off], mst->pos);
+ mst->off = 0;
+ }
+ if (mst->pos - mst->off < sizeof (struct GNUNET_MessageHeader))
+ {
+ delta =
+ GNUNET_MIN (sizeof (struct GNUNET_MessageHeader) -
+ (mst->pos - mst->off), size);
+ memcpy (&ibuf[mst->pos], buf, delta);
+ mst->pos += delta;
+ buf += delta;
+ size -= delta;
+ }
+ if (mst->pos - mst->off < sizeof (struct GNUNET_MessageHeader))
+ {
+ if (purge)
+ {
+ mst->off = 0;
+ mst->pos = 0;
+ }
+ return GNUNET_OK;
+ }
+ hdr = (const struct GNUNET_MessageHeader *) &ibuf[mst->off];
+ want = ntohs (hdr->size);
+ if (want < sizeof (struct GNUNET_MessageHeader))
+ {
+ // GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ if (mst->curr_buf - mst->off < want)
+ {
+ /* need more space */
+ mst->pos -= mst->off;
+ memmove (ibuf, &ibuf[mst->off], mst->pos);
+ mst->off = 0;
+ }
+ if (want > mst->curr_buf)
+ {
+ mst->hdr = realloc (mst->hdr, want);
+ if (NULL == mst->hdr)
+ exit (3);
+ ibuf = (char *) mst->hdr;
+ mst->curr_buf = want;
+ }
+ hdr = (const struct GNUNET_MessageHeader *) &ibuf[mst->off];
+ if (mst->pos - mst->off < want)
+ {
+ delta = GNUNET_MIN (want - (mst->pos - mst->off), size);
+ memcpy (&ibuf[mst->pos], buf, delta);
+ mst->pos += delta;
+ buf += delta;
+ size -= delta;
+ }
+ if (mst->pos - mst->off < want)
+ {
+ if (purge)
+ {
+ mst->off = 0;
+ mst->pos = 0;
+ }
+ return GNUNET_OK;
+ }
+ if (one_shot == GNUNET_SYSERR)
+ {
+ /* cannot call callback again, but return value saying that
+ * we have another full message in the buffer */
+ ret = GNUNET_NO;
+ goto copy;
+ }
+ if (one_shot == GNUNET_YES)
+ one_shot = GNUNET_SYSERR;
+ mst->cb (mst->cb_cls, client_identity, hdr);
+ mst->off += want;
+ if (mst->off == mst->pos)
+ {
+ /* reset to beginning of buffer, it's free right now! */
+ mst->off = 0;
+ mst->pos = 0;
+ }
+ }
+ while (size > 0)
+ {
+ if (size < sizeof (struct GNUNET_MessageHeader))
+ break;
+ offset = (unsigned long) buf;
+ need_align = (0 != offset % ALIGN_FACTOR) ? GNUNET_YES : GNUNET_NO;
+ if (GNUNET_NO == need_align)
+ {
+ /* can try to do zero-copy and process directly from original buffer */
+ hdr = (const struct GNUNET_MessageHeader *) buf;
+ want = ntohs (hdr->size);
+ if (want < sizeof (struct GNUNET_MessageHeader))
+ {
+ // GNUNET_break_op (0);
+ mst->off = 0;
+ return GNUNET_SYSERR;
+ }
+ if (size < want)
+ break; /* or not, buffer incomplete, so copy to private buffer... */
+ if (one_shot == GNUNET_SYSERR)
+ {
+ /* cannot call callback again, but return value saying that
+ * we have another full message in the buffer */
+ ret = GNUNET_NO;
+ goto copy;
+ }
+ if (one_shot == GNUNET_YES)
+ one_shot = GNUNET_SYSERR;
+ mst->cb (mst->cb_cls, client_identity, hdr);
+ buf += want;
+ size -= want;
+ }
+ else
+ {
+ /* need to copy to private buffer to align;
+ * yes, we go a bit more spagetti than usual here */
+ goto do_align;
+ }
+ }
+copy:
+ if ((size > 0) && (!purge))
+ {
+ if (size + mst->pos > mst->curr_buf)
+ {
+ mst->hdr = realloc (mst->hdr, size + mst->pos);
+ if (NULL == mst->hdr)
+ exit (4);
+ ibuf = (char *) mst->hdr;
+ mst->curr_buf = size + mst->pos;
+ }
+ // GNUNET_assert (mst->pos + size <= mst->curr_buf);
+ memcpy (&ibuf[mst->pos], buf, size);
+ mst->pos += size;
+ }
+ if (purge)
+ mst->off = 0;
+ return ret;
+}
+
+
+/**
+ * Destroys a tokenizer.
+ *
+ * @param mst tokenizer to destroy
+ */
+void
+GNUNET_SERVER_mst_destroy (struct GNUNET_SERVER_MessageStreamTokenizer *mst)
+{
+ free (mst->hdr);
+ free (mst);
+}
+
+/* end of server_mst.c copy */
+
+
+
+
/**
* Radiotap header iteration
*
dev.write_pout.size = 0;
dev.write_pout.pos = 0;
- stdin_mst = GNUNET_SERVER_mst_create (&stdin_send_hw, &dev);
+ stdin_mst = GNUNET_SERVER_mst_create (&stdin_send_hw, &dev);
/* send mac to STDOUT first */
write_std.pos = 0;
projects / oweals / gnunet.git / commitdiff