+++ /dev/null
-#include "tunala.h"
-
-#ifndef NO_BUFFER
-
-void buffer_init(buffer_t *buf)
-{
- buf->used = 0;
- buf->total_in = buf->total_out = 0;
-}
-
-void buffer_close(buffer_t *buf)
-{
- /* Our data is static - nothing needs "release", just reset it */
- buf->used = 0;
-}
-
-/* Code these simple ones in compact form */
-unsigned int buffer_used(buffer_t *buf) {
- return buf->used; }
-unsigned int buffer_unused(buffer_t *buf) {
- return (MAX_DATA_SIZE - buf->used); }
-int buffer_full(buffer_t *buf) {
- return (buf->used == MAX_DATA_SIZE ? 1 : 0); }
-int buffer_notfull(buffer_t *buf) {
- return (buf->used < MAX_DATA_SIZE ? 1 : 0); }
-int buffer_empty(buffer_t *buf) {
- return (buf->used == 0 ? 1 : 0); }
-int buffer_notempty(buffer_t *buf) {
- return (buf->used > 0 ? 1 : 0); }
-unsigned long buffer_total_in(buffer_t *buf) {
- return buf->total_in; }
-unsigned long buffer_total_out(buffer_t *buf) {
- return buf->total_out; }
-
-/* These 3 static (internal) functions don't adjust the "total" variables as
- * it's not sure when they're called how it should be interpreted. Only the
- * higher-level "buffer_[to|from]_[fd|SSL|BIO]" functions should alter these
- * values. */
-#if 0 /* To avoid "unused" warnings */
-static unsigned int buffer_adddata(buffer_t *buf, const unsigned char *ptr,
- unsigned int size)
-{
- unsigned int added = MAX_DATA_SIZE - buf->used;
- if(added > size)
- added = size;
- if(added == 0)
- return 0;
- memcpy(buf->data + buf->used, ptr, added);
- buf->used += added;
- buf->total_in += added;
- return added;
-}
-
-static unsigned int buffer_tobuffer(buffer_t *to, buffer_t *from, int cap)
-{
- unsigned int moved, tomove = from->used;
- if((int)tomove > cap)
- tomove = cap;
- if(tomove == 0)
- return 0;
- moved = buffer_adddata(to, from->data, tomove);
- if(moved == 0)
- return 0;
- buffer_takedata(from, NULL, moved);
- return moved;
-}
-#endif
-
-static unsigned int buffer_takedata(buffer_t *buf, unsigned char *ptr,
- unsigned int size)
-{
- unsigned int taken = buf->used;
- if(taken > size)
- taken = size;
- if(taken == 0)
- return 0;
- if(ptr)
- memcpy(ptr, buf->data, taken);
- buf->used -= taken;
- /* Do we have to scroll? */
- if(buf->used > 0)
- memmove(buf->data, buf->data + taken, buf->used);
- return taken;
-}
-
-#ifndef NO_IP
-
-int buffer_from_fd(buffer_t *buf, int fd)
-{
- int toread = buffer_unused(buf);
- if(toread == 0)
- /* Shouldn't be called in this case! */
- abort();
- toread = read(fd, buf->data + buf->used, toread);
- if(toread > 0) {
- buf->used += toread;
- buf->total_in += toread;
- }
- return toread;
-}
-
-int buffer_to_fd(buffer_t *buf, int fd)
-{
- int towrite = buffer_used(buf);
- if(towrite == 0)
- /* Shouldn't be called in this case! */
- abort();
- towrite = write(fd, buf->data, towrite);
- if(towrite > 0) {
- buffer_takedata(buf, NULL, towrite);
- buf->total_out += towrite;
- }
- return towrite;
-}
-
-#endif /* !defined(NO_IP) */
-
-#ifndef NO_OPENSSL
-
-static void int_ssl_check(SSL *s, int ret)
-{
- int e = SSL_get_error(s, ret);
- switch(e) {
- /* These seem to be harmless and already "dealt with" by our
- * non-blocking environment. NB: "ZERO_RETURN" is the clean
- * "error" indicating a successfully closed SSL tunnel. We let
- * this happen because our IO loop should not appear to have
- * broken on this condition - and outside the IO loop, the
- * "shutdown" state is checked. */
- case SSL_ERROR_NONE:
- case SSL_ERROR_WANT_READ:
- case SSL_ERROR_WANT_WRITE:
- case SSL_ERROR_WANT_X509_LOOKUP:
- case SSL_ERROR_ZERO_RETURN:
- return;
- /* These seem to be indications of a genuine error that should
- * result in the SSL tunnel being regarded as "dead". */
- case SSL_ERROR_SYSCALL:
- case SSL_ERROR_SSL:
- SSL_set_app_data(s, (char *)1);
- return;
- default:
- break;
- }
- /* For any other errors that (a) exist, and (b) crop up - we need to
- * interpret what to do with them - so "politely inform" the caller that
- * the code needs updating here. */
- abort();
-}
-
-void buffer_from_SSL(buffer_t *buf, SSL *ssl)
-{
- int ret;
- if(!ssl || buffer_full(buf))
- return;
- ret = SSL_read(ssl, buf->data + buf->used, buffer_unused(buf));
- if(ret > 0) {
- buf->used += ret;
- buf->total_in += ret;
- }
- if(ret < 0)
- int_ssl_check(ssl, ret);
-}
-
-void buffer_to_SSL(buffer_t *buf, SSL *ssl)
-{
- int ret;
- if(!ssl || buffer_empty(buf))
- return;
- ret = SSL_write(ssl, buf->data, buf->used);
- if(ret > 0) {
- buffer_takedata(buf, NULL, ret);
- buf->total_out += ret;
- }
- if(ret < 0)
- int_ssl_check(ssl, ret);
-}
-
-void buffer_from_BIO(buffer_t *buf, BIO *bio)
-{
- int ret;
- if(!bio || buffer_full(buf))
- return;
- ret = BIO_read(bio, buf->data + buf->used, buffer_unused(buf));
- if(ret > 0) {
- buf->used += ret;
- buf->total_in += ret;
- }
-}
-
-void buffer_to_BIO(buffer_t *buf, BIO *bio)
-{
- int ret;
- if(!bio || buffer_empty(buf))
- return;
- ret = BIO_write(bio, buf->data, buf->used);
- if(ret > 0) {
- buffer_takedata(buf, NULL, ret);
- buf->total_out += ret;
- }
-}
-
-#endif /* !defined(NO_OPENSSL) */
-
-#endif /* !defined(NO_BUFFER) */
projects / cassiopeia.git / blobdiff