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Diffstat (limited to 'src/or/command.c')
| -rw-r--r-- | src/or/command.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/src/or/command.c b/src/or/command.c index 5ad92bed1e..5866c386e4 100644 --- a/src/or/command.c +++ b/src/or/command.c @@ -7,6 +7,26 @@ /** * \file command.c * \brief Functions for processing incoming cells. + * + * When we receive a cell from a client or a relay, it arrives on some + * channel, and tells us what to do with it. In this module, we dispatch based + * on the cell type using the functions command_process_cell() and + * command_process_var_cell(), and deal with the cell accordingly. (These + * handlers are installed on a channel with the command_setup_channel() + * function.) + * + * Channels have a chance to handle some cell types on their own before they + * are ever passed here --- typically, they do this for cells that are + * specific to a given channel type. For example, in channeltls.c, the cells + * for the initial connection handshake are handled before we get here. (Of + * course, the fact that there _is_ only one channel type for now means that + * we may have gotten the factoring wrong here.) + * + * Handling other cell types is mainly farmed off to other modules, after + * initial sanity-checking. CREATE* cells are handled ultimately in onion.c, + * CREATED* cells trigger circuit creation in circuitbuild.c, DESTROY cells + * are handled here (since they're simple), and RELAY cells, in all their + * complexity, are passed off to relay.c. **/ /* In-points to command.c: |