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/* libotr headers */
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#include "context.h"
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/* Strings describing the connection states */
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const char *otrl_context_statestr[] =
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{ "Not private", "Setting up", "Private" };
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/* Create a new connection context. */
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static ConnContext * new_context(const char * user, const char * accountname,
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const char * protocol)
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context->username = strdup(user);
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context->accountname = strdup(accountname);
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context->protocol = strdup(protocol);
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context->state = CONN_UNCONNECTED;
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context->fragment = NULL;
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context->fragment_len = 0;
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context->fragment_n = 0;
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context->fragment_k = 0;
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context->msgstate = OTRL_MSGSTATE_PLAINTEXT;
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otrl_auth_new(&(context->auth));
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context->fingerprint_root.fingerprint = NULL;
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context->fingerprint_root.context = context;
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context->fingerprint_root.next = NULL;
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otrl_dh_session_blank(&(context->sesskeys[0][1]));
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otrl_dh_session_blank(&(context->sesskeys[1][0]));
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otrl_dh_session_blank(&(context->sesskeys[1][1]));
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memset(context->sessionid, 0, 20);
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context->sessionid_len = 0;
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context->protocol_version = 0;
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context->numsavedkeys = 0;
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context->preshared_secret = NULL;
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context->preshared_secret_len = 0;
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context->saved_mac_keys = NULL;
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context->generation = 0;
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context->lastsent = 0;
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/* Force a context into the CONN_SETUP state (so that it only has local
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void otrl_context_force_setup(ConnContext *context)
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context->state = CONN_SETUP;
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/* Set the trust level for a given fingerprint */
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void otrl_context_set_trust(Fingerprint *fprint, const char *trust)
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if (fprint == NULL) return;
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fprint->trust = trust ? strdup(trust) : NULL;
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/* Set the preshared secret for a given fingerprint. Note that this
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* currently only stores the secret in the ConnContext structure, but
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* doesn't yet do anything with it. */
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void otrl_context_set_preshared_secret(ConnContext *context,
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const unsigned char *secret, size_t secret_len)
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free(context->preshared_secret);
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context->preshared_secret = NULL;
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context->preshared_secret_len = 0;
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context->preshared_secret = malloc(secret_len);
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if (context->preshared_secret) {
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memmove(context->preshared_secret, secret, secret_len);
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context->preshared_secret_len = secret_len;
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/* Force a context into the OTRL_MSGSTATE_FINISHED state. */
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void otrl_context_force_finished(ConnContext *context)
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context->msgstate = OTRL_MSGSTATE_FINISHED;
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otrl_auth_clear(&(context->auth));
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free(context->fragment);
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context->fragment = NULL;
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context->fragment_len = 0;
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context->fragment_n = 0;
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context->fragment_k = 0;
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context->active_fingerprint = NULL;
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context->their_keyid = 0;
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gcry_mpi_release(context->their_y);
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context->their_y = NULL;
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gcry_mpi_release(context->their_old_y);
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context->their_old_y = NULL;
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context->our_keyid = 0;
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otrl_dh_keypair_free(&(context->our_dh_key));
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otrl_dh_keypair_free(&(context->our_old_dh_key));
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otrl_dh_session_free(&(context->sesskeys[0][0]));
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otrl_dh_session_free(&(context->sesskeys[0][1]));
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otrl_dh_session_free(&(context->sesskeys[1][0]));
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otrl_dh_session_free(&(context->sesskeys[1][1]));
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memset(context->sessionid, 0, 20);
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context->sessionid_len = 0;
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free(context->preshared_secret);
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context->preshared_secret = NULL;
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context->preshared_secret_len = 0;
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context->protocol_version = 0;
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context->numsavedkeys = 0;
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free(context->saved_mac_keys);
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context->saved_mac_keys = NULL;
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context->may_retransmit = 0;
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/* Force a context into the CONN_UNCONNECTED state. */
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void otrl_context_force_disconnect(ConnContext *context)
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/* Force a context into the OTRL_MSGSTATE_PLAINTEXT state. */
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void otrl_context_force_plaintext(ConnContext *context)
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/* First clean up everything we'd need to do for the SETUP state */
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otrl_context_force_setup(context);
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/* First clean up everything we'd need to do for the FINISHED state */
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otrl_context_force_finished(context);
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/* Now clean up our pubkeys, too */
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context->state = CONN_UNCONNECTED;
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context->our_keyid = 0;
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otrl_dh_keypair_free(&(context->our_dh_key));
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otrl_dh_keypair_free(&(context->our_old_dh_key));
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/* And just set the state properly */
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context->msgstate = OTRL_MSGSTATE_PLAINTEXT;
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/* Forget a fingerprint (so long as it's not the active one. If it's a
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* fingerprint_root, forget the whole context (as long as
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* and_maybe_context is set, and it's UNCONNECTED). Also, if it's not
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* and_maybe_context is set, and it's PLAINTEXT). Also, if it's not
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* the fingerprint_root, but it's the only fingerprint, and we're
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* UNCONNECTED, forget the whole context if and_maybe_context is set. */
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* PLAINTEXT, forget the whole context if and_maybe_context is set. */
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void otrl_context_forget_fingerprint(Fingerprint *fprint,
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int and_maybe_context)
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ConnContext *context = fprint->context;
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if (fprint == &(context->fingerprint_root)) {
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if (context->state == CONN_UNCONNECTED && and_maybe_context) {
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if (context->msgstate == OTRL_MSGSTATE_PLAINTEXT &&
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otrl_context_forget(context);
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if (context->state != CONN_CONNECTED ||
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if (context->msgstate != OTRL_MSGSTATE_PLAINTEXT ||
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context->active_fingerprint != fprint) {
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free(fprint->fingerprint);
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*(fprint->tous) = fprint->next;
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if (fprint->next) {
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fprint->next->tous = fprint->tous;
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if (context->state == CONN_UNCONNECTED &&
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if (context->msgstate == OTRL_MSGSTATE_PLAINTEXT &&
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context->fingerprint_root.next == NULL &&
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and_maybe_context) {
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/* We just deleted the only fingerprint. Forget the
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/* Forget a whole context, so long as it's UNCONNECTED. */
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/* Forget a whole context, so long as it's PLAINTEXT. */
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void otrl_context_forget(ConnContext *context)
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if (context->state != CONN_UNCONNECTED) return;
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if (context->msgstate != OTRL_MSGSTATE_PLAINTEXT) return;
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/* Just to be safe, force a disconnect. This also frees any
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/* Just to be safe, force to plaintext. This also frees any
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* extraneous data lying around. */
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otrl_context_force_disconnect(context);
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otrl_context_force_plaintext(context);
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/* First free all the Fingerprints */
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while(context->fingerprint_root.next) {
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/* Forget all the contexts in a given OtrlUserState, forcing them to
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/* Forget all the contexts in a given OtrlUserState. */
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void otrl_context_forget_all(OtrlUserState us)
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while (us->context_root) {
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otrl_context_force_disconnect(us->context_root);
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otrl_context_force_plaintext(us->context_root);
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otrl_context_forget(us->context_root);
added
removed
src/context.c
