131 lines
3.3 KiB
C
131 lines
3.3 KiB
C
#include <ccan/read_write_all/read_write_all.h>
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#include <common/crypto_sync.h>
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#include <common/cryptomsg.h>
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#include <common/dev_disconnect.h>
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#include <common/peer_failed.h>
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#include <common/per_peer_state.h>
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#include <common/status.h>
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#include <common/utils.h>
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#include <errno.h>
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#include <inttypes.h>
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#include <netinet/in.h>
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#include <netinet/tcp.h>
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#include <sys/socket.h>
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#include <wire/wire.h>
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#include <wire/wire_sync.h>
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void sync_crypto_write(struct per_peer_state *pps, const void *msg TAKES)
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{
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#if DEVELOPER
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bool post_sabotage = false;
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int type = fromwire_peektype(msg);
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#endif
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u8 *enc;
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status_peer_io(LOG_IO_OUT, msg);
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enc = cryptomsg_encrypt_msg(NULL, &pps->cs, msg);
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#if DEVELOPER
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switch (dev_disconnect(type)) {
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case DEV_DISCONNECT_BEFORE:
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dev_sabotage_fd(pps->peer_fd);
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peer_failed_connection_lost();
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case DEV_DISCONNECT_DROPPKT:
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enc = tal_free(enc); /* FALL THRU */
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case DEV_DISCONNECT_AFTER:
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post_sabotage = true;
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break;
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case DEV_DISCONNECT_BLACKHOLE:
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dev_blackhole_fd(pps->peer_fd);
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break;
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case DEV_DISCONNECT_NORMAL:
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break;
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}
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#endif
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if (!write_all(pps->peer_fd, enc, tal_count(enc)))
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peer_failed_connection_lost();
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tal_free(enc);
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#if DEVELOPER
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if (post_sabotage)
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dev_sabotage_fd(pps->peer_fd);
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#endif
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}
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/* We're happy for the kernel to batch update and gossip messages, but a
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* commitment message, for example, should be instantly sent. There's no
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* great way of doing this, unfortunately.
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*
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* Setting TCP_NODELAY on Linux flushes the socket, which really means
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* we'd want to toggle on then off it *after* sending. But Linux has
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* TCP_CORK. On FreeBSD, it seems (looking at source) not to, so
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* there we'd want to set it before the send, and reenable it
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* afterwards. Even if this is wrong on other non-Linux platforms, it
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* only means one extra packet.
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*/
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void sync_crypto_write_no_delay(struct per_peer_state *pps,
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const void *msg TAKES)
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{
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int val;
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int opt;
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const char *optname;
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static bool complained = false;
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#ifdef TCP_CORK
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opt = TCP_CORK;
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optname = "TCP_CORK";
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#elif defined(TCP_NODELAY)
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opt = TCP_NODELAY;
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optname = "TCP_NODELAY";
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#else
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#error "Please report platform with neither TCP_CORK nor TCP_NODELAY?"
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#endif
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val = 1;
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if (setsockopt(pps->peer_fd, IPPROTO_TCP, opt, &val, sizeof(val)) != 0) {
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/* This actually happens in testing, where we blackhole the fd */
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if (!complained) {
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status_unusual("setsockopt %s=1: %s",
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optname,
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strerror(errno));
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complained = true;
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}
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}
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sync_crypto_write(pps, msg);
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val = 0;
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setsockopt(pps->peer_fd, IPPROTO_TCP, opt, &val, sizeof(val));
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}
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u8 *sync_crypto_read(const tal_t *ctx, struct per_peer_state *pps)
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{
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u8 hdr[18], *enc, *dec;
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u16 len;
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if (!read_all(pps->peer_fd, hdr, sizeof(hdr))) {
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status_trace("Failed reading header: %s", strerror(errno));
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peer_failed_connection_lost();
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}
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if (!cryptomsg_decrypt_header(&pps->cs, hdr, &len)) {
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status_trace("Failed hdr decrypt with rn=%"PRIu64,
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pps->cs.rn-1);
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peer_failed_connection_lost();
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}
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enc = tal_arr(ctx, u8, len + 16);
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if (!read_all(pps->peer_fd, enc, tal_count(enc))) {
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status_trace("Failed reading body: %s", strerror(errno));
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peer_failed_connection_lost();
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}
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dec = cryptomsg_decrypt_body(ctx, &pps->cs, enc);
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tal_free(enc);
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if (!dec)
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peer_failed_connection_lost();
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else
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status_peer_io(LOG_IO_IN, dec);
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return dec;
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}
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