===================================================================
RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/ssh/channels.c,v
retrieving revision 1.402
retrieving revision 1.403
diff -u -r1.402 -r1.403
--- src/usr.bin/ssh/channels.c	2020/09/20 05:47:25	1.402
+++ src/usr.bin/ssh/channels.c	2020/10/18 11:32:01	1.403
@@ -1,4 +1,4 @@
-/* $OpenBSD: channels.c,v 1.402 2020/09/20 05:47:25 djm Exp $ */
+/* $OpenBSD: channels.c,v 1.403 2020/10/18 11:32:01 djm Exp $ */
 /*
  * Author: Tatu Ylonen <ylo@cs.hut.fi>
  * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@@ -222,7 +222,7 @@
 	struct ssh_channels *sc;
 
 	if ((sc = calloc(1, sizeof(*sc))) == NULL)
-		fatal("%s: allocation failed", __func__);
+		fatal_f("allocation failed");
 	sc->channels_alloc = 10;
 	sc->channels = xcalloc(sc->channels_alloc, sizeof(*sc->channels));
 	sc->IPv4or6 = AF_UNSPEC;
@@ -237,12 +237,12 @@
 	Channel *c;
 
 	if (id < 0 || (u_int)id >= ssh->chanctxt->channels_alloc) {
-		logit("%s: %d: bad id", __func__, id);
+		logit_f("%d: bad id", id);
 		return NULL;
 	}
 	c = ssh->chanctxt->channels[id];
 	if (c == NULL) {
-		logit("%s: %d: bad id: channel free", __func__, id);
+		logit_f("%d: bad id: channel free", id);
 		return NULL;
 	}
 	return c;
@@ -361,8 +361,8 @@
 		 */
 		found = sc->channels_alloc;
 		if (sc->channels_alloc > CHANNELS_MAX_CHANNELS)
-			fatal("%s: internal error: channels_alloc %d too big",
-			    __func__, sc->channels_alloc);
+			fatal_f("internal error: channels_alloc %d too big",
+			    sc->channels_alloc);
 		sc->channels = xrecallocarray(sc->channels, sc->channels_alloc,
 		    sc->channels_alloc + 10, sizeof(*sc->channels));
 		sc->channels_alloc += 10;
@@ -373,9 +373,9 @@
 	if ((c->input = sshbuf_new()) == NULL ||
 	    (c->output = sshbuf_new()) == NULL ||
 	    (c->extended = sshbuf_new()) == NULL)
-		fatal("%s: sshbuf_new failed", __func__);
+		fatal_f("sshbuf_new failed");
 	if ((r = sshbuf_set_max_size(c->input, CHAN_INPUT_MAX)) != 0)
-		fatal("%s: sshbuf_set_max_size: %s", __func__, ssh_err(r));
+		fatal_fr(r, "sshbuf_set_max_size");
 	c->ostate = CHAN_OUTPUT_OPEN;
 	c->istate = CHAN_INPUT_OPEN;
 	channel_register_fds(ssh, c, rfd, wfd, efd, extusage, nonblock, 0);
@@ -482,7 +482,7 @@
 		return &sc->remote_perms;
 		break;
 	default:
-		fatal("%s: invalid forwarding direction %d", __func__, where);
+		fatal_f("invalid forwarding direction %d", where);
 	}
 }
 
@@ -503,7 +503,7 @@
 		*npermpp = &pset->num_permitted_admin;
 		break;
 	default:
-		fatal("%s: invalid forwarding client %d", __func__, who);
+		fatal_f("invalid forwarding client %d", who);
 	}
 }
 
@@ -520,7 +520,7 @@
 	permission_set_get_array(ssh, who, where, &permp, &npermp);
 
 	if (*npermp >= INT_MAX)
-		fatal("%s: %s overflow", __func__, fwd_ident(who, where));
+		fatal_f("%s overflow", fwd_ident(who, where));
 
 	*permp = xrecallocarray(*permp, *npermp, *npermp + 1, sizeof(**permp));
 	n = (*npermp)++;
@@ -560,8 +560,7 @@
 		    channel_rfwd_bind_host(perm->listen_host))) != 0 ||
 		    (r = sshpkt_put_u32(ssh, perm->listen_port)) != 0 ||
 		    (r = sshpkt_send(ssh)) != 0) {
-			fatal("%s: channel %i: %s", __func__,
-			    c->self, ssh_err(r));
+			fatal_fr(r, "channel %i", c->self);
 		}
 		fwd_perm_clear(perm); /* unregister */
 	}
@@ -761,7 +760,7 @@
 		case SSH_CHANNEL_MUX_PROXY:
 			return 1;
 		default:
-			fatal("%s: bad channel type %d", __func__, c->type);
+			fatal_f("bad channel type %d", c->type);
 			/* NOTREACHED */
 		}
 	}
@@ -803,7 +802,7 @@
 		case SSH_CHANNEL_X11_OPEN:
 			return i;
 		default:
-			fatal("%s: bad channel type %d", __func__, c->type);
+			fatal_f("bad channel type %d", c->type);
 			/* NOTREACHED */
 		}
 	}
@@ -860,10 +859,10 @@
 	char *cp, *ret;
 
 	if ((buf = sshbuf_new()) == NULL)
-		fatal("%s: sshbuf_new", __func__);
+		fatal_f("sshbuf_new");
 	if ((r = sshbuf_putf(buf,
 	    "The following connections are open:\r\n")) != 0)
-		fatal("%s: sshbuf_putf: %s", __func__, ssh_err(r));
+		fatal_fr(r, "sshbuf_putf");
 	for (i = 0; i < ssh->chanctxt->channels_alloc; i++) {
 		c = ssh->chanctxt->channels[i];
 		if (c == NULL)
@@ -894,18 +893,17 @@
 			if ((r = sshbuf_putf(buf, "  #%d %.300s (%s)\r\n",
 			    c->self, c->remote_name, cp)) != 0) {
 				free(cp);
-				fatal("%s: sshbuf_putf: %s",
-				    __func__, ssh_err(r));
+				fatal_fr(r, "sshbuf_putf");
 			}
 			free(cp);
 			continue;
 		default:
-			fatal("%s: bad channel type %d", __func__, c->type);
+			fatal_f("bad channel type %d", c->type);
 			/* NOTREACHED */
 		}
 	}
 	if ((ret = sshbuf_dup_string(buf)) == NULL)
-		fatal("%s: sshbuf_dup_string", __func__);
+		fatal_f("sshbuf_dup_string");
 	sshbuf_free(buf);
 	return ret;
 }
@@ -920,7 +918,7 @@
 	    (r = sshpkt_put_u32(ssh, c->self)) != 0 ||
 	    (r = sshpkt_put_u32(ssh, c->local_window)) != 0 ||
 	    (r = sshpkt_put_u32(ssh, c->local_maxpacket)) != 0) {
-		fatal("%s: channel %i: open: %s", where, c->self, ssh_err(r));
+		fatal_r(r, "%s: channel %i: open", where, c->self);
 	}
 }
 
@@ -937,7 +935,7 @@
 	debug2("channel %d: send open", id);
 	open_preamble(ssh, __func__, c, c->ctype);
 	if ((r = sshpkt_send(ssh)) != 0)
-		fatal("%s: channel %i: %s", __func__, c->self, ssh_err(r));
+		fatal_fr(r, "channel %i", c->self);
 }
 
 void
@@ -947,18 +945,18 @@
 	int r;
 
 	if (c == NULL) {
-		logit("%s: %d: unknown channel id", __func__, id);
+		logit_f("%d: unknown channel id", id);
 		return;
 	}
 	if (!c->have_remote_id)
-		fatal(":%s: channel %d: no remote id", __func__, c->self);
+		fatal_f("channel %d: no remote id", c->self);
 
 	debug2("channel %d: request %s confirm %d", id, service, wantconfirm);
 	if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_REQUEST)) != 0 ||
 	    (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 ||
 	    (r = sshpkt_put_cstring(ssh, service)) != 0 ||
 	    (r = sshpkt_put_u8(ssh, wantconfirm)) != 0) {
-		fatal("%s: channel %i: %s", __func__, c->self, ssh_err(r));
+		fatal_fr(r, "channel %i", c->self);
 	}
 }
 
@@ -970,7 +968,7 @@
 	Channel *c;
 
 	if ((c = channel_lookup(ssh, id)) == NULL)
-		fatal("%s: %d: bad id", __func__, id);
+		fatal_f("%d: bad id", id);
 
 	cc = xcalloc(1, sizeof(*cc));
 	cc->cb = cb;
@@ -986,7 +984,7 @@
 	Channel *c = channel_lookup(ssh, id);
 
 	if (c == NULL) {
-		logit("%s: %d: bad id", __func__, id);
+		logit_f("%d: bad id", id);
 		return;
 	}
 	c->open_confirm = fn;
@@ -1000,7 +998,7 @@
 	Channel *c = channel_by_id(ssh, id);
 
 	if (c == NULL) {
-		logit("%s: %d: bad id", __func__, id);
+		logit_f("%d: bad id", id);
 		return;
 	}
 	c->detach_user = fn;
@@ -1013,7 +1011,7 @@
 	Channel *c = channel_by_id(ssh, id);
 
 	if (c == NULL) {
-		logit("%s: %d: bad id", __func__, id);
+		logit_f("%d: bad id", id);
 		return;
 	}
 	c->detach_user = NULL;
@@ -1027,7 +1025,7 @@
 	Channel *c = channel_lookup(ssh, id);
 
 	if (c == NULL) {
-		logit("%s: %d: bad id", __func__, id);
+		logit_f("%d: bad id", id);
 		return;
 	}
 	c->input_filter = ifn;
@@ -1046,7 +1044,7 @@
 	if (c == NULL || c->type != SSH_CHANNEL_LARVAL)
 		fatal("channel_activate for non-larval channel %d.", id);
 	if (!c->have_remote_id)
-		fatal(":%s: channel %d: no remote id", __func__, c->self);
+		fatal_f("channel %d: no remote id", c->self);
 
 	channel_register_fds(ssh, c, rfd, wfd, efd, extusage, nonblock, is_tty);
 	c->type = SSH_CHANNEL_OPEN;
@@ -1056,7 +1054,7 @@
 	    (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 ||
 	    (r = sshpkt_put_u32(ssh, c->local_window)) != 0 ||
 	    (r = sshpkt_send(ssh)) != 0)
-		fatal("%s: channel %i: %s", __func__, c->self, ssh_err(r));
+		fatal_fr(r, "channel %i", c->self);
 }
 
 static void
@@ -1285,24 +1283,21 @@
 	    (r = sshbuf_get(input, &s4_req.command, 1)) != 0 ||
 	    (r = sshbuf_get(input, &s4_req.dest_port, 2)) != 0 ||
 	    (r = sshbuf_get(input, &s4_req.dest_addr, 4)) != 0) {
-		debug("channels %d: decode socks4: %s", c->self, ssh_err(r));
+		debug_r(r, "channels %d: decode socks4", c->self);
 		return -1;
 	}
 	have = sshbuf_len(input);
 	p = sshbuf_ptr(input);
 	if (memchr(p, '\0', have) == NULL) {
-		error("channel %d: decode socks4: user not nul terminated",
-		    c->self);
+		error("channel %d: decode socks4: unterminated user", c->self);
 		return -1;
 	}
 	len = strlen(p);
 	debug2("channel %d: decode socks4: user %s/%d", c->self, p, len);
 	len++; /* trailing '\0' */
 	strlcpy(username, p, sizeof(username));
-	if ((r = sshbuf_consume(input, len)) != 0) {
-		fatal("%s: channel %d: consume: %s", __func__,
-		    c->self, ssh_err(r));
-	}
+	if ((r = sshbuf_consume(input, len)) != 0)
+		fatal_fr(r, "channel %d: consume", c->self);
 	free(c->path);
 	c->path = NULL;
 	if (need == 1) {			/* SOCKS4: one string */
@@ -1326,10 +1321,8 @@
 			return -1;
 		}
 		c->path = xstrdup(p);
-		if ((r = sshbuf_consume(input, len)) != 0) {
-			fatal("%s: channel %d: consume: %s", __func__,
-			    c->self, ssh_err(r));
-		}
+		if ((r = sshbuf_consume(input, len)) != 0)
+			fatal_fr(r, "channel %d: consume", c->self);
 	}
 	c->host_port = ntohs(s4_req.dest_port);
 
@@ -1345,10 +1338,8 @@
 	s4_rsp.command = 90;			/* cd: req granted */
 	s4_rsp.dest_port = 0;			/* ignored */
 	s4_rsp.dest_addr.s_addr = INADDR_ANY;	/* ignored */
-	if ((r = sshbuf_put(output, &s4_rsp, sizeof(s4_rsp))) != 0) {
-		fatal("%s: channel %d: append reply: %s", __func__,
-		    c->self, ssh_err(r));
-	}
+	if ((r = sshbuf_put(output, &s4_rsp, sizeof(s4_rsp))) != 0)
+		fatal_fr(r, "channel %d: append reply", c->self);
 	return 1;
 }
 
@@ -1401,16 +1392,12 @@
 			    c->self);
 			return -1;
 		}
-		if ((r = sshbuf_consume(input, nmethods + 2)) != 0) {
-			fatal("%s: channel %d: consume: %s", __func__,
-			    c->self, ssh_err(r));
-		}
+		if ((r = sshbuf_consume(input, nmethods + 2)) != 0)
+			fatal_fr(r, "channel %d: consume", c->self);
 		/* version, method */
 		if ((r = sshbuf_put_u8(output, 0x05)) != 0 ||
-		    (r = sshbuf_put_u8(output, SSH_SOCKS5_NOAUTH)) != 0) {
-			fatal("%s: channel %d: append reply: %s", __func__,
-			    c->self, ssh_err(r));
-		}
+		    (r = sshbuf_put_u8(output, SSH_SOCKS5_NOAUTH)) != 0)
+			fatal_fr(r, "channel %d: append reply", c->self);
 		c->flags |= SSH_SOCKS5_AUTHDONE;
 		debug2("channel %d: socks5 auth done", c->self);
 		return 0;				/* need more */
@@ -1447,20 +1434,16 @@
 		need++;
 	if (have < need)
 		return 0;
-	if ((r = sshbuf_consume(input, sizeof(s5_req))) != 0) {
-		fatal("%s: channel %d: consume: %s", __func__,
-		    c->self, ssh_err(r));
-	}
+	if ((r = sshbuf_consume(input, sizeof(s5_req))) != 0)
+		fatal_fr(r, "channel %d: consume", c->self);
 	if (s5_req.atyp == SSH_SOCKS5_DOMAIN) {
 		/* host string length */
-		if ((r = sshbuf_consume(input, 1)) != 0) {
-			fatal("%s: channel %d: consume: %s", __func__,
-			    c->self, ssh_err(r));
-		}
+		if ((r = sshbuf_consume(input, 1)) != 0)
+			fatal_fr(r, "channel %d: consume", c->self);
 	}
 	if ((r = sshbuf_get(input, &dest_addr, addrlen)) != 0 ||
 	    (r = sshbuf_get(input, &dest_port, 2)) != 0) {
-		debug("channel %d: parse addr/port: %s", c->self, ssh_err(r));
+		debug_r(r, "channel %d: parse addr/port", c->self);
 		return -1;
 	}
 	dest_addr[addrlen] = '\0';
@@ -1492,8 +1475,7 @@
 	if ((r = sshbuf_put(output, &s5_rsp, sizeof(s5_rsp))) != 0 ||
 	    (r = sshbuf_put_u32(output, ntohl(INADDR_ANY))) != 0 ||
 	    (r = sshbuf_put(output, &dest_port, sizeof(dest_port))) != 0)
-		fatal("%s: channel %d: append reply: %s", __func__,
-		    c->self, ssh_err(r));
+		fatal_fr(r, "channel %d: append reply", c->self);
 	return 1;
 }
 
@@ -1503,7 +1485,7 @@
 {
 	Channel *c;
 
-	debug("%s %s:%d", __func__, host_to_connect, port_to_connect);
+	debug_f("%s:%d", host_to_connect, port_to_connect);
 
 	c = channel_new(ssh, "stdio-forward", SSH_CHANNEL_OPENING, in, out,
 	    -1, CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
@@ -1592,10 +1574,8 @@
 	/* sshbuf_dump(c->output, stderr); */
 	/* EOF received */
 	if (c->flags & CHAN_EOF_RCVD) {
-		if ((r = sshbuf_consume(c->output, have)) != 0) {
-			fatal("%s: channel %d: consume: %s",
-			    __func__, c->self, ssh_err(r));
-		}
+		if ((r = sshbuf_consume(c->output, have)) != 0)
+			fatal_fr(r, "channel %d: consume", c->self);
 		rdynamic_close(ssh, c);
 		return;
 	}
@@ -1627,13 +1607,10 @@
 			    (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 ||
 			    (r = sshpkt_put_stringb(ssh, c->input)) != 0 ||
 			    (r = sshpkt_send(ssh)) != 0) {
-				fatal("%s: channel %i: rdynamic: %s", __func__,
-				    c->self, ssh_err(r));
+				fatal_fr(r, "channel %i: rdynamic", c->self);
 			}
-			if ((r = sshbuf_consume(c->input, len)) != 0) {
-				fatal("%s: channel %d: consume: %s",
-				    __func__, c->self, ssh_err(r));
-			}
+			if ((r = sshbuf_consume(c->input, len)) != 0)
+				fatal_fr(r, "channel %d: consume", c->self);
 			c->remote_window -= len;
 		}
 	} else if (rdynamic_connect_finish(ssh, c) < 0) {
@@ -1686,11 +1663,10 @@
 	open_preamble(ssh, __func__, nc, "x11");
 	if ((r = sshpkt_put_cstring(ssh, remote_ipaddr)) != 0 ||
 	    (r = sshpkt_put_u32(ssh, remote_port)) != 0) {
-		fatal("%s: channel %i: reply %s", __func__,
-		    c->self, ssh_err(r));
+		fatal_fr(r, "channel %i: reply", c->self);
 	}
 	if ((r = sshpkt_send(ssh)) != 0)
-		fatal("%s: channel %i: send %s", __func__, c->self, ssh_err(r));
+		fatal_fr(r, "channel %i: send", c->self);
 	free(remote_ipaddr);
 }
 
@@ -1721,46 +1697,34 @@
 	if (strcmp(rtype, "direct-tcpip") == 0) {
 		/* target host, port */
 		if ((r = sshpkt_put_cstring(ssh, c->path)) != 0 ||
-		    (r = sshpkt_put_u32(ssh, c->host_port)) != 0) {
-			fatal("%s: channel %i: reply %s", __func__,
-			    c->self, ssh_err(r));
-		}
+		    (r = sshpkt_put_u32(ssh, c->host_port)) != 0)
+			fatal_fr(r, "channel %i: reply", c->self);
 	} else if (strcmp(rtype, "direct-streamlocal@openssh.com") == 0) {
 		/* target path */
-		if ((r = sshpkt_put_cstring(ssh, c->path)) != 0) {
-			fatal("%s: channel %i: reply %s", __func__,
-			    c->self, ssh_err(r));
-		}
+		if ((r = sshpkt_put_cstring(ssh, c->path)) != 0)
+			fatal_fr(r, "channel %i: reply", c->self);
 	} else if (strcmp(rtype, "forwarded-streamlocal@openssh.com") == 0) {
 		/* listen path */
-		if ((r = sshpkt_put_cstring(ssh, c->path)) != 0) {
-			fatal("%s: channel %i: reply %s", __func__,
-			    c->self, ssh_err(r));
-		}
+		if ((r = sshpkt_put_cstring(ssh, c->path)) != 0)
+			fatal_fr(r, "channel %i: reply", c->self);
 	} else {
 		/* listen address, port */
 		if ((r = sshpkt_put_cstring(ssh, c->path)) != 0 ||
-		    (r = sshpkt_put_u32(ssh, local_port)) != 0) {
-			fatal("%s: channel %i: reply %s", __func__,
-			    c->self, ssh_err(r));
-		}
+		    (r = sshpkt_put_u32(ssh, local_port)) != 0)
+			fatal_fr(r, "channel %i: reply", c->self);
 	}
 	if (strcmp(rtype, "forwarded-streamlocal@openssh.com") == 0) {
 		/* reserved for future owner/mode info */
-		if ((r = sshpkt_put_cstring(ssh, "")) != 0) {
-			fatal("%s: channel %i: reply %s", __func__,
-			    c->self, ssh_err(r));
-		}
+		if ((r = sshpkt_put_cstring(ssh, "")) != 0)
+			fatal_fr(r, "channel %i: reply", c->self);
 	} else {
 		/* originator host and port */
 		if ((r = sshpkt_put_cstring(ssh, remote_ipaddr)) != 0 ||
-		    (r = sshpkt_put_u32(ssh, (u_int)remote_port)) != 0) {
-			fatal("%s: channel %i: reply %s", __func__,
-			    c->self, ssh_err(r));
-		}
+		    (r = sshpkt_put_u32(ssh, (u_int)remote_port)) != 0)
+			fatal_fr(r, "channel %i: reply", c->self);
 	}
 	if ((r = sshpkt_send(ssh)) != 0)
-		fatal("%s: channel %i: send %s", __func__, c->self, ssh_err(r));
+		fatal_fr(r, "channel %i: send", c->self);
 	free(remote_ipaddr);
 	free(local_ipaddr);
 }
@@ -1860,7 +1824,7 @@
 	    0, "accepted auth socket", 1);
 	open_preamble(ssh, __func__, nc, "auth-agent@openssh.com");
 	if ((r = sshpkt_send(ssh)) != 0)
-		fatal("%s: channel %i: %s", __func__, c->self, ssh_err(r));
+		fatal_fr(r, "channel %i", c->self);
 }
 
 static void
@@ -1873,7 +1837,7 @@
 	if (!FD_ISSET(c->sock, writeset))
 		return;
 	if (!c->have_remote_id)
-		fatal(":%s: channel %d: no remote id", __func__, c->self);
+		fatal_f("channel %d: no remote id", c->self);
 	/* for rdynamic the OPEN_CONFIRMATION has been sent already */
 	isopen = (c->type == SSH_CHANNEL_RDYNAMIC_FINISH);
 	if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, &err, &sz) == -1) {
@@ -1893,13 +1857,9 @@
 			    (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 ||
 			    (r = sshpkt_put_u32(ssh, c->self)) != 0 ||
 			    (r = sshpkt_put_u32(ssh, c->local_window)) != 0 ||
-			    (r = sshpkt_put_u32(ssh, c->local_maxpacket))
-			    != 0)
-				fatal("%s: channel %i: confirm: %s", __func__,
-				    c->self, ssh_err(r));
-			if ((r = sshpkt_send(ssh)) != 0)
-				fatal("%s: channel %i: %s", __func__, c->self,
-				    ssh_err(r));
+			    (r = sshpkt_put_u32(ssh, c->local_maxpacket)) != 0 ||
+			    (r = sshpkt_send(ssh)) != 0)
+				fatal_fr(r, "channel %i open confirm", c->self);
 		}
 	} else {
 		debug("channel %d: connection failed: %s",
@@ -1924,13 +1884,9 @@
 			    (r = sshpkt_put_u32(ssh,
 			    SSH2_OPEN_CONNECT_FAILED)) != 0 ||
 			    (r = sshpkt_put_cstring(ssh, strerror(err))) != 0 ||
-			    (r = sshpkt_put_cstring(ssh, "")) != 0) {
-				fatal("%s: channel %i: failure: %s", __func__,
-				    c->self, ssh_err(r));
-			}
-			if ((r = sshpkt_send(ssh)) != 0)
-				fatal("%s: channel %i: %s", __func__, c->self,
-				    ssh_err(r));
+			    (r = sshpkt_put_cstring(ssh, "")) != 0 ||
+			    (r = sshpkt_send(ssh)) != 0)
+				fatal_fr(r, "channel %i: failure", c->self);
 			chan_mark_dead(ssh, c);
 		}
 	}
@@ -1969,12 +1925,9 @@
 		}
 	} else if (c->datagram) {
 		if ((r = sshbuf_put_string(c->input, buf, len)) != 0)
-			fatal("%s: channel %d: put datagram: %s", __func__,
-			    c->self, ssh_err(r));
-	} else if ((r = sshbuf_put(c->input, buf, len)) != 0) {
-		fatal("%s: channel %d: put data: %s", __func__,
-		    c->self, ssh_err(r));
-	}
+			fatal_fr(r, "channel %i: put datagram", c->self);
+	} else if ((r = sshbuf_put(c->input, buf, len)) != 0)
+		fatal_fr(r, "channel %i: put data", c->self);
 	return 1;
 }
 
@@ -2004,8 +1957,7 @@
 		}
 	} else if (c->datagram) {
 		if ((r = sshbuf_get_string(c->output, &data, &dlen)) != 0)
-			fatal("%s: channel %d: get datagram: %s", __func__,
-			    c->self, ssh_err(r));
+			fatal_fr(r, "channel %i: get datagram", c->self);
 		buf = data;
 	} else {
 		buf = data = sshbuf_mutable_ptr(c->output);
@@ -2048,14 +2000,11 @@
 			 */
 			if ((r = sshpkt_msg_ignore(ssh, 4+len)) != 0 ||
 			    (r = sshpkt_send(ssh)) != 0)
-				fatal("%s: channel %d: ignore: %s",
-				    __func__, c->self, ssh_err(r));
+				fatal_fr(r, "channel %i: ignore", c->self);
 		}
 	}
-	if ((r = sshbuf_consume(c->output, len)) != 0) {
-		fatal("%s: channel %d: consume: %s",
-		    __func__, c->self, ssh_err(r));
-	}
+	if ((r = sshbuf_consume(c->output, len)) != 0)
+		fatal_fr(r, "channel %i: consume", c->self);
  out:
 	c->local_consumed += olen - sshbuf_len(c->output);
 
@@ -2081,10 +2030,8 @@
 		debug2("channel %d: closing write-efd %d", c->self, c->efd);
 		channel_close_fd(ssh, &c->efd);
 	} else {
-		if ((r = sshbuf_consume(c->extended, len)) != 0) {
-			fatal("%s: channel %d: consume: %s",
-			    __func__, c->self, ssh_err(r));
-		}
+		if ((r = sshbuf_consume(c->extended, len)) != 0)
+			fatal_fr(r, "channel %i: consume", c->self);
 		c->local_consumed += len;
 	}
 	return 1;
@@ -2106,18 +2053,12 @@
 	if (len == -1 && (errno == EINTR || errno == EAGAIN))
 		return 1;
 	if (len <= 0) {
-		debug2("channel %d: closing read-efd %d",
-		    c->self, c->efd);
+		debug2("channel %d: closing read-efd %d", c->self, c->efd);
 		channel_close_fd(ssh, &c->efd);
-	} else {
-		if (c->extended_usage == CHAN_EXTENDED_IGNORE) {
-			debug3("channel %d: discard efd",
-			    c->self);
-		} else if ((r = sshbuf_put(c->extended, buf, len)) != 0) {
-			fatal("%s: channel %d: append: %s",
-			    __func__, c->self, ssh_err(r));
-		}
-	}
+	} else if (c->extended_usage == CHAN_EXTENDED_IGNORE)
+		debug3("channel %d: discard efd", c->self);
+	else if ((r = sshbuf_put(c->extended, buf, len)) != 0)
+		fatal_fr(r, "channel %i: append", c->self);
 	return 1;
 }
 
@@ -2151,19 +2092,16 @@
 	    c->local_window < c->local_window_max/2) &&
 	    c->local_consumed > 0) {
 		if (!c->have_remote_id)
-			fatal(":%s: channel %d: no remote id",
-			    __func__, c->self);
+			fatal_f("channel %d: no remote id", c->self);
 		if ((r = sshpkt_start(ssh,
 		    SSH2_MSG_CHANNEL_WINDOW_ADJUST)) != 0 ||
 		    (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 ||
 		    (r = sshpkt_put_u32(ssh, c->local_consumed)) != 0 ||
 		    (r = sshpkt_send(ssh)) != 0) {
-			fatal("%s: channel %i: %s", __func__,
-			    c->self, ssh_err(r));
+			fatal_fr(r, "channel %i", c->self);
 		}
-		debug2("channel %d: window %d sent adjust %d",
-		    c->self, c->local_window,
-		    c->local_consumed);
+		debug2("channel %d: window %d sent adjust %d", c->self,
+		    c->local_window, c->local_consumed);
 		c->local_window += c->local_consumed;
 		c->local_consumed = 0;
 	}
@@ -2198,10 +2136,8 @@
 			    c->self, c->rfd, len);
 			chan_read_failed(ssh, c);
 			return 0;
-		} else if ((r = sshbuf_put(c->input, buf, len)) != 0) {
-			fatal("%s: channel %d: append: %s",
-			    __func__, c->self, ssh_err(r));
-		}
+		} else if ((r = sshbuf_put(c->input, buf, len)) != 0)
+			fatal_fr(r, "channel %i: append", c->self);
 	}
 	return sshbuf_len(c->input);
 }
@@ -2262,8 +2198,7 @@
 		return;
 	}
 	if ((r = sshbuf_consume(c->output, len)) != 0)
-		fatal("%s: channel %d: consume: %s", __func__,
-		    c->self, ssh_err(r));
+		fatal_fr(r, "channel %i: consume", c->self);
 }
 
 static void
@@ -2297,15 +2232,14 @@
 	addrlen = sizeof(addr);
 	if ((newsock = accept(c->sock, (struct sockaddr*)&addr,
 	    &addrlen)) == -1) {
-		error("%s accept: %s", __func__, strerror(errno));
+		error_f("accept: %s", strerror(errno));
 		if (errno == EMFILE || errno == ENFILE)
 			c->notbefore = monotime() + 1;
 		return;
 	}
 
 	if (getpeereid(newsock, &euid, &egid) == -1) {
-		error("%s getpeereid failed: %s", __func__,
-		    strerror(errno));
+		error_f("getpeereid failed: %s", strerror(errno));
 		close(newsock);
 		return;
 	}
@@ -2319,7 +2253,7 @@
 	    newsock, newsock, -1, c->local_window_max,
 	    c->local_maxpacket, 0, "mux-control", 1);
 	nc->mux_rcb = c->mux_rcb;
-	debug3("%s: new mux channel %d fd %d", __func__, nc->self, nc->sock);
+	debug3_f("new mux channel %d fd %d", nc->self, nc->sock);
 	/* establish state */
 	nc->mux_rcb(ssh, nc);
 	/* mux state transitions must not elicit protocol messages */
@@ -2333,7 +2267,7 @@
 
 	if ((pre = calloc(SSH_CHANNEL_MAX_TYPE, sizeof(*pre))) == NULL ||
 	   (post = calloc(SSH_CHANNEL_MAX_TYPE, sizeof(*post))) == NULL)
-		fatal("%s: allocation failed", __func__);
+		fatal_f("allocation failed");
 
 	pre[SSH_CHANNEL_OPEN] =			&channel_pre_open;
 	pre[SSH_CHANNEL_X11_OPEN] =		&channel_pre_x11_open;
@@ -2425,8 +2359,8 @@
 				 * Collect the time that the earliest
 				 * channel comes off pause.
 				 */
-				debug3("%s: chan %d: skip for %d more seconds",
-				    __func__, c->self,
+				debug3_f("chan %d: skip for %d more "
+				    "seconds", c->self,
 				    (int)(c->notbefore - now));
 				if (*unpause_secs == 0 ||
 				    (c->notbefore - now) < *unpause_secs)
@@ -2436,8 +2370,8 @@
 		channel_garbage_collect(ssh, c);
 	}
 	if (unpause_secs != NULL && *unpause_secs != 0)
-		debug3("%s: first channel unpauses in %d seconds",
-		    __func__, (int)*unpause_secs);
+		debug3_f("first channel unpauses in %d seconds",
+		    (int)*unpause_secs);
 }
 
 /*
@@ -2536,13 +2470,12 @@
 	}
 
 	if (!c->have_remote_id)
-		fatal(":%s: channel %d: no remote id", __func__, c->self);
+		fatal_f("channel %d: no remote id", c->self);
 
 	if (c->datagram) {
 		/* Check datagram will fit; drop if not */
 		if ((r = sshbuf_get_string_direct(c->input, &pkt, &plen)) != 0)
-			fatal("%s: channel %d: get datagram: %s", __func__,
-			    c->self, ssh_err(r));
+			fatal_fr(r, "channel %i: get datagram", c->self);
 		/*
 		 * XXX this does tail-drop on the datagram queue which is
 		 * usually suboptimal compared to head-drop. Better to have
@@ -2556,10 +2489,8 @@
 		if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_DATA)) != 0 ||
 		    (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 ||
 		    (r = sshpkt_put_string(ssh, pkt, plen)) != 0 ||
-		    (r = sshpkt_send(ssh)) != 0) {
-			fatal("%s: channel %i: datagram: %s", __func__,
-			    c->self, ssh_err(r));
-		}
+		    (r = sshpkt_send(ssh)) != 0)
+			fatal_fr(r, "channel %i: send datagram", c->self);
 		c->remote_window -= plen;
 		return;
 	}
@@ -2574,13 +2505,10 @@
 	if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_DATA)) != 0 ||
 	    (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 ||
 	    (r = sshpkt_put_string(ssh, sshbuf_ptr(c->input), len)) != 0 ||
-	    (r = sshpkt_send(ssh)) != 0) {
-		fatal("%s: channel %i: data: %s", __func__,
-		    c->self, ssh_err(r));
-	}
+	    (r = sshpkt_send(ssh)) != 0)
+		fatal_fr(r, "channel %i: send data", c->self);
 	if ((r = sshbuf_consume(c->input, len)) != 0)
-		fatal("%s: channel %i: consume: %s", __func__,
-		    c->self, ssh_err(r));
+		fatal_fr(r, "channel %i: consume", c->self);
 	c->remote_window -= len;
 }
 
@@ -2605,18 +2533,15 @@
 	if (len == 0)
 		return;
 	if (!c->have_remote_id)
-		fatal(":%s: channel %d: no remote id", __func__, c->self);
+		fatal_f("channel %d: no remote id", c->self);
 	if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_EXTENDED_DATA)) != 0 ||
 	    (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 ||
 	    (r = sshpkt_put_u32(ssh, SSH2_EXTENDED_DATA_STDERR)) != 0 ||
 	    (r = sshpkt_put_string(ssh, sshbuf_ptr(c->extended), len)) != 0 ||
-	    (r = sshpkt_send(ssh)) != 0) {
-		fatal("%s: channel %i: data: %s", __func__,
-		    c->self, ssh_err(r));
-	}
+	    (r = sshpkt_send(ssh)) != 0)
+		fatal_fr(r, "channel %i: data", c->self);
 	if ((r = sshbuf_consume(c->extended, len)) != 0)
-		fatal("%s: channel %i: consume: %s", __func__,
-		    c->self, ssh_err(r));
+		fatal_fr(r, "channel %i: consume", c->self);
 	c->remote_window -= len;
 	debug2("channel %d: sent ext data %zu", c->self, len);
 }
@@ -2713,11 +2638,11 @@
 	/* sshbuf_dump(downstream->input, stderr); */
 	if ((r = sshbuf_get_string_direct(downstream->input, &cp, &have))
 	    != 0) {
-		error("%s: malformed message: %s", __func__, ssh_err(r));
+		error_fr(r, "parse");
 		return -1;
 	}
 	if (have < 2) {
-		error("%s: short message", __func__);
+		error_f("short message");
 		return -1;
 	}
 	type = cp[1];
@@ -2725,19 +2650,19 @@
 	cp += 2;
 	have -= 2;
 	if (ssh_packet_log_type(type))
-		debug3("%s: channel %u: down->up: type %u", __func__,
+		debug3_f("channel %u: down->up: type %u",
 		    downstream->self, type);
 
 	switch (type) {
 	case SSH2_MSG_CHANNEL_OPEN:
 		if ((original = sshbuf_from(cp, have)) == NULL ||
 		    (modified = sshbuf_new()) == NULL) {
-			error("%s: alloc", __func__);
+			error_f("alloc");
 			goto out;
 		}
 		if ((r = sshbuf_get_cstring(original, &ctype, NULL)) != 0 ||
 		    (r = sshbuf_get_u32(original, &id)) != 0) {
-			error("%s: parse error %s", __func__, ssh_err(r));
+			error_fr(r, "parse");
 			goto out;
 		}
 		c = channel_new(ssh, "mux proxy", SSH_CHANNEL_MUX_PROXY,
@@ -2747,7 +2672,7 @@
 		if ((r = sshbuf_put_cstring(modified, ctype)) != 0 ||
 		    (r = sshbuf_put_u32(modified, c->self)) != 0 ||
 		    (r = sshbuf_putb(modified, original)) != 0) {
-			error("%s: compose error %s", __func__, ssh_err(r));
+			error_fr(r, "compose");
 			channel_free(ssh, c);
 			goto out;
 		}
@@ -2759,12 +2684,12 @@
 		 */
 		if ((original = sshbuf_from(cp, have)) == NULL ||
 		    (modified = sshbuf_new()) == NULL) {
-			error("%s: alloc", __func__);
+			error_f("alloc");
 			goto out;
 		}
 		if ((r = sshbuf_get_u32(original, &remote_id)) != 0 ||
 		    (r = sshbuf_get_u32(original, &id)) != 0) {
-			error("%s: parse error %s", __func__, ssh_err(r));
+			error_fr(r, "parse");
 			goto out;
 		}
 		c = channel_new(ssh, "mux proxy", SSH_CHANNEL_MUX_PROXY,
@@ -2776,33 +2701,33 @@
 		if ((r = sshbuf_put_u32(modified, remote_id)) != 0 ||
 		    (r = sshbuf_put_u32(modified, c->self)) != 0 ||
 		    (r = sshbuf_putb(modified, original)) != 0) {
-			error("%s: compose error %s", __func__, ssh_err(r));
+			error_fr(r, "compose");
 			channel_free(ssh, c);
 			goto out;
 		}
 		break;
 	case SSH2_MSG_GLOBAL_REQUEST:
 		if ((original = sshbuf_from(cp, have)) == NULL) {
-			error("%s: alloc", __func__);
+			error_f("alloc");
 			goto out;
 		}
 		if ((r = sshbuf_get_cstring(original, &ctype, NULL)) != 0) {
-			error("%s: parse error %s", __func__, ssh_err(r));
+			error_fr(r, "parse");
 			goto out;
 		}
 		if (strcmp(ctype, "tcpip-forward") != 0) {
-			error("%s: unsupported request %s", __func__, ctype);
+			error_f("unsupported request %s", ctype);
 			goto out;
 		}
 		if ((r = sshbuf_get_u8(original, NULL)) != 0 ||
 		    (r = sshbuf_get_cstring(original, &listen_host, NULL)) != 0 ||
 		    (r = sshbuf_get_u32(original, &listen_port)) != 0) {
-			error("%s: parse error %s", __func__, ssh_err(r));
+			error_fr(r, "parse");
 			goto out;
 		}
 		if (listen_port > 65535) {
-			error("%s: tcpip-forward for %s: bad port %u",
-			    __func__, listen_host, listen_port);
+			error_f("tcpip-forward for %s: bad port %u",
+			    listen_host, listen_port);
 			goto out;
 		}
 		/* Record that connection to this host/port is permitted. */
@@ -2826,14 +2751,14 @@
 		if ((r = sshpkt_start(ssh, type)) != 0 ||
 		    (r = sshpkt_putb(ssh, modified)) != 0 ||
 		    (r = sshpkt_send(ssh)) != 0) {
-			error("%s: send %s", __func__, ssh_err(r));
+			error_fr(r, "send");
 			goto out;
 		}
 	} else {
 		if ((r = sshpkt_start(ssh, type)) != 0 ||
 		    (r = sshpkt_put(ssh, cp, have)) != 0 ||
 		    (r = sshpkt_send(ssh)) != 0) {
-			error("%s: send %s", __func__, ssh_err(r));
+			error_fr(r, "send");
 			goto out;
 		}
 	}
@@ -2884,18 +2809,17 @@
 	case SSH2_MSG_CHANNEL_REQUEST:
 		break;
 	default:
-		debug2("%s: channel %u: unsupported type %u", __func__,
-		    c->self, type);
+		debug2_f("channel %u: unsupported type %u", c->self, type);
 		return 0;
 	}
 	if ((b = sshbuf_new()) == NULL) {
-		error("%s: alloc reply", __func__);
+		error_f("alloc reply");
 		goto out;
 	}
 	/* get remaining payload (after id) */
 	cp = sshpkt_ptr(ssh, &len);
 	if (cp == NULL) {
-		error("%s: no packet", __func__);
+		error_f("no packet");
 		goto out;
 	}
 	/* translate id and send to muxclient */
@@ -2904,13 +2828,12 @@
 	    (r = sshbuf_put_u32(b, c->mux_downstream_id)) != 0 ||
 	    (r = sshbuf_put(b, cp, len)) != 0 ||
 	    (r = sshbuf_put_stringb(downstream->output, b)) != 0) {
-		error("%s: compose for muxclient %s", __func__, ssh_err(r));
+		error_fr(r, "compose muxclient");
 		goto out;
 	}
 	/* sshbuf_dump(b, stderr); */
 	if (ssh_packet_log_type(type))
-		debug3("%s: channel %u: up->down: type %u", __func__, c->self,
-		    type);
+		debug3_f("channel %u: up->down: type %u", c->self, type);
  out:
 	/* update state */
 	switch (type) {
@@ -2942,11 +2865,11 @@
 	int r;
 
 	if ((r = sshpkt_get_u32(ssh, &id)) != 0) {
-		error("%s: parse id: %s", where, ssh_err(r));
+		error_r(r, "%s: parse id", where);
 		ssh_packet_disconnect(ssh, "Invalid %s message", what);
 	}
 	if (id > INT_MAX) {
-		error("%s: bad channel id %u: %s", where, id, ssh_err(r));
+		error_r(r, "%s: bad channel id %u", where, id);
 		ssh_packet_disconnect(ssh, "Invalid %s channel id", what);
 	}
 	return (int)id;
@@ -2987,8 +2910,7 @@
 	/* Get the data. */
 	if ((r = sshpkt_get_string_direct(ssh, &data, &data_len)) != 0 ||
             (r = sshpkt_get_end(ssh)) != 0)
-		fatal("%s: channel %d: get data: %s", __func__,
-		    c->self, ssh_err(r));
+		fatal_fr(r, "channel %i: get data", c->self);
 
 	win_len = data_len;
 	if (c->datagram)
@@ -3019,11 +2941,9 @@
 
 	if (c->datagram) {
 		if ((r = sshbuf_put_string(c->output, data, data_len)) != 0)
-			fatal("%s: channel %d: append datagram: %s",
-			    __func__, c->self, ssh_err(r));
+			fatal_fr(r, "channel %i: append datagram", c->self);
 	} else if ((r = sshbuf_put(c->output, data, data_len)) != 0)
-		fatal("%s: channel %d: append data: %s",
-		    __func__, c->self, ssh_err(r));
+		fatal_fr(r, "channel %i: append data", c->self);
 
 	return 0;
 }
@@ -3053,7 +2973,7 @@
 	}
 
 	if ((r = sshpkt_get_u32(ssh, &tcode)) != 0) {
-		error("%s: parse tcode: %s", __func__, ssh_err(r));
+		error_fr(r, "parse tcode");
 		ssh_packet_disconnect(ssh, "Invalid extended_data message");
 	}
 	if (c->efd == -1 ||
@@ -3064,7 +2984,7 @@
 	}
 	if ((r = sshpkt_get_string_direct(ssh, &data, &data_len)) != 0 ||
             (r = sshpkt_get_end(ssh)) != 0) {
-		error("%s: parse data: %s", __func__, ssh_err(r));
+		error_fr(r, "parse data");
 		ssh_packet_disconnect(ssh, "Invalid extended_data message");
 	}
 
@@ -3076,7 +2996,7 @@
 	debug2("channel %d: rcvd ext data %zu", c->self, data_len);
 	/* XXX sshpkt_getb? */
 	if ((r = sshbuf_put(c->extended, data, data_len)) != 0)
-		error("%s: append: %s", __func__, ssh_err(r));
+		error_fr(r, "append");
 	c->local_window -= data_len;
 	return 0;
 }
@@ -3088,7 +3008,7 @@
 	int r;
 
         if ((r = sshpkt_get_end(ssh)) != 0) {
-		error("%s: parse data: %s", __func__, ssh_err(r));
+		error_fr(r, "parse data");
 		ssh_packet_disconnect(ssh, "Invalid ieof message");
 	}
 
@@ -3115,7 +3035,7 @@
 	if (channel_proxy_upstream(c, type, seq, ssh))
 		return 0;
         if ((r = sshpkt_get_end(ssh)) != 0) {
-		error("%s: parse data: %s", __func__, ssh_err(r));
+		error_fr(r, "parse data");
 		ssh_packet_disconnect(ssh, "Invalid oclose message");
 	}
 	chan_rcvd_oclose(ssh, c);
@@ -3142,7 +3062,7 @@
 	    (r = sshpkt_get_u32(ssh, &remote_window)) != 0 ||
 	    (r = sshpkt_get_u32(ssh, &remote_maxpacket)) != 0 ||
             (r = sshpkt_get_end(ssh)) != 0) {
-		error("%s: window/maxpacket: %s", __func__, ssh_err(r));
+		error_fr(r, "window/maxpacket");
 		ssh_packet_disconnect(ssh, "Invalid open confirmation message");
 	}
 
@@ -3151,9 +3071,9 @@
 	c->remote_maxpacket = remote_maxpacket;
 	c->type = SSH_CHANNEL_OPEN;
 	if (c->open_confirm) {
-		debug2("%s: channel %d: callback start", __func__, c->self);
+		debug2_f("channel %d: callback start", c->self);
 		c->open_confirm(ssh, c->self, 1, c->open_confirm_ctx);
-		debug2("%s: channel %d: callback done", __func__, c->self);
+		debug2_f("channel %d: callback done", c->self);
 	}
 	debug2("channel %d: open confirm rwindow %u rmax %u", c->self,
 	    c->remote_window, c->remote_maxpacket);
@@ -3190,23 +3110,23 @@
 		ssh_packet_disconnect(ssh, "Received open failure for "
 		    "non-opening channel %d.", c->self);
 	if ((r = sshpkt_get_u32(ssh, &reason)) != 0) {
-		error("%s: reason: %s", __func__, ssh_err(r));
+		error_fr(r, "parse reason");
 		ssh_packet_disconnect(ssh, "Invalid open failure message");
 	}
 	/* skip language */
 	if ((r = sshpkt_get_cstring(ssh, &msg, NULL)) != 0 ||
 	    (r = sshpkt_get_string_direct(ssh, NULL, NULL)) != 0 ||
             (r = sshpkt_get_end(ssh)) != 0) {
-		error("%s: message/lang: %s", __func__, ssh_err(r));
+		error_fr(r, "parse msg/lang");
 		ssh_packet_disconnect(ssh, "Invalid open failure message");
 	}
 	logit("channel %d: open failed: %s%s%s", c->self,
 	    reason2txt(reason), msg ? ": ": "", msg ? msg : "");
 	free(msg);
 	if (c->open_confirm) {
-		debug2("%s: channel %d: callback start", __func__, c->self);
+		debug2_f("channel %d: callback start", c->self);
 		c->open_confirm(ssh, c->self, 0, c->open_confirm_ctx);
-		debug2("%s: channel %d: callback done", __func__, c->self);
+		debug2_f("channel %d: callback done", c->self);
 	}
 	/* Schedule the channel for cleanup/deletion. */
 	chan_mark_dead(ssh, c);
@@ -3231,7 +3151,7 @@
 		return 0;
 	if ((r = sshpkt_get_u32(ssh, &adjust)) != 0 ||
             (r = sshpkt_get_end(ssh)) != 0) {
-		error("%s: adjust: %s", __func__, ssh_err(r));
+		error_fr(r, "parse adjust");
 		ssh_packet_disconnect(ssh, "Invalid window adjust message");
 	}
 	debug2("channel %d: rcvd adjust %u", c->self, adjust);
@@ -3253,10 +3173,10 @@
 	/* Reset keepalive timeout */
 	ssh_packet_set_alive_timeouts(ssh, 0);
 
-	debug2("%s: type %d id %d", __func__, type, id);
+	debug2_f("type %d id %d", type, id);
 
 	if ((c = channel_lookup(ssh, id)) == NULL) {
-		logit("%s: %d: unknown", __func__, id);
+		logit_f("%d: unknown", id);
 		return 0;
 	}
 	if (channel_proxy_upstream(c, type, seq, ssh))
@@ -3381,8 +3301,8 @@
 	/* Determine the bind address, cf. channel_fwd_bind_addr() comment */
 	addr = channel_fwd_bind_addr(ssh, fwd->listen_host, &wildcard,
 	    is_client, fwd_opts);
-	debug3("%s: type %d wildcard %d addr %s", __func__,
-	    type, wildcard, (addr == NULL) ? "NULL" : addr);
+	debug3_f("type %d wildcard %d addr %s", type, wildcard,
+	    (addr == NULL) ? "NULL" : addr);
 
 	/*
 	 * getaddrinfo returns a loopback address if the hostname is
@@ -3399,7 +3319,7 @@
 			ssh_packet_disconnect(ssh, "getaddrinfo: fatal error: %s",
 			    ssh_gai_strerror(r));
 		} else {
-			error("%s: getaddrinfo(%.64s): %s", __func__, addr,
+			error_f("getaddrinfo(%.64s): %s", addr,
 			    ssh_gai_strerror(r));
 		}
 		return 0;
@@ -3431,7 +3351,7 @@
 		if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop),
 		    strport, sizeof(strport),
 		    NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
-			error("%s: getnameinfo failed", __func__);
+			error_f("getnameinfo failed");
 			continue;
 		}
 		/* Create a port to listen for the host. */
@@ -3495,8 +3415,7 @@
 		success = 1;
 	}
 	if (success == 0)
-		error("%s: cannot listen to port: %d", __func__,
-		    fwd->listen_port);
+		error_f("cannot listen to port: %d", fwd->listen_port);
 	freeaddrinfo(aitop);
 	return success;
 }
@@ -3539,7 +3458,7 @@
 		port = PORT_STREAMLOCAL;
 		break;
 	default:
-		error("%s: unexpected channel type %d", __func__, type);
+		error_f("unexpected channel type %d", type);
 		return 0;
 	}
 
@@ -3552,7 +3471,7 @@
 		return 0;
 	}
 
-	debug3("%s: type %d path %s", __func__, type, fwd->listen_path);
+	debug3_f("type %d path %s", type, fwd->listen_path);
 
 	/* Start a Unix domain listener. */
 	omask = umask(fwd_opts->streamlocal_bind_mask);
@@ -3587,7 +3506,7 @@
 		if (c == NULL || c->type != SSH_CHANNEL_RPORT_LISTENER)
 			continue;
 		if (strcmp(c->path, host) == 0 && c->listening_port == port) {
-			debug2("%s: close channel %d", __func__, i);
+			debug2_f("close channel %d", i);
 			channel_free(ssh, c);
 			found = 1;
 		}
@@ -3609,7 +3528,7 @@
 		if (c->path == NULL)
 			continue;
 		if (strcmp(c->path, path) == 0) {
-			debug2("%s: close channel %d", __func__, i);
+			debug2_f("close channel %d", i);
 			channel_free(ssh, c);
 			found = 1;
 		}
@@ -3657,7 +3576,7 @@
 		    (c->listening_addr != NULL && addr == NULL))
 			continue;
 		if (addr == NULL || strcmp(c->listening_addr, addr) == 0) {
-			debug2("%s: close channel %d", __func__, i);
+			debug2_f("close channel %d", i);
 			channel_free(ssh, c);
 			found = 1;
 		}
@@ -3673,7 +3592,7 @@
 	int found = 0;
 
 	if (path == NULL) {
-		error("%s: no path specified.", __func__);
+		error_f("no path specified.");
 		return 0;
 	}
 
@@ -3684,7 +3603,7 @@
 		if (c->listening_addr == NULL)
 			continue;
 		if (strcmp(c->listening_addr, path) == 0) {
-			debug2("%s: close channel %d", __func__, i);
+			debug2_f("close channel %d", i);
 			channel_free(ssh, c);
 			found = 1;
 		}
@@ -3856,8 +3775,7 @@
 		    (r = sshpkt_put_cstring(ssh, fwd->listen_path)) != 0 ||
 		    (r = sshpkt_send(ssh)) != 0 ||
 		    (r = ssh_packet_write_wait(ssh)) != 0)
-			fatal("%s: request streamlocal: %s",
-			    __func__, ssh_err(r));
+			fatal_fr(r, "request streamlocal");
 	} else {
 		if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
 		    (r = sshpkt_put_cstring(ssh, "tcpip-forward")) != 0 ||
@@ -3867,8 +3785,7 @@
 		    (r = sshpkt_put_u32(ssh, fwd->listen_port)) != 0 ||
 		    (r = sshpkt_send(ssh)) != 0 ||
 		    (r = ssh_packet_write_wait(ssh)) != 0)
-			fatal("%s: request tcpip-forward: %s",
-			    __func__, ssh_err(r));
+			fatal_fr(r, "request tcpip-forward");
 	}
 	/* Assume that server accepts the request */
 	success = 1;
@@ -3976,7 +3893,7 @@
 		perm = NULL;
 	}
 	if (perm == NULL) {
-		debug("%s: requested forward not found", __func__);
+		debug_f("requested forward not found");
 		return -1;
 	}
 	if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
@@ -3985,7 +3902,7 @@
 	    (r = sshpkt_put_cstring(ssh, channel_rfwd_bind_host(host))) != 0 ||
 	    (r = sshpkt_put_u32(ssh, port)) != 0 ||
 	    (r = sshpkt_send(ssh)) != 0)
-		fatal("%s: send cancel: %s", __func__, ssh_err(r));
+		fatal_fr(r, "send cancel");
 
 	fwd_perm_clear(perm); /* unregister */
 
@@ -4012,7 +3929,7 @@
 		perm = NULL;
 	}
 	if (perm == NULL) {
-		debug("%s: requested forward not found", __func__);
+		debug_f("requested forward not found");
 		return -1;
 	}
 	if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
@@ -4021,7 +3938,7 @@
 	    (r = sshpkt_put_u8(ssh, 0)) != 0 || /* want reply */
 	    (r = sshpkt_put_cstring(ssh, path)) != 0 ||
 	    (r = sshpkt_send(ssh)) != 0)
-		fatal("%s: send cancel: %s", __func__, ssh_err(r));
+		fatal_fr(r, "send cancel");
 
 	fwd_perm_clear(perm); /* unregister */
 
@@ -4116,8 +4033,8 @@
 	struct permission_set *pset = &ssh->chanctxt->local_perms;
 
 	if (idx < 0 || (u_int)idx >= pset->num_permitted_user) {
-		debug("%s: index out of range: %d num_permitted_user %d",
-		    __func__, idx, pset->num_permitted_user);
+		debug_f("index out of range: %d num_permitted_user %d",
+		    idx, pset->num_permitted_user);
 		return;
 	}
 	debug("%s allowed port %d for forwarding to host %s port %d",
@@ -4184,7 +4101,7 @@
 			continue;
 		}
 		if (set_nonblock(sock) == -1)
-			fatal("%s: set_nonblock(%d)", __func__, sock);
+			fatal_f("set_nonblock(%d)", sock);
 		if (connect(sock, cctx->ai->ai_addr,
 		    cctx->ai->ai_addrlen) == -1 && errno != EINPROGRESS) {
 			debug("connect_next: host %.100s ([%.100s]:%s): "
@@ -4487,8 +4404,7 @@
 		    (r = sshpkt_put_u32(ssh, (u_int)ws.ws_xpixel)) != 0 ||
 		    (r = sshpkt_put_u32(ssh, (u_int)ws.ws_ypixel)) != 0 ||
 		    (r = sshpkt_send(ssh)) != 0)
-			fatal("%s: channel %u: send window-change: %s",
-			    __func__, i, ssh_err(r));
+			fatal_fr(r, "channel %u; send window-change", i);
 	}
 }
 
@@ -4512,10 +4428,8 @@
 	    (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 ||
 	    (r = sshpkt_put_u32(ssh, c->self)) != 0 ||
 	    (r = sshpkt_put_u32(ssh, c->local_window)) != 0 ||
-	    (r = sshpkt_put_u32(ssh, c->local_maxpacket)) != 0) {
-		fatal("%s: channel %i: confirm: %s", __func__,
-		    c->self, ssh_err(r));
-	}
+	    (r = sshpkt_put_u32(ssh, c->local_maxpacket)) != 0)
+		fatal_fr(r, "channel %i; confirm", c->self);
 	return c;
 }
 
@@ -4589,8 +4503,8 @@
 			}
 			set_reuseaddr(sock);
 			if (bind(sock, ai->ai_addr, ai->ai_addrlen) == -1) {
-				debug2("%s: bind port %d: %.100s", __func__,
-				    port, strerror(errno));
+				debug2_f("bind port %d: %.100s", port,
+				    strerror(errno));
 				close(sock);
 				for (n = 0; n < num_socks; n++)
 					close(socks[n]);
@@ -4795,9 +4709,10 @@
 		/* Extract real authentication data. */
 		sc->x11_saved_data = xmalloc(data_len);
 		for (i = 0; i < data_len; i++) {
-			if (sscanf(data + 2 * i, "%2x", &value) != 1)
+			if (sscanf(data + 2 * i, "%2x", &value) != 1) {
 				fatal("x11_request_forwarding: bad "
 				    "authentication data: %.100s", data);
+			}
 			sc->x11_saved_data[i] = value;
 		}
 		sc->x11_saved_data_len = data_len;
@@ -4819,6 +4734,6 @@
 	    (r = sshpkt_put_u32(ssh, screen_number)) != 0 ||
 	    (r = sshpkt_send(ssh)) != 0 ||
 	    (r = ssh_packet_write_wait(ssh)) != 0)
-		fatal("%s: send x11-req: %s", __func__, ssh_err(r));
+		fatal_fr(r, "send x11-req");
 	free(new_data);
 }