X-Git-Url: https://git.distorted.org.uk/u/mdw/putty/blobdiff_plain/2e85c969d67eb14a07314802d4ac5dd63eef660b..a1a1fae491039fc8fba576474e6bb56800f54652:/ssh.c

diff --git a/ssh.c b/ssh.c
index 41ef92fa..8b986ffa 100644
--- a/ssh.c
+++ b/ssh.c
@@ -166,6 +166,110 @@ static const char *const ssh2_disconnect_reasons[] = {
 #define BUG_SSH2_REKEY                           64
 #define BUG_SSH2_PK_SESSIONID                   128
 
+/*
+ * Codes for terminal modes.
+ * Most of these are the same in SSH-1 and SSH-2.
+ * This list is derived from draft-ietf-secsh-connect-25 and
+ * SSH-1 RFC-1.2.31.
+ */
+static const struct {
+    const char* const mode;
+    int opcode;
+    enum { TTY_OP_CHAR, TTY_OP_BOOL } type;
+} ssh_ttymodes[] = {
+    /* "V" prefix discarded for special characters relative to SSH specs */
+    { "INTR",	      1, TTY_OP_CHAR },
+    { "QUIT",	      2, TTY_OP_CHAR },
+    { "ERASE",	      3, TTY_OP_CHAR },
+    { "KILL",	      4, TTY_OP_CHAR },
+    { "EOF",	      5, TTY_OP_CHAR },
+    { "EOL",	      6, TTY_OP_CHAR },
+    { "EOL2",	      7, TTY_OP_CHAR },
+    { "START",	      8, TTY_OP_CHAR },
+    { "STOP",	      9, TTY_OP_CHAR },
+    { "SUSP",	     10, TTY_OP_CHAR },
+    { "DSUSP",	     11, TTY_OP_CHAR },
+    { "REPRINT",     12, TTY_OP_CHAR },
+    { "WERASE",	     13, TTY_OP_CHAR },
+    { "LNEXT",	     14, TTY_OP_CHAR },
+    { "FLUSH",	     15, TTY_OP_CHAR },
+    { "SWTCH",	     16, TTY_OP_CHAR },
+    { "STATUS",	     17, TTY_OP_CHAR },
+    { "DISCARD",     18, TTY_OP_CHAR },
+    { "IGNPAR",	     30, TTY_OP_BOOL },
+    { "PARMRK",	     31, TTY_OP_BOOL },
+    { "INPCK",	     32, TTY_OP_BOOL },
+    { "ISTRIP",	     33, TTY_OP_BOOL },
+    { "INLCR",	     34, TTY_OP_BOOL },
+    { "IGNCR",	     35, TTY_OP_BOOL },
+    { "ICRNL",	     36, TTY_OP_BOOL },
+    { "IUCLC",	     37, TTY_OP_BOOL },
+    { "IXON",	     38, TTY_OP_BOOL },
+    { "IXANY",	     39, TTY_OP_BOOL },
+    { "IXOFF",	     40, TTY_OP_BOOL },
+    { "IMAXBEL",     41, TTY_OP_BOOL },
+    { "ISIG",	     50, TTY_OP_BOOL },
+    { "ICANON",	     51, TTY_OP_BOOL },
+    { "XCASE",	     52, TTY_OP_BOOL },
+    { "ECHO",	     53, TTY_OP_BOOL },
+    { "ECHOE",	     54, TTY_OP_BOOL },
+    { "ECHOK",	     55, TTY_OP_BOOL },
+    { "ECHONL",	     56, TTY_OP_BOOL },
+    { "NOFLSH",	     57, TTY_OP_BOOL },
+    { "TOSTOP",	     58, TTY_OP_BOOL },
+    { "IEXTEN",	     59, TTY_OP_BOOL },
+    { "ECHOCTL",     60, TTY_OP_BOOL },
+    { "ECHOKE",	     61, TTY_OP_BOOL },
+    { "PENDIN",	     62, TTY_OP_BOOL }, /* XXX is this a real mode? */
+    { "OPOST",	     70, TTY_OP_BOOL },
+    { "OLCUC",	     71, TTY_OP_BOOL },
+    { "ONLCR",	     72, TTY_OP_BOOL },
+    { "OCRNL",	     73, TTY_OP_BOOL },
+    { "ONOCR",	     74, TTY_OP_BOOL },
+    { "ONLRET",	     75, TTY_OP_BOOL },
+    { "CS7",	     90, TTY_OP_BOOL },
+    { "CS8",	     91, TTY_OP_BOOL },
+    { "PARENB",	     92, TTY_OP_BOOL },
+    { "PARODD",	     93, TTY_OP_BOOL }
+};
+
+/* Miscellaneous other tty-related constants. */
+#define SSH_TTY_OP_END		  0
+/* The opcodes for ISPEED/OSPEED differ between SSH-1 and SSH-2. */
+#define SSH1_TTY_OP_ISPEED	192
+#define SSH1_TTY_OP_OSPEED	193
+#define SSH2_TTY_OP_ISPEED	128
+#define SSH2_TTY_OP_OSPEED	129
+
+/* Helper functions for parsing tty-related config. */
+static unsigned int ssh_tty_parse_specchar(char *s)
+{
+    unsigned int ret;
+    if (*s) {
+	char *next = NULL;
+	ret = ctrlparse(s, &next);
+	if (!next) ret = s[0];
+    } else {
+	ret = 255; /* special value meaning "don't set" */
+    }
+    return ret;
+}
+static unsigned int ssh_tty_parse_boolean(char *s)
+{
+    if (stricmp(s, "yes") == 0 ||
+	stricmp(s, "on") == 0 ||
+	stricmp(s, "true") == 0 ||
+	stricmp(s, "+") == 0)
+	return 1; /* true */
+    else if (stricmp(s, "no") == 0 ||
+	     stricmp(s, "off") == 0 ||
+	     stricmp(s, "false") == 0 ||
+	     stricmp(s, "-") == 0)
+	return 0; /* false */
+    else
+	return (atoi(s) != 0);
+}
+
 #define translate(x) if (type == x) return #x
 #define translatec(x,ctx) if (type == x && (pkt_ctx & ctx)) return #x
 static char *ssh1_pkt_type(int type)
@@ -256,18 +360,6 @@ static char *ssh2_pkt_type(int pkt_ctx, int type)
 #undef translate
 #undef translatec
 
-#define GET_32BIT(cp) \
-    (((unsigned long)(unsigned char)(cp)[0] << 24) | \
-    ((unsigned long)(unsigned char)(cp)[1] << 16) | \
-    ((unsigned long)(unsigned char)(cp)[2] << 8) | \
-    ((unsigned long)(unsigned char)(cp)[3]))
-
-#define PUT_32BIT(cp, value) { \
-    (cp)[0] = (unsigned char)((value) >> 24); \
-    (cp)[1] = (unsigned char)((value) >> 16); \
-    (cp)[2] = (unsigned char)((value) >> 8); \
-    (cp)[3] = (unsigned char)(value); }
-
 /* Enumeration values for fields in SSH-1 packets */
 enum {
     PKT_END, PKT_INT, PKT_CHAR, PKT_DATA, PKT_STR, PKT_BIGNUM,
@@ -319,14 +411,19 @@ enum {
 typedef struct ssh_tag *Ssh;
 struct Packet;
 
+static struct Packet *ssh1_pkt_init(int pkt_type);
 static struct Packet *ssh2_pkt_init(int pkt_type);
+static void ssh_pkt_ensure(struct Packet *, int length);
+static void ssh_pkt_adddata(struct Packet *, void *data, int len);
+static void ssh_pkt_addbyte(struct Packet *, unsigned char value);
 static void ssh2_pkt_addbool(struct Packet *, unsigned char value);
-static void ssh2_pkt_adduint32(struct Packet *, unsigned long value);
-static void ssh2_pkt_addstring_start(struct Packet *);
-static void ssh2_pkt_addstring_str(struct Packet *, char *data);
-static void ssh2_pkt_addstring_data(struct Packet *, char *data, int len);
-static void ssh2_pkt_addstring(struct Packet *, char *data);
+static void ssh_pkt_adduint32(struct Packet *, unsigned long value);
+static void ssh_pkt_addstring_start(struct Packet *);
+static void ssh_pkt_addstring_str(struct Packet *, char *data);
+static void ssh_pkt_addstring_data(struct Packet *, char *data, int len);
+static void ssh_pkt_addstring(struct Packet *, char *data);
 static unsigned char *ssh2_mpint_fmt(Bignum b, int *len);
+static void ssh1_pkt_addmp(struct Packet *, Bignum b);
 static void ssh2_pkt_addmp(struct Packet *, Bignum b);
 static int ssh2_pkt_construct(Ssh, struct Packet *);
 static void ssh2_pkt_send(Ssh, struct Packet *);
@@ -364,34 +461,11 @@ static void do_ssh2_authconn(Ssh ssh, unsigned char *in, int inlen,
 
 const static struct ssh_signkey *hostkey_algs[] = { &ssh_rsa, &ssh_dss };
 
-static void *nullmac_make_context(void)
-{
-    return NULL;
-}
-static void nullmac_free_context(void *handle)
-{
-}
-static void nullmac_key(void *handle, unsigned char *key)
-{
-}
-static void nullmac_generate(void *handle, unsigned char *blk, int len,
-			     unsigned long seq)
-{
-}
-static int nullmac_verify(void *handle, unsigned char *blk, int len,
-			  unsigned long seq)
-{
-    return 1;
-}
-const static struct ssh_mac ssh_mac_none = {
-    nullmac_make_context, nullmac_free_context, nullmac_key,
-    nullmac_generate, nullmac_verify, "none", 0
-};
 const static struct ssh_mac *macs[] = {
-    &ssh_sha1, &ssh_md5, &ssh_mac_none
+    &ssh_sha1, &ssh_md5
 };
 const static struct ssh_mac *buggymacs[] = {
-    &ssh_sha1_buggy, &ssh_md5, &ssh_mac_none
+    &ssh_sha1_buggy, &ssh_md5
 };
 
 static void *ssh_comp_none_init(void)
@@ -534,15 +608,15 @@ struct ssh_portfwd {
 	     sfree((pf)->sserv), sfree((pf)->dserv)) : (void)0 ), sfree(pf) )
 
 struct Packet {
-    long length;
-    long forcepad; /* Force padding to at least this length */
-    int type;
-    unsigned long sequence;
-    unsigned char *data;
-    unsigned char *body;
-    long savedpos;
-    long maxlen;
-    long encrypted_len;		       /* for SSH-2 total-size counting */
+    long length;	    /* length of `data' actually used */
+    long forcepad;	    /* SSH-2: force padding to at least this length */
+    int type;		    /* only used for incoming packets */
+    unsigned long sequence; /* SSH-2 incoming sequence number */
+    unsigned char *data;    /* allocated storage */
+    unsigned char *body;    /* offset of payload within `data' */
+    long savedpos;	    /* temporary index into `data' (for strings) */
+    long maxlen;	    /* amount of storage allocated for `data' */
+    long encrypted_len;	    /* for SSH-2 total-size counting */
 
     /*
      * State associated with packet logging
@@ -815,6 +889,29 @@ static void end_log_omission(Ssh ssh, struct Packet *pkt)
     pkt->logmode = PKTLOG_EMIT;
 }
 
+/* Helper function for common bits of parsing cfg.ttymodes. */
+static void parse_ttymodes(Ssh ssh, char *modes,
+			   void (*do_mode)(void *data, char *mode, char *val),
+			   void *data)
+{
+    while (*modes) {
+	char *t = strchr(modes, '\t');
+	char *m = snewn(t-modes+1, char);
+	char *val;
+	strncpy(m, modes, t-modes);
+	m[t-modes] = '\0';
+	if (*(t+1) == 'A')
+	    val = get_ttymode(ssh->frontend, m);
+	else
+	    val = dupstr(t+2);
+	if (val)
+	    do_mode(data, m, val);
+	sfree(m);
+	sfree(val);
+	modes += strlen(modes) + 1;
+    }
+}
+
 static int ssh_channelcmp(void *av, void *bv)
 {
     struct ssh_channel *a = (struct ssh_channel *) av;
@@ -982,7 +1079,7 @@ static struct Packet *ssh_new_packet(void)
 {
     struct Packet *pkt = snew(struct Packet);
 
-    pkt->data = NULL;
+    pkt->body = pkt->data = NULL;
     pkt->maxlen = 0;
     pkt->logmode = PKTLOG_EMIT;
     pkt->nblanks = 0;
@@ -1282,36 +1379,9 @@ static struct Packet *ssh2_rdpkt(Ssh ssh, unsigned char **data, int *datalen)
     crFinish(st->pktin);
 }
 
-static void ssh1_pktout_size(struct Packet *pkt, int len)
-{
-    int pad, biglen;
-
-    len += 5;			       /* type and CRC */
-    pad = 8 - (len % 8);
-    biglen = len + pad;
-
-    pkt->length = len - 5;
-    if (pkt->maxlen < biglen) {
-	pkt->maxlen = biglen;
-	pkt->data = sresize(pkt->data, biglen + 4 + APIEXTRA, unsigned char);
-    }
-    pkt->body = pkt->data + 4 + pad + 1;
-}
-
-static struct Packet *s_wrpkt_start(int type, int len)
-{
-    struct Packet *pkt = ssh_new_packet();
-    ssh1_pktout_size(pkt, len);
-    pkt->type = type;
-    /* Initialise log omission state */
-    pkt->nblanks = 0;
-    pkt->blanks = NULL;
-    return pkt;
-}
-
-static int s_wrpkt_prepare(Ssh ssh, struct Packet *pkt)
+static int s_wrpkt_prepare(Ssh ssh, struct Packet *pkt, int *offset_p)
 {
-    int pad, biglen, i;
+    int pad, biglen, i, pktoffs;
     unsigned long crc;
 #ifdef __SC__
     /*
@@ -1324,12 +1394,10 @@ static int s_wrpkt_prepare(Ssh ssh, struct Packet *pkt)
 #endif
     int len;
 
-    pkt->body[-1] = pkt->type;
-
     if (ssh->logctx)
-	log_packet(ssh->logctx, PKT_OUTGOING, pkt->type,
-		   ssh1_pkt_type(pkt->type),
-		   pkt->body, pkt->length,
+	log_packet(ssh->logctx, PKT_OUTGOING, pkt->data[12],
+		   ssh1_pkt_type(pkt->data[12]),
+		   pkt->body, pkt->length - (pkt->body - pkt->data),
 		   pkt->nblanks, pkt->blanks);
     sfree(pkt->blanks); pkt->blanks = NULL;
     pkt->nblanks = 0;
@@ -1338,132 +1406,99 @@ static int s_wrpkt_prepare(Ssh ssh, struct Packet *pkt)
 	unsigned char *compblk;
 	int complen;
 	zlib_compress_block(ssh->cs_comp_ctx,
-			    pkt->body - 1, pkt->length + 1,
+			    pkt->data + 12, pkt->length - 12,
 			    &compblk, &complen);
-	ssh1_pktout_size(pkt, complen - 1);
-	memcpy(pkt->body - 1, compblk, complen);
+	memcpy(pkt->data + 12, compblk, complen);
 	sfree(compblk);
+	pkt->length = complen + 12;
     }
 
-    len = pkt->length + 5;	       /* type and CRC */
+    ssh_pkt_ensure(pkt, pkt->length + 4); /* space for CRC */
+    pkt->length += 4;
+    len = pkt->length - 4 - 8;	/* len(type+data+CRC) */
     pad = 8 - (len % 8);
-    biglen = len + pad;
+    pktoffs = 8 - pad;
+    biglen = len + pad;		/* len(padding+type+data+CRC) */
 
-    for (i = 0; i < pad; i++)
-	pkt->data[i + 4] = random_byte();
-    crc = crc32_compute(pkt->data + 4, biglen - 4);
-    PUT_32BIT(pkt->data + biglen, crc);
-    PUT_32BIT(pkt->data, len);
+    for (i = pktoffs; i < 4+8; i++)
+	pkt->data[i] = random_byte();
+    crc = crc32_compute(pkt->data + pktoffs + 4, biglen - 4); /* all ex len */
+    PUT_32BIT(pkt->data + pktoffs + 4 + biglen - 4, crc);
+    PUT_32BIT(pkt->data + pktoffs, len);
 
     if (ssh->cipher)
-	ssh->cipher->encrypt(ssh->v1_cipher_ctx, pkt->data + 4, biglen);
+	ssh->cipher->encrypt(ssh->v1_cipher_ctx,
+			     pkt->data + pktoffs + 4, biglen);
 
-    return biglen + 4;
+    if (offset_p) *offset_p = pktoffs;
+    return biglen + 4;		/* len(length+padding+type+data+CRC) */
 }
 
 static void s_wrpkt(Ssh ssh, struct Packet *pkt)
 {
-    int len, backlog;
-    len = s_wrpkt_prepare(ssh, pkt);
-    backlog = sk_write(ssh->s, (char *)pkt->data, len);
+    int len, backlog, offset;
+    len = s_wrpkt_prepare(ssh, pkt, &offset);
+    backlog = sk_write(ssh->s, (char *)pkt->data + offset, len);
     if (backlog > SSH_MAX_BACKLOG)
 	ssh_throttle_all(ssh, 1, backlog);
+    ssh_free_packet(pkt);
 }
 
 static void s_wrpkt_defer(Ssh ssh, struct Packet *pkt)
 {
-    int len;
-    len = s_wrpkt_prepare(ssh, pkt);
+    int len, offset;
+    len = s_wrpkt_prepare(ssh, pkt, &offset);
     if (ssh->deferred_len + len > ssh->deferred_size) {
 	ssh->deferred_size = ssh->deferred_len + len + 128;
 	ssh->deferred_send_data = sresize(ssh->deferred_send_data,
 					  ssh->deferred_size,
 					  unsigned char);
     }
-    memcpy(ssh->deferred_send_data + ssh->deferred_len, pkt->data, len);
+    memcpy(ssh->deferred_send_data + ssh->deferred_len,
+	   pkt->data + offset, len);
     ssh->deferred_len += len;
+    ssh_free_packet(pkt);
 }
 
 /*
- * Construct a packet with the specified contents.
+ * Construct a SSH-1 packet with the specified contents.
+ * (This all-at-once interface used to be the only one, but now SSH-1
+ * packets can also be constructed incrementally.)
  */
-static struct Packet *construct_packet(Ssh ssh, int pkttype,
-				       va_list ap1, va_list ap2)
+static struct Packet *construct_packet(Ssh ssh, int pkttype, va_list ap)
 {
-    unsigned char *p, *argp, argchar;
-    unsigned long argint;
-    int pktlen, argtype, arglen;
+    int argtype;
     Bignum bn;
     struct Packet *pkt;
 
-    pktlen = 0;
-    while ((argtype = va_arg(ap1, int)) != PKT_END) {
-	switch (argtype) {
-	  case PKT_INT:
-	    (void) va_arg(ap1, int);
-	    pktlen += 4;
-	    break;
-	  case PKT_CHAR:
-	    (void) va_arg(ap1, int);
-	    pktlen++;
-	    break;
-	  case PKT_DATA:
-	    (void) va_arg(ap1, unsigned char *);
-	    arglen = va_arg(ap1, int);
-	    pktlen += arglen;
-	    break;
-	  case PKT_STR:
-	    argp = va_arg(ap1, unsigned char *);
-	    arglen = strlen((char *)argp);
-	    pktlen += 4 + arglen;
-	    break;
-	  case PKT_BIGNUM:
-	    bn = va_arg(ap1, Bignum);
-	    pktlen += ssh1_bignum_length(bn);
-	    break;
-	  case PKTT_PASSWORD:
-	  case PKTT_DATA:
-	  case PKTT_OTHER:
-	    /* ignore this pass */
-	    break;
-	  default:
-	    assert(0);
-	}
-    }
-
-    pkt = s_wrpkt_start(pkttype, pktlen);
-    p = pkt->body;
+    pkt = ssh1_pkt_init(pkttype);
 
-    while ((argtype = va_arg(ap2, int)) != PKT_END) {
-	int offset = p - pkt->body, len = 0;
+    while ((argtype = va_arg(ap, int)) != PKT_END) {
+	unsigned char *argp, argchar;
+	unsigned long argint;
+	int arglen;
 	switch (argtype) {
 	  /* Actual fields in the packet */
 	  case PKT_INT:
-	    argint = va_arg(ap2, int);
-	    PUT_32BIT(p, argint);
-	    len = 4;
+	    argint = va_arg(ap, int);
+	    ssh_pkt_adduint32(pkt, argint);
 	    break;
 	  case PKT_CHAR:
-	    argchar = (unsigned char) va_arg(ap2, int);
-	    *p = argchar;
-	    len = 1;
+	    argchar = (unsigned char) va_arg(ap, int);
+	    ssh_pkt_addbyte(pkt, argchar);
 	    break;
 	  case PKT_DATA:
-	    argp = va_arg(ap2, unsigned char *);
-	    arglen = va_arg(ap2, int);
-	    memcpy(p, argp, arglen);
-	    len = arglen;
+	    argp = va_arg(ap, unsigned char *);
+	    arglen = va_arg(ap, int);
+	    ssh_pkt_adddata(pkt, argp, arglen);
 	    break;
 	  case PKT_STR:
-	    argp = va_arg(ap2, unsigned char *);
-	    arglen = strlen((char *)argp);
-	    PUT_32BIT(p, arglen);
-	    memcpy(p + 4, argp, arglen);
-	    len = arglen + 4;
+	    argp = va_arg(ap, unsigned char *);
+	    ssh_pkt_addstring(pkt, argp);
 	    break;
 	  case PKT_BIGNUM:
-	    bn = va_arg(ap2, Bignum);
-	    len = ssh1_write_bignum(p, bn);
+	    bn = va_arg(ap, Bignum);
+	    ssh1_pkt_addmp(pkt, bn);
 	    break;
 	  /* Tokens for modifications to packet logging */
 	  case PKTT_PASSWORD:
@@ -1476,16 +1511,6 @@ static struct Packet *construct_packet(Ssh ssh, int pkttype,
 	    end_log_omission(ssh, pkt);
 	    break;
 	}
-	p += len;
-	/* Deal with logfile omission, if required. */
-	if (len && (pkt->logmode != PKTLOG_EMIT)) {
-	    pkt->nblanks++;
-	    pkt->blanks = sresize(pkt->blanks, pkt->nblanks,
-				  struct logblank_t);
-	    pkt->blanks[pkt->nblanks-1].offset = offset;
-	    pkt->blanks[pkt->nblanks-1].len    = len;
-	    pkt->blanks[pkt->nblanks-1].type   = pkt->logmode;
-	}
     }
 
     return pkt;
@@ -1494,27 +1519,21 @@ static struct Packet *construct_packet(Ssh ssh, int pkttype,
 static void send_packet(Ssh ssh, int pkttype, ...)
 {
     struct Packet *pkt;
-    va_list ap1, ap2;
-    va_start(ap1, pkttype);
-    va_start(ap2, pkttype);
-    pkt = construct_packet(ssh, pkttype, ap1, ap2);
-    va_end(ap2);
-    va_end(ap1);
+    va_list ap;
+    va_start(ap, pkttype);
+    pkt = construct_packet(ssh, pkttype, ap);
+    va_end(ap);
     s_wrpkt(ssh, pkt);
-    ssh_free_packet(pkt);
 }
 
 static void defer_packet(Ssh ssh, int pkttype, ...)
 {
     struct Packet *pkt;
-    va_list ap1, ap2;
-    va_start(ap1, pkttype);
-    va_start(ap2, pkttype);
-    pkt = construct_packet(ssh, pkttype, ap1, ap2);
-    va_end(ap2);
-    va_end(ap1);
+    va_list ap;
+    va_start(ap, pkttype);
+    pkt = construct_packet(ssh, pkttype, ap);
+    va_end(ap);
     s_wrpkt_defer(ssh, pkt);
-    ssh_free_packet(pkt);
 }
 
 static int ssh_versioncmp(char *a, char *b)
@@ -1541,7 +1560,6 @@ static int ssh_versioncmp(char *a, char *b)
  * Utility routines for putting an SSH-protocol `string' and
  * `uint32' into a SHA state.
  */
-#include <stdio.h>
 static void sha_string(SHA_State * s, void *str, int len)
 {
     unsigned char lenblk[4];
@@ -1558,69 +1576,74 @@ static void sha_uint32(SHA_State * s, unsigned i)
 }
 
 /*
- * SSH-2 packet construction functions.
+ * Packet construction functions. Mostly shared between SSH-1 and SSH-2.
  */
-static void ssh2_pkt_ensure(struct Packet *pkt, int length)
+static void ssh_pkt_ensure(struct Packet *pkt, int length)
 {
     if (pkt->maxlen < length) {
+	unsigned char *body = pkt->body;
+	int offset = body ? pkt->data - body : 0;
 	pkt->maxlen = length + 256;
 	pkt->data = sresize(pkt->data, pkt->maxlen + APIEXTRA, unsigned char);
+	if (body) pkt->body = pkt->data + offset;
     }
 }
-static void ssh2_pkt_adddata(struct Packet *pkt, void *data, int len)
+static void ssh_pkt_adddata(struct Packet *pkt, void *data, int len)
 {
     if (pkt->logmode != PKTLOG_EMIT) {
 	pkt->nblanks++;
 	pkt->blanks = sresize(pkt->blanks, pkt->nblanks, struct logblank_t);
-	pkt->blanks[pkt->nblanks-1].offset = pkt->length - 6;
+	assert(pkt->body);
+	pkt->blanks[pkt->nblanks-1].offset = pkt->length -
+					     (pkt->body - pkt->data);
 	pkt->blanks[pkt->nblanks-1].len = len;
 	pkt->blanks[pkt->nblanks-1].type = pkt->logmode;
     }
     pkt->length += len;
-    ssh2_pkt_ensure(pkt, pkt->length);
+    ssh_pkt_ensure(pkt, pkt->length);
     memcpy(pkt->data + pkt->length - len, data, len);
 }
-static void ssh2_pkt_addbyte(struct Packet *pkt, unsigned char byte)
+static void ssh_pkt_addbyte(struct Packet *pkt, unsigned char byte)
 {
-    ssh2_pkt_adddata(pkt, &byte, 1);
-}
-static struct Packet *ssh2_pkt_init(int pkt_type)
-{
-    struct Packet *pkt = ssh_new_packet();
-    pkt->length = 5;
-    pkt->forcepad = 0;
-    ssh2_pkt_addbyte(pkt, (unsigned char) pkt_type);
-    return pkt;
+    ssh_pkt_adddata(pkt, &byte, 1);
 }
 static void ssh2_pkt_addbool(struct Packet *pkt, unsigned char value)
 {
-    ssh2_pkt_adddata(pkt, &value, 1);
+    ssh_pkt_adddata(pkt, &value, 1);
 }
-static void ssh2_pkt_adduint32(struct Packet *pkt, unsigned long value)
+static void ssh_pkt_adduint32(struct Packet *pkt, unsigned long value)
 {
     unsigned char x[4];
     PUT_32BIT(x, value);
-    ssh2_pkt_adddata(pkt, x, 4);
+    ssh_pkt_adddata(pkt, x, 4);
 }
-static void ssh2_pkt_addstring_start(struct Packet *pkt)
+static void ssh_pkt_addstring_start(struct Packet *pkt)
 {
-    ssh2_pkt_adduint32(pkt, 0);
+    ssh_pkt_adduint32(pkt, 0);
     pkt->savedpos = pkt->length;
 }
-static void ssh2_pkt_addstring_str(struct Packet *pkt, char *data)
+static void ssh_pkt_addstring_str(struct Packet *pkt, char *data)
 {
-    ssh2_pkt_adddata(pkt, data, strlen(data));
+    ssh_pkt_adddata(pkt, data, strlen(data));
     PUT_32BIT(pkt->data + pkt->savedpos - 4, pkt->length - pkt->savedpos);
 }
-static void ssh2_pkt_addstring_data(struct Packet *pkt, char *data, int len)
+static void ssh_pkt_addstring_data(struct Packet *pkt, char *data, int len)
 {
-    ssh2_pkt_adddata(pkt, data, len);
+    ssh_pkt_adddata(pkt, data, len);
     PUT_32BIT(pkt->data + pkt->savedpos - 4, pkt->length - pkt->savedpos);
 }
-static void ssh2_pkt_addstring(struct Packet *pkt, char *data)
+static void ssh_pkt_addstring(struct Packet *pkt, char *data)
 {
-    ssh2_pkt_addstring_start(pkt);
-    ssh2_pkt_addstring_str(pkt, data);
+    ssh_pkt_addstring_start(pkt);
+    ssh_pkt_addstring_str(pkt, data);
+}
+static void ssh1_pkt_addmp(struct Packet *pkt, Bignum b)
+{
+    int len = ssh1_bignum_length(b);
+    unsigned char *data = snewn(len, char);
+    (void) ssh1_write_bignum(data, b);
+    ssh_pkt_adddata(pkt, data, len);
+    sfree(data);
 }
 static unsigned char *ssh2_mpint_fmt(Bignum b, int *len)
 {
@@ -1644,11 +1667,40 @@ static void ssh2_pkt_addmp(struct Packet *pkt, Bignum b)
     unsigned char *p;
     int len;
     p = ssh2_mpint_fmt(b, &len);
-    ssh2_pkt_addstring_start(pkt);
-    ssh2_pkt_addstring_data(pkt, (char *)p, len);
+    ssh_pkt_addstring_start(pkt);
+    ssh_pkt_addstring_data(pkt, (char *)p, len);
     sfree(p);
 }
 
+static struct Packet *ssh1_pkt_init(int pkt_type)
+{
+    struct Packet *pkt = ssh_new_packet();
+    pkt->length = 4 + 8;	    /* space for length + max padding */
+    ssh_pkt_addbyte(pkt, pkt_type);
+    pkt->body = pkt->data + pkt->length;
+    return pkt;
+}
+
+/* For legacy code (SSH-1 and -2 packet construction used to be separate) */
+#define ssh2_pkt_ensure(pkt, length) ssh_pkt_ensure(pkt, length)
+#define ssh2_pkt_adddata(pkt, data, len) ssh_pkt_adddata(pkt, data, len)
+#define ssh2_pkt_addbyte(pkt, byte) ssh_pkt_addbyte(pkt, byte)
+#define ssh2_pkt_adduint32(pkt, value) ssh_pkt_adduint32(pkt, value)
+#define ssh2_pkt_addstring_start(pkt) ssh_pkt_addstring_start(pkt)
+#define ssh2_pkt_addstring_str(pkt, data) ssh_pkt_addstring_str(pkt, data)
+#define ssh2_pkt_addstring_data(pkt, data, len) ssh_pkt_addstring_data(pkt, data, len)
+#define ssh2_pkt_addstring(pkt, data) ssh_pkt_addstring(pkt, data)
+
+static struct Packet *ssh2_pkt_init(int pkt_type)
+{
+    struct Packet *pkt = ssh_new_packet();
+    pkt->length = 5;
+    pkt->forcepad = 0;
+    ssh_pkt_addbyte(pkt, (unsigned char) pkt_type);
+    pkt->body = pkt->data + pkt->length;
+    return pkt;
+}
+
 /*
  * Construct an SSH-2 final-form packet: compress it, encrypt it,
  * put the MAC on it. Final packet, ready to be sent, is stored in
@@ -1661,7 +1713,7 @@ static int ssh2_pkt_construct(Ssh ssh, struct Packet *pkt)
     if (ssh->logctx)
 	log_packet(ssh->logctx, PKT_OUTGOING, pkt->data[5],
 		   ssh2_pkt_type(ssh->pkt_ctx, pkt->data[5]),
-		   pkt->data + 6, pkt->length - 6,
+		   pkt->body, pkt->length - (pkt->body - pkt->data),
 		   pkt->nblanks, pkt->blanks);
     sfree(pkt->blanks); pkt->blanks = NULL;
     pkt->nblanks = 0;
@@ -1745,8 +1797,19 @@ static int ssh2_pkt_construct(Ssh ssh, struct Packet *pkt)
  * ssh2_pkt_send() or ssh2_pkt_defer() either go straight to one of
  * these or get queued, and then when the queue is later emptied
  * the packets are all passed to defer_noqueue().
+ *
+ * When using a CBC-mode cipher, it's necessary to ensure that an
+ * attacker can't provide data to be encrypted using an IV that they
+ * know.  We ensure this by prefixing each packet that might contain
+ * user data with an SSH_MSG_IGNORE.  This is done using the deferral
+ * mechanism, so in this case send_noqueue() ends up redirecting to
+ * defer_noqueue().  If you don't like this inefficiency, don't use
+ * CBC.
  */
 
+static void ssh2_pkt_defer_noqueue(Ssh, struct Packet *, int);
+static void ssh_pkt_defersend(Ssh);
+
 /*
  * Send an SSH-2 packet immediately, without queuing or deferring.
  */
@@ -1754,6 +1817,12 @@ static void ssh2_pkt_send_noqueue(Ssh ssh, struct Packet *pkt)
 {
     int len;
     int backlog;
+    if (ssh->cscipher != NULL && (ssh->cscipher->flags & SSH_CIPHER_IS_CBC)) {
+	/* We need to send two packets, so use the deferral mechanism. */
+	ssh2_pkt_defer_noqueue(ssh, pkt, FALSE);
+	ssh_pkt_defersend(ssh);
+	return;
+    }
     len = ssh2_pkt_construct(ssh, pkt);
     backlog = sk_write(ssh->s, (char *)pkt->data, len);
     if (backlog > SSH_MAX_BACKLOG)
@@ -1771,9 +1840,19 @@ static void ssh2_pkt_send_noqueue(Ssh ssh, struct Packet *pkt)
 /*
  * Defer an SSH-2 packet.
  */
-static void ssh2_pkt_defer_noqueue(Ssh ssh, struct Packet *pkt)
+static void ssh2_pkt_defer_noqueue(Ssh ssh, struct Packet *pkt, int noignore)
 {
-    int len = ssh2_pkt_construct(ssh, pkt);
+    int len;
+    if (ssh->cscipher != NULL && (ssh->cscipher->flags & SSH_CIPHER_IS_CBC) &&
+	ssh->deferred_len == 0 && !noignore) {
+	/*
+	 * Interpose an SSH_MSG_IGNORE to ensure that user data don't
+	 * get encrypted with a known IV.
+	 */
+	struct Packet *ipkt = ssh2_pkt_init(SSH2_MSG_IGNORE);
+	ssh2_pkt_defer_noqueue(ssh, ipkt, TRUE);
+    }
+    len = ssh2_pkt_construct(ssh, pkt);
     if (ssh->deferred_len + len > ssh->deferred_size) {
 	ssh->deferred_size = ssh->deferred_len + len + 128;
 	ssh->deferred_send_data = sresize(ssh->deferred_send_data,
@@ -1823,7 +1902,7 @@ static void ssh2_pkt_defer(Ssh ssh, struct Packet *pkt)
     if (ssh->queueing)
 	ssh2_pkt_queue(ssh, pkt);
     else
-	ssh2_pkt_defer_noqueue(ssh, pkt);
+	ssh2_pkt_defer_noqueue(ssh, pkt, FALSE);
 }
 #endif
 
@@ -1871,7 +1950,7 @@ static void ssh2_pkt_queuesend(Ssh ssh)
     assert(!ssh->queueing);
 
     for (i = 0; i < ssh->queuelen; i++)
-	ssh2_pkt_defer_noqueue(ssh, ssh->queue[i]);
+	ssh2_pkt_defer_noqueue(ssh, ssh->queue[i], FALSE);
     ssh->queuelen = 0;
 
     ssh_pkt_defersend(ssh);
@@ -2112,7 +2191,7 @@ static void ssh_detect_bugs(Ssh ssh, char *vstring)
 	 * an AUTH_RSA message.
 	 */
 	ssh->remote_bugs |= BUG_CHOKES_ON_RSA;
-	logevent("We believe remote version can't handle RSA authentication");
+	logevent("We believe remote version can't handle SSH-1 RSA authentication");
     }
 
     if (ssh->cfg.sshbug_hmac2 == FORCE_ON ||
@@ -2331,6 +2410,8 @@ static int do_ssh_init(Ssh ssh, unsigned char c)
                   strcspn(verstring, "\015\012"), verstring);
 	sk_write(ssh->s, verstring, strlen(verstring));
         sfree(verstring);
+	if (ssh->version == 2)
+	    do_ssh2_transport(ssh, NULL, -1, NULL);
     }
 
     logeventf(ssh, "Using SSH protocol version %d", ssh->version);
@@ -2444,6 +2525,7 @@ static int ssh_do_close(Ssh ssh, int notify_exit)
     struct ssh_channel *c;
 
     ssh->state = SSH_STATE_CLOSED;
+    expire_timer_context(ssh);
     if (ssh->s) {
         sk_close(ssh->s);
         ssh->s = NULL;
@@ -4485,6 +4567,27 @@ static void ssh1_smsg_exit_status(Ssh ssh, struct Packet *pktin)
     ssh_closing((Plug)ssh, NULL, 0, 0);
 }
 
+/* Helper function to deal with sending tty modes for REQUEST_PTY */
+static void ssh1_send_ttymode(void *data, char *mode, char *val)
+{
+    struct Packet *pktout = (struct Packet *)data;
+    int i = 0;
+    unsigned int arg = 0;
+    while (strcmp(mode, ssh_ttymodes[i].mode) != 0) i++;
+    if (i == lenof(ssh_ttymodes)) return;
+    switch (ssh_ttymodes[i].type) {
+      case TTY_OP_CHAR:
+	arg = ssh_tty_parse_specchar(val);
+	break;
+      case TTY_OP_BOOL:
+	arg = ssh_tty_parse_boolean(val);
+	break;
+    }
+    ssh2_pkt_addbyte(pktout, ssh_ttymodes[i].opcode);
+    ssh2_pkt_addbyte(pktout, arg);
+}
+
+
 static void do_ssh1_connection(Ssh ssh, unsigned char *in, int inlen,
 			       struct Packet *pktin)
 {
@@ -4529,14 +4632,23 @@ static void do_ssh1_connection(Ssh ssh, unsigned char *in, int inlen,
 	ssh->x11auth = x11_invent_auth(proto, sizeof(proto),
 				       data, sizeof(data), ssh->cfg.x11_auth);
         x11_get_real_auth(ssh->x11auth, ssh->cfg.x11_display);
+	/*
+	 * Note that while we blank the X authentication data here, we don't
+	 * take any special action to blank the start of an X11 channel,
+	 * so using MIT-MAGIC-COOKIE-1 and actually opening an X connection
+	 * without having session blanking enabled is likely to leak your
+	 * cookie into the log.
+	 */
 	if (ssh->v1_local_protoflags & SSH1_PROTOFLAG_SCREEN_NUMBER) {
 	    send_packet(ssh, SSH1_CMSG_X11_REQUEST_FORWARDING,
-			PKT_STR, proto, PKT_STR, data,
+			PKT_STR, proto,
+			PKTT_PASSWORD, PKT_STR, data, PKTT_OTHER,
 			PKT_INT, x11_get_screen_number(ssh->cfg.x11_display),
 			PKT_END);
 	} else {
 	    send_packet(ssh, SSH1_CMSG_X11_REQUEST_FORWARDING,
-			PKT_STR, proto, PKT_STR, data, PKT_END);
+			PKT_STR, proto,
+			PKTT_PASSWORD, PKT_STR, data, PKTT_OTHER, PKT_END);
 	}
 	do {
 	    crReturnV;
@@ -4558,19 +4670,26 @@ static void do_ssh1_connection(Ssh ssh, unsigned char *in, int inlen,
     ssh->packet_dispatch[SSH1_MSG_PORT_OPEN] = ssh1_msg_port_open;
 
     if (!ssh->cfg.nopty) {
+	struct Packet *pkt;
 	/* Unpick the terminal-speed string. */
 	/* XXX perhaps we should allow no speeds to be sent. */
 	ssh->ospeed = 38400; ssh->ispeed = 38400; /* last-resort defaults */
 	sscanf(ssh->cfg.termspeed, "%d,%d", &ssh->ospeed, &ssh->ispeed);
 	/* Send the pty request. */
-	send_packet(ssh, SSH1_CMSG_REQUEST_PTY,
-		    PKT_STR, ssh->cfg.termtype,
-		    PKT_INT, ssh->term_height,
-		    PKT_INT, ssh->term_width,
-		    PKT_INT, 0, PKT_INT, 0, /* width,height in pixels */
-		    PKT_CHAR, 192, PKT_INT, ssh->ispeed, /* TTY_OP_ISPEED */
-		    PKT_CHAR, 193, PKT_INT, ssh->ospeed, /* TTY_OP_OSPEED */
-		    PKT_CHAR, 0, PKT_END);
+	pkt = ssh1_pkt_init(SSH1_CMSG_REQUEST_PTY);
+	ssh_pkt_addstring(pkt, ssh->cfg.termtype);
+	ssh_pkt_adduint32(pkt, ssh->term_height);
+	ssh_pkt_adduint32(pkt, ssh->term_width);
+	ssh_pkt_adduint32(pkt, 0); /* width in pixels */
+	ssh_pkt_adduint32(pkt, 0); /* height in pixels */
+	parse_ttymodes(ssh, ssh->cfg.ttymodes,
+		       ssh1_send_ttymode, (void *)pkt);
+	ssh_pkt_addbyte(pkt, SSH1_TTY_OP_ISPEED);
+	ssh_pkt_adduint32(pkt, ssh->ispeed);
+	ssh_pkt_addbyte(pkt, SSH1_TTY_OP_OSPEED);
+	ssh_pkt_adduint32(pkt, ssh->ospeed);
+	ssh_pkt_addbyte(pkt, SSH_TTY_OP_END);
+	s_wrpkt(ssh, pkt);
 	ssh->state = SSH_STATE_INTERMED;
 	do {
 	    crReturnV;
@@ -4926,6 +5045,9 @@ static int do_ssh2_transport(Ssh ssh, void *vin, int inlen,
 	      case CIPHER_AES:
 		s->preferred_ciphers[s->n_preferred_ciphers++] = &ssh2_aes;
 		break;
+	      case CIPHER_ARCFOUR:
+		s->preferred_ciphers[s->n_preferred_ciphers++] = &ssh2_arcfour;
+		break;
 	      case CIPHER_WARN:
 		/* Flag for later. Don't bother if it's the last in
 		 * the list. */
@@ -5677,6 +5799,32 @@ static int ssh2_try_send(struct ssh_channel *c)
     return bufchain_size(&c->v.v2.outbuffer);
 }
 
+static void ssh2_try_send_and_unthrottle(struct ssh_channel *c)
+{
+    int bufsize;
+    if (c->closes)
+	return;			       /* don't send on closing channels */
+    bufsize = ssh2_try_send(c);
+    if (bufsize == 0) {
+	switch (c->type) {
+	  case CHAN_MAINSESSION:
+	    /* stdin need not receive an unthrottle
+	     * notification since it will be polled */
+	    break;
+	  case CHAN_X11:
+	    x11_unthrottle(c->u.x11.s);
+	    break;
+	  case CHAN_AGENT:
+	    /* agent sockets are request/response and need no
+	     * buffer management */
+	    break;
+	  case CHAN_SOCKDATA:
+	    pfd_unthrottle(c->u.pfd.s);
+	    break;
+	}
+    }
+}
+
 /*
  * Potentially enlarge the window on an SSH-2 channel.
  */
@@ -5715,8 +5863,10 @@ static void ssh2_msg_channel_window_adjust(Ssh ssh, struct Packet *pktin)
     unsigned i = ssh_pkt_getuint32(pktin);
     struct ssh_channel *c;
     c = find234(ssh->channels, &i, ssh_channelfind);
-    if (c && !c->closes)
+    if (c && !c->closes) {
 	c->v.v2.remwindow += ssh_pkt_getuint32(pktin);
+	ssh2_try_send_and_unthrottle(c);
+    }
 }
 
 static void ssh2_msg_channel_data(Ssh ssh, struct Packet *pktin)
@@ -6237,6 +6387,26 @@ static void ssh2_msg_channel_open(Ssh ssh, struct Packet *pktin)
     }
 }
 
+/* Helper function to deal with sending tty modes for "pty-req" */
+static void ssh2_send_ttymode(void *data, char *mode, char *val)
+{
+    struct Packet *pktout = (struct Packet *)data;
+    int i = 0;
+    unsigned int arg = 0;
+    while (strcmp(mode, ssh_ttymodes[i].mode) != 0) i++;
+    if (i == lenof(ssh_ttymodes)) return;
+    switch (ssh_ttymodes[i].type) {
+      case TTY_OP_CHAR:
+	arg = ssh_tty_parse_specchar(val);
+	break;
+      case TTY_OP_BOOL:
+	arg = ssh_tty_parse_boolean(val);
+	break;
+    }
+    ssh2_pkt_addbyte(pktout, ssh_ttymodes[i].opcode);
+    ssh2_pkt_adduint32(pktout, arg);
+}
+
 /*
  * Handle the SSH-2 userauth and connection layers.
  */
@@ -6258,6 +6428,7 @@ static void do_ssh2_authconn(Ssh ssh, unsigned char *in, int inlen,
 		AUTH_TYPE_KEYBOARD_INTERACTIVE,
 		AUTH_TYPE_KEYBOARD_INTERACTIVE_QUIET
 	} type;
+	int done_service_req;
 	int gotit, need_pw, can_pubkey, can_passwd, can_keyb_inter;
 	int tried_pubkey_config, tried_agent;
 	int kbd_inter_running, kbd_inter_refused;
@@ -6285,16 +6456,33 @@ static void do_ssh2_authconn(Ssh ssh, unsigned char *in, int inlen,
 
     crBegin(ssh->do_ssh2_authconn_crstate);
 
-    /*
-     * Request userauth protocol, and await a response to it.
-     */
-    s->pktout = ssh2_pkt_init(SSH2_MSG_SERVICE_REQUEST);
-    ssh2_pkt_addstring(s->pktout, "ssh-userauth");
-    ssh2_pkt_send(ssh, s->pktout);
-    crWaitUntilV(pktin);
-    if (pktin->type != SSH2_MSG_SERVICE_ACCEPT) {
-	bombout(("Server refused user authentication protocol"));
-	crStopV;
+    s->done_service_req = FALSE;
+    s->we_are_in = FALSE;
+    if (!ssh->cfg.ssh_no_userauth) {
+	/*
+	 * Request userauth protocol, and await a response to it.
+	 */
+	s->pktout = ssh2_pkt_init(SSH2_MSG_SERVICE_REQUEST);
+	ssh2_pkt_addstring(s->pktout, "ssh-userauth");
+	ssh2_pkt_send(ssh, s->pktout);
+	crWaitUntilV(pktin);
+	if (pktin->type == SSH2_MSG_SERVICE_ACCEPT)
+	    s->done_service_req = TRUE;
+    }
+    if (!s->done_service_req) {
+	/*
+	 * Request connection protocol directly, without authentication.
+	 */
+	s->pktout = ssh2_pkt_init(SSH2_MSG_SERVICE_REQUEST);
+	ssh2_pkt_addstring(s->pktout, "ssh-connection");
+	ssh2_pkt_send(ssh, s->pktout);
+	crWaitUntilV(pktin);
+	if (pktin->type == SSH2_MSG_SERVICE_ACCEPT) {
+	    s->we_are_in = TRUE; /* no auth required */
+	} else {
+	    bombout(("Server refused service request"));
+	    crStopV;
+	}
     }
 
     /*
@@ -6323,7 +6511,7 @@ static void do_ssh2_authconn(Ssh ssh, unsigned char *in, int inlen,
      */
     s->username[0] = '\0';
     s->got_username = FALSE;
-    do {
+    while (!s->we_are_in) {
 	/*
 	 * Get a username.
 	 */
@@ -7064,12 +7252,10 @@ static void do_ssh2_authconn(Ssh ssh, unsigned char *in, int inlen,
 		crStopV;
 	    }
 	}
-    } while (!s->we_are_in);
+    }
 
     /*
-     * Now we're authenticated for the connection protocol. The
-     * connection protocol will automatically have started at this
-     * point; there's no need to send SERVICE_REQUEST.
+     * Now the connection protocol has started, one way or another.
      */
 
     ssh->channels = newtree234(ssh_channelcmp);
@@ -7153,7 +7339,16 @@ static void do_ssh2_authconn(Ssh ssh, unsigned char *in, int inlen,
 	ssh2_pkt_addbool(s->pktout, 1);	       /* want reply */
 	ssh2_pkt_addbool(s->pktout, 0);	       /* many connections */
 	ssh2_pkt_addstring(s->pktout, proto);
+	/*
+	 * Note that while we blank the X authentication data here, we don't
+	 * take any special action to blank the start of an X11 channel,
+	 * so using MIT-MAGIC-COOKIE-1 and actually opening an X connection
+	 * without having session blanking enabled is likely to leak your
+	 * cookie into the log.
+	 */
+	dont_log_password(ssh, s->pktout, PKTLOG_BLANK);
 	ssh2_pkt_addstring(s->pktout, data);
+	end_log_omission(ssh, s->pktout);
 	ssh2_pkt_adduint32(s->pktout, x11_get_screen_number(ssh->cfg.x11_display));
 	ssh2_pkt_send(ssh, s->pktout);
 
@@ -7222,9 +7417,11 @@ static void do_ssh2_authconn(Ssh ssh, unsigned char *in, int inlen,
 	ssh2_pkt_adduint32(s->pktout, 0);	       /* pixel width */
 	ssh2_pkt_adduint32(s->pktout, 0);	       /* pixel height */
 	ssh2_pkt_addstring_start(s->pktout);
-	ssh2_pkt_addbyte(s->pktout, 128);	       /* TTY_OP_ISPEED */
+	parse_ttymodes(ssh, ssh->cfg.ttymodes,
+		       ssh2_send_ttymode, (void *)s->pktout);
+	ssh2_pkt_addbyte(s->pktout, SSH2_TTY_OP_ISPEED);
 	ssh2_pkt_adduint32(s->pktout, ssh->ispeed);
-	ssh2_pkt_addbyte(s->pktout, 129);	       /* TTY_OP_OSPEED */
+	ssh2_pkt_addbyte(s->pktout, SSH2_TTY_OP_OSPEED);
 	ssh2_pkt_adduint32(s->pktout, ssh->ospeed);
 	ssh2_pkt_addstring_data(s->pktout, "\0", 1); /* TTY_OP_END */
 	ssh2_pkt_send(ssh, s->pktout);
@@ -7414,30 +7611,8 @@ static void do_ssh2_authconn(Ssh ssh, unsigned char *in, int inlen,
 	    /*
 	     * Try to send data on all channels if we can.
 	     */
-	    for (i = 0; NULL != (c = index234(ssh->channels, i)); i++) {
-		int bufsize;
-		if (c->closes)
-		    continue;	       /* don't send on closing channels */
-		bufsize = ssh2_try_send(c);
-		if (bufsize == 0) {
-		    switch (c->type) {
-		      case CHAN_MAINSESSION:
-			/* stdin need not receive an unthrottle
-			 * notification since it will be polled */
-			break;
-		      case CHAN_X11:
-			x11_unthrottle(c->u.x11.s);
-			break;
-		      case CHAN_AGENT:
-			/* agent sockets are request/response and need no
-			 * buffer management */
-			break;
-		      case CHAN_SOCKDATA:
-			pfd_unthrottle(c->u.pfd.s);
-			break;
-		    }
-		}
-	    }
+	    for (i = 0; NULL != (c = index234(ssh->channels, i)); i++)
+		ssh2_try_send_and_unthrottle(c);
 	}
     }
 
@@ -7565,6 +7740,9 @@ static void ssh2_timer(void *ctx, long now)
 {
     Ssh ssh = (Ssh)ctx;
 
+    if (ssh->state == SSH_STATE_CLOSED)
+	return;
+
     if (!ssh->kex_in_progress && ssh->cfg.ssh_rekey_time != 0 &&
 	now - ssh->next_rekey >= 0) {
 	do_ssh2_transport(ssh, "timeout", -1, NULL);
@@ -8049,6 +8227,7 @@ static void ssh_special(void *handle, Telnet_Special code)
 	    struct Packet *pktout = ssh2_pkt_init(SSH2_MSG_CHANNEL_EOF);
 	    ssh2_pkt_adduint32(pktout, ssh->mainchan->remoteid);
 	    ssh2_pkt_send(ssh, pktout);
+            ssh->send_ok = 0;          /* now stop trying to read from stdin */
 	}
 	logevent("Sent EOF message");
     } else if (code == TS_PING || code == TS_NOP) {