ttyopts: make non-POSIX defines optional

This file uses a bunch of defines that, while common, are not in POSIX.
https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/termios.h.html

Add more ifdef checks around them to fix building on platforms that omit
them.

Signed-off-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Jakub Jelen <jjelen@redhat.com>

src/libcrypto.c

@@ -406,7 +406,7 @@ static void evp_cipher_init(struct ssh_cipher_struct *cipher)
     if (cipher->ctx == NULL) {
         cipher->ctx = EVP_CIPHER_CTX_new();
     } else {
-        EVP_CIPHER_CTX_init(cipher->ctx);
+        EVP_CIPHER_CTX_reset(cipher->ctx);
     }
 
     switch(cipher->ciphertype){

src/ttyopts.c

@@ -172,12 +172,18 @@ baud2speed(int baudrate)
         return 19200;
     case B38400:
         return 38400;
+#ifdef B57600
     case B57600:
         return 57600;
+#endif
+#ifdef B115200
     case B115200:
         return 115200;
+#endif
+#ifdef B230400
     case B230400:
         return 230400;
+#endif
     }
 }
 
@@ -222,7 +228,9 @@ encode_termios_opts(struct termios *attr, unsigned char *buf, size_t buflen)
     SSH_ENCODE_INPUT_OPT(IXON)
     SSH_ENCODE_INPUT_OPT(IXANY)
     SSH_ENCODE_INPUT_OPT(IXOFF)
+#ifdef IMAXBEL
     SSH_ENCODE_INPUT_OPT(IMAXBEL)
+#endif
 #ifdef IUTF8
     SSH_ENCODE_INPUT_OPT(IUTF8)
 #endif
@@ -262,8 +270,12 @@ encode_termios_opts(struct termios *attr, unsigned char *buf, size_t buflen)
     SSH_ENCODE_LOCAL_OPT(NOFLSH)
     SSH_ENCODE_LOCAL_OPT(TOSTOP)
     SSH_ENCODE_LOCAL_OPT(IEXTEN)
+#ifdef ECHOCTL
     SSH_ENCODE_LOCAL_OPT(ECHOCTL)
+#endif
+#ifdef ECHOKE
     SSH_ENCODE_LOCAL_OPT(ECHOKE)
+#endif
 #ifdef PENDIN
     SSH_ENCODE_LOCAL_OPT(PENDIN)
 #endif
@@ -276,16 +288,24 @@ encode_termios_opts(struct termios *attr, unsigned char *buf, size_t buflen)
     SSH_ENCODE_CC_OPT(VKILL)
     SSH_ENCODE_CC_OPT(VEOF)
     SSH_ENCODE_CC_OPT(VEOL)
+#ifdef VEOL2
     SSH_ENCODE_CC_OPT(VEOL2)
+#endif
     SSH_ENCODE_CC_OPT(VSTART)
     SSH_ENCODE_CC_OPT(VSTOP)
     SSH_ENCODE_CC_OPT(VSUSP)
 #ifdef VDSUSP
     SSH_ENCODE_CC_OPT(VDSUSP)
 #endif
+#ifdef VREPRINT
     SSH_ENCODE_CC_OPT(VREPRINT)
+#endif
+#ifdef VWERASE
     SSH_ENCODE_CC_OPT(VWERASE)
+#endif
+#ifdef VLNEXT
     SSH_ENCODE_CC_OPT(VLNEXT)
+#endif
 #ifdef VFLUSH
     SSH_ENCODE_CC_OPT(VFLUSH)
 #endif
@@ -295,7 +315,9 @@ encode_termios_opts(struct termios *attr, unsigned char *buf, size_t buflen)
 #ifdef VSTATUS
     SSH_ENCODE_CC_OPT(VSTATUS)
 #endif
+#ifdef VDISCARD
     SSH_ENCODE_CC_OPT(VDISCARD)
+#endif
 #undef SSH_ENCODE_CC_OPT
 
     SSH_ENCODE_OPT(TTY_OP_ISPEED, baud2speed(cfgetispeed(attr)))