Merge pull request #49 from fperrad/20170812_lint

Some linting, const parameters

agentfwd.h

@@ -40,8 +40,8 @@
 /* client functions */
 void cli_load_agent_keys(m_list * ret_list);
 void agent_buf_sign(buffer *sigblob, sign_key *key, 
-	buffer *data_buf);
-void cli_setup_agent(struct Channel *channel);
+	const buffer *data_buf);
+void cli_setup_agent(const struct Channel *channel);
 #ifdef __hpux
 #define seteuid(a)       setresuid(-1, (a), -1)
@@ -56,7 +56,7 @@ extern const struct ChanType cli_chan_agent;
 int svr_agentreq(struct ChanSess * chansess);
 void svr_agentcleanup(struct ChanSess * chansess);
-void svr_agentset(struct ChanSess *chansess);
+void svr_agentset(const struct ChanSess *chansess);
 #endif /* DROPBEAR_SVR_AGENTFWD */

algo.h

@@ -112,8 +112,8 @@ struct dropbear_kex {
 	const struct ltc_hash_descriptor *hash_desc;
 };
-int have_algo(char* algo, size_t algolen, algo_type algos[]);
-void buf_put_algolist(buffer * buf, algo_type localalgos[]);
+int have_algo(const char* algo, size_t algolen, const algo_type algos[]);
+void buf_put_algolist(buffer * buf, const algo_type localalgos[]);
 enum kexguess2_used {
 	KEXGUESS2_LOOK,
@@ -131,7 +131,7 @@ algo_type * buf_match_algo(buffer* buf, algo_type localalgos[],
 #if DROPBEAR_USER_ALGO_LIST
 int check_user_algos(const char* user_algo_list, algo_type * algos, 
 		const char *algo_desc);
-char * algolist_string(algo_type algos[]);
+char * algolist_string(const algo_type algos[]);
 #endif
 enum {

auth.h

@@ -36,7 +36,7 @@ void cli_authinitialise(void);
 void recv_msg_userauth_request(void);
 void send_msg_userauth_failure(int partial, int incrfail);
 void send_msg_userauth_success(void);
-void send_msg_userauth_banner(buffer *msg);
+void send_msg_userauth_banner(const buffer *msg);
 void svr_auth_password(void);
 void svr_auth_pubkey(void);
 void svr_auth_pam(void);
@@ -74,7 +74,7 @@ void cli_pubkeyfail(void);
 void cli_auth_password(void);
 int cli_auth_pubkey(void);
 void cli_auth_interactive(void);
-char* getpass_or_cancel(char* prompt);
+char* getpass_or_cancel(const char* prompt);
 void cli_auth_pubkey_cleanup(void);

buffer.c

@@ -67,7 +67,7 @@ void buf_free(buffer* buf) {
 }
 /* overwrite the contents of the buffer to clear it */
-void buf_burn(buffer* buf) {
+void buf_burn(const buffer* buf) {
 	
 	m_burn(buf->data, buf->size);
@@ -91,7 +91,7 @@ buffer* buf_resize(buffer *buf, unsigned int newsize) {
 /* Create a copy of buf, allocating required memory etc. */
 /* The new buffer is sized the same as the length of the source buffer. */
-buffer* buf_newcopy(buffer* buf) {
+buffer* buf_newcopy(const buffer* buf) {
 	
 	buffer* ret;
@@ -184,7 +184,7 @@ void buf_putbyte(buffer* buf, unsigned char val) {
 /* returns an in-place pointer to the buffer, checking that
  * the next len bytes from that position can be used */
-unsigned char* buf_getptr(buffer* buf, unsigned int len) {
+unsigned char* buf_getptr(const buffer* buf, unsigned int len) {
 	if (len > BUF_MAX_INCR || buf->pos + len > buf->len) {
 		dropbear_exit("Bad buf_getptr");
@@ -194,7 +194,7 @@ unsigned char* buf_getptr(buffer* buf, unsigned int len) {
 /* like buf_getptr, but checks against total size, not used length.
  * This allows writing past the used length, but not past the size */
-unsigned char* buf_getwriteptr(buffer* buf, unsigned int len) {
+unsigned char* buf_getwriteptr(const buffer* buf, unsigned int len) {
 	if (len > BUF_MAX_INCR || buf->pos + len > buf->size) {
 		dropbear_exit("Bad buf_getwriteptr");

buffer.h

@@ -44,8 +44,8 @@ buffer * buf_new(unsigned int size);
 /* Possibly returns a new buffer*, like realloc() */
 buffer * buf_resize(buffer *buf, unsigned int newsize);
 void buf_free(buffer* buf);
-void buf_burn(buffer* buf);
-buffer* buf_newcopy(buffer* buf);
+void buf_burn(const buffer* buf);
+buffer* buf_newcopy(const buffer* buf);
 void buf_setlen(buffer* buf, unsigned int len);
 void buf_incrlen(buffer* buf, unsigned int incr);
 void buf_setpos(buffer* buf, unsigned int pos);
@@ -54,8 +54,8 @@ void buf_incrwritepos(buffer* buf, unsigned int incr);
 unsigned char buf_getbyte(buffer* buf);
 unsigned char buf_getbool(buffer* buf);
 void buf_putbyte(buffer* buf, unsigned char val);
-unsigned char* buf_getptr(buffer* buf, unsigned int len);
-unsigned char* buf_getwriteptr(buffer* buf, unsigned int len);
+unsigned char* buf_getptr(const buffer* buf, unsigned int len);
+unsigned char* buf_getwriteptr(const buffer* buf, unsigned int len);
 char* buf_getstring(buffer* buf, unsigned int *retlen);
 buffer * buf_getstringbuf(buffer *buf);
 void buf_eatstring(buffer *buf);

channel.h

@@ -84,7 +84,7 @@ struct Channel {
 	int flushing;
 	/* Used by client chansession to handle ~ escaping, NULL ignored otherwise */
-	void (*read_mangler)(struct Channel*, unsigned char* bytes, int *len);
+	void (*read_mangler)(const struct Channel*, const unsigned char* bytes, int *len);
 	const struct ChanType* type;
@@ -98,7 +98,7 @@ struct ChanType {
 	int (*inithandler)(struct Channel*);
 	int (*check_close)(struct Channel*);
 	void (*reqhandler)(struct Channel*);
-	void (*closehandler)(struct Channel*);
+	void (*closehandler)(const struct Channel*);
 };
 /* Callback for connect_remote */
@@ -107,7 +107,7 @@ void channel_connect_done(int result, int sock, void* user_data, const char* err
 void chaninitialise(const struct ChanType *chantypes[]);
 void chancleanup(void);
 void setchannelfds(fd_set *readfds, fd_set *writefds, int allow_reads);
-void channelio(fd_set *readfd, fd_set *writefd);
+void channelio(const fd_set *readfd, const fd_set *writefd);
 struct Channel* getchannel(void);
 /* Returns an arbitrary channel that is in a ready state - not
 being initialised and no EOF in either direction. NULL if none. */
@@ -115,8 +115,8 @@ struct Channel* get_any_ready_channel(void);
 void recv_msg_channel_open(void);
 void recv_msg_channel_request(void);
-void send_msg_channel_failure(struct Channel *channel);
-void send_msg_channel_success(struct Channel *channel);
+void send_msg_channel_failure(const struct Channel *channel);
+void send_msg_channel_success(const struct Channel *channel);
 void recv_msg_channel_data(void);
 void recv_msg_channel_extended_data(void);
 void recv_msg_channel_window_adjust(void);
@@ -135,7 +135,7 @@ int send_msg_channel_open_init(int fd, const struct ChanType *type);
 void recv_msg_channel_open_confirmation(void);
 void recv_msg_channel_open_failure(void);
 #endif
-void start_send_channel_request(struct Channel *channel, char *type);
+void start_send_channel_request(const struct Channel *channel, const char *type);
 void send_msg_request_success(void);
 void send_msg_request_failure(void);

circbuffer.c

@@ -56,19 +56,19 @@ void cbuf_free(circbuffer * cbuf) {
 	m_free(cbuf);
 }
-unsigned int cbuf_getused(circbuffer * cbuf) {
+unsigned int cbuf_getused(const circbuffer * cbuf) {
 	return cbuf->used;
 }
-unsigned int cbuf_getavail(circbuffer * cbuf) {
+unsigned int cbuf_getavail(const circbuffer * cbuf) {
 	return cbuf->size - cbuf->used;
 }
-unsigned int cbuf_writelen(circbuffer *cbuf) {
+unsigned int cbuf_writelen(const circbuffer *cbuf) {
 	dropbear_assert(cbuf->used <= cbuf->size);
 	dropbear_assert(((2*cbuf->size)+cbuf->writepos-cbuf->readpos)%cbuf->size == cbuf->used%cbuf->size);
@@ -86,7 +86,7 @@ unsigned int cbuf_writelen(circbuffer *cbuf) {
 	return cbuf->size - cbuf->writepos;
 }
-void cbuf_readptrs(circbuffer *cbuf, 
+void cbuf_readptrs(const circbuffer *cbuf,
 	unsigned char **p1, unsigned int *len1, 
 	unsigned char **p2, unsigned int *len2) {
 	*p1 = &cbuf->data[cbuf->readpos];

circbuffer.h

@@ -38,12 +38,12 @@ typedef struct circbuf circbuffer;
 circbuffer * cbuf_new(unsigned int size);
 void cbuf_free(circbuffer * cbuf);
-unsigned int cbuf_getused(circbuffer * cbuf); /* how much data stored */
-unsigned int cbuf_getavail(circbuffer * cbuf); /* how much we can write */
-unsigned int cbuf_writelen(circbuffer *cbuf); /* max linear write len */
+unsigned int cbuf_getused(const circbuffer * cbuf); /* how much data stored */
+unsigned int cbuf_getavail(const circbuffer * cbuf); /* how much we can write */
+unsigned int cbuf_writelen(const circbuffer *cbuf); /* max linear write len */
 /* returns pointers to the two portions of the circular buffer that can be read */
-void cbuf_readptrs(circbuffer *cbuf, 
+void cbuf_readptrs(const circbuffer *cbuf,
 	unsigned char **p1, unsigned int *len1, 
 	unsigned char **p2, unsigned int *len2);
 unsigned char* cbuf_writeptr(circbuffer *cbuf, unsigned int len);

cli-agentfwd.c

@@ -108,7 +108,7 @@ static int new_agent_chan(struct Channel * channel) {
    data        Any data, depending on packet type.  Encoding as in the ssh packet
                protocol.
 */
-static buffer * agent_request(unsigned char type, buffer *data) {
+static buffer * agent_request(unsigned char type, const buffer *data) {
 	buffer * payload = NULL;
 	buffer * inbuf = NULL;
@@ -230,7 +230,7 @@ out:
 	}
 }
-void cli_setup_agent(struct Channel *channel) {
+void cli_setup_agent(const struct Channel *channel) {
 	if (!getenv("SSH_AUTH_SOCK")) {
 		return;
 	}
@@ -254,7 +254,7 @@ void cli_load_agent_keys(m_list *ret_list) {
 }
 void agent_buf_sign(buffer *sigblob, sign_key *key, 
-		buffer *data_buf) {
+		const buffer *data_buf) {
 	buffer *request_data = NULL;
 	buffer *response = NULL;
 	unsigned int siglen;

cli-auth.c

@@ -331,7 +331,7 @@ int cli_auth_try() {
 #if DROPBEAR_CLI_PASSWORD_AUTH || DROPBEAR_CLI_INTERACT_AUTH
 /* A helper for getpass() that exits if the user cancels. The returned
  * password is statically allocated by getpass() */
-char* getpass_or_cancel(char* prompt)
+char* getpass_or_cancel(const char* prompt)
 {
 	char* password = NULL;
 	

cli-authpubkey.c

@@ -121,7 +121,7 @@ void recv_msg_userauth_pk_ok() {
 }
 void cli_buf_put_sign(buffer* buf, sign_key *key, int type, 
-			buffer *data_buf) {
+			const buffer *data_buf) {
 #if DROPBEAR_CLI_AGENTFWD
 	if (key->source == SIGNKEY_SOURCE_AGENT) {
 		/* Format the agent signature ourselves, as buf_put_sign would. */

cli-chansession.c

@@ -35,12 +35,12 @@
 #include "chansession.h"
 #include "agentfwd.h"
-static void cli_closechansess(struct Channel *channel);
+static void cli_closechansess(const struct Channel *channel);
 static int cli_initchansess(struct Channel *channel);
 static void cli_chansessreq(struct Channel *channel);
-static void send_chansess_pty_req(struct Channel *channel);
-static void send_chansess_shell_req(struct Channel *channel);
-static void cli_escape_handler(struct Channel *channel, unsigned char* buf, int *len);
+static void send_chansess_pty_req(const struct Channel *channel);
+static void send_chansess_shell_req(const struct Channel *channel);
+static void cli_escape_handler(const struct Channel *channel, const unsigned char* buf, int *len);
 static int cli_init_netcat(struct Channel *channel);
 static void cli_tty_setup(void);
@@ -83,7 +83,7 @@ out:
 	
 /* If the main session goes, we close it up */
-static void cli_closechansess(struct Channel *UNUSED(channel)) {
+static void cli_closechansess(const struct Channel *UNUSED(channel)) {
 	cli_tty_cleanup(); /* Restore tty modes etc */
 	/* This channel hasn't gone yet, so we have > 1 */
@@ -270,7 +270,7 @@ void cli_chansess_winchange() {
 	cli_ses.winchange = 0;
 }
-static void send_chansess_pty_req(struct Channel *channel) {
+static void send_chansess_pty_req(const struct Channel *channel) {
 	char* term = NULL;
@@ -303,7 +303,7 @@ static void send_chansess_pty_req(struct Channel *channel) {
 	TRACE(("leave send_chansess_pty_req"))
 }
-static void send_chansess_shell_req(struct Channel *channel) {
+static void send_chansess_shell_req(const struct Channel *channel) {
 	char* reqtype = NULL;
@@ -452,7 +452,7 @@ do_escape(unsigned char c) {
 }
 static
-void cli_escape_handler(struct Channel* UNUSED(channel), unsigned char* buf, int *len) {
+void cli_escape_handler(const struct Channel* UNUSED(channel), const unsigned char* buf, int *len) {
 	char c;
 	int skip_char = 0;

cli-kex.c

@@ -39,7 +39,7 @@
 #include "ecc.h"
-static void checkhostkey(unsigned char* keyblob, unsigned int keybloblen);
+static void checkhostkey(const unsigned char* keyblob, unsigned int keybloblen);
 #define MAX_KNOWNHOSTS_LINE 4500
 void send_msg_kexdh_init() {
@@ -185,7 +185,7 @@ void recv_msg_kexdh_reply() {
 	TRACE(("leave recv_msg_kexdh_init"))
 }
-static void ask_to_confirm(unsigned char* keyblob, unsigned int keybloblen,
+static void ask_to_confirm(const unsigned char* keyblob, unsigned int keybloblen,
 	const char* algoname) {
 	char* fp = NULL;
@@ -282,7 +282,7 @@ out:
 	return hostsfile;
 }
-static void checkhostkey(unsigned char* keyblob, unsigned int keybloblen) {
+static void checkhostkey(const unsigned char* keyblob, unsigned int keybloblen) {
 	FILE *hostsfile = NULL;
 	int readonly = 0;

cli-main.c

@@ -142,7 +142,7 @@ static void cli_dropbear_log(int priority,
 	fflush(stderr);
 }
-static void exec_proxy_cmd(void *user_data_cmd) {
+static void exec_proxy_cmd(const void *user_data_cmd) {
 	const char *cmd = user_data_cmd;
 	char *usershell;

common-algo.c

@@ -314,7 +314,7 @@ algo_type sshkex[] = {
  * against.
  * Returns DROPBEAR_SUCCESS if we have a match for algo, DROPBEAR_FAILURE
  * otherwise */
-int have_algo(char* algo, size_t algolen, algo_type algos[]) {
+int have_algo(const char* algo, size_t algolen, const algo_type algos[]) {
 	int i;
@@ -329,7 +329,7 @@ int have_algo(char* algo, size_t algolen, algo_type algos[]) {
 }
 /* Output a comma separated list of algorithms to a buffer */
-void buf_put_algolist(buffer * buf, algo_type localalgos[]) {
+void buf_put_algolist(buffer * buf, const algo_type localalgos[]) {
 	unsigned int i, len;
 	unsigned int donefirst = 0;
@@ -501,7 +501,7 @@ get_algo_usable(algo_type algos[], const char * algo_name)
 #if DROPBEAR_USER_ALGO_LIST
 char *
-algolist_string(algo_type algos[])
+algolist_string(const algo_type algos[])
 {
 	char *ret_list;
 	buffer *b = buf_new(200);

common-channel.c

@@ -38,18 +38,18 @@
 static void send_msg_channel_open_failure(unsigned int remotechan, int reason,
 		const char *text, const char *lang);
-static void send_msg_channel_open_confirmation(struct Channel* channel,
+static void send_msg_channel_open_confirmation(const struct Channel* channel,
 		unsigned int recvwindow, 
 		unsigned int recvmaxpacket);
 static int writechannel(struct Channel* channel, int fd, circbuffer *cbuf,
 	const unsigned char *moredata, unsigned int *morelen);
-static void send_msg_channel_window_adjust(struct Channel *channel, 
+static void send_msg_channel_window_adjust(const struct Channel *channel,
 		unsigned int incr);
 static void send_msg_channel_data(struct Channel *channel, int isextended);
 static void send_msg_channel_eof(struct Channel *channel);
 static void send_msg_channel_close(struct Channel *channel);
 static void remove_channel(struct Channel *channel);
-static unsigned int write_pending(struct Channel * channel);
+static unsigned int write_pending(const struct Channel * channel);
 static void check_close(struct Channel *channel);
 static void close_chan_fd(struct Channel *channel, int fd, int how);
@@ -198,7 +198,7 @@ struct Channel* getchannel() {
 }
 /* Iterate through the channels, performing IO if available */
-void channelio(fd_set *readfds, fd_set *writefds) {
+void channelio(const fd_set *readfds, const fd_set *writefds) {
 	/* Listeners such as TCP, X11, agent-auth */
 	struct Channel *channel;
@@ -262,7 +262,7 @@ void channelio(fd_set *readfds, fd_set *writefds) {
 /* Returns true if there is data remaining to be written to stdin or
  * stderr of a channel's endpoint. */
-static unsigned int write_pending(struct Channel * channel) {
+static unsigned int write_pending(const struct Channel * channel) {
 	if (channel->writefd >= 0 && cbuf_getused(channel->writebuf) > 0) {
 		return 1;
@@ -903,7 +903,7 @@ void recv_msg_channel_window_adjust() {
 /* Increment the incoming data window for a channel, and let the remote
  * end know */
-static void send_msg_channel_window_adjust(struct Channel* channel, 
+static void send_msg_channel_window_adjust(const struct Channel* channel,
 		unsigned int incr) {
 	TRACE(("sending window adjust %d", incr))
@@ -1008,7 +1008,7 @@ cleanup:
 }
 /* Send a failure message */
-void send_msg_channel_failure(struct Channel *channel) {
+void send_msg_channel_failure(const struct Channel *channel) {
 	TRACE(("enter send_msg_channel_failure"))
 	CHECKCLEARTOWRITE();
@@ -1021,7 +1021,7 @@ void send_msg_channel_failure(struct Channel *channel) {
 }
 /* Send a success message */
-void send_msg_channel_success(struct Channel *channel) {
+void send_msg_channel_success(const struct Channel *channel) {
 	TRACE(("enter send_msg_channel_success"))
 	CHECKCLEARTOWRITE();
@@ -1053,7 +1053,7 @@ static void send_msg_channel_open_failure(unsigned int remotechan,
 /* Confirm a channel open, and let the remote end know what number we've
  * allocated and the receive parameters */
-static void send_msg_channel_open_confirmation(struct Channel* channel,
+static void send_msg_channel_open_confirmation(const struct Channel* channel,
 		unsigned int recvwindow, 
 		unsigned int recvmaxpacket) {
@@ -1239,8 +1239,8 @@ struct Channel* get_any_ready_channel() {
 	return NULL;
 }
-void start_send_channel_request(struct Channel *channel, 
-		char *type) {
+void start_send_channel_request(const struct Channel *channel,
+		const char *type) {
 	CHECKCLEARTOWRITE();
 	buf_putbyte(ses.writepayload, SSH_MSG_CHANNEL_REQUEST);

common-kex.c

@@ -714,7 +714,7 @@ void free_kexcurve25519_param(struct kex_curve25519_param *param)
 	m_free(param);
 }
-void kexcurve25519_comb_key(struct kex_curve25519_param *param, buffer *buf_pub_them,
+void kexcurve25519_comb_key(const struct kex_curve25519_param *param, const buffer *buf_pub_them,
 	sign_key *hostkey) {
 	unsigned char out[CURVE25519_LEN];
 	const unsigned char* Q_C = NULL;

dbrandom.c

@@ -141,7 +141,7 @@ out:
 	return ret;
 }
-void addrandom(unsigned char * buf, unsigned int len)
+void addrandom(const unsigned char * buf, unsigned int len)
 {
 	hash_state hs;

dbrandom.h

@@ -29,7 +29,7 @@
 void seedrandom(void);
 void genrandom(unsigned char* buf, unsigned int len);
-void addrandom(unsigned char * buf, unsigned int len);
+void addrandom(const unsigned char * buf, unsigned int len);
 void gen_random_mpint(mp_int *max, mp_int *rand);
 #endif /* DROPBEAR_RANDOM_H_ */

dbutil.c

@@ -241,7 +241,7 @@ int connect_unix(const char* path) {
  * it will be run after the child has fork()ed, and is passed exec_data.
  * If ret_errfd == NULL then stderr will not be captured.
  * ret_pid can be passed as  NULL to discard the pid. */
-int spawn_command(void(*exec_fn)(void *user_data), void *exec_data,
+int spawn_command(void(*exec_fn)(const void *user_data), const void *exec_data,
 		int *ret_writefd, int *ret_readfd, int *ret_errfd, pid_t *ret_pid) {
 	int infds[2];
 	int outfds[2];