dropbear/common-runopts.c

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/*
* Dropbear - a SSH2 server
*
* Copyright (c) 2002,2003 Matt Johnston
* All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE. */
#include "includes.h"
#include "runopts.h"
#include "signkey.h"
#include "buffer.h"
#include "dbutil.h"
#include "auth.h"
#include "algo.h"
#include "dbrandom.h"
runopts opts; /* GLOBAL */
/* returns success or failure, and the keytype in *type. If we want
* to restrict the type, type can contain a type to return */
int readhostkey(const char * filename, sign_key * hostkey,
enum signkey_type *type) {
int ret = DROPBEAR_FAILURE;
buffer *buf;
buf = buf_new(MAX_PRIVKEY_SIZE);
if (buf_readfile(buf, filename) == DROPBEAR_FAILURE) {
goto out;
}
buf_setpos(buf, 0);
addrandom(buf_getptr(buf, buf->len), buf->len);
if (buf_get_priv_key(buf, hostkey, type) == DROPBEAR_FAILURE) {
goto out;
}
ret = DROPBEAR_SUCCESS;
out:
buf_burn_free(buf);
return ret;
}
#if DROPBEAR_USER_ALGO_LIST
void
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parse_ciphers_macs() {
int printed_help = 0;
if (opts.cipher_list) {
if (strcmp(opts.cipher_list, "help") == 0) {
char *ciphers = algolist_string(sshciphers);
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dropbear_log(LOG_INFO, "Available ciphers: %s", ciphers);
m_free(ciphers);
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printed_help = 1;
} else {
if (check_user_algos(opts.cipher_list, sshciphers, "cipher") == 0) {
dropbear_exit("No valid ciphers specified for '-c'");
}
}
}
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if (opts.mac_list) {
if (strcmp(opts.mac_list, "help") == 0) {
char *macs = algolist_string(sshhashes);
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dropbear_log(LOG_INFO, "Available MACs: %s", macs);
m_free(macs);
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printed_help = 1;
} else {
if (check_user_algos(opts.mac_list, sshhashes, "MAC") == 0) {
dropbear_exit("No valid MACs specified for '-m'");
}
}
}
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if (printed_help) {
dropbear_exit(".");
}
}
#endif
void print_version() {
fprintf(stderr, "Dropbear v%s\n", DROPBEAR_VERSION);
}
void parse_recv_window(const char* recv_window_arg) {
int ret;
unsigned int rw;
ret = m_str_to_uint(recv_window_arg, &rw);
if (ret == DROPBEAR_FAILURE || rw == 0 || rw > MAX_RECV_WINDOW) {
if (rw > MAX_RECV_WINDOW) {
opts.recv_window = MAX_RECV_WINDOW;
}
dropbear_log(LOG_WARNING, "Bad recv window '%s', using %d",
recv_window_arg, opts.recv_window);
} else {
opts.recv_window = rw;
}
}
/* Splits addr:port. Handles IPv6 [2001:0011::4]:port style format.
Returns first/second parts as malloced strings, second will
be NULL if no separator is found.
:port -> (NULL, "port")
port -> (port, NULL)
addr:port (addr, port)
addr: -> (addr, "")
Returns DROPBEAR_SUCCESS/DROPBEAR_FAILURE */
int split_address_port(const char* spec, char **first, char ** second) {
char *spec_copy = NULL, *addr = NULL, *colon = NULL;
int ret = DROPBEAR_FAILURE;
*first = NULL;
*second = NULL;
spec_copy = m_strdup(spec);
addr = spec_copy;
if (*addr == '[') {
addr++;
colon = strchr(addr, ']');
if (!colon) {
dropbear_log(LOG_WARNING, "Bad address '%s'", spec);
goto out;
}
*colon = '\0';
colon++;
if (*colon == '\0') {
/* No port part */
colon = NULL;
} else if (*colon != ':') {
dropbear_log(LOG_WARNING, "Bad address '%s'", spec);
goto out;
}
} else {
/* search for ':', that separates address and port */
colon = strrchr(addr, ':');
}
/* colon points to ':' now, or is NULL */
if (colon) {
/* Split the address/port */
*colon = '\0';
colon++;
*second = m_strdup(colon);
}
if (strlen(addr)) {
*first = m_strdup(addr);
}
ret = DROPBEAR_SUCCESS;
out:
m_free(spec_copy);
return ret;
}