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putty/cmdline.c

571 строка
16 KiB
C
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/*
* cmdline.c - command-line parsing shared between many of the
* PuTTY applications
*/
#include <stdio.h>
#include <assert.h>
#include <stdlib.h>
#include "putty.h"
/*
* Some command-line parameters need to be saved up until after
* we've loaded the saved session which will form the basis of our
* eventual running configuration. For this we use the macro
* SAVEABLE, which notices if the `need_save' parameter is set and
* saves the parameter and value on a list.
*
* We also assign priorities to saved parameters, just to slightly
* ameliorate silly ordering problems. For example, if you specify
* a saved session to load, it will be loaded _before_ all your
* local modifications such as -L are evaluated; and if you specify
* a protocol and a port, the protocol is set up first so that the
* port can override its choice of port number.
*
* (In fact -load is not saved at all, since in at least Plink the
* processing of further command-line options depends on whether or
* not the loaded session contained a hostname. So it must be
* executed immediately.)
*/
#define NPRIORITIES 2
struct cmdline_saved_param {
char *p, *value;
};
struct cmdline_saved_param_set {
struct cmdline_saved_param *params;
int nsaved, savesize;
};
/*
* C guarantees this structure will be initialised to all zero at
* program start, which is exactly what we want.
*/
static struct cmdline_saved_param_set saves[NPRIORITIES];
static void cmdline_save_param(char *p, char *value, int pri)
{
if (saves[pri].nsaved >= saves[pri].savesize) {
saves[pri].savesize = saves[pri].nsaved + 32;
saves[pri].params = sresize(saves[pri].params, saves[pri].savesize,
struct cmdline_saved_param);
}
saves[pri].params[saves[pri].nsaved].p = p;
saves[pri].params[saves[pri].nsaved].value = value;
saves[pri].nsaved++;
}
static char *cmdline_password = NULL;
void cmdline_cleanup(void)
{
int pri;
if (cmdline_password) {
smemclr(cmdline_password, strlen(cmdline_password));
sfree(cmdline_password);
cmdline_password = NULL;
}
for (pri = 0; pri < NPRIORITIES; pri++) {
sfree(saves[pri].params);
saves[pri].params = NULL;
saves[pri].savesize = 0;
saves[pri].nsaved = 0;
}
}
#define SAVEABLE(pri) do { \
if (need_save) { cmdline_save_param(p, value, pri); return ret; } \
} while (0)
/*
* Similar interface to get_userpass_input(), except that here a -1
* return means that we aren't capable of processing the prompt and
* someone else should do it.
*/
int cmdline_get_passwd_input(prompts_t *p, unsigned char *in, int inlen) {
static int tried_once = 0;
/*
* We only handle prompts which don't echo (which we assume to be
* passwords), and (currently) we only cope with a password prompt
* that comes in a prompt-set on its own.
*/
if (!cmdline_password || in || p->n_prompts != 1 || p->prompts[0]->echo) {
return -1;
}
/*
* If we've tried once, return utter failure (no more passwords left
* to try).
*/
if (tried_once)
return 0;
prompt_set_result(p->prompts[0], cmdline_password);
smemclr(cmdline_password, strlen(cmdline_password));
sfree(cmdline_password);
cmdline_password = NULL;
tried_once = 1;
return 1;
}
/*
* Here we have a flags word which describes the capabilities of
* the particular tool on whose behalf we're running. We will
* refuse certain command-line options if a particular tool
* inherently can't do anything sensible. For example, the file
* transfer tools (psftp, pscp) can't do a great deal with protocol
* selections (ever tried running scp over telnet?) or with port
* forwarding (even if it wasn't a hideously bad idea, they don't
* have the select() infrastructure to make them work).
*/
int cmdline_tooltype = 0;
static int cmdline_check_unavailable(int flag, char *p)
{
if (cmdline_tooltype & flag) {
cmdline_error("option \"%s\" not available in this tool", p);
return 1;
}
return 0;
}
#define UNAVAILABLE_IN(flag) do { \
if (cmdline_check_unavailable(flag, p)) return ret; \
} while (0)
/*
* Process a standard command-line parameter. `p' is the parameter
* in question; `value' is the subsequent element of argv, which
* may or may not be required as an operand to the parameter.
* If `need_save' is 1, arguments which need to be saved as
* described at this top of this file are, for later execution;
* if 0, they are processed normally. (-1 is a special value used
* by pterm to count arguments for a preliminary pass through the
* argument list; it causes immediate return with an appropriate
* value with no action taken.)
* Return value is 2 if both arguments were used; 1 if only p was
* used; 0 if the parameter wasn't one we recognised; -2 if it
* should have been 2 but value was NULL.
*/
#define RETURN(x) do { \
if ((x) == 2 && !value) return -2; \
ret = x; \
if (need_save < 0) return x; \
} while (0)
int cmdline_process_param(char *p, char *value, int need_save, Conf *conf)
{
int ret = 0;
if (!strcmp(p, "-load")) {
RETURN(2);
/* This parameter must be processed immediately rather than being
* saved. */
do_defaults(value, conf);
loaded_session = TRUE;
cmdline_session_name = dupstr(value);
return 2;
}
if (!strcmp(p, "-ssh")) {
RETURN(1);
UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
SAVEABLE(0);
default_protocol = PROT_SSH;
default_port = 22;
conf_set_int(conf, CONF_protocol, default_protocol);
conf_set_int(conf, CONF_port, default_port);
return 1;
}
if (!strcmp(p, "-telnet")) {
RETURN(1);
UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
SAVEABLE(0);
default_protocol = PROT_TELNET;
default_port = 23;
conf_set_int(conf, CONF_protocol, default_protocol);
conf_set_int(conf, CONF_port, default_port);
return 1;
}
if (!strcmp(p, "-rlogin")) {
RETURN(1);
UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
SAVEABLE(0);
default_protocol = PROT_RLOGIN;
default_port = 513;
conf_set_int(conf, CONF_protocol, default_protocol);
conf_set_int(conf, CONF_port, default_port);
return 1;
}
if (!strcmp(p, "-raw")) {
RETURN(1);
UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
SAVEABLE(0);
default_protocol = PROT_RAW;
conf_set_int(conf, CONF_protocol, default_protocol);
}
if (!strcmp(p, "-serial")) {
RETURN(1);
/* Serial is not NONNETWORK in an odd sense of the word */
UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
SAVEABLE(0);
default_protocol = PROT_SERIAL;
conf_set_int(conf, CONF_protocol, default_protocol);
/* The host parameter will already be loaded into CONF_host,
* so copy it across */
conf_set_str(conf, CONF_serline, conf_get_str(conf, CONF_host));
}
if (!strcmp(p, "-v")) {
RETURN(1);
flags |= FLAG_VERBOSE;
}
if (!strcmp(p, "-l")) {
RETURN(2);
UNAVAILABLE_IN(TOOLTYPE_NONNETWORK);
SAVEABLE(0);
conf_set_str(conf, CONF_username, value);
}
if (!strcmp(p, "-loghost")) {
RETURN(2);
UNAVAILABLE_IN(TOOLTYPE_NONNETWORK);
SAVEABLE(0);
conf_set_str(conf, CONF_loghost, value);
}
if ((!strcmp(p, "-L") || !strcmp(p, "-R") || !strcmp(p, "-D"))) {
char type, *q, *qq, *key, *val;
RETURN(2);
UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
SAVEABLE(0);
if (strcmp(p, "-D")) {
/*
* For -L or -R forwarding types:
*
* We expect _at least_ two colons in this string. The
* possible formats are `sourceport:desthost:destport',
* or `sourceip:sourceport:desthost:destport' if you're
* specifying a particular loopback address. We need to
* replace the one between source and dest with a \t;
* this means we must find the second-to-last colon in
* the string.
*
* (This looks like a foolish way of doing it given the
* existence of strrchr, but it's more efficient than
* two strrchrs - not to mention that the second strrchr
* would require us to modify the input string!)
*/
type = p[1]; /* 'L' or 'R' */
q = qq = strchr(value, ':');
while (qq) {
char *qqq = strchr(qq+1, ':');
if (qqq)
q = qq;
qq = qqq;
}
if (!q) {
cmdline_error("-%c expects at least two colons in its"
" argument", type);
return ret;
}
key = dupprintf("%c%.*s", type, q - value, value);
val = dupstr(q+1);
} else {
/*
* Dynamic port forwardings are entered under the same key
* as if they were local (because they occupy the same
* port space - a local and a dynamic forwarding on the
* same local port are mutually exclusive), with the
* special value "D" (which can be distinguished from
* anything in the ordinary -L case by containing no
* colon).
*/
key = dupprintf("L%s", value);
val = dupstr("D");
}
conf_set_str_str(conf, CONF_portfwd, key, val);
sfree(key);
sfree(val);
}
if ((!strcmp(p, "-nc"))) {
char *host, *portp;
RETURN(2);
UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
SAVEABLE(0);
portp = strchr(value, ':');
if (!portp) {
cmdline_error("-nc expects argument of form 'host:port'");
return ret;
}
host = dupprintf("%.*s", portp - value, value);
conf_set_str(conf, CONF_ssh_nc_host, host);
conf_set_int(conf, CONF_ssh_nc_port, atoi(portp + 1));
sfree(host);
}
if (!strcmp(p, "-m")) {
char *filename, *command;
int cmdlen, cmdsize;
FILE *fp;
int c, d;
RETURN(2);
UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
SAVEABLE(0);
filename = value;
cmdlen = cmdsize = 0;
command = NULL;
fp = fopen(filename, "r");
if (!fp) {
cmdline_error("unable to open command file \"%s\"", filename);
return ret;
}
do {
c = fgetc(fp);
d = c;
if (c == EOF)
d = 0;
if (cmdlen >= cmdsize) {
cmdsize = cmdlen + 512;
command = sresize(command, cmdsize, char);
}
command[cmdlen++] = d;
} while (c != EOF);
fclose(fp);
conf_set_str(conf, CONF_remote_cmd, command);
conf_set_str(conf, CONF_remote_cmd2, "");
conf_set_int(conf, CONF_nopty, TRUE); /* command => no terminal */
sfree(command);
}
if (!strcmp(p, "-P")) {
RETURN(2);
UNAVAILABLE_IN(TOOLTYPE_NONNETWORK);
SAVEABLE(1); /* lower priority than -ssh,-telnet */
conf_set_int(conf, CONF_port, atoi(value));
}
if (!strcmp(p, "-pw")) {
RETURN(2);
UNAVAILABLE_IN(TOOLTYPE_NONNETWORK);
SAVEABLE(1);
/* We delay evaluating this until after the protocol is decided,
* so that we can warn if it's of no use with the selected protocol */
if (conf_get_int(conf, CONF_protocol) != PROT_SSH)
cmdline_error("the -pw option can only be used with the "
"SSH protocol");
else {
cmdline_password = dupstr(value);
/* Assuming that `value' is directly from argv, make a good faith
* attempt to trample it, to stop it showing up in `ps' output
* on Unix-like systems. Not guaranteed, of course. */
smemclr(value, strlen(value));
}
}
if (!strcmp(p, "-agent") || !strcmp(p, "-pagent") ||
!strcmp(p, "-pageant")) {
RETURN(1);
UNAVAILABLE_IN(TOOLTYPE_NONNETWORK);
SAVEABLE(0);
conf_set_int(conf, CONF_tryagent, TRUE);
}
if (!strcmp(p, "-noagent") || !strcmp(p, "-nopagent") ||
!strcmp(p, "-nopageant")) {
RETURN(1);
UNAVAILABLE_IN(TOOLTYPE_NONNETWORK);
SAVEABLE(0);
conf_set_int(conf, CONF_tryagent, FALSE);
}
if (!strcmp(p, "-A")) {
RETURN(1);
UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
SAVEABLE(0);
conf_set_int(conf, CONF_agentfwd, 1);
}
if (!strcmp(p, "-a")) {
RETURN(1);
UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
SAVEABLE(0);
conf_set_int(conf, CONF_agentfwd, 0);
}
if (!strcmp(p, "-X")) {
RETURN(1);
UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
SAVEABLE(0);
conf_set_int(conf, CONF_x11_forward, 1);
}
if (!strcmp(p, "-x")) {
RETURN(1);
UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
SAVEABLE(0);
conf_set_int(conf, CONF_x11_forward, 0);
}
if (!strcmp(p, "-t")) {
RETURN(1);
UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
SAVEABLE(1); /* lower priority than -m */
conf_set_int(conf, CONF_nopty, 0);
}
if (!strcmp(p, "-T")) {
RETURN(1);
UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
SAVEABLE(1);
conf_set_int(conf, CONF_nopty, 1);
}
if (!strcmp(p, "-N")) {
RETURN(1);
UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
SAVEABLE(0);
conf_set_int(conf, CONF_ssh_no_shell, 1);
}
if (!strcmp(p, "-C")) {
RETURN(1);
UNAVAILABLE_IN(TOOLTYPE_NONNETWORK);
SAVEABLE(0);
conf_set_int(conf, CONF_compression, 1);
}
if (!strcmp(p, "-1")) {
RETURN(1);
UNAVAILABLE_IN(TOOLTYPE_NONNETWORK);
SAVEABLE(0);
conf_set_int(conf, CONF_sshprot, 0); /* ssh protocol 1 only */
}
if (!strcmp(p, "-2")) {
RETURN(1);
UNAVAILABLE_IN(TOOLTYPE_NONNETWORK);
SAVEABLE(0);
conf_set_int(conf, CONF_sshprot, 3); /* ssh protocol 2 only */
}
if (!strcmp(p, "-i")) {
Filename *fn;
RETURN(2);
UNAVAILABLE_IN(TOOLTYPE_NONNETWORK);
SAVEABLE(0);
fn = filename_from_str(value);
conf_set_filename(conf, CONF_keyfile, fn);
filename_free(fn);
}
if (!strcmp(p, "-4") || !strcmp(p, "-ipv4")) {
RETURN(1);
SAVEABLE(1);
conf_set_int(conf, CONF_addressfamily, ADDRTYPE_IPV4);
}
if (!strcmp(p, "-6") || !strcmp(p, "-ipv6")) {
RETURN(1);
SAVEABLE(1);
conf_set_int(conf, CONF_addressfamily, ADDRTYPE_IPV6);
}
if (!strcmp(p, "-sercfg")) {
char* nextitem;
RETURN(2);
UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
SAVEABLE(1);
if (conf_get_int(conf, CONF_protocol) != PROT_SERIAL)
cmdline_error("the -sercfg option can only be used with the "
"serial protocol");
/* Value[0] contains one or more , separated values, like 19200,8,n,1,X */
nextitem = value;
while (nextitem[0] != '\0') {
int length, skip;
char *end = strchr(nextitem, ',');
if (!end) {
length = strlen(nextitem);
skip = 0;
} else {
length = end - nextitem;
nextitem[length] = '\0';
skip = 1;
}
if (length == 1) {
switch (*nextitem) {
case '1':
case '2':
conf_set_int(conf, CONF_serstopbits, 2 * (*nextitem-'0'));
break;
case '5':
case '6':
case '7':
case '8':
case '9':
conf_set_int(conf, CONF_serdatabits, *nextitem-'0');
break;
case 'n':
conf_set_int(conf, CONF_serparity, SER_PAR_NONE);
break;
case 'o':
conf_set_int(conf, CONF_serparity, SER_PAR_ODD);
break;
case 'e':
conf_set_int(conf, CONF_serparity, SER_PAR_EVEN);
break;
case 'm':
conf_set_int(conf, CONF_serparity, SER_PAR_MARK);
break;
case 's':
conf_set_int(conf, CONF_serparity, SER_PAR_SPACE);
break;
case 'N':
conf_set_int(conf, CONF_serflow, SER_FLOW_NONE);
break;
case 'X':
conf_set_int(conf, CONF_serflow, SER_FLOW_XONXOFF);
break;
case 'R':
conf_set_int(conf, CONF_serflow, SER_FLOW_RTSCTS);
break;
case 'D':
conf_set_int(conf, CONF_serflow, SER_FLOW_DSRDTR);
break;
default:
cmdline_error("Unrecognised suboption \"-sercfg %c\"",
*nextitem);
}
} else if (length == 3 && !strncmp(nextitem,"1.5",3)) {
/* Messy special case */
conf_set_int(conf, CONF_serstopbits, 3);
} else {
int serspeed = atoi(nextitem);
if (serspeed != 0) {
conf_set_int(conf, CONF_serspeed, serspeed);
} else {
cmdline_error("Unrecognised suboption \"-sercfg %s\"",
nextitem);
}
}
nextitem += length + skip;
}
}
return ret; /* unrecognised */
}
void cmdline_run_saved(Conf *conf)
{
int pri, i;
for (pri = 0; pri < NPRIORITIES; pri++)
for (i = 0; i < saves[pri].nsaved; i++)
cmdline_process_param(saves[pri].params[i].p,
saves[pri].params[i].value, 0, conf);
}
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