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ox.h and ox_tag.h have been renamed

/* -*- mode: C; coding: euc-japan -*- */
/* $OpenXM: OpenXM/src/ox_toolkit/ox.c,v 1.12 2000/03/10 12:24:38 ohara Exp $ */

/* 
   This module includes functions for sending/receiveng CMO's.
   Some commnets is written in Japanese by the EUC-JP coded 
   character set.
*/


#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/file.h>

#include "mysocket.h"
#include "ox_toolkit.h"
#include "parse.h"

static int          cmolen_cmo_int32(cmo_int32* c);
static int          cmolen_cmo_list(cmo_list* c);
static int          cmolen_cmo_mathcap(cmo_mathcap* c);
static int          cmolen_cmo_null(cmo_null* c);
static int          cmolen_cmo_string(cmo_string* c);
static int          cmolen_cmo_zz(cmo_zz* c);
static int          cmolen_cmo_monomial32(cmo_monomial32* c);

static int          dump_cmo_int32(cmo_int32* m);
static int          dump_cmo_list(cmo_list* m);
static int          dump_cmo_mathcap(cmo_mathcap* m);
static int          dump_cmo_null(cmo_null* m);
static int          dump_cmo_string(cmo_string* m);
static int          dump_cmo_monomial32(cmo_monomial32* c);
static int          dump_cmo_zz(cmo_zz* c);
static int          dump_string(char *s, int len);
static int          dump_integer(int x);
static int          dump_mpz(mpz_ptr mpz);

static int          login_with_otp(int fd, char* passwd);
static char         *create_otp();

/* CMO_xxx の値の順にならべること(デバッグのため) */
static cmo_null*         receive_cmo_null(int fd);
static cmo_int32*        receive_cmo_int32(int fd);
static cmo_string*       receive_cmo_string(int fd);
static cmo_mathcap*      receive_cmo_mathcap(int fd);
static cmo_list*         receive_cmo_list(int fd);
static cmo_monomial32*   receive_cmo_monomial32(int fd);
static cmo_zz*           receive_cmo_zz(int fd);
static cmo_zero*         receive_cmo_zero(int fd);
static cmo_dms_generic*  receive_cmo_dms_generic(int fd);
static cmo_ring_by_name* receive_cmo_ring_by_name(int fd);
static cmo_distributed_polynomial* receive_cmo_distributed_polynomial(int fd);

static cmo_error2*       receive_cmo_error2(int fd);
static void              receive_mpz(int fd, mpz_ptr mpz);

static int          send_cmo_null(int fd, cmo_null* c);
static int          send_cmo_int32(int fd, cmo_int32* m);
static int          send_cmo_string(int fd, cmo_string* m);
static int          send_cmo_mathcap(int fd, cmo_mathcap* c);
static int          send_cmo_list(int fd, cmo_list* c);
static int          send_cmo_monomial32(int fd, cmo_monomial32* c);
static int          send_cmo_zz(int fd, cmo_zz* c);
static int          send_cmo_error2(int fd, cmo_error2* c);
static int          send_mpz(int fd, mpz_ptr mpz);
static int          send_cmo_distributed_polynomial(int fd, cmo_distributed_polynomial* c);

static void         resize_mpz(mpz_ptr mpz, int size);

static int          print_cmo_int32(cmo_int32* c);
static int          print_cmo_list(cmo_list* li);
static int          print_cmo_mathcap(cmo_mathcap* c);
static int          print_cmo_string(cmo_string* c);

static char*        new_string_set_cmo_null();
static char*        new_string_set_cmo_int32(int integer);
static char*        new_string_set_cmo_list(cmo_list *c);
static char*        new_string_set_cmo_zz(cmo_zz *c);

int ssh_ox_server(char *, char *, char *, short, short);

int current_fd = 0;
int set_current_fd(int fd)
{
	current_fd = fd;
}

/* hook functions. (yet not implemented) */
static hook_t hook_before_send_cmo = NULL;
static hook_t hook_after_send_cmo  = NULL;

int add_hook_before_send_cmo(hook_t func)
{
	hook_before_send_cmo = func;
}

int add_hook_after_send_cmo(hook_t func)
{
	hook_after_send_cmo = func;
}

static cmo *call_hook_before_send_cmo(int fd, cmo *c)
{
	if (hook_before_send_cmo != NULL) {
		return hook_before_send_cmo(fd, c);
	}
	return c;
}

static cmo *call_hook_after_send_cmo(int fd, cmo *c)
{
	if (hook_after_send_cmo != NULL) {
		return hook_after_send_cmo(fd, c);
	}
	return c;
}

/* Handling an error. */
static int current_received_serial = 0;

/* If an error object be needed, then a server call the following function. */
cmo_error2* make_error_object(int err_code, cmo *ob)
{
    cmo_list* li = new_cmo_list();
    append_cmo_list(li, (cmo *)new_cmo_int32(current_received_serial));
    append_cmo_list(li, (cmo *)new_cmo_int32(err_code));
    append_cmo_list(li, ob);
    /* 他の情報を加えるならココ */
    return new_cmo_error2((cmo *)li);
}

#define DEFAULT_SERIAL_NUMBER 0x0000ffff
#define receive_serial_number(x)   (receive_int32(x))

/* getting a next serial number. */
int next_serial()
{
    static int serial_number = DEFAULT_SERIAL_NUMBER;
    return serial_number++;
}

/* sending an object of int32 type. (not equal to cmo_int32 type)  */
int send_int32(int fd, int int32)
{
    int32 = htonl(int32);
    return write(fd, &int32, sizeof(int));
}

/* receiving an object of int32 type. (not equal to cmo_int32 type)  */
int receive_int32(int fd)
{
    int tag;
    read(fd, &tag, sizeof(int));
    return ntohl(tag);
}

/* receiving an (OX_tag, serial number)  */
int receive_ox_tag(int fd)
{
    int serial;
    int tag = receive_int32(fd);
    current_received_serial = receive_serial_number(fd);
    return tag;
}

/* sending an (OX_tag, serial number)  */
int send_ox_tag(int fd, int tag)
{
    send_int32(fd, tag);
    return send_int32(fd, next_serial());
}

/* functions for a cmo_list */
cell* new_cell()
{
    cell* h = malloc(sizeof(cell));
    h->next = NULL;
    h->cmo  = NULL;
    return h;
}

cell* next_cell(cell* this)
{
    return this->next;
}

static cell *tail(cmo_list* this) {
    cell *cp = this->head;
    while (cp->next != NULL) {
        cp = cp->next;
    }
    return cp;
}

int append_cmo_list(cmo_list* this, cmo* newcmo)
{
    cell *cp = tail(this);
    cp->cmo  = newcmo;
    cp->next = new_cell();
    this->length++;
    return 0;
}

cmo *nth_cmo_list(cmo_list* this, int n)
{
	cell *cp = this->head;
	if(this->length <= n) {
		return NULL;
	}
	while(n-- > 0) {
		cp = cp->next;
	}
	return cp->cmo;
}

int length_cmo_list(cmo_list* this)
{
    return this->length;
}

/* functions named receive_cmo_*. */
static cmo_null* receive_cmo_null(int fd)
{
    return new_cmo_null();
}

static cmo_int32* receive_cmo_int32(int fd)
{
    int i = receive_int32(fd);
    return new_cmo_int32(i);
}

static cmo_string* receive_cmo_string(int fd)
{
    int len = receive_int32(fd);
    char* s = malloc(len+1);
    memset(s, '\0', len+1);
    if (len > 0) {
        read(fd, s, len);
    }
    return new_cmo_string(s);
}

static cmo_mathcap* receive_cmo_mathcap(int fd)
{
    cmo* ob = receive_cmo(fd);
    return new_cmo_mathcap(ob);
}

static cmo_list* receive_cmo_list(int fd)
{
    cmo* ob;
    cmo_list* c = new_cmo_list();
    int len = receive_int32(fd);

    while (len>0) {
        ob = receive_cmo(fd);
        append_cmo_list(c, ob);
        len--;
    }
    return c;
}

static cmo_monomial32* receive_cmo_monomial32(int fd)
{
    int i;
    int len = receive_int32(fd);
    cmo_monomial32* c = new_cmo_monomial32(len);

    for(i=0; i<len; i++) {
        c->exps[i] = receive_int32(fd);
    }
    c->coef = receive_cmo(fd);
    return c;
}

static cmo_zz* receive_cmo_zz(int fd)
{
    cmo_zz* c = new_cmo_zz();
    receive_mpz(fd, c->mpz);
    return c;
}

static cmo_zero* receive_cmo_zero(int fd)
{
    return new_cmo_zero();
}

static cmo_dms_generic* receive_cmo_dms_generic(int fd)
{
    return new_cmo_dms_generic();
}

static cmo_ring_by_name* receive_cmo_ring_by_name(int fd)
{
    cmo* ob = receive_cmo(fd);
	/* We need to check semantics but yet ... */
    return new_cmo_ring_by_name(ob);
}

static cmo_distributed_polynomial* receive_cmo_distributed_polynomial(int fd)
{
    cmo* ob;
    cmo_distributed_polynomial* c = new_cmo_distributed_polynomial();
    int len = receive_int32(fd);
    c->ringdef = receive_cmo(fd);

    while (len>0) {
        ob = receive_cmo(fd);
        append_cmo_list((cmo_list *)c, ob);
        len--;
    }
    return c;
}

static cmo_error2* receive_cmo_error2(int fd)
{
    cmo* ob = receive_cmo(fd);
    return new_cmo_error2(ob);
}

/* receive_ox_tag() == OX_DATA の後に呼び出される */
/* 関数ポインタを使った方がきれいに書けるような気がする.  */
/* if (foo[tag] != NULL) foo[tag](fd); とか */

cmo* receive_cmo(int fd)
{
    cmo* m;
    int tag;
    tag = receive_int32(fd);

    switch(tag) {
    case CMO_NULL:
        m = receive_cmo_null(fd);
        break;
    case CMO_INT32:
        m = (cmo *)receive_cmo_int32(fd);
        break;
    case CMO_STRING:
        m = (cmo *)receive_cmo_string(fd);
        break;
    case CMO_MATHCAP:
        m = (cmo *)receive_cmo_mathcap(fd);
        break;
    case CMO_LIST:
        m = (cmo *)receive_cmo_list(fd);
        break;
    case CMO_MONOMIAL32:
        m = (cmo *)receive_cmo_monomial32(fd);
        break;
    case CMO_ZZ:
        m = (cmo *)receive_cmo_zz(fd);
        break;
    case CMO_ZERO:
        m = (cmo *)receive_cmo_zero(fd);
        break;
    case CMO_DMS_GENERIC:
        m = (cmo *)receive_cmo_dms_generic(fd);
        break;
    case CMO_RING_BY_NAME:
        m = (cmo *)receive_cmo_ring_by_name(fd);
        break;
    case CMO_DISTRIBUTED_POLYNOMIAL:
        m = (cmo *)receive_cmo_distributed_polynomial(fd);
        break;
    case CMO_ERROR2:
        m = (cmo *)receive_cmo_error2(fd);
        break;
    case CMO_DATUM:
    case CMO_QQ:
    default:
        fprintf(stderr, "the CMO (%d) is not implemented.\n", m->tag);
    }
    return m;
}

static void receive_mpz(int fd, mpz_ptr mpz)
{
    int i;
    int size  = receive_int32(fd);
    int len   = abs(size);
    resize_mpz(mpz, size);

    for(i=0; i<len; i++) {
        mpz->_mp_d[i] = receive_int32(fd);
    }
}

static void resize_mpz(mpz_ptr mpz, int size)
{
    _mpz_realloc(mpz, abs(size));
    mpz->_mp_size = size;
}

/* functions named new_cmo_*. */
cmo_null* new_cmo_null()
{
    cmo_null* m = malloc(sizeof(cmo_null));
    m->tag = CMO_NULL;
    return m;
}

cmo_int32* new_cmo_int32(int i)
{
    cmo_int32* c;
    c = malloc(sizeof(cmo_int32));
    c->tag     = CMO_INT32;
    c->i = i;
    return c;
}

cmo_string* new_cmo_string(char* s)
{
    cmo_string* c = malloc(sizeof(cmo_string));
    c->tag = CMO_STRING;
    if (s != NULL) {
        c->s = malloc(strlen(s)+1);
        strcpy(c->s, s);
    }else {
        c->s = NULL;
    }
    return c;
}

cmo_mathcap* new_cmo_mathcap(cmo* ob)
{
    cmo_mathcap* c = malloc(sizeof(cmo_mathcap));
    c->tag = CMO_MATHCAP;
    c->ob  = ob;
    return c;
}

cmo_list* new_cmo_list()
{
    cmo_list* c = malloc(sizeof(cmo_list));
    c->tag    = CMO_LIST;
    c->length = 0;
    c->head->next = NULL;
    return c;
}

cmo_monomial32* new_cmo_monomial32()
{
    cmo_monomial32* c = malloc(sizeof(cmo_monomial32));
    c->tag  = CMO_MONOMIAL32;
    return c;
}

cmo_monomial32* new_cmo_monomial32_size(int size)
{
    cmo_monomial32* c = new_cmo_monomial32();
    if (size>0) {
        c->length = size;
        c->exps = malloc(sizeof(int)*size);
    }
    return c;
}

cmo_zz* new_cmo_zz()
{
    cmo_zz* c = malloc(sizeof(cmo_zz));
    c->tag  = CMO_ZZ;
    mpz_init(c->mpz);
    return c;
}

cmo_zz* new_cmo_zz_noinit()
{
    cmo_zz* c = malloc(sizeof(cmo_zz));
    c->tag  = CMO_ZZ;
    return c;
}

cmo_zz* new_cmo_zz_set_si(int i)
{
    cmo_zz* c = new_cmo_zz();
    mpz_set_si(c->mpz, i);
    return c;
}

cmo_zz* new_cmo_zz_set_mpz(mpz_ptr z)
{
    cmo_zz* c = new_cmo_zz();
    mpz_set(c->mpz, z);
    return c;
}

cmo_zz *new_cmo_zz_set_string(char *s)
{
    cmo_zz* c = new_cmo_zz_noinit();
    mpz_init_set_str(c->mpz, s, 10);
    return c;
}

cmo_zz* new_cmo_zz_size(int size)
{
    cmo_zz* c = new_cmo_zz();
    resize_mpz(c->mpz, size);
    return c;
}

cmo_zero* new_cmo_zero()
{
    cmo_zero* m = malloc(sizeof(cmo_zero));
    m->tag = CMO_ZERO;
    return m;
}

cmo_dms_generic* new_cmo_dms_generic()
{
    cmo_dms_generic* m = malloc(sizeof(cmo_dms_generic));
    m->tag = CMO_DMS_GENERIC;
    return m;
}

cmo_ring_by_name* new_cmo_ring_by_name(cmo* ob)
{
    cmo_ring_by_name* c = malloc(sizeof(cmo_ring_by_name));
    c->tag = CMO_RING_BY_NAME;
    c->ob  = ob;
    return c;
}

cmo_indeterminate* new_cmo_indeterminate(cmo* ob)
{
    cmo_indeterminate* c = malloc(sizeof(cmo_indeterminate));
    c->tag = CMO_INDETERMINATE;
    c->ob  = ob;
    return c;
}

cmo_distributed_polynomial* new_cmo_distributed_polynomial()
{
    cmo_distributed_polynomial* c = malloc(sizeof(cmo_distributed_polynomial));
    c->tag     = CMO_DISTRIBUTED_POLYNOMIAL;
    c->length  = 0;
    c->head->next = NULL;
    c->ringdef = NULL;
    return c;
}

cmo_error2* new_cmo_error2(cmo* ob)
{
    cmo_error2* c = malloc(sizeof(cmo_error2));
    c->tag = CMO_ERROR2;
    c->ob  = ob;
    return c;
}

void send_ox_command(int fd, int sm_command)
{
    send_ox_tag(fd, OX_COMMAND);
    send_int32(fd, sm_command);
}

int print_cmo(cmo* c)
{
    int tag = c->tag;

    symbol_t symp = lookup_by_tag(tag);
    if (symp != NULL) {
        fprintf(stderr, "(%s", symp->key);
    }else {     
        fprintf(stderr, "(%d", tag);
    }

    switch(tag) {
    case CMO_LIST:
        print_cmo_list((cmo_list *)c);
        break;
    case CMO_INT32:
        print_cmo_int32((cmo_int32 *)c);
        break;
    case CMO_MATHCAP:
    case CMO_INDETERMINATE:
    case CMO_RING_BY_NAME:
    case CMO_ERROR2:
        print_cmo_mathcap((cmo_mathcap *)c);
        break;
    case CMO_STRING:
        print_cmo_string((cmo_string *)c);
        break;
    case CMO_NULL:
    case CMO_ZERO:
    case CMO_DMS_GENERIC:
        fprintf(stderr, ")");
        break;
    default:
        fprintf(stderr, "print_cmo() does not know how to print.\n");
    }
}

static int print_cmo_int32(cmo_int32* c)
{
    fprintf(stderr, ", %d)", c->i);
}

static int print_cmo_list(cmo_list* li)
{
    cell* cp = li->head;
    while(cp->next != NULL) {
        fprintf(stderr, ", ");
        print_cmo(cp->cmo);
        cp=cp->next;
    }
    fprintf(stderr, ")");
}

static int print_cmo_mathcap(cmo_mathcap* c)
{
    fprintf(stderr, ", ");
    print_cmo(c->ob);
    fprintf(stderr, ")");
}

static int print_cmo_string(cmo_string* c)
{
    fprintf(stderr, ", \"%s\")", c->s);
}

void ox_close(ox_file_t sv)
{
    send_ox_command(sv->control, SM_control_kill);
#ifdef DEBUG
    sleep(2);
	/* We wait thar an OpenXM server terminates. */
    fprintf(stderr, "I have closed the connection to an Open XM server.\n");
#endif
}

void ox_shutdown(ox_file_t sv)
{
	/* We need to use SM_shutdown but yet ... */
	ox_close(sv);
}

int ox_cmo_rpc(ox_file_t sv, char *function, int argc, cmo *argv[])
{
	int i = argc;
	while(i-- > 0) {
		send_ox_cmo(sv->stream, argv[i]);
	}
	send_ox_cmo(sv->stream, (cmo *)new_cmo_int32(argc));
	send_ox_cmo(sv->stream, (cmo *)new_cmo_string(function));
	send_ox_command(sv->stream, SM_executeFunction);
}

void ox_execute_string(ox_file_t sv, char* s)
{
	send_ox_cmo(sv->stream, (cmo *)new_cmo_string(s));
	send_ox_command(sv->stream, SM_executeStringByLocalParser);
}

void ox_push_cmd(ox_file_t sv, int sm_code)
{
    send_ox_command(sv->stream, sm_code);
}

cmo_mathcap* ox_mathcap(ox_file_t sv)
{
    send_ox_command(sv->stream, SM_mathcap);
    send_ox_command(sv->stream, SM_popCMO);
    receive_ox_tag(sv->stream);          /* OX_DATA */
    return (cmo_mathcap *)receive_cmo(sv->stream);
}

char* ox_popString(ox_file_t sv)
{
    cmo_string* m = NULL;

    send_ox_command(sv->stream, SM_popString);
    receive_ox_tag(sv->stream); /* OX_DATA */
    m = (cmo_string *)receive_cmo(sv->stream);
    return m->s;
}

int ox_pops(ox_file_t sv, int num)
{
	send_ox_cmo(sv->stream, (cmo *)new_cmo_int32(num));
    send_ox_command(sv->stream, SM_pops);
}

cmo* ox_pop_cmo(ox_file_t sv)
{
    send_ox_command(sv->stream, SM_popCMO);
    receive_ox_tag(sv->stream); /* OX_DATA */
    return receive_cmo(sv->stream);
}

void ox_push_cmo(ox_file_t sv, cmo *c)
{
	send_ox_cmo(sv->stream, c);
}

/* a dummy function for flushing a connection. */
int ox_flush(ox_file_t sv)
{
	return 1;
}

/* a dummy password function. */
static char *create_otp()
{
    static char otp[] = "otpasswd";
    return otp;
}

/* proceeding an one time password. */
static int login_with_otp(int fd, char* passwd)
{
    int len   = strlen(passwd)+1;
    char *buf = alloca(len);
    int n     = read(fd, buf, len);
    int ret   = strcmp(passwd, buf);

#ifdef DEBUG
    if (ret != 0) {
        fprintf(stderr, "Socket#%d: Login incorrect.\n", fd);
    }else {
        fprintf(stderr, "Socket#%d: login!.\n", fd);
    }
    fprintf(stderr, "password = (%s), %d bytes.\n", passwd, len);
    fprintf(stderr, "received = (%s), %d bytes.\n", buf, n);
    fflush(stderr);
#endif

    return ret;
}

/* The environment variable OpenXM_HOME must be defined. */
static char *concat_openxm_home_bin(char *s)
{
    char *path;
    char *base;

    /* if s includes '/' then it is not concaticated. */
	if (strchr(s, '/') != NULL) {
		return s;
	}

	base = getenv("OpenXM_HOME");
	path = malloc(strlen(base)+6+strlen(s));
	sprintf(path, "%s/bin/%s", base, s);
	return path;
}

/* example: which("xterm", getenv("PATH")); */
static char *which(char *prog, char *path_env)
{
	char *tok;
	char *path;
	char delim[] = ":";
	char *e = alloca(strlen(path_env)+1);
	strcpy(e, path_env);
	tok = strtok(e, delim);
	while (tok != NULL) {
		char *path = malloc(strlen(tok)+strlen(prog)+2);
		sprintf(path, "%s/%s", tok, prog);
		if (access(path, X_OK&R_OK) == 0) {
			return path;
		}
		free(path);
		tok = strtok(NULL, delim);
	}
	return NULL;
}

static int mysocketAccept2(int fd, char *pass)
{
    fd = mysocketAccept(fd);
    if(login_with_otp(fd, pass)==0) {
        decideByteOrderClient(fd, 0);
        return fd;
    }
    close(fd);
    return -1;
}

/* if it is not 0, then we use oxlog to execute ox. */
static int flag_ox_start_with_oxlog = 1;

/*
   (-reverse 版の ox_start)
   ox_start は クライアントが呼び出すための関数である.
   サーバでは使われない.  ctl_prog はコントロールサーバであり,
   -ox, -reverse, -data, -control, -pass, -host
   というオプションを理解することを仮定する. dat_prog は計算サーバである.
   接続時には, sv->control を先にオープンする.
*/

ox_file_t ox_start(char* host, char* ctl_prog, char* dat_prog)
{
    ox_file_t sv = NULL;
    char *pass;
    char ctl[128], dat[128];
    short portControl = 0;  /* short! */
    short portStream  = 0;
	char *oxlog;

	/* not overwrite */
#if 0
	setenv("OpenXM_HOME", "/usr/local/OpenXM", 0);
#endif
	if (getenv("OpenXM_HOME") == NULL) {
		putenv("OpenXM_HOME=/usr/local/OpenXM");
	}

	oxlog    = concat_openxm_home_bin("oxlog");
	ctl_prog = concat_openxm_home_bin(ctl_prog);
	dat_prog = concat_openxm_home_bin(dat_prog);

    sv = malloc(sizeof(__ox_file_struct));
    sv->control = mysocketListen(host, &portControl);
    sv->stream  = mysocketListen(host, &portStream);

    sprintf(ctl, "%d", portControl);
    sprintf(dat, "%d", portStream);
    pass = create_otp();

    if (fork() == 0) {
		if (flag_ox_start_with_oxlog) {
			execl(oxlog, oxlog, "xterm", "-icon", "-e", ctl_prog, 
				  "-reverse", "-ox", dat_prog,
				  "-data", dat, "-control", ctl, "-pass", pass,
				  "-host", host, NULL);
		}else {
			dup2(2, 1);
			dup2(open(tempnam("/tmp", "ox."), O_RDWR|O_CREAT|O_TRUNC, 0644),  2);
			execl(ctl_prog, ctl_prog, "-reverse", "-ox", dat_prog,
				  "-data", dat, "-control", ctl, "-pass", pass,
				  "-host", host, NULL);
		}
		exit(1);
    }

    if ((sv->control = mysocketAccept2(sv->control, pass)) == -1) {
        close(sv->stream);
        return NULL;
    }
    /* waiting 10 micro second. */
    usleep(10);
    if((sv->stream  = mysocketAccept2(sv->stream, pass)) == -1) {
        return NULL;
    }
    return sv;
}

ox_file_t ox_start_remote_with_ssh(char *dat_prog, char* host)
{
	ssh_ox_server(host, "ox", dat_prog, 1200, 1300);
	return ox_start_insecure_nonreverse(host, 1200, 1300);
}

/* ssh -f host oxlog xterm -e ox -ox ox_asir ... */
int ssh_ox_server(char *host, char *ctl_prog, char *dat_prog, short portControl, short portStream)
{
	char *oxlog;
	char *ssh;

	oxlog    = concat_openxm_home_bin("oxlog");
	ctl_prog = concat_openxm_home_bin(ctl_prog);
	dat_prog = concat_openxm_home_bin(dat_prog);

	ssh = which("ssh", getenv("PATH"));

	if (fork() == 0) {
		execl(ssh, ssh, "-f", host, oxlog, "xterm", "-icon",
			  "-e", ctl_prog, "-insecure", "-ox", dat_prog, 
			  "-data", portStream, "-control", portControl, 
			  "-host", host, NULL);
		exit(1);
	}
}

/*
   (-insecure 版の ox_start)  まだ、中身はありません。
   ox_start_insecure_nonreverse は クライアントが呼び出すための関数である.
   接続時には, sv->control を先にオープンする.
   既定値:
   portControl = 1200
   portStream  = 1300
*/

ox_file_t ox_start_insecure_nonreverse(char* host, short portControl, short portStream)
{
    ox_file_t sv = malloc(sizeof(__ox_file_struct));

    sv->control = mysocketOpen(host, portControl);
#if 0
    /* ox は insecure のとき byte order の決定が正しくできないようだ... */
    decideByteOrderClient(sv->control, 0);
#endif
    /* wainting 10 micro second. */
    usleep(10);
    sv->stream  = mysocketOpen(host, portStream);
    decideByteOrderClient(sv->stream, 0);
    return sv;
}

void ox_reset(ox_file_t sv)
{
    send_ox_command(sv->control, SM_control_reset_connection);

    receive_ox_tag(sv->control);      /* OX_DATA */
    receive_cmo(sv->control);         /* (CMO_INT32, 0) */

    while(receive_ox_tag(sv->stream) != OX_SYNC_BALL) {
        receive_cmo(sv->stream); /* skipping a message. */
    }

    send_ox_tag(sv->stream, OX_SYNC_BALL);
#ifdef DEBUG
    fprintf(stderr, "I have reset an Open XM server.\n");
#endif
}

/* the following functions are needed by bconv.c */

/* cmolen 関数は cmo の(送信時の)バイト長を返す. */
/* cmolen_XXX 関数は cmo_XXX の tag を除いたバイト長を返す. */

static int cmolen_cmo_null(cmo_null* c)
{
    return 0;
}

static int cmolen_cmo_int32(cmo_int32* c)
{
    return sizeof(int);
}

static int cmolen_cmo_string(cmo_string* c)
{
    return sizeof(int)+strlen(c->s);
}

static int cmolen_cmo_mathcap(cmo_mathcap* c)
{
    return cmolen_cmo(c->ob);
}

static int cmolen_cmo_list(cmo_list* c)
{
    int size = sizeof(int);
    cell* cp = c->head;

    while(cp->next != NULL) {
        size += cmolen_cmo(cp->cmo);
        cp = cp->next;
    }
    return size;
}

static int cmolen_cmo_monomial32(cmo_monomial32* c)
{
    int len = (c->length + 1)*sizeof(int);
    return len + cmolen_cmo(c->coef);
}

static int cmolen_cmo_zz(cmo_zz* c)
{
    int len = abs(c->mpz->_mp_size);
    return sizeof(len) + len*sizeof(int);
}

static int cmolen_cmo_distributed_polynomial(cmo_distributed_polynomial* c)
{
    return cmolen_cmo_list((cmo_list *)c) + cmolen_cmo(c->ringdef);
}

/* calculating the length of the byte stream of given CMO.  */
int cmolen_cmo(cmo* c)
{
    int size = sizeof(int);

    switch(c->tag) {
    case CMO_NULL:
    case CMO_ZERO:
    case CMO_DMS_GENERIC:
        size += cmolen_cmo_null(c);
        break;
    case CMO_INT32:
        size += cmolen_cmo_int32((cmo_int32 *)c);
        break;
    case CMO_STRING:
        size += cmolen_cmo_string((cmo_string *)c);
        break;
    case CMO_MATHCAP:
    case CMO_RING_BY_NAME:
    case CMO_INDETERMINATE:
    case CMO_ERROR2:
        size += cmolen_cmo_mathcap((cmo_mathcap *)c);
        break;
    case CMO_LIST:
        size += cmolen_cmo_list((cmo_list *)c);
        break;
    case CMO_MONOMIAL32:
        size += cmolen_cmo_monomial32((cmo_monomial32 *)c);
        break;
    case CMO_ZZ:
        size += cmolen_cmo_zz((cmo_zz *)c);
        break;
    case CMO_DISTRIBUTED_POLYNOMIAL:
        size += cmolen_cmo_distributed_polynomial((cmo_distributed_polynomial *)c);
        break;
    default:
    }
    return size;
}

static int  d_ptr;
static char *d_buf;

int init_dump_buffer(char *s)
{
    d_buf = s;
    d_ptr = 0;
}

static int dump_cmo_null(cmo_null* m)
{
    return 0;
}

static int dump_cmo_int32(cmo_int32* m)
{
    dump_integer(m->i);
}

static int dump_cmo_string(cmo_string* m)
{
    int len = strlen(m->s);
    dump_integer(len);
    dump_string(m->s, len);
}

static int dump_cmo_mathcap(cmo_mathcap* c)
{
    dump_cmo(c->ob);
}

static int dump_cmo_list(cmo_list* m)
{
    cell* cp = m->head;
    int len = length_cmo_list(m);
    dump_integer(len);

    while(cp->next != NULL) {
        dump_cmo(cp->cmo);
        cp = cp->next;
    }
}

static int dump_cmo_monomial32(cmo_monomial32* c)
{
    int i;
    int length = c->length;
    dump_integer(c->length);
    for(i=0; i<length; i++) {
        dump_integer(c->exps[i]);
    }
    dump_cmo(c->coef);
}

static int dump_cmo_zz(cmo_zz* c)
{
    dump_mpz(c->mpz);
}

static int dump_cmo_distributed_polynomial(cmo_distributed_polynomial* m)
{
    cell* cp = m->head;
    int len = length_cmo_list((cmo_list *)m);
    dump_integer(len);
    dump_cmo(m->ringdef);
    while(cp != NULL) {
        dump_cmo(cp->cmo);
        cp = cp->next;
    }
}

/* after its tag is sent, we invoke each functions. */
int dump_cmo(cmo* m)
{
    dump_integer(m->tag);
    switch(m->tag) {
    case CMO_NULL:
    case CMO_ZERO:
    case CMO_DMS_GENERIC:
        dump_cmo_null(m);
        break;
    case CMO_INT32:
        dump_cmo_int32((cmo_int32 *)m);
        break;
    case CMO_STRING:
        dump_cmo_string((cmo_string *)m);
        break;
    case CMO_MATHCAP:
    case CMO_RING_BY_NAME:
    case CMO_INDETERMINATE:
    case CMO_ERROR2:
        dump_cmo_mathcap((cmo_mathcap *)m);
        break;
    case CMO_LIST:
        dump_cmo_list((cmo_list *)m);
        break;
    case CMO_MONOMIAL32:
        dump_cmo_monomial32((cmo_monomial32 *)m);
        break;
    case CMO_ZZ:
        dump_cmo_zz((cmo_zz *)m);
        break;
    case CMO_DISTRIBUTED_POLYNOMIAL:
        dump_cmo_distributed_polynomial((cmo_distributed_polynomial *)m);
        break;
    default:
    }
}

static int dump_mpz(mpz_ptr mpz)
{
    int i;
    int len = abs(mpz->_mp_size);
    dump_integer(mpz->_mp_size);
    for(i=0; i<len; i++) {
        dump_integer(mpz->_mp_d[i]);
    }
    return;
}

static int dump_string(char *s, int len)
{
    memcpy(&d_buf[d_ptr], s, len);
    d_ptr += len;
}

static int dump_integer(int x)
{
    int nx = htonl(x);
    dump_string((char *)&nx, sizeof(int));
}

int dump_ox_data(ox_data* m)
{
    dump_integer(OX_DATA);
    dump_integer(-1);
    dump_cmo(m->cmo);
}

int dump_ox_command(ox_command* m)
{
    dump_integer(OX_COMMAND);
    dump_integer(-1);
    dump_integer(m->command);
}

int send_ox(int fd, ox *m)
{
    int code;
	switch(m->tag) {
	case OX_DATA:
        send_ox_cmo(fd, ((ox_data *)m)->cmo);
		break;
	case OX_COMMAND:
		send_ox_command(fd, ((ox_command *)m)->command);
		break;
	default:
#if 0
        /* CMO?? */
        send_ox_cmo(s->stream, (cmo *)m);
#endif
    }
}

int send_ox_cmo(int fd, cmo* m)
{
    send_ox_tag(fd, OX_DATA);
    send_cmo(fd, m);
}

/* send_cmo_* functions */
static int send_cmo_null(int fd, cmo_null* c)
{
    return 0;
}

static int send_cmo_int32(int fd, cmo_int32* m)
{
    send_int32(fd, m->i);
}

static int send_cmo_string(int fd, cmo_string* m)
{
    int len = (m->s != NULL)? strlen(m->s): 0;
    send_int32(fd, len);
    if (len > 0) {
        write(fd, m->s, len);
    }
    return 0;
}

static int send_cmo_mathcap(int fd, cmo_mathcap* c)
{
    send_cmo(fd, c->ob);
    return 0;
}

static int send_cmo_list(int fd, cmo_list* c)
{
    cell* cp = c->head;
    int len = length_cmo_list(c);
    send_int32(fd, len);

    while(cp->next != NULL) {
        send_cmo(fd, cp->cmo);
        cp = cp->next;
    }
    return 0;
}

static int send_cmo_distributed_polynomial(int fd, cmo_distributed_polynomial* c)
{
    cell* cp = c->head;
    int len = length_cmo_list((cmo_list *)c);
    send_int32(fd, len);
    send_cmo(fd, c->ringdef);

    while(cp->next != NULL) {
        send_cmo(fd, cp->cmo);
        cp = cp->next;
    }
    return 0;
}

static int send_cmo_monomial32(int fd, cmo_monomial32* c)
{
    int i;
    int len = c->length;
    send_int32(fd, len);
    for(i=0; i<len; i++) {
        send_int32(fd, c->exps[i]);
    }
    send_cmo(fd, c->coef);
    return 0;
}

static int send_cmo_zz(int fd, cmo_zz* c)
{
    send_mpz(fd, c->mpz);
    return 0;
}

static int send_cmo_error2(int fd, cmo_error2* c)
{
    send_cmo(fd, c->ob);
    return 0;
}

/* sending a CMO.  (Remarks: OX_tag is already sent.) */
int send_cmo(int fd, cmo* c)
{
    int tag = c->tag;

	c = call_hook_before_send_cmo(fd, c);

    send_int32(fd, tag);
    switch(tag) {
    case CMO_NULL:
    case CMO_ZERO:
    case CMO_DMS_GENERIC:
        send_cmo_null(fd, c);  /* empty function. */
        break;
    case CMO_INT32:
        send_cmo_int32(fd, (cmo_int32 *)c);
        break;
    case CMO_STRING:
        send_cmo_string(fd, (cmo_string *)c);
        break;
    case CMO_MATHCAP:
    case CMO_ERROR2:
    case CMO_RING_BY_NAME:
    case CMO_INDETERMINATE:
        send_cmo_mathcap(fd, (cmo_mathcap *)c);
        break;
    case CMO_LIST:
        send_cmo_list(fd, (cmo_list *)c);
        break;
    case CMO_MONOMIAL32:
        send_cmo_monomial32(fd, (cmo_monomial32 *)c);
        break;
    case CMO_ZZ:
        send_cmo_zz(fd, (cmo_zz *)c);
        break;
    case CMO_DISTRIBUTED_POLYNOMIAL:
        send_cmo_distributed_polynomial(fd, (cmo_distributed_polynomial *)c);
        break;
    default:
		call_hook_after_send_cmo(fd, c);
    }
}

static int send_mpz(int fd, mpz_ptr mpz)
{
    int i;
    int len = abs(mpz->_mp_size);
    send_int32(fd, mpz->_mp_size);
    for(i=0; i<len; i++) {
        send_int32(fd, mpz->_mp_d[i]);
    }
    return 0;
}

ox_data* new_ox_data(cmo* c)
{
    ox_data* m = malloc(sizeof(ox_data));
    m->tag = OX_DATA;
    m->cmo = c;
    return m;
}

ox_command* new_ox_command(int sm_code)
{
    ox_command* m = malloc(sizeof(ox_command));
    m->tag = OX_COMMAND;
    m->command = sm_code;
    return m;
}

ox_sync_ball* new_ox_sync_ball()
{
    ox_sync_ball *m = malloc(sizeof(ox_sync_ball));
    m->tag = OX_SYNC_BALL;
    return m;
}

#define ID_TEMP   "(CMO_LIST, (CMO_INT32, %d), (CMO_STRING, \"%s\"), (CMO_STRING, \"%s\"), (CMO_STRING, \"%s\"))"

static cmo_list* make_list_of_id(int ver, char* ver_s, char* sysname)
{
    cmo_list *cap;
    char buff[512];

    sprintf(buff, ID_TEMP, ver, sysname, ver_s, getenv("HOSTTYPE"));
    init_parser(buff);
    cap = (cmo_list *)parse();

    return cap;
}

static cmo_list *make_list_of_tag(int type)
{
    cmo_list *li = new_cmo_list();
    symbol_t symp;
    int i = 0;
    while((symp = lookup(i++))->key != NULL) {
        if (symp->type == type) {
            append_cmo_list(li, (cmo *)new_cmo_int32(symp->tag));
        }
    }
    return li;
}

cmo* make_mathcap_object(int version, char *id_string)
{
    char *sysname    = "ox_math";
    cmo_list *li     = new_cmo_list();
    cmo_list *li_1st = make_list_of_id(version, id_string, sysname);
    cmo_list *li_2nd = make_list_of_tag(IS_SM);
    cmo_list *li_3rd = new_cmo_list();
    cmo_list *li_cmo = make_list_of_tag(IS_CMO);

    cmo_list *li_ox_data  = new_cmo_list();
    append_cmo_list(li_ox_data,  (cmo *)new_cmo_int32(OX_DATA));
    append_cmo_list(li_ox_data,  (cmo *)li_cmo);
    append_cmo_list(li_3rd, (cmo *)li_ox_data);

    append_cmo_list(li, (cmo *)li_1st);
    append_cmo_list(li, (cmo *)li_2nd);
    append_cmo_list(li, (cmo *)li_3rd);

    return (cmo *)new_cmo_mathcap((cmo *)li);
}

/* ファイルディスクリプタ fd の通信路での integer の byte order を決定する */
/* 実際には order (0,1,or 0xFF)をみてはいない */
int decideByteOrderClient(oxfd fd, int order)
{
    char zero = OX_BYTE_NETWORK_BYTE_ORDER;
    char dest;
    read(fd, &dest, sizeof(char));
    write(fd, &zero, sizeof(char));
    return 0;
}

/* Server 側ではこちらを用いる */
/* いまの実装は dup されていることが前提になっている */
int decideByteOrderServer(oxfd fd, int order)
{
    char zero = OX_BYTE_NETWORK_BYTE_ORDER;
    char dest;
    write(fd, &zero, sizeof(char));
    read(fd, &dest, sizeof(char));
    return 0;
}

/* cmo と string (ここではC言語のstring) の変換関数群 */
static char *new_string_set_cmo_zz(cmo_zz *c)
{
    return mpz_get_str(NULL, 10, c->mpz);
}

static char *new_string_set_cmo_null()
{
    static char* null_string = "";
    return null_string;
}

static char *new_string_set_cmo_int32(int integer)
{
    char buff[1024];
    char *s;

    sprintf(buff, "%d", integer);
    s = malloc(strlen(buff)+1);
    strcpy(s, buff);

    return s;
}

static char *new_string_set_cmo_list(cmo_list *m)
{
    char *s;
    int i;
    int size = 0;
    int len = length_cmo_list(m);
    char **sp = malloc(len*sizeof(cmo *));

    cell *cp = m->head;
    for(i = 0; i < len; i++) {
        sp[i] = new_string_set_cmo(cp->cmo);
        size += strlen(sp[i]) + 3;
        cp = cp->next;
    }
    s = malloc(size+2);
    strcpy(s, "[ ");
    for(i = 0; i < len - 1; i++) {
        strcat(s, sp[i]);
        strcat(s, " , ");
    }
    strcat(s, sp[len-1]);
    strcat(s, " ]");
    free(sp);
    return s;
}

char *new_string_set_cmo(cmo *m)
{
    symbol_t symp;
    switch(m->tag) {
    case CMO_ZZ:
        return new_string_set_cmo_zz((cmo_zz *)m);
    case CMO_INT32:
        return new_string_set_cmo_int32(((cmo_int32 *)m)->i);
    case CMO_STRING:
        return ((cmo_string *)m)->s;
    case CMO_NULL:
        return new_string_set_cmo_null();
    case CMO_LIST:
        return new_string_set_cmo_list((cmo_list *)m);
    default:
#ifdef DEBUG
        symp = lookup_by_tag(m->tag);
        fprintf(stderr, "I do not know how to convert %s to a string.\n", symp->key);
#endif
        /* yet not implemented. */
        return NULL;
    }
}