/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright (c) 1989, 2010, Oracle and/or its affiliates. All rights reserved.
 */

/*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/*        All Rights Reserved   */

#include "mt.h"
#include "uucp.h"

#include <unistd.h>
#include <string.h>
#include "sysfiles.h"
#include <sys/stropts.h>

/*
 * manage systems files (Systems, Devices, and Dialcodes families).
 *
 * also manage new file Devconfig, allows per-device setup.
 * present use is to specify what streams modules to push/pop for
 * AT&T TLI/streams network.
 *
 * TODO:
 *      call bsfix()?
 *      combine the 3 versions of everything (sys, dev, and dial) into one.
 *      allow arbitrary classes of service.
 *      need verifysys() for uucheck.
 *      nameserver interface?
 *      pass sysname (or 0) to getsysline().  (might want reg. exp. or
 *              NS processing)
 */

/* private variables */
static void tokenize(void);
static void nameparse(void);
static void setfile(char **, char *);
static void setioctl(char **, char *);
static void scansys(const char *);
static void scancfg(char *, char *);
static void setconfig(void);
static int namematch(const char *label, char *line, const char *name);
static int nextdialers(void);
static int nextdevices(void);
static int nextsystems(void);
static int getaline(FILE *, char *);

/* pointer arrays might be dynamically allocated */
static char *Systems[64];       /* list of Systems files */
static char *Devices[64];       /* list of Devices files */
static char *Dialers[64];       /* list of Dialers files */
static char *Pops[64];          /* list of STREAMS modules to be popped */
static char *Pushes[64];        /* list of STREAMS modules to be pushed */

static int nsystems;            /* index into list of Systems files */
static int ndevices;            /* index into list of Devices files */
static int ndialers;            /* index into list of Dialers files */
static int npops;               /* index into list of STREAMS modules */
                                                        /* to be popped */
static int npushes;             /* index into list of STREAMS modules */
                                                        /* to be pushed */

static unsigned connecttime, expecttime;

static FILE *fsystems;
static FILE *fdevices;
static FILE *fdialers;

/* this might be dynamically allocated */
#define NTOKENS 16
static char *tokens[NTOKENS], **tokptr;

/* export these */
static void setservice(const char *service);
static void sysreset(void);
static void devreset(void);
static void dialreset(void);
static void setdevcfg(char *, char *);
static void setservice(const char *);

/* import these */
extern char *strsave(const char *);
static int eaccess(char *, mode_t);

/*
 * setservice init's Systems, Devices, Dialers lists from Sysfiles
 */
static void
setservice(const char *service)
{
        setconfig();
        scansys(service);
}

/*
 * setdevcfg init's Pops, Pushes lists from Devconfig
 */

static void
setdevcfg(char *service, char *device)
{
        scancfg(service, device);
}

/*      administrative files access */
static int
sysaccess(int type)
{
        char errformat[BUFSIZ];

        switch (type) {
        case ACCESS_SYSTEMS:
                return (access(Systems[nsystems], R_OK));
        case ACCESS_DEVICES:
                return (access(Devices[ndevices], R_OK));
        case ACCESS_DIALERS:
                return (access(Dialers[ndialers], R_OK));
        case EACCESS_SYSTEMS:
                return (eaccess(Systems[nsystems], R_OK));
        case EACCESS_DEVICES:
                return (eaccess(Devices[ndevices], R_OK));
        case EACCESS_DIALERS:
                return (eaccess(Dialers[ndialers], R_OK));
        }
        (void) sprintf(errformat, "bad access type %d", type);
        logent(errformat, "sysaccess");
        return (FAIL);
}


/*
 * read Sysfiles, set up lists of Systems/Devices/Dialers file names.
 * allow multiple entries for a given service, allow a service
 * type to describe resources more than once, e.g., systems=foo:baz systems=bar.
 */
static void
scansys(const char *service)
{       FILE *f;
        char *tok, buf[BUFSIZ];
        char **tptr;

        /*
         * Release and Initialize previously allocated memory
         * for Systems, Devices and Dialers.
         */
        nsystems = 0;
        tptr = Systems;
        while (*tptr) {
                free(*tptr);
                *tptr = NULL;
                tptr++;
        }

        ndevices = 0;
        tptr = Devices;
        while (*tptr) {
                free(*tptr);
                *tptr = NULL;
                tptr++;
        }

        ndialers = 0;
        tptr = Dialers;
        while (*tptr) {
                free(*tptr);
                *tptr = NULL;
                tptr++;
        }

        if ((f = fopen(SYSFILES, "rF")) != 0) {
                while (getaline(f, buf) > 0) {
                        /* got a (logical) line from Sysfiles */
                        /* strtok's of this buf continue in tokenize() */
                        tok = strtok(buf, " \t");
                        if (namematch("service=", tok, service)) {
                                tokenize();
                                nameparse();
                        }
                }
                (void) fclose(f);
        }

        /* if didn't find entries in Sysfiles, use defaults */
        if (Systems[0] == NULL) {
                Systems[0] = strsave(SYSTEMS);
                ASSERT(Systems[0] != NULL, "Ct_ALLOCATE", "scansys: Systems",
                                                                        0);
                Systems[1] = NULL;
        }
        if (Devices[0] == NULL) {
                Devices[0] = strsave(DEVICES);
                ASSERT(Devices[0] != NULL, "Ct_ALLOCATE", "scansys: Devices",
                                                                        0);
                Devices[1] = NULL;
        }
        if (Dialers[0] == NULL) {
                Dialers[0] = strsave(DIALERS);
                ASSERT(Dialers[0] != NULL, "Ct_ALLOCATE", "scansys: Dialers",
                                                                        0);
                Dialers[1] = NULL;
        }
}


/*
 * read Devconfig.  allow multiple entries for a given service, allow a service
 * type to describe resources more than once, e.g., push=foo:baz push=bar.
 */
static void
scancfg(char *service, char *device)
{       FILE *f;
        char *tok, buf[BUFSIZ];

        /* (re)initialize device-specific information */
        npops = npushes = 0;
        Pops[0] = Pushes[0] = NULL;
        connecttime = CONNECTTIME;
        expecttime = EXPECTTIME;

        if ((f = fopen(DEVCONFIG, "rF")) != 0) {
                while (getaline(f, buf) > 0) {
                        /* got a (logical) line from Devconfig */
                        /* strtok's of this buf continue in tokenize() */
                        tok = strtok(buf, " \t");
                        if (namematch("service=", tok, service)) {
                                tok = strtok((char *)0, " \t");
                                if (namematch("device=", tok, device)) {
                                        tokenize();
                                        nameparse();
                                }
                        }
                }
                (void) fclose(f);
        }
        return;

}

/*
 *  given a file pointer and buffer, construct logical line in buffer
 *  (i.e., concatenate lines ending in '\').  return length of line
 *  ASSUMES that buffer is BUFSIZ long!
 */

static int
getaline(FILE *f, char *line)
{       char *lptr, *lend;

        lptr = line;
        while (fgets(lptr, (line + BUFSIZ) - lptr, f) != NULL) {
                lend = lptr + strlen(lptr);
                if (lend == lptr || lend[-1] != '\n')
                        /* empty buf or line too long! */
                        break;
                *--lend = '\0'; /* lop off ending '\n' */
                if (lend == line) /* empty line - ignore */
                        continue;
                lptr = lend;
                if (lend[-1] != '\\')
                        break;
                /* continuation */
                lend[-1] = ' ';
        }
        return (lptr - line);
}

/*
 * given a label (e.g., "service=", "device="), a name ("cu", "uucico"),
 *  and a line:  if line begins with the label and if the name appears
 * in a colon-separated list of names following the label, return true;
 * else return false
 */
static int
namematch(const char *label, char *line, const char *name)
{
        char *lend;

        if (strncmp(label, line, strlen(label)) != SAME)
                return (FALSE); /* probably a comment line */
        line += strlen(label);
        if (*line == '\0')
                return (FALSE);
        /*
         * can't use strtok() in the following because scansys(),
         * scancfg() do an initializing call to strtok() before
         * coming here and then CONTINUE calling strtok() in tokenize(),
         * after returning from namematch().
         */
        while ((lend = strchr(line, ':')) != NULL) {
                *lend = '\0';
                if (strcmp(line, name) == SAME)
                        return (TRUE);
                line = lend+1;
        }
        return (strcmp(line, name) == SAME);
}

/*
 * tokenize() continues pulling tokens out of a buffer -- the
 * initializing call to strtok must have been made before calling
 * tokenize() -- and starts stuffing 'em into tokptr.
 */
static void
tokenize(void)
{
        char *tok;

        tokptr = tokens;
        while ((tok = strtok(NULL, " \t")) != NULL) {
                *tokptr++ = tok;
                if (tokptr - tokens >= NTOKENS)
                        break;
        }
        *tokptr = NULL;
}

/*
 * look at top token in array: should be line of the form
 *      name=item1:item2:item3...
 * if name is one we recognize, then call set[file|ioctl] to set up
 * corresponding list.  otherwise, log bad name.
 */
static void
nameparse(void)
{
        char **line, *equals;
        int temp;

#define setuint(a, b, c) a = (((temp = atoi(b)) <= 0) ? (c) : temp)

        for (line = tokens; (line - tokens) < NTOKENS && *line; line++) {
                equals = strchr(*line, '=');
                if (equals == NULL)
                        continue;       /* may be meaningful someday? */
                *equals = '\0';
                /* ignore entry with empty rhs */
                if (*++equals == '\0')
                        continue;
                if (strcmp(*line, "systems") == SAME)
                        setfile(Systems, equals);
                else if (strcmp(*line, "devices") == SAME)
                        setfile(Devices, equals);
                else if (strcmp(*line, "dialers") == SAME)
                        setfile(Dialers, equals);
                else if (strcmp(*line, "pop") == SAME)
                        setioctl(Pops, equals);
                else if (strcmp(*line, "push") == SAME)
                        setioctl(Pushes, equals);
                else if (strcmp(*line, "connecttime") == SAME)
                        setuint(connecttime, equals, CONNECTTIME);
                else if (strcmp(*line, "expecttime") == SAME)
                        setuint(expecttime, equals, EXPECTTIME);
                else if (strcmp(*line, "msgtime") == SAME)
                        continue;
                else {
                        char errformat[BUFSIZ];

                        (void) snprintf(errformat, sizeof (errformat),
                            "unrecognized label %s", *line);
                        logent(errformat, "Sysfiles|Devconfig");
                }
        }
}

/*
 * given the list for a particular type (systems, devices,...)
 * and a line of colon-separated files, add 'em to list
 */

static void
setfile(char **type, char *line)
{
        char **tptr, *tok;
        char expandpath[BUFSIZ];

        if (*line == 0)
                return;
        tptr = type;
        while (*tptr)           /* skip over existing entries to */
                tptr++;         /* concatenate multiple entries */

        for (tok = strtok(line, ":"); tok != NULL; tok = strtok(NULL, ":")) {
                expandpath[0] = '\0';
                if (*tok != '/')
                        /* by default, file names are relative to SYSDIR */
                        (void) snprintf(expandpath, sizeof (expandpath),
                            "%s/", SYSDIR);
                (void) strcat(expandpath, tok);
                if (eaccess(expandpath, R_OK) != 0)
                        /* if we can't read it, no point in adding to list */
                        continue;
                *tptr = strsave(expandpath);
                ASSERT(*tptr != NULL, "Ct_ALLOCATE", "setfile: tptr", 0);
                tptr++;
        }
        *tptr = NULL;
}

/*
 * given the list for a particular ioctl (push, pop)
 * and a line of colon-separated modules, add 'em to list
 */

static void
setioctl(char **type, char *line)
{
        char **tptr, *tok;

        if (*line == 0)
                return;
        tptr = type;
        while (*tptr)           /* skip over existing entries to */
                tptr++;         /* concatenate multiple entries */
        for (tok = strtok(line, ":"); tok != NULL; tok = strtok(NULL, ":")) {
                *tptr = strsave(tok);
                ASSERT(*tptr != NULL, "Ct_ALLOCATE", "setioctl: tptr", 0);
                tptr++;
        }
}

/*
 * reset Systems files
 */
static void
sysreset(void)
{
        if (fsystems)
                (void) fclose(fsystems);
        fsystems = NULL;
        nsystems = 0;
        devreset();
}

/*
 * reset Devices files
 */
static void
devreset(void)
{
        if (fdevices)
                (void) fclose(fdevices);
        fdevices = NULL;
        ndevices = 0;
        dialreset();
}

/*
 * reset Dialers files
 */
static void
dialreset(void)
{
        if (fdialers)
                (void) fclose(fdialers);
        fdialers = NULL;
        ndialers = 0;
}

/*
 * get next line from Systems file
 * return TRUE if successful, FALSE if not
 */
static int
getsysline(char *buf, int len)
{
        if (Systems[0] == NULL)
                /* not initialized via setservice() - use default */
                setservice("uucico");

        /* initialize devices and dialers whenever a new line is read */
        /* from systems */
        devreset();
        if (fsystems == NULL)
                if (nextsystems() == FALSE)
                        return (FALSE);

        for (;;) {
                while (fgets(buf, len, fsystems) != NULL)
                        if ((*buf != '#') && (*buf != ' ') &&
                            (*buf != '\t') && (*buf != '\n'))
                        return (TRUE);
                if (nextsystems() == FALSE)
                        return (FALSE);
        }
}

/*
 * move to next systems file.  return TRUE if successful, FALSE if not
 */
static int
nextsystems(void)
{
        devreset();

        if (fsystems != NULL) {
                (void) fclose(fsystems);
                nsystems++;
        } else {
                nsystems = 0;
        }
        for (; Systems[nsystems] != NULL; nsystems++)
                if ((fsystems = fopen(Systems[nsystems], "rF")) != NULL)
                        return (TRUE);
        return (FALSE);
}

/*
 * get next line from Devices file
 * return TRUE if successful, FALSE if not
 */
static int
getdevline(char *buf, int len)
{
        if (Devices[0] == NULL)
                /* not initialized via setservice() - use default */
                setservice("uucico");

        if (fdevices == NULL)
                if (nextdevices() == FALSE)
                        return (FALSE);
        for (;;) {
                if (fgets(buf, len, fdevices) != NULL)
                        return (TRUE);
                if (nextdevices() == FALSE)
                        return (FALSE);
        }
}

/*
 * move to next devices file.  return TRUE if successful, FALSE if not
 */
static int
nextdevices(void)
{
        if (fdevices != NULL) {
                (void) fclose(fdevices);
                ndevices++;
        } else {
                ndevices = 0;
        }
        for (; Devices[ndevices] != NULL; ndevices++)
                if ((fdevices = fopen(Devices[ndevices], "rF")) != NULL)
                        return (TRUE);
        return (FALSE);
}


/*
 * get next line from Dialers file
 * return TRUE if successful, FALSE if not
 */

static int
getdialline(char *buf, int len)
{
        if (Dialers[0] == NULL)
                /* not initialized via setservice() - use default */
                setservice("uucico");

        if (fdialers == NULL)
                if (nextdialers() == FALSE)
                        return (FALSE);
        for (;;) {
                if (fgets(buf, len, fdialers) != NULL)
                        return (TRUE);
                if (nextdialers() == FALSE)
                        return (FALSE);
        }
}

/*
 * move to next dialers file.  return TRUE if successful, FALSE if not
 */
static int
nextdialers(void)
{
        if (fdialers) {
                (void) fclose(fdialers);
                ndialers++;
        } else {
                ndialers = 0;
        }

        for (; Dialers[ndialers] != NULL; ndialers++)
                if ((fdialers = fopen(Dialers[ndialers], "rF")) != NULL)
                        return (TRUE);
        return (FALSE);
}

/*
 * get next module to be popped
 * return TRUE if successful, FALSE if not
 */
static int
getpop(char *buf, size_t len, int *optional)
{
        int slen;

        if (Pops[0] == NULL || Pops[npops] == NULL)
                return (FALSE);

        /*      if the module name is enclosed in parentheses,  */
        /*      is optional. set flag & strip parens            */
        slen = strlen(Pops[npops]) - 1;
        if (Pops[npops][0] == '(' && Pops[npops][slen] == ')') {
                *optional = 1;
                len = (slen < len ? slen : len);
                (void) strncpy(buf, &(Pops[npops++][1]), len);
        } else {
                *optional = 0;
                (void) strncpy(buf, Pops[npops++], len);
        }
        buf[len-1] = '\0';
        return (TRUE);
}

/*
 * get next module to be pushed
 * return TRUE if successful, FALSE if not
 */
static int
getpush(char *buf, size_t len)
{
        if (Pushes[0] == NULL || Pushes[npushes] == NULL)
                return (FALSE);
        (void) strncpy(buf, Pushes[npushes++], len);
        return (TRUE);
}

/*
 * pop/push requested modules
 * return TRUE if successful, FALSE if not
 */
static int
pop_push(int fd)
{
        char    strmod[FMNAMESZ], onstream[FMNAMESZ];
        int             optional;

        /*      check for streams modules to pop        */
        while (getpop(strmod, sizeof (strmod), &optional)) {
                DEBUG(5, (optional ?
                    (const char *)"pop_push: optionally POPing %s\n" :
                    (const char *)"pop_push: POPing %s\n"), strmod);
                if (ioctl(fd, I_LOOK, onstream) == -1) {
                        DEBUG(5, "pop_push: I_LOOK on fd %d failed ", fd);
                        DEBUG(5, "errno %d\n", errno);
                        return (FALSE);
                }
                if (strcmp(strmod, onstream) != SAME) {
                        if (optional)
                                continue;
                        DEBUG(5, "pop_push: I_POP: %s not there\n", strmod);
                        return (FALSE);
                }
                if (ioctl(fd, I_POP, 0) == -1) {
                        DEBUG(5, "pop_push: I_POP on fd %d failed ", fd);
                        DEBUG(5, "errno %d\n", errno);
                        return (FALSE);
                }
        }

        /*      check for streams modules to push       */
        while (getpush(strmod, sizeof (strmod))) {
                DEBUG(5, "pop_push: PUSHing %s\n", strmod);
                if (ioctl(fd, I_PUSH, strmod) == -1) {
                        DEBUG(5, "pop_push: I_PUSH on fd %d failed ", fd);
                        DEBUG(5, "errno %d\n", errno);
                        return (FALSE);
                }
        }
        return (TRUE);
}

#ifndef SMALL
/*
 *      return name of currently open Systems file
 */
static char *
currsys(void)
{
        return (Systems[nsystems]);
}

/*
 *      return name of currently open Devices file
 */
static char *
currdev(void)
{
        return (Devices[ndevices]);
}

/*
 *      return name of currently open Dialers file
 */
static char *
currdial(void)
{
        return (Dialers[ndialers]);
}
#endif

/*
 * set configuration parameters provided in Config file
 */
static void
setconfig(void)
{
        FILE *f;
        char buf[BUFSIZ];
        char *tok;
        extern char _ProtoCfg[];

        if ((f = fopen(CONFIG, "rF")) != 0) {
        while (getaline(f, buf) > 0) {
                /* got a (logical) line from Config file */
                tok = strtok(buf, " \t");
                if ((tok != NULL) && (*tok != '#')) {
                        /* got a token */
                        /*
                         * this probably should be table driven when
                         * the list of configurable parameters grows.
                         */
                        if (strncmp("Protocol=", tok, strlen("Protocol=")) ==
                            SAME) {
                                tok += strlen("Protocol=");
                                if (*tok != '\0') {
                                        if (_ProtoCfg[0] != '\0') {
                                                /*EMPTY*/
                                                DEBUG(7, "Protocol string %s ",
                                                    tok);
                                                DEBUG(7, "overrides %s\n",
                                                    _ProtoCfg);
                                        }
                                        (void) strcpy(_ProtoCfg, tok);
                                }
                        } else {
                                /*EMPTY*/
                                DEBUG(7, "Unknown configuration parameter %s\n",
                                    tok);
                        }
                }
        }
        (void) fclose(f);
        }
}