netnamer.c File Reference

#include <wintirpc.h>
#include <sys/param.h>
#include <rpc/rpc.h>
#include "rpc_com.h"
#include <ctype.h>
#include <stdio.h>
#include <grp.h>
#include <pwd.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>

Include dependency graph for netnamer.c:

Go to the source code of this file.

Macros
#define	NGROUPS   16

Functions
static int	getnetid (char *, char *)
static int	_getgroups (char *, gid_t *)
int	netname2user (netname, uid_t *uidp, gid_t *gidp, int *gidlenp, gid_t *gidlist)
static int	_getgroups (char *uname, groups)
int	netname2host (netname, char *hostname, int hostlen)

Variables
static char *	OPSYS = "unix"
static char *	NETID = "netid.byname"
static char *	NETIDFILE = "/etc/netid"

Macro Definition Documentation

NGROUPS

#define NGROUPS   16

Definition at line 60 of file netnamer.c.

Function Documentation

_getgroups() [1/2]

static int _getgroups ( char *  , gid_t *    )

static

Referenced by netname2user().

_getgroups() [2/2]

static int _getgroups ( char *  uname, groups    )

static

Definition at line 149 of file netnamer.c.

{
    gid_t           ngroups = 0;
    struct group *grp;
    int    i;
    int    j;
    int             filter;

    setgrent();
    while ((grp = getgrent())) {
        for (i = 0; grp->gr_mem[i]; i++)
            if (!strcmp(grp->gr_mem[i], uname)) {
                if (ngroups == NGROUPS) {
#ifdef DEBUG
                    fprintf(stderr,
                "initgroups: %s is in too many groups\n", uname);
#endif
                    goto toomany;
                }
                /* filter out duplicate group entries */
                filter = 0;
                for (j = 0; j < ngroups; j++)
                    if (groups[j] == grp->gr_gid) {
                        filter++;
                        break;
                    }
                if (!filter)
                    groups[ngroups++] = grp->gr_gid;
            }
    }
toomany:
    endgrent();
    return (ngroups);
}

getnetid()

int getnetid ( char *  key, char *  ret  )

static

Definition at line 239 of file netnamer.c.

{
    char            buf[1024];  /* big enough */
    char           *res;
    char           *mkey;
    char           *mval;
    FILE           *fd;
#ifdef YP
    char           *domain;
    int             err;
    char           *lookup;
    int             len;
#endif

    fd = fopen(NETIDFILE, "r");
    if (fd == NULL) {
#ifdef YP
        res = "+";
        goto getnetidyp;
#else
        return (0);
#endif
    }
    for (;;) {
        if (fd == NULL)
            return (0); /* getnetidyp brings us here */
        res = fgets(buf, sizeof(buf), fd);
        if (res == NULL) {
            fclose(fd);
            return (0);
        }
        if (res[0] == '#')
            continue;
        else if (res[0] == '+') {
#ifdef YP
    getnetidyp:
            err = yp_get_default_domain(&domain);
            if (err) {
                continue;
            }
            lookup = NULL;
            err = yp_match(domain, NETID, key,
                strlen(key), &lookup, &len);
            if (err) {
#ifdef DEBUG
                fprintf(stderr, "match failed error %d\n", err);
#endif
                continue;
            }
            lookup[len] = 0;
            strcpy(ret, lookup);
            free(lookup);
            if (fd != NULL)
                fclose(fd);
            return (2);
#else   /* YP */
#ifdef DEBUG
            fprintf(stderr,
"Bad record in %s '+' -- NIS not supported in this library copy\n",
                NETIDFILE);
#endif
            continue;
#endif  /* YP */
        } else {
            mkey = strsep(&res, "\t ");
            if (mkey == NULL) {
                fprintf(stderr,
        "Bad record in %s -- %s", NETIDFILE, buf);
                continue;
            }
            do {
                mval = strsep(&res, " \t#\n");
            } while (mval != NULL && !*mval);
            if (mval == NULL) {
                fprintf(stderr,
        "Bad record in %s val problem - %s", NETIDFILE, buf);
                continue;
            }
            if (strcmp(mkey, key) == 0) {
                strcpy(ret, mval);
                fclose(fd);
                return (1);

            }
        }
    }
}

Referenced by netname2host(), and netname2user().

netname2host()

int netname2host	(	netname	,
		char *	hostname,
		int	hostlen
	)

Definition at line 190 of file netnamer.c.

{
    int             err;
    char            valbuf[1024];
    char           *val;
    char           *val2;
    int             vallen;
    char           *domain;

    if (getnetid(netname, valbuf)) {
        val = valbuf;
        if ((*val == '0') && (val[1] == ':')) {
            (void) strncpy(hostname, val + 2, hostlen);
            return (1);
        }
    }
    val = strchr(netname, '.');
    if (val == NULL)
        return (0);
    if (strncmp(netname, OPSYS, (val - netname)))
        return (0);
    val++;
    val2 = strchr(val, '@');
    if (val2 == NULL)
        return (0);
    vallen = val2 - val;
    if (vallen > (hostlen - 1))
        vallen = hostlen - 1;
    (void) strncpy(hostname, val, vallen);
    hostname[vallen] = 0;

    err = __rpc_get_default_domain(&domain);    /* change to rpc */
    if (err)
        return (0);

    if (strcmp(val2 + 1, domain))
        return (0); /* wrong domain */
    else
        return (1);
}

netname2user()

int netname2user	(	netname	,
		uid_t *	uidp,
		gid_t *	gidp,
		int *	gidlenp,
		gid_t *	gidlist
	)

Definition at line 67 of file netnamer.c.

{
    char           *p;
    int             gidlen;
    uid_t           uid;
    long        luid;
    struct passwd  *pwd;
    char            val[1024];
    char           *val1, *val2;
    char           *domain;
    int             vallen;
    int             err;

    if (getnetid(netname, val)) {
        char *res = val;

        p = strsep(&res, ":");
        if (p == NULL)
            return (0);
        *uidp = (uid_t) atol(p);
        p = strsep(&res, "\n,");
        if (p == NULL) {
            return (0);
        }
        *gidp = (gid_t) atol(p);
        gidlen = 0;
        for (gidlen = 0; gidlen < NGROUPS; gidlen++) {
            p = strsep(&res, "\n,");
            if (p == NULL)
                break;
            gidlist[gidlen] = (gid_t) atol(p);
        }
        *gidlenp = gidlen;

        return (1);
    }
    val1 = strchr(netname, '.');
    if (val1 == NULL)
        return (0);
    if (strncmp(netname, OPSYS, (val1-netname)))
        return (0);
    val1++;
    val2 = strchr(val1, '@');
    if (val2 == NULL)
        return (0);
    vallen = val2 - val1;
    if (vallen > (1024 - 1))
        vallen = 1024 - 1;
    (void) strncpy(val, val1, 1024);
    val[vallen] = 0;

    err = __rpc_get_default_domain(&domain);    /* change to rpc */
    if (err)
        return (0);

    if (strcmp(val2 + 1, domain))
        return (0); /* wrong domain */

    if (sscanf(val, "%ld", &luid) != 1)
        return (0);
    uid = luid;

    /* use initgroups method */
    pwd = getpwuid(uid);
    if (pwd == NULL)
        return (0);
    *uidp = pwd->pw_uid;
    *gidp = pwd->pw_gid;
    *gidlenp = _getgroups(pwd->pw_name, gidlist);
    return (1);
}

Variable Documentation

NETID

char* NETID = "netid.byname"

static

Definition at line 53 of file netnamer.c.

Referenced by getnetid().

NETIDFILE

char* NETIDFILE = "/etc/netid"

static

Definition at line 54 of file netnamer.c.

Referenced by getnetid().

OPSYS

char* OPSYS = "unix"

static

Definition at line 52 of file netnamer.c.

Referenced by netname2host(), and netname2user().