vacm_vars.c

来自「eCos操作系统源码」· C语言 代码 · 共 1,195 行 · 第 1/3 页

    gp = vacm_getGroupEntry(pdu->securityModel, sn);
    if (gp == NULL) { DEBUGMSG(("mibII/vacm_vars", "\n")); return 2; }
    DEBUGMSG (("mibII/vacm_vars", ", gn=%s", gp->groupName));

    ap = vacm_getAccessEntry(gp->groupName, "", pdu->securityModel,
                             pdu->securityLevel);
    if (ap == NULL) { DEBUGMSG(("mibII/vacm_vars", "\n")); return 3; }

    if (name == 0) { /* only check the setup of the vacm for the request */
        DEBUGMSG(("mibII/vacm_vars", ", Done checking setup\n"));
        return 0;
    }

    switch (pdu->command) {
      case SNMP_MSG_GET:
      case SNMP_MSG_GETNEXT:
      case SNMP_MSG_GETBULK:
	vn = ap->readView;
	break;
      case SNMP_MSG_SET:
	vn = ap->writeView;
	break;
      case SNMP_MSG_TRAP:
      case SNMP_MSG_TRAP2:
      case SNMP_MSG_INFORM:
	vn = ap->notifyView;
	break;
      default:
        snmp_log(LOG_ERR, "bad msg type in vacm_in_view: %d\n", pdu->command);
	vn = ap->readView;
    }
    DEBUGMSG (("mibII/vacm_vars", ", vn=%s", vn));

    vp = vacm_getViewEntry (vn, name, namelen);
    if (vp == NULL) { DEBUGMSG(("mibII/vacm_vars", "\n")); return 4; }
    DEBUGMSG(("mibII/vacm_vars", ", vt=%d\n", vp->viewType));
    if (vp->viewType == SNMP_VIEW_EXCLUDED) return 5;

    return 0;

}  /* end vacm_in_view() */


u_char *var_vacm_sec2group(struct variable *vp,
			   oid *name,
			   size_t *length,
			   int exact,
			   size_t *var_len,
			   WriteMethod **write_method)
{
    struct vacm_groupEntry *gp;
    oid *groupSubtree;
    int groupSubtreeLen;
    int secmodel;
    char secname[32], *cp;

    write_method = NULL;
    if (memcmp(name, vp->name, sizeof(oid)*vp->namelen) != 0) {
	memcpy(name, vp->name, sizeof(oid)*vp->namelen);
	*length = vp->namelen;
    }
    if (exact) {
	if (*length < 13) return NULL;

	secmodel = name[11];
	groupSubtree = name+13;
	groupSubtreeLen = *length - 13;
	cp = secname;
	while (groupSubtreeLen-- > 0) {
            if (*groupSubtree > 255)
              return 0; /* illegal value */
	    *cp++ = (char) *groupSubtree++;
	}
	*cp = 0;

	gp = vacm_getGroupEntry(secmodel, secname);
    }
    else {
	secmodel = *length > 11 ? name[11] : 0;
	groupSubtree = name+12;
	groupSubtreeLen = *length - 12;
	cp = secname;
	while (groupSubtreeLen-- > 0) {
            if (*groupSubtree > 255)
              return 0; /* illegal value */
	    *cp++ = (char) *groupSubtree++;
	}
	*cp = 0;
	vacm_scanGroupInit();
	while ((gp = vacm_scanGroupNext()) != NULL) {
	    if (gp->securityModel > secmodel ||
		(gp->securityModel == secmodel && strcmp(gp->securityName, secname) > 0))
		break;
	}
	if (gp) {
	    name[11] = gp->securityModel;
	    *length = 12;
	    cp = gp->securityName;
	    while (*cp) {
		name[(*length)++] = *cp++;
	    }
	}
    }

    if (!gp) return NULL;

    *var_len =sizeof(long_return);
    switch (vp->magic) {
    case SECURITYMODEL:
	long_return = gp->securityModel;
	return (u_char *)&long_return;
    case SECURITYNAME:
	*var_len = gp->securityName[0];
	return (u_char *)&gp->securityName[1];
    case SECURITYGROUP:
	*var_len = strlen(gp->groupName);
	return (u_char *)gp->groupName;
    case SECURITYSTORAGE:
	long_return = gp->storageType;
	return (u_char *)&long_return;
    case SECURITYSTATUS:
	long_return = gp->status;
	return (u_char *)&long_return;
    }
    return NULL;
}

u_char *var_vacm_access(struct variable *vp,
			oid *name,
			size_t *length,
			int exact,
			size_t *var_len,
			WriteMethod **write_method)
{
    struct vacm_accessEntry *gp;
    int secmodel;
    int seclevel;
    char groupName[32];
    char contextPrefix[32];
    oid *op;
    int len;
    char *cp;
    int cmp;

    write_method = NULL;
    if (memcmp(name, vp->name, sizeof(oid)*vp->namelen) != 0) {
	memcpy(name, vp->name, sizeof(oid)*vp->namelen);
	*length = vp->namelen;
    }
    if (exact) {
	if (*length < 15) return NULL;

	op = name+11;
	len = *op++;
	cp = groupName;
	while (len-- > 0) {
            if (*op > 255)
              return 0; /* illegal value */
	    *cp++ = (char) *op++;
	}
	*cp = 0;
	len = *op++;
	cp = contextPrefix;
	while (len-- > 0) {
            if (*op > 255)
              return 0; /* illegal value */
	    *cp++ = (char) *op++;
	}
	*cp = 0;
	secmodel = *op++;
	seclevel = *op++;
	if (op != name + *length) {
	    return NULL;
	}

	gp = vacm_getAccessEntry(groupName, contextPrefix, secmodel, seclevel);
    }
    else {
	secmodel = seclevel = 0;
	groupName[0] = 0;
	contextPrefix[0] = 0;
	op = name+11;
	if (op >= name + *length) {
	}
	else {
	    len = *op;
	    cp = groupName;
	    while (len-- >= 0) {
                if (*op > 255)
                  return 0; /* illegal value */
		*cp++ = (char) *op++;
	    }
	    *cp = 0;
	}
	if (op >= name + *length) {
	}
	else {
	    len = *op;
	    cp = contextPrefix;
	    while (len-- >= 0) {
                if (*op > 255)
                  return 0; /* illegal value */
		*cp++ = (char) *op++;
	    }
	    *cp = 0;
	}
	if (op >= name + *length) {
	}
	else {
	    secmodel = *op++;
	}
	if (op >= name + *length) {
	}
	else {
	    seclevel = *op++;
	}
	vacm_scanAccessInit();
	while ((gp = vacm_scanAccessNext()) != NULL) {
	    cmp = strcmp(gp->groupName, groupName);
	    if (cmp > 0) break;
	    if (cmp < 0) continue;
	    cmp = strcmp(gp->contextPrefix, contextPrefix);
	    if (cmp > 0) break;
	    if (cmp < 0) continue;
	    if (gp->securityModel > secmodel) break;
	    if (gp->securityModel < secmodel) continue;
	    if (gp->securityLevel > seclevel) break;
	}
	if (gp) {
	    *length = 11;
	    cp = gp->groupName;
	    do {
		name[(*length)++] = *cp++;
	    } while (*cp);
	    cp = gp->contextPrefix;
	    do {
		name[(*length)++] = *cp++;
	    } while (*cp);
	    name[(*length)++] = gp->securityModel;
	    name[(*length)++] = gp->securityLevel;
	}
    }

    if (!gp) return NULL;

    *var_len =sizeof(long_return);
    switch (vp->magic) {
    case ACCESSMATCH:
	long_return = gp->contextMatch;
	return (u_char *)&long_return;
    case ACCESSLEVEL:
	long_return = gp->securityLevel;
	return (u_char *)&long_return;
    case ACCESSMODEL:
	long_return = gp->securityModel;
	return (u_char *)&long_return;
    case ACCESSPREFIX:
	*var_len = *gp->contextPrefix;
	return (u_char *)&gp->contextPrefix[1];
    case ACCESSREAD:
	*var_len = strlen(gp->readView);
	return (u_char *)gp->readView;
    case ACCESSWRITE:
	*var_len = strlen(gp->writeView);
	return (u_char *)gp->writeView;
    case ACCESSNOTIFY:
	*var_len = strlen(gp->notifyView);
	return (u_char *)gp->notifyView;
    case ACCESSSTORAGE:
	long_return = gp->storageType;
	return (u_char *)&long_return;
    case ACCESSSTATUS:
	long_return = gp->status;
	return (u_char *)&long_return;
    }
    return NULL;
}

u_char *var_vacm_view(struct variable *vp,
		      oid *name,
		      size_t *length,
		      int exact,
		      size_t *var_len,
		      WriteMethod **write_method)
{
    struct vacm_viewEntry *gp;
    char viewName[32];
    oid subtree[MAX_OID_LEN];
    size_t subtreeLen = 0;
    oid *op, *op1;
    int len;
    char *cp;
    int cmp;

    write_method = NULL;
    if (memcmp(name, vp->name, sizeof(oid)*vp->namelen) != 0) {
	memcpy(name, vp->name, sizeof(oid)*vp->namelen);
	*length = vp->namelen;
    }
    if (exact) {
	if (*length < 15) return NULL;

	op = name+12;
	len = *op++;
	cp = viewName;
	while (len-- > 0) {
            if (*op > 255)
              return 0; /* illegal value */
	    *cp++ = (char) *op++;
	}
	*cp = 0;
	len = *length - (op - name);
	op1 = subtree;
	while (len-- > 0) {
	    *op1++ = *op++;
	    subtreeLen++;
	}
	if (op != name + *length) {
	    return NULL;
	}

	gp = vacm_getViewEntry(viewName, subtree, subtreeLen);
    }
    else {
	viewName[0] = 0;
	op = name+12;
	if (op >= name + *length) {
	}
	else {
	    len = *op;
	    cp = viewName;
	    while (len-- >= 0) {
                if (*op > 255)
                  return 0; /* illegal value */
		*cp++ = (char) *op++;
	    }
	    *cp = 0;
	}
	if (op >= name + *length) {
	}
	else {
	    len = *length - (op - name);
	    op1 = subtree;
	    while (len-- >= 0) {
		*op1++ = *op++;
		subtreeLen++;
	    }
	}
	vacm_scanViewInit();
	while ((gp = vacm_scanViewNext()) != NULL) {
	    cmp = strcmp(gp->viewName, viewName);
	    if (cmp > 0) break;
	    if (cmp < 0) continue;
	}
	if (gp) {
	    *length = 12;
	    cp = gp->viewName;
	    do {
		name[(*length)++] = *cp++;
	    } while (*cp);
	    op1 = gp->viewSubtree;
	    len = gp->viewSubtreeLen;
	    do {
		name[(*length)++] = *op1++;
	    } while (len-- > 0);
	}
    }

    if (!gp) return NULL;

    *var_len =sizeof(long_return);
    switch (vp->magic) {
    case VIEWNAME:
	*var_len = gp->viewName[0];
	return (u_char *)&gp->viewName[1];
    case VIEWSUBTREE:
	*var_len = gp->viewSubtreeLen*sizeof(oid);
	return (u_char *)gp->viewSubtree;
    case VIEWMASK:
	*var_len = (gp->viewSubtreeLen + 7) / 8;
	return (u_char *)gp->viewMask;
    case VIEWTYPE:
	long_return = gp->viewType;
	return (u_char *)&long_return;
    case VIEWSTORAGE:
	long_return = gp->viewStorageType;
	return (u_char *)&long_return;
    case VIEWSTATUS:
	long_return = gp->viewStatus;
	return (u_char *)&long_return;
    }
    return NULL;
}

#endif /* CYGPKG_SNMPLIB_FILESYSTEM_SUPPORT */
#endif /* CYGPKG_SNMPAGENT_V3_SUPPORT */