* Enhanced Clixon if-feature handling:
* If-feature now supports and/or lists, such as: `if-feature "a and b"` and `if-feature "a or b or c"`. However, full if-feature-expr including `not` and nested boolean experessions is still not supported. * Sanity check: if an `if-feature` statement exists, a corresponding `feature` statement must exists that declares that feature.
This commit is contained in:
Olof hagsand
parent
cb58b2bb12
commit
f7b640810b
3 changed files with 274 additions and 47 deletions
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@ -2064,14 +2064,156 @@ ys_populate2(yang_stmt *ys,
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return retval;
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}
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/*! Handle complexity of if-feature node
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* @param[in] h Clixon handle
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* @param[in] ys Yang if-feature statement
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* @retval -1 Error
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* @retval 0 Feature not enabled: remove yt
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* @retval 1 OK
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* @note if-feature syntax is restricted to single, and, or, syntax, such as "a or b"
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* but RFC7950 allows for nested expr/term/factor syntax.
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*/
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static int
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yang_if_feature(clicon_handle h,
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yang_stmt *ys)
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{
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int retval = -1;
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char **vec = NULL;
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int nvec;
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char *f;
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int i;
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char *prefix = NULL;
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char *feature = NULL;
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yang_stmt *ymod; /* module yang node */
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yang_stmt *yfeat; /* feature yang node */
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int opand = -1; /* -1:not set, 0:or, 1:and */
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int enabled = 0;
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if ((vec = clicon_strsep(ys->ys_argument, " \t", &nvec)) == NULL)
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goto done;
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if (nvec%2 == 0){ /* Must be odd: eg a / "a or b" etc */
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clicon_err(OE_YANG, EINVAL, "Syntax error IF_FEATURE \"%s\" (only single if-feature-expr and/or lists allowed)", ys->ys_argument);
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goto done;
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}
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/* Two steps: first detect operators
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* Step 1: support "a" or "a or b or c" or "a and b and c "
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*/
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for (i=0; i<nvec; i++){
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if (i%2==0) /* only keep odd i:s 1,3,... */
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continue;
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f = vec[i];
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/* odd i: operator "and" or "or" */
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if (strcmp(f, "or") == 0){
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switch (opand){
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case -1:
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if (i != 1){
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clicon_err(OE_YANG, EINVAL, "Syntax error IF_FEATURE \"%s\" (only single if-feature-expr and/or lists allowed)", ys->ys_argument);
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goto done;
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}
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opand = 0;
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break;
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case 0:
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break;
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case 1:
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clicon_err(OE_YANG, EINVAL, "Syntax error IF_FEATURE \"%s\" (only single if-feature-expr and/or lists allowed)", ys->ys_argument);
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goto done;
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break;
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}
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}
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else if (strcmp(f, "and") == 0){
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switch (opand){
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case -1:
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if (i != 1){
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clicon_err(OE_YANG, EINVAL, "Syntax error IF_FEATURE \"%s\" (only single if-feature-expr and/or lists allowed)", ys->ys_argument);
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goto done;
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}
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opand = 1;
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break;
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case 0:
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clicon_err(OE_YANG, EINVAL, "Syntax error IF_FEATURE \"%s\" (only single if-feature-expr and/or lists allowed)", ys->ys_argument);
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goto done;
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break;
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case 1:
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break;
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}
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}
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else{
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clicon_err(OE_YANG, EINVAL, "Syntax error IF_FEATURE \"%s\" (only single if-feature-expr and/or lists allowed)", ys->ys_argument);
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goto done;
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}
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} /* for step 1 */
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if (opand == -1) /* Uninitialized means single operand */
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opand = 1;
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if (opand) /* if AND, start as enabled, if OR start as disabled */
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enabled = 1;
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else
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enabled = 0;
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/* Step 2: Boolean operations on operands */
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for (i=0; i<nvec; i++){
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if (i%2==1) /* only keep even i:s 0,2,... */
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continue;
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f = vec[i];
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if (nodeid_split(f, &prefix, &feature) < 0)
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goto done;
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/* Specifically need to handle? strcmp(prefix, myprefix)) */
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if (prefix == NULL)
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ymod = ys_module(ys);
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else
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ymod = yang_find_module_by_prefix(ys, prefix);
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/* Check if feature exists, and is set, otherwise remove */
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if ((yfeat = yang_find(ymod, Y_FEATURE, feature)) == NULL){
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clicon_err(OE_YANG, EINVAL, "Yang module %s has IF_FEATURE %s, but no such FEATURE statement exists",
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ymod?yang_argument_get(ymod):"none",
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feature);
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goto done;
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}
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/* Check if this feature is enabled or not
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* Continue loop to catch unbound features and make verdict at end
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*/
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if (yfeat->ys_cv == NULL || !cv_bool_get(yfeat->ys_cv)){ /* disabled */
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/* if AND then this is permanently disabled */
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if (opand && enabled)
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enabled = 0;
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}
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else{ /* enabled */
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/* if OR then this is permanently enabled */
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if (!opand && !enabled)
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enabled = 1;
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}
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if (prefix){
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free(prefix);
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prefix = NULL;
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}
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if (feature){
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free(feature);
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feature = NULL;
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}
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}
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if (!enabled)
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goto disabled;
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retval = 1;
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done:
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if (vec)
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free(vec);
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if (prefix)
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free(prefix);
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if (feature)
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free(feature);
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return retval;
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disabled:
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retval = 0; /* feature not enabled */
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goto done;
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}
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/*! Find feature and if-feature nodes, check features and remove disabled nodes
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* @param[in] h CLICON handle
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* @param[in] h Clixon handle
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* @param[in] yt Yang statement
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* @retval -1 Error
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* @retval 0 Feature not enabled: remove yt
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* @retval 1 OK
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* @note On return 1 the over-lying function need to remove yt from its parent
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* @note cannot use yang_apply here since child-list is modified (destructive)
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* @note if-feature syntax is restricted to single, and, or, syntax, such as "a or b"
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*/
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int
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yang_features(clicon_handle h,
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@ -2081,37 +2223,16 @@ yang_features(clicon_handle h,
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int i;
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int j;
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yang_stmt *ys = NULL;
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char *prefix = NULL;
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char *feature = NULL;
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yang_stmt *ymod; /* module yang node */
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yang_stmt *yfeat; /* feature yang node */
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int ret;
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i = 0;
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while (i<yt->ys_len){ /* Note, children may be removed */
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ys = yt->ys_stmt[i];
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if (ys->ys_keyword == Y_IF_FEATURE){
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if (nodeid_split(ys->ys_argument, &prefix, &feature) < 0)
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if ((ret = yang_if_feature(h, ys)) < 0)
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goto done;
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/* Specifically need to handle? strcmp(prefix, myprefix)) */
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if (prefix == NULL)
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ymod = ys_module(ys);
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else
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ymod = yang_find_module_by_prefix(yt, prefix);
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/* Check if feature exists, and is set, otherwise remove */
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if ((yfeat = yang_find(ymod, Y_FEATURE, feature)) == NULL ||
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yfeat->ys_cv == NULL || !cv_bool_get(yfeat->ys_cv)){
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retval = 0; /* feature not enabled */
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goto done;
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}
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if (prefix){
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free(prefix);
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prefix = NULL;
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}
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if (feature){
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free(feature);
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feature = NULL;
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}
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if (ret == 0)
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goto disabled;
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}
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else
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if (ys->ys_keyword == Y_FEATURE){
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@ -2136,11 +2257,10 @@ yang_features(clicon_handle h,
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}
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retval = 1;
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done:
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if (prefix)
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free(prefix);
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if (feature)
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free(feature);
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return retval;
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disabled:
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retval = 0; /* feature not enabled */
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goto done;
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}
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/*! Apply a function call recursively on all yang-stmt s recursively
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