MINOR: args: implement a new arg type for regex : ARGT_REG

This one will be used when a regex is expected. It is automatically
resolved after the parsing and compiled into a regex. Some optional
flags are supported in the type-specific flags that should be set by
the optional arg checker. One is used during the regex compilation :
ARGF_REG_ICASE to ignore case.

include/types/arg.h

@@ -57,6 +57,7 @@ enum {
 	ARGT_SRV,      /* a pointer to a server */
 	ARGT_USR,      /* a pointer to a user list */
 	ARGT_MAP,      /* a pointer to a map descriptor */
+	ARGT_REG,      /* a pointer to a regex */
 };
 
 /* context where arguments are used, in order to help error reporting */
@@ -72,10 +73,15 @@ enum {
 	ARGC_CAP,      /* capture rule */
 };
 
+/* flags used when compiling and executing regex */
+#define ARGF_REG_ICASE 1
+#define ARGF_REG_GLOB  2
+
 /* some types that are externally defined */
 struct proxy;
 struct server;
 struct userlist;
+struct my_regex;
 
 union arg_data {
 	unsigned int uint; /* used for uint, time, size */
@@ -87,6 +93,7 @@ union arg_data {
 	struct server *srv;
 	struct userlist *usr;
 	struct map_descriptor *map;
+	struct my_regex *reg;
 };
 
 struct arg {

src/arg.c

@@ -34,6 +34,7 @@ static const char *arg_type_names[ARGT_NBTYPES] = {
 	[ARGT_SRV]  = "server",
 	[ARGT_USR]  = "user list",
 	[ARGT_MAP]  = "map",
+	[ARGT_REG]  = "regex",
 	/* Unassigned types must never happen. Better crash during parsing if they do. */
 };
 
@@ -173,6 +174,7 @@ int make_arg_list(const char *in, int len, unsigned int mask, struct arg **argp,
 		case ARGT_TAB:
 		case ARGT_SRV:
 		case ARGT_USR:
+		case ARGT_REG:
 			/* These argument types need to be stored as strings during
 			 * parsing then resolved later.
 			 */

src/haproxy.c

@@ -1086,6 +1086,13 @@ static void deinit_sample_arg(struct arg *p)
 			p->data.str.str = NULL;
 			p->unresolved = 0;
 		}
+		else if (p->type == ARGT_REG) {
+			if (p->data.reg) {
+				regex_free(p->data.reg);
+				free(p->data.reg);
+				p->data.reg = NULL;
+			}
+		}
 		p++;
 	}
 

src/sample.c

@@ -983,13 +983,16 @@ int smp_resolve_args(struct proxy *p)
 	const char *ctx, *where;
 	const char *conv_ctx, *conv_pre, *conv_pos;
 	struct userlist *ul;
+	struct my_regex *reg;
 	struct arg *arg;
 	int cfgerr = 0;
+	int rflags;
 
 	list_for_each_entry_safe(cur, bak, &p->conf.args.list, list) {
 		struct proxy *px;
 		struct server *srv;
 		char *pname, *sname;
+		char *err;
 
 		arg = cur->arg;
 
@@ -1004,7 +1007,7 @@ int smp_resolve_args(struct proxy *p)
 		where = "in";
 		ctx = "sample fetch keyword";
 		switch (cur->ctx) {
-		case ARGC_STK:where = "in stick rule in"; break;
+		case ARGC_STK: where = "in stick rule in"; break;
 		case ARGC_TRK: where = "in tracking rule in"; break;
 		case ARGC_LOG: where = "in log-format string in"; break;
 		case ARGC_HRQ: where = "in http-request header format string in"; break;
@@ -1175,6 +1178,45 @@ int smp_resolve_args(struct proxy *p)
 			arg->unresolved = 0;
 			arg->data.usr = ul;
 			break;
+
+		case ARGT_REG:
+			if (!arg->data.str.len) {
+				Alert("parsing [%s:%d] : missing regex in arg %d of %s%s%s%s '%s' %s proxy '%s'.\n",
+				      cur->file, cur->line,
+				      cur->arg_pos + 1, conv_pre, conv_ctx, conv_pos, ctx, cur->kw, where, p->id);
+				cfgerr++;
+				continue;
+			}
+
+			reg = calloc(1, sizeof(*reg));
+			if (!reg) {
+				Alert("parsing [%s:%d] : not enough memory to build regex in arg %d of %s%s%s%s '%s' %s proxy '%s'.\n",
+				      cur->file, cur->line,
+				      cur->arg_pos + 1, conv_pre, conv_ctx, conv_pos, ctx, cur->kw, where, p->id);
+				cfgerr++;
+				continue;
+			}
+
+			rflags = 0;
+			rflags |= (arg->type_flags & ARGF_REG_ICASE) ? REG_ICASE : 0;
+			err = NULL;
+
+			if (!regex_comp(arg->data.str.str, reg, rflags, 1 /* capture substr */, &err)) {
+				Alert("parsing [%s:%d] : error in regex '%s' in arg %d of %s%s%s%s '%s' %s proxy '%s' : %s.\n",
+				      cur->file, cur->line,
+				      arg->data.str.str,
+				      cur->arg_pos + 1, conv_pre, conv_ctx, conv_pos, ctx, cur->kw, where, p->id, err);
+				cfgerr++;
+				continue;
+			}
+
+			free(arg->data.str.str);
+			arg->data.str.str = NULL;
+			arg->unresolved = 0;
+			arg->data.reg = reg;
+			break;
+
+
 		}
 
 		LIST_DEL(&cur->list);