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-rw-r--r--lib/lwres/lwconfig.c725
1 files changed, 725 insertions, 0 deletions
diff --git a/lib/lwres/lwconfig.c b/lib/lwres/lwconfig.c
new file mode 100644
index 0000000..15f4abb
--- /dev/null
+++ b/lib/lwres/lwconfig.c
@@ -0,0 +1,725 @@
+/*
+ * Copyright (C) 2004-2007 Internet Systems Consortium, Inc. ("ISC")
+ * Copyright (C) 2000-2003 Internet Software Consortium.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
+ * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
+ * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+ * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
+ * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+ * PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/* $Id: lwconfig.c,v 1.46 2007/06/19 23:47:22 tbox Exp $ */
+
+/*! \file */
+
+/**
+ * Module for parsing resolv.conf files.
+ *
+ * lwres_conf_init() creates an empty lwres_conf_t structure for
+ * lightweight resolver context ctx.
+ *
+ * lwres_conf_clear() frees up all the internal memory used by that
+ * lwres_conf_t structure in resolver context ctx.
+ *
+ * lwres_conf_parse() opens the file filename and parses it to initialise
+ * the resolver context ctx's lwres_conf_t structure.
+ *
+ * lwres_conf_print() prints the lwres_conf_t structure for resolver
+ * context ctx to the FILE fp.
+ *
+ * \section lwconfig_return Return Values
+ *
+ * lwres_conf_parse() returns #LWRES_R_SUCCESS if it successfully read and
+ * parsed filename. It returns #LWRES_R_FAILURE if filename could not be
+ * opened or contained incorrect resolver statements.
+ *
+ * lwres_conf_print() returns #LWRES_R_SUCCESS unless an error occurred
+ * when converting the network addresses to a numeric host address
+ * string. If this happens, the function returns #LWRES_R_FAILURE.
+ *
+ * \section lwconfig_see See Also
+ *
+ * stdio(3), \link resolver resolver \endlink
+ *
+ * \section files Files
+ *
+ * /etc/resolv.conf
+ */
+
+#include <config.h>
+
+#include <assert.h>
+#include <ctype.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <lwres/lwbuffer.h>
+#include <lwres/lwres.h>
+#include <lwres/net.h>
+#include <lwres/result.h>
+
+#include "assert_p.h"
+#include "context_p.h"
+
+
+#if ! defined(NS_INADDRSZ)
+#define NS_INADDRSZ 4
+#endif
+
+#if ! defined(NS_IN6ADDRSZ)
+#define NS_IN6ADDRSZ 16
+#endif
+
+static lwres_result_t
+lwres_conf_parsenameserver(lwres_context_t *ctx, FILE *fp);
+
+static lwres_result_t
+lwres_conf_parselwserver(lwres_context_t *ctx, FILE *fp);
+
+static lwres_result_t
+lwres_conf_parsedomain(lwres_context_t *ctx, FILE *fp);
+
+static lwres_result_t
+lwres_conf_parsesearch(lwres_context_t *ctx, FILE *fp);
+
+static lwres_result_t
+lwres_conf_parsesortlist(lwres_context_t *ctx, FILE *fp);
+
+static lwres_result_t
+lwres_conf_parseoption(lwres_context_t *ctx, FILE *fp);
+
+static void
+lwres_resetaddr(lwres_addr_t *addr);
+
+static lwres_result_t
+lwres_create_addr(const char *buff, lwres_addr_t *addr, int convert_zero);
+
+static int lwresaddr2af(int lwresaddrtype);
+
+
+static int
+lwresaddr2af(int lwresaddrtype)
+{
+ int af = 0;
+
+ switch (lwresaddrtype) {
+ case LWRES_ADDRTYPE_V4:
+ af = AF_INET;
+ break;
+
+ case LWRES_ADDRTYPE_V6:
+ af = AF_INET6;
+ break;
+ }
+
+ return (af);
+}
+
+
+/*!
+ * Eat characters from FP until EOL or EOF. Returns EOF or '\n'
+ */
+static int
+eatline(FILE *fp) {
+ int ch;
+
+ ch = fgetc(fp);
+ while (ch != '\n' && ch != EOF)
+ ch = fgetc(fp);
+
+ return (ch);
+}
+
+
+/*!
+ * Eats white space up to next newline or non-whitespace character (of
+ * EOF). Returns the last character read. Comments are considered white
+ * space.
+ */
+static int
+eatwhite(FILE *fp) {
+ int ch;
+
+ ch = fgetc(fp);
+ while (ch != '\n' && ch != EOF && isspace((unsigned char)ch))
+ ch = fgetc(fp);
+
+ if (ch == ';' || ch == '#')
+ ch = eatline(fp);
+
+ return (ch);
+}
+
+
+/*!
+ * Skip over any leading whitespace and then read in the next sequence of
+ * non-whitespace characters. In this context newline is not considered
+ * whitespace. Returns EOF on end-of-file, or the character
+ * that caused the reading to stop.
+ */
+static int
+getword(FILE *fp, char *buffer, size_t size) {
+ int ch;
+ char *p = buffer;
+
+ REQUIRE(buffer != NULL);
+ REQUIRE(size > 0U);
+
+ *p = '\0';
+
+ ch = eatwhite(fp);
+
+ if (ch == EOF)
+ return (EOF);
+
+ do {
+ *p = '\0';
+
+ if (ch == EOF || isspace((unsigned char)ch))
+ break;
+ else if ((size_t) (p - buffer) == size - 1)
+ return (EOF); /* Not enough space. */
+
+ *p++ = (char)ch;
+ ch = fgetc(fp);
+ } while (1);
+
+ return (ch);
+}
+
+static void
+lwres_resetaddr(lwres_addr_t *addr) {
+ REQUIRE(addr != NULL);
+
+ memset(addr->address, 0, LWRES_ADDR_MAXLEN);
+ addr->family = 0;
+ addr->length = 0;
+}
+
+static char *
+lwres_strdup(lwres_context_t *ctx, const char *str) {
+ char *p;
+
+ REQUIRE(str != NULL);
+ REQUIRE(strlen(str) > 0U);
+
+ p = CTXMALLOC(strlen(str) + 1);
+ if (p != NULL)
+ strcpy(p, str);
+
+ return (p);
+}
+
+/*% intializes data structure for subsequent config parsing. */
+void
+lwres_conf_init(lwres_context_t *ctx) {
+ int i;
+ lwres_conf_t *confdata;
+
+ REQUIRE(ctx != NULL);
+ confdata = &ctx->confdata;
+
+ confdata->nsnext = 0;
+ confdata->lwnext = 0;
+ confdata->domainname = NULL;
+ confdata->searchnxt = 0;
+ confdata->sortlistnxt = 0;
+ confdata->resdebug = 0;
+ confdata->ndots = 1;
+ confdata->no_tld_query = 0;
+
+ for (i = 0; i < LWRES_CONFMAXNAMESERVERS; i++)
+ lwres_resetaddr(&confdata->nameservers[i]);
+
+ for (i = 0; i < LWRES_CONFMAXSEARCH; i++)
+ confdata->search[i] = NULL;
+
+ for (i = 0; i < LWRES_CONFMAXSORTLIST; i++) {
+ lwres_resetaddr(&confdata->sortlist[i].addr);
+ lwres_resetaddr(&confdata->sortlist[i].mask);
+ }
+}
+
+/*% Frees up all the internal memory used by the config data structure, returning it to the lwres_context_t. */
+void
+lwres_conf_clear(lwres_context_t *ctx) {
+ int i;
+ lwres_conf_t *confdata;
+
+ REQUIRE(ctx != NULL);
+ confdata = &ctx->confdata;
+
+ for (i = 0; i < confdata->nsnext; i++)
+ lwres_resetaddr(&confdata->nameservers[i]);
+
+ if (confdata->domainname != NULL) {
+ CTXFREE(confdata->domainname,
+ strlen(confdata->domainname) + 1);
+ confdata->domainname = NULL;
+ }
+
+ for (i = 0; i < confdata->searchnxt; i++) {
+ if (confdata->search[i] != NULL) {
+ CTXFREE(confdata->search[i],
+ strlen(confdata->search[i]) + 1);
+ confdata->search[i] = NULL;
+ }
+ }
+
+ for (i = 0; i < LWRES_CONFMAXSORTLIST; i++) {
+ lwres_resetaddr(&confdata->sortlist[i].addr);
+ lwres_resetaddr(&confdata->sortlist[i].mask);
+ }
+
+ confdata->nsnext = 0;
+ confdata->lwnext = 0;
+ confdata->domainname = NULL;
+ confdata->searchnxt = 0;
+ confdata->sortlistnxt = 0;
+ confdata->resdebug = 0;
+ confdata->ndots = 1;
+ confdata->no_tld_query = 0;
+}
+
+static lwres_result_t
+lwres_conf_parsenameserver(lwres_context_t *ctx, FILE *fp) {
+ char word[LWRES_CONFMAXLINELEN];
+ int res;
+ lwres_conf_t *confdata;
+ lwres_addr_t address;
+
+ confdata = &ctx->confdata;
+
+ if (confdata->nsnext == LWRES_CONFMAXNAMESERVERS)
+ return (LWRES_R_SUCCESS);
+
+ res = getword(fp, word, sizeof(word));
+ if (strlen(word) == 0U)
+ return (LWRES_R_FAILURE); /* Nothing on line. */
+ else if (res == ' ' || res == '\t')
+ res = eatwhite(fp);
+
+ if (res != EOF && res != '\n')
+ return (LWRES_R_FAILURE); /* Extra junk on line. */
+
+ res = lwres_create_addr(word, &address, 1);
+ if (res == LWRES_R_SUCCESS)
+ confdata->nameservers[confdata->nsnext++] = address;
+
+ return (LWRES_R_SUCCESS);
+}
+
+static lwres_result_t
+lwres_conf_parselwserver(lwres_context_t *ctx, FILE *fp) {
+ char word[LWRES_CONFMAXLINELEN];
+ int res;
+ lwres_conf_t *confdata;
+
+ confdata = &ctx->confdata;
+
+ if (confdata->lwnext == LWRES_CONFMAXLWSERVERS)
+ return (LWRES_R_SUCCESS);
+
+ res = getword(fp, word, sizeof(word));
+ if (strlen(word) == 0U)
+ return (LWRES_R_FAILURE); /* Nothing on line. */
+ else if (res == ' ' || res == '\t')
+ res = eatwhite(fp);
+
+ if (res != EOF && res != '\n')
+ return (LWRES_R_FAILURE); /* Extra junk on line. */
+
+ res = lwres_create_addr(word,
+ &confdata->lwservers[confdata->lwnext++], 1);
+ if (res != LWRES_R_SUCCESS)
+ return (res);
+
+ return (LWRES_R_SUCCESS);
+}
+
+static lwres_result_t
+lwres_conf_parsedomain(lwres_context_t *ctx, FILE *fp) {
+ char word[LWRES_CONFMAXLINELEN];
+ int res, i;
+ lwres_conf_t *confdata;
+
+ confdata = &ctx->confdata;
+
+ res = getword(fp, word, sizeof(word));
+ if (strlen(word) == 0U)
+ return (LWRES_R_FAILURE); /* Nothing else on line. */
+ else if (res == ' ' || res == '\t')
+ res = eatwhite(fp);
+
+ if (res != EOF && res != '\n')
+ return (LWRES_R_FAILURE); /* Extra junk on line. */
+
+ if (confdata->domainname != NULL)
+ CTXFREE(confdata->domainname,
+ strlen(confdata->domainname) + 1); /* */
+
+ /*
+ * Search and domain are mutually exclusive.
+ */
+ for (i = 0; i < LWRES_CONFMAXSEARCH; i++) {
+ if (confdata->search[i] != NULL) {
+ CTXFREE(confdata->search[i],
+ strlen(confdata->search[i])+1);
+ confdata->search[i] = NULL;
+ }
+ }
+ confdata->searchnxt = 0;
+
+ confdata->domainname = lwres_strdup(ctx, word);
+
+ if (confdata->domainname == NULL)
+ return (LWRES_R_FAILURE);
+
+ return (LWRES_R_SUCCESS);
+}
+
+static lwres_result_t
+lwres_conf_parsesearch(lwres_context_t *ctx, FILE *fp) {
+ int idx, delim;
+ char word[LWRES_CONFMAXLINELEN];
+ lwres_conf_t *confdata;
+
+ confdata = &ctx->confdata;
+
+ if (confdata->domainname != NULL) {
+ /*
+ * Search and domain are mutually exclusive.
+ */
+ CTXFREE(confdata->domainname,
+ strlen(confdata->domainname) + 1);
+ confdata->domainname = NULL;
+ }
+
+ /*
+ * Remove any previous search definitions.
+ */
+ for (idx = 0; idx < LWRES_CONFMAXSEARCH; idx++) {
+ if (confdata->search[idx] != NULL) {
+ CTXFREE(confdata->search[idx],
+ strlen(confdata->search[idx])+1);
+ confdata->search[idx] = NULL;
+ }
+ }
+ confdata->searchnxt = 0;
+
+ delim = getword(fp, word, sizeof(word));
+ if (strlen(word) == 0U)
+ return (LWRES_R_FAILURE); /* Nothing else on line. */
+
+ idx = 0;
+ while (strlen(word) > 0U) {
+ if (confdata->searchnxt == LWRES_CONFMAXSEARCH)
+ goto ignore; /* Too many domains. */
+
+ confdata->search[idx] = lwres_strdup(ctx, word);
+ if (confdata->search[idx] == NULL)
+ return (LWRES_R_FAILURE);
+ idx++;
+ confdata->searchnxt++;
+
+ ignore:
+ if (delim == EOF || delim == '\n')
+ break;
+ else
+ delim = getword(fp, word, sizeof(word));
+ }
+
+ return (LWRES_R_SUCCESS);
+}
+
+static lwres_result_t
+lwres_create_addr(const char *buffer, lwres_addr_t *addr, int convert_zero) {
+ struct in_addr v4;
+ struct in6_addr v6;
+
+ if (lwres_net_aton(buffer, &v4) == 1) {
+ if (convert_zero) {
+ unsigned char zeroaddress[] = {0, 0, 0, 0};
+ unsigned char loopaddress[] = {127, 0, 0, 1};
+ if (memcmp(&v4, zeroaddress, 4) == 0)
+ memcpy(&v4, loopaddress, 4);
+ }
+ addr->family = LWRES_ADDRTYPE_V4;
+ addr->length = NS_INADDRSZ;
+ memcpy((void *)addr->address, &v4, NS_INADDRSZ);
+
+ } else if (lwres_net_pton(AF_INET6, buffer, &v6) == 1) {
+ addr->family = LWRES_ADDRTYPE_V6;
+ addr->length = NS_IN6ADDRSZ;
+ memcpy((void *)addr->address, &v6, NS_IN6ADDRSZ);
+ } else {
+ return (LWRES_R_FAILURE); /* Unrecognised format. */
+ }
+
+ return (LWRES_R_SUCCESS);
+}
+
+static lwres_result_t
+lwres_conf_parsesortlist(lwres_context_t *ctx, FILE *fp) {
+ int delim, res, idx;
+ char word[LWRES_CONFMAXLINELEN];
+ char *p;
+ lwres_conf_t *confdata;
+
+ confdata = &ctx->confdata;
+
+ delim = getword(fp, word, sizeof(word));
+ if (strlen(word) == 0U)
+ return (LWRES_R_FAILURE); /* Empty line after keyword. */
+
+ while (strlen(word) > 0U) {
+ if (confdata->sortlistnxt == LWRES_CONFMAXSORTLIST)
+ return (LWRES_R_FAILURE); /* Too many values. */
+
+ p = strchr(word, '/');
+ if (p != NULL)
+ *p++ = '\0';
+
+ idx = confdata->sortlistnxt;
+ res = lwres_create_addr(word, &confdata->sortlist[idx].addr, 1);
+ if (res != LWRES_R_SUCCESS)
+ return (res);
+
+ if (p != NULL) {
+ res = lwres_create_addr(p,
+ &confdata->sortlist[idx].mask,
+ 0);
+ if (res != LWRES_R_SUCCESS)
+ return (res);
+ } else {
+ /*
+ * Make up a mask.
+ */
+ confdata->sortlist[idx].mask =
+ confdata->sortlist[idx].addr;
+
+ memset(&confdata->sortlist[idx].mask.address, 0xff,
+ confdata->sortlist[idx].addr.length);
+ }
+
+ confdata->sortlistnxt++;
+
+ if (delim == EOF || delim == '\n')
+ break;
+ else
+ delim = getword(fp, word, sizeof(word));
+ }
+
+ return (LWRES_R_SUCCESS);
+}
+
+static lwres_result_t
+lwres_conf_parseoption(lwres_context_t *ctx, FILE *fp) {
+ int delim;
+ long ndots;
+ char *p;
+ char word[LWRES_CONFMAXLINELEN];
+ lwres_conf_t *confdata;
+
+ REQUIRE(ctx != NULL);
+ confdata = &ctx->confdata;
+
+ delim = getword(fp, word, sizeof(word));
+ if (strlen(word) == 0U)
+ return (LWRES_R_FAILURE); /* Empty line after keyword. */
+
+ while (strlen(word) > 0U) {
+ if (strcmp("debug", word) == 0) {
+ confdata->resdebug = 1;
+ } else if (strcmp("no_tld_query", word) == 0) {
+ confdata->no_tld_query = 1;
+ } else if (strncmp("ndots:", word, 6) == 0) {
+ ndots = strtol(word + 6, &p, 10);
+ if (*p != '\0') /* Bad string. */
+ return (LWRES_R_FAILURE);
+ if (ndots < 0 || ndots > 0xff) /* Out of range. */
+ return (LWRES_R_FAILURE);
+ confdata->ndots = (lwres_uint8_t)ndots;
+ }
+
+ if (delim == EOF || delim == '\n')
+ break;
+ else
+ delim = getword(fp, word, sizeof(word));
+ }
+
+ return (LWRES_R_SUCCESS);
+}
+
+/*% parses a file and fills in the data structure. */
+lwres_result_t
+lwres_conf_parse(lwres_context_t *ctx, const char *filename) {
+ FILE *fp = NULL;
+ char word[256];
+ lwres_result_t rval, ret;
+ lwres_conf_t *confdata;
+ int stopchar;
+
+ REQUIRE(ctx != NULL);
+ confdata = &ctx->confdata;
+
+ REQUIRE(filename != NULL);
+ REQUIRE(strlen(filename) > 0U);
+ REQUIRE(confdata != NULL);
+
+ errno = 0;
+ if ((fp = fopen(filename, "r")) == NULL)
+ return (LWRES_R_NOTFOUND);
+
+ ret = LWRES_R_SUCCESS;
+ do {
+ stopchar = getword(fp, word, sizeof(word));
+ if (stopchar == EOF) {
+ rval = LWRES_R_SUCCESS;
+ break;
+ }
+
+ if (strlen(word) == 0U)
+ rval = LWRES_R_SUCCESS;
+ else if (strcmp(word, "nameserver") == 0)
+ rval = lwres_conf_parsenameserver(ctx, fp);
+ else if (strcmp(word, "lwserver") == 0)
+ rval = lwres_conf_parselwserver(ctx, fp);
+ else if (strcmp(word, "domain") == 0)
+ rval = lwres_conf_parsedomain(ctx, fp);
+ else if (strcmp(word, "search") == 0)
+ rval = lwres_conf_parsesearch(ctx, fp);
+ else if (strcmp(word, "sortlist") == 0)
+ rval = lwres_conf_parsesortlist(ctx, fp);
+ else if (strcmp(word, "options") == 0)
+ rval = lwres_conf_parseoption(ctx, fp);
+ else {
+ /* unrecognised word. Ignore entire line */
+ rval = LWRES_R_SUCCESS;
+ stopchar = eatline(fp);
+ if (stopchar == EOF) {
+ break;
+ }
+ }
+ if (ret == LWRES_R_SUCCESS && rval != LWRES_R_SUCCESS)
+ ret = rval;
+ } while (1);
+
+ fclose(fp);
+
+ return (ret);
+}
+
+/*% Prints the config data structure to the FILE. */
+lwres_result_t
+lwres_conf_print(lwres_context_t *ctx, FILE *fp) {
+ int i;
+ int af;
+ char tmp[sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")];
+ const char *p;
+ lwres_conf_t *confdata;
+ lwres_addr_t tmpaddr;
+
+ REQUIRE(ctx != NULL);
+ confdata = &ctx->confdata;
+
+ REQUIRE(confdata->nsnext <= LWRES_CONFMAXNAMESERVERS);
+
+ for (i = 0; i < confdata->nsnext; i++) {
+ af = lwresaddr2af(confdata->nameservers[i].family);
+
+ p = lwres_net_ntop(af, confdata->nameservers[i].address,
+ tmp, sizeof(tmp));
+ if (p != tmp)
+ return (LWRES_R_FAILURE);
+
+ fprintf(fp, "nameserver %s\n", tmp);
+ }
+
+ for (i = 0; i < confdata->lwnext; i++) {
+ af = lwresaddr2af(confdata->lwservers[i].family);
+
+ p = lwres_net_ntop(af, confdata->lwservers[i].address,
+ tmp, sizeof(tmp));
+ if (p != tmp)
+ return (LWRES_R_FAILURE);
+
+ fprintf(fp, "lwserver %s\n", tmp);
+ }
+
+ if (confdata->domainname != NULL) {
+ fprintf(fp, "domain %s\n", confdata->domainname);
+ } else if (confdata->searchnxt > 0) {
+ REQUIRE(confdata->searchnxt <= LWRES_CONFMAXSEARCH);
+
+ fprintf(fp, "search");
+ for (i = 0; i < confdata->searchnxt; i++)
+ fprintf(fp, " %s", confdata->search[i]);
+ fputc('\n', fp);
+ }
+
+ REQUIRE(confdata->sortlistnxt <= LWRES_CONFMAXSORTLIST);
+
+ if (confdata->sortlistnxt > 0) {
+ fputs("sortlist", fp);
+ for (i = 0; i < confdata->sortlistnxt; i++) {
+ af = lwresaddr2af(confdata->sortlist[i].addr.family);
+
+ p = lwres_net_ntop(af,
+ confdata->sortlist[i].addr.address,
+ tmp, sizeof(tmp));
+ if (p != tmp)
+ return (LWRES_R_FAILURE);
+
+ fprintf(fp, " %s", tmp);
+
+ tmpaddr = confdata->sortlist[i].mask;
+ memset(&tmpaddr.address, 0xff, tmpaddr.length);
+
+ if (memcmp(&tmpaddr.address,
+ confdata->sortlist[i].mask.address,
+ confdata->sortlist[i].mask.length) != 0) {
+ af = lwresaddr2af(
+ confdata->sortlist[i].mask.family);
+ p = lwres_net_ntop
+ (af,
+ confdata->sortlist[i].mask.address,
+ tmp, sizeof(tmp));
+ if (p != tmp)
+ return (LWRES_R_FAILURE);
+
+ fprintf(fp, "/%s", tmp);
+ }
+ }
+ fputc('\n', fp);
+ }
+
+ if (confdata->resdebug)
+ fprintf(fp, "options debug\n");
+
+ if (confdata->ndots > 0)
+ fprintf(fp, "options ndots:%d\n", confdata->ndots);
+
+ if (confdata->no_tld_query)
+ fprintf(fp, "options no_tld_query\n");
+
+ return (LWRES_R_SUCCESS);
+}
+
+/*% Returns a pointer to the current config structure. */
+lwres_conf_t *
+lwres_conf_get(lwres_context_t *ctx) {
+ REQUIRE(ctx != NULL);
+
+ return (&ctx->confdata);
+}
generated by cgit (git 2.34.1) at 2024-04-23 11:34:26 +0000