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       1                 :             : /* SPDX-FileCopyrightText: Copyright 2026 Cozens Software Solutions Limited
       2                 :             :  * SPDX-License-Identifier: PolyForm-Noncommercial-1.0.0 OR LicenseRef-PolyForm-Internal-Use-1.0.0 OR LicenseRef-COSOSO-Commercial
       3                 :             :  */
       4                 :             : 
       5                 :             : #include <stdbool.h>
       6                 :             : #include <stdint.h>
       7                 :             : 
       8                 :             : #include "SolidSyslogError.h"
       9                 :             : #include "SolidSyslogLwipRawAddressPrivate.h"
      10                 :             : #include "SolidSyslogLwipRawResolverErrors.h"
      11                 :             : #include "SolidSyslogLwipRawResolverPrivate.h"
      12                 :             : #include "SolidSyslogNullResolver.h"
      13                 :             : #include "SolidSyslogPrival.h"
      14                 :             : #include "SolidSyslogResolverCategories.h"
      15                 :             : #include "SolidSyslogResolverDefinition.h"
      16                 :             : #include "SolidSyslogTransport.h"
      17                 :             : #include "lwip/ip_addr.h"
      18                 :             : 
      19                 :             : const struct SolidSyslogErrorSource SolidSyslogLwipRawResolverErrorSource = {
      20                 :             :     "LwipRawResolver",
      21                 :             :     SolidSyslogResolverErrors_Name
      22                 :             : };
      23                 :             : 
      24                 :             : struct SolidSyslogAddress;
      25                 :             : 
      26                 :             : static bool LwipRawResolver_Resolve(
      27                 :             :     struct SolidSyslogResolver* base,
      28                 :             :     enum SolidSyslogTransport transport,
      29                 :             :     const char* host,
      30                 :             :     uint16_t port,
      31                 :             :     struct SolidSyslogAddress* result
      32                 :             : );
      33                 :             : 
      34                 :          18 : void SolidSyslogLwipRawResolver_Initialise(struct SolidSyslogResolver* base)
      35                 :             : {
      36                 :          18 :     base->Resolve = LwipRawResolver_Resolve;
      37                 :          18 : }
      38                 :             : 
      39                 :          18 : void SolidSyslogLwipRawResolver_Cleanup(struct SolidSyslogResolver* base)
      40                 :             : {
      41                 :             :     /* Overwrite the abstract base with the shared NullResolver vtable so
      42                 :             :      * use-after-destroy resolves cleanly to a failed-lookup error path
      43                 :             :      * rather than a NULL-fn-pointer crash. */
      44                 :          18 :     *base = *SolidSyslogNullResolver_Get();
      45                 :          18 : }
      46                 :             : 
      47                 :          12 : static bool LwipRawResolver_Resolve(
      48                 :             :     struct SolidSyslogResolver* base,
      49                 :             :     enum SolidSyslogTransport transport,
      50                 :             :     const char* host,
      51                 :             :     uint16_t port,
      52                 :             :     struct SolidSyslogAddress* result
      53                 :             : )
      54                 :             : {
      55                 :             :     (void) base;
      56                 :             :     (void) transport;
      57                 :          12 :     struct SolidSyslogLwipRawAddress* self = SolidSyslogLwipRawAddress_As(result);
      58                 :             :     /* No SolidSyslogLwipRaw_Marshal hop here: ipaddr_aton is a pure string
      59                 :             :      * parser that touches no lwIP core state, so it is safe on any thread.
      60                 :             :      * The sibling SolidSyslogLwipRawDnsResolver calls lwIP DNS APIs
      61                 :             :      * (dns_gethostbyname) and must marshal them - that is where the hop
      62                 :             :      * belongs, not here. */
      63                 :             :     ip_addr_t parsed;
      64                 :          12 :     bool resolved = false;
      65         [ +  + ]:          12 :     if (ipaddr_aton(host, &parsed) != 0)
      66                 :             :     {
      67                 :             :         /* IPv4 only, which is what the datagram's and stream's pcbs send to.
      68                 :             :          * A dual-stack lwIP parses an IPv6 literal too, and storing it would
      69                 :             :          * give the transports a destination they fail every send to. */
      70         [ +  + ]:           9 :         if (LwipRawAddress_IsIpv4(&parsed))
      71                 :             :         {
      72                 :           6 :             self->Ip = parsed;
      73                 :           6 :             self->Port = port;
      74                 :           6 :             resolved = true;
      75                 :             :         }
      76                 :             :         else
      77                 :             :         {
      78                 :           3 :             LwipRawResolver_Report(
      79                 :             :                 SOLIDSYSLOG_SEVERITY_ERROR,
      80                 :             :                 SOLIDSYSLOG_CAT_RESOLVER_RESOLVE_FAILED,
      81                 :             :                 SOLIDSYSLOG_RESOLVER_ERROR_ADDRESS_FAMILY_UNSUPPORTED
      82                 :             :             );
      83                 :             :         }
      84                 :             :     }
      85                 :          12 :     return resolved;
      86                 :             : }