[PATCH v2 3/3] inet: Return EAI_MEMORY when nrl_domainname() fails to allocate memory
Adhemerval Zanella
adhemerval.zanella@linaro.org
Thu Feb 3 20:53:01 GMT 2022
Ping.
On 10/12/2021 08:07, Adhemerval Zanella wrote:
> It aligns NI_NOFQDN with default behavior for getnameinfo().
>
> Checked on x86_64-linux-gnu.
> ---
> inet/getnameinfo.c | 140 +++++++++++++++++++++++----------------------
> 1 file changed, 72 insertions(+), 68 deletions(-)
>
> diff --git a/inet/getnameinfo.c b/inet/getnameinfo.c
> index 2d2397e7dc..acf1538a37 100644
> --- a/inet/getnameinfo.c
> +++ b/inet/getnameinfo.c
> @@ -83,94 +83,95 @@ libc_freeres_ptr (static char *domain);
> now ignored. */
> #define DEPRECATED_NI_IDN 192
>
> -static void
> +static bool
> nrl_domainname_core (struct scratch_buffer *tmpbuf)
> {
> char *c;
> struct hostent *h, th;
> int herror;
>
> - while (__gethostbyname_r ("localhost", &th,
> - tmpbuf->data, tmpbuf->length,
> + while (__gethostbyname_r ("localhost", &th, tmpbuf->data, tmpbuf->length,
> &h, &herror))
> {
> if (herror == NETDB_INTERNAL && errno == ERANGE)
> {
> if (!scratch_buffer_grow (tmpbuf))
> - return;
> + return false;
> }
> else
> break;
> }
>
> if (h != NULL && (c = strchr (h->h_name, '.')) != NULL)
> - domain = __strdup (++c);
> - else
> {
> - /* The name contains no domain information. Use the name
> - now to get more information. */
> - while (__gethostname (tmpbuf->data, tmpbuf->length))
> - if (!scratch_buffer_grow (tmpbuf))
> - return;
> -
> - if ((c = strchr (tmpbuf->data, '.')) != NULL)
> - domain = __strdup (++c);
> - else
> - {
> - /* We need to preserve the hostname. */
> - size_t hstnamelen = strlen (tmpbuf->data) + 1;
> - while (__gethostbyname_r (tmpbuf->data, &th,
> - tmpbuf->data + hstnamelen,
> - tmpbuf->length - hstnamelen,
> - &h, &herror))
> - {
> - if (herror == NETDB_INTERNAL && errno == ERANGE)
> - {
> - if (!scratch_buffer_grow_preserve (tmpbuf))
> - return;
> - }
> - else
> - break;
> - }
> + domain = __strdup (++c);
> + return domain != NULL;
> + }
>
> - if (h != NULL && (c = strchr(h->h_name, '.')) != NULL)
> - domain = __strdup (++c);
> - else
> - {
> - struct in_addr in_addr;
> + /* The name contains no domain information. Use the name
> + now to get more information. */
> + while (__gethostname (tmpbuf->data, tmpbuf->length))
> + if (!scratch_buffer_grow (tmpbuf))
> + return false;
>
> - in_addr.s_addr = htonl (INADDR_LOOPBACK);
> + if ((c = strchr (tmpbuf->data, '.')) != NULL)
> + {
> + domain = __strdup (++c);
> + return domain != NULL;
> + }
>
> - while (__gethostbyaddr_r ((const char *) &in_addr,
> - sizeof (struct in_addr),
> - AF_INET, &th,
> - tmpbuf->data,
> - tmpbuf->length,
> - &h, &herror))
> - {
> - if (herror == NETDB_INTERNAL && errno == ERANGE)
> - {
> - if (!scratch_buffer_grow (tmpbuf))
> - return;
> - }
> - else
> - break;
> - }
> + /* We need to preserve the hostname. */
> + size_t hstnamelen = strlen (tmpbuf->data) + 1;
> + while (__gethostbyname_r (tmpbuf->data, &th, tmpbuf->data + hstnamelen,
> + tmpbuf->length - hstnamelen, &h, &herror))
> + {
> + if (herror == NETDB_INTERNAL && errno == ERANGE)
> + {
> + if (!scratch_buffer_grow_preserve (tmpbuf))
> + return false;
> + }
> + else
> + break;
> + }
>
> - if (h != NULL && (c = strchr (h->h_name, '.')) != NULL)
> - domain = __strdup (++c);
> - }
> + if (h != NULL && (c = strchr(h->h_name, '.')) != NULL)
> + {
> + domain = __strdup (++c);
> + return domain != NULL;
> + }
> +
> + struct in_addr in_addr = { .s_addr = htonl (INADDR_LOOPBACK) };
> +
> + while (__gethostbyaddr_r ((const char *) &in_addr, sizeof (struct in_addr),
> + AF_INET, &th, tmpbuf->data, tmpbuf->length, &h,
> + &herror))
> + {
> + if (herror == NETDB_INTERNAL && errno == ERANGE)
> + {
> + if (!scratch_buffer_grow (tmpbuf))
> + return false;
> }
> + else
> + break;
> + }
> +
> + if (h != NULL && (c = strchr (h->h_name, '.')) != NULL)
> + {
> + domain = __strdup (++c);
> + return domain != NULL;
> }
> + return true;
> }
>
> -static char *
> +static bool
> nrl_domainname (void)
> {
> static int not_first;
>
> if (__glibc_likely (atomic_load_acquire (¬_first) != 0))
> - return domain;
> + return true;
> +
> + int r = true;
>
> __libc_lock_define_initialized (static, lock);
> __libc_lock_lock (lock);
> @@ -180,16 +181,15 @@ nrl_domainname (void)
> struct scratch_buffer tmpbuf;
> scratch_buffer_init (&tmpbuf);
>
> - nrl_domainname_core (&tmpbuf);
> + if ((r = nrl_domainname_core (&tmpbuf)))
> + atomic_store_release (¬_first, 1);
>
> scratch_buffer_free (&tmpbuf);
> -
> - atomic_store_release (¬_first, 1);
> }
>
> __libc_lock_unlock (lock);
>
> - return domain;
> + return r;
> };
>
> /* Copy a string to a destination buffer with length checking. Return
> @@ -285,13 +285,17 @@ gni_host_inet_name (struct scratch_buffer *tmpbuf,
>
> if (h)
> {
> - char *c;
> - if ((flags & NI_NOFQDN)
> - && (c = nrl_domainname ())
> - && (c = strstr (h->h_name, c))
> - && (c != h->h_name) && (*(--c) == '.'))
> - /* Terminate the string after the prefix. */
> - *c = '\0';
> + if (flags & NI_NOFQDN)
> + {
> + if (!nrl_domainname ())
> + return EAI_MEMORY;
> +
> + char *c = domain;
> + if (c != NULL && (c = strstr (h->h_name, c))
> + && (c != h->h_name) && (*(--c) == '.'))
> + /* Terminate the string after the prefix. */
> + *c = '\0';
> + }
>
> /* If requested, convert from the IDN format. */
> bool do_idn = flags & NI_IDN;
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