From 06890c7ba553e82393413c59bb3131db5815a337 Mon Sep 17 00:00:00 2001 From: Siddhesh Poyarekar Date: Tue, 27 Jul 2021 22:49:53 +0530 Subject: gaiconf_init: Refactor some bits for readability Split out line processing for `label`, `precedence` and `scopev4` into separate functions instead of the gotos. Signed-off-by: Siddhesh Poyarekar Reviewed-by: DJ Delorie --- sysdeps/posix/getaddrinfo.c | 149 +++++++++++++++++++++++++------------------- 1 file changed, 84 insertions(+), 65 deletions(-) diff --git a/sysdeps/posix/getaddrinfo.c b/sysdeps/posix/getaddrinfo.c index 0ece3b46b7..984baf9744 100644 --- a/sysdeps/posix/getaddrinfo.c +++ b/sysdeps/posix/getaddrinfo.c @@ -1851,6 +1851,66 @@ scopecmp (const void *p1, const void *p2) return 1; } +static bool +add_prefixlist (struct prefixlist **listp, size_t *lenp, bool *nullbitsp, + char *val1, char *val2, char **pos) +{ + struct in6_addr prefix; + unsigned long int bits; + unsigned long int val; + char *endp; + + bits = 128; + __set_errno (0); + char *cp = strchr (val1, '/'); + if (cp != NULL) + *cp++ = '\0'; + *pos = cp; + if (inet_pton (AF_INET6, val1, &prefix) + && (cp == NULL + || (bits = strtoul (cp, &endp, 10)) != ULONG_MAX + || errno != ERANGE) + && *endp == '\0' + && bits <= 128 + && ((val = strtoul (val2, &endp, 10)) != ULONG_MAX + || errno != ERANGE) + && *endp == '\0' + && val <= INT_MAX) + { + struct prefixlist *newp = malloc (sizeof (*newp)); + if (newp == NULL) + return false; + + memcpy (&newp->entry.prefix, &prefix, sizeof (prefix)); + newp->entry.bits = bits; + newp->entry.val = val; + newp->next = *listp; + *listp = newp; + ++*lenp; + *nullbitsp |= bits == 0; + } + return true; +} + +static bool +add_scopelist (struct scopelist **listp, size_t *lenp, bool *nullbitsp, + const struct in6_addr *prefixp, unsigned long int bits, + unsigned long int val) +{ + struct scopelist *newp = malloc (sizeof (*newp)); + if (newp == NULL) + return false; + + newp->entry.netmask = htonl (bits != 96 ? (0xffffffff << (128 - bits)) : 0); + newp->entry.addr32 = (prefixp->s6_addr32[3] & newp->entry.netmask); + newp->entry.scope = val; + newp->next = *listp; + *listp = newp; + ++*lenp; + *nullbitsp |= bits == 96; + + return true; +} static void gaiconf_init (void) @@ -1926,55 +1986,17 @@ gaiconf_init (void) /* Ignore the rest of the line. */ *cp = '\0'; - struct prefixlist **listp; - size_t *lenp; - bool *nullbitsp; switch (cmdlen) { case 5: if (strcmp (cmd, "label") == 0) { - struct in6_addr prefix; - unsigned long int bits; - unsigned long int val; - char *endp; - - listp = &labellist; - lenp = &nlabellist; - nullbitsp = &labellist_nullbits; - - new_elem: - bits = 128; - __set_errno (0); - cp = strchr (val1, '/'); - if (cp != NULL) - *cp++ = '\0'; - if (inet_pton (AF_INET6, val1, &prefix) - && (cp == NULL - || (bits = strtoul (cp, &endp, 10)) != ULONG_MAX - || errno != ERANGE) - && *endp == '\0' - && bits <= 128 - && ((val = strtoul (val2, &endp, 10)) != ULONG_MAX - || errno != ERANGE) - && *endp == '\0' - && val <= INT_MAX) + if (!add_prefixlist (&labellist, &nlabellist, + &labellist_nullbits, val1, val2, &cp)) { - struct prefixlist *newp = malloc (sizeof (*newp)); - if (newp == NULL) - { - free (line); - fclose (fp); - goto no_file; - } - - memcpy (&newp->entry.prefix, &prefix, sizeof (prefix)); - newp->entry.bits = bits; - newp->entry.val = val; - newp->next = *listp; - *listp = newp; - ++*lenp; - *nullbitsp |= bits == 0; + free (line); + fclose (fp); + goto no_file; } } break; @@ -2016,27 +2038,14 @@ gaiconf_init (void) && *endp == '\0' && val <= INT_MAX) { - struct scopelist *newp; - new_scope: - newp = malloc (sizeof (*newp)); - if (newp == NULL) + if (!add_scopelist (&scopelist, &nscopelist, + &scopelist_nullbits, &prefix, + bits, val)) { free (line); fclose (fp); goto no_file; } - - newp->entry.netmask = htonl (bits != 96 - ? (0xffffffff - << (128 - bits)) - : 0); - newp->entry.addr32 = (prefix.s6_addr32[3] - & newp->entry.netmask); - newp->entry.scope = val; - newp->next = scopelist; - scopelist = newp; - ++nscopelist; - scopelist_nullbits |= bits == 96; } } else if (inet_pton (AF_INET, val1, &prefix.s6_addr32[3]) @@ -2050,8 +2059,14 @@ gaiconf_init (void) && *endp == '\0' && val <= INT_MAX) { - bits += 96; - goto new_scope; + if (!add_scopelist (&scopelist, &nscopelist, + &scopelist_nullbits, &prefix, + bits + 96, val)) + { + free (line); + fclose (fp); + goto no_file; + } } } break; @@ -2059,10 +2074,14 @@ gaiconf_init (void) case 10: if (strcmp (cmd, "precedence") == 0) { - listp = &precedencelist; - lenp = &nprecedencelist; - nullbitsp = &precedencelist_nullbits; - goto new_elem; + if (!add_prefixlist (&precedencelist, &nprecedencelist, + &precedencelist_nullbits, val1, val2, + &cp)) + { + free (line); + fclose (fp); + goto no_file; + } } break; } -- cgit 1.4.1