From 61f1399c2faedb8f81695da6d65c2bf1448fdef8 Mon Sep 17 00:00:00 2001 From: Dominick Meglio Date: Sat, 9 Apr 2005 16:49:47 +0000 Subject: [PATCH] Made sortlist support CIDR matching for IPv4 --- CHANGES | 4 +++ ares_gethostbyname.c | 12 ++++---- ares_init.c | 77 ++++++++++++++++++++++++++++++++++++++-------------- ares_private.h | 10 ++++++- bitncmp.c | 1 + 5 files changed, 77 insertions(+), 27 deletions(-) diff --git a/CHANGES b/CHANGES index a435502..6f8ce30 100644 --- a/CHANGES +++ b/CHANGES @@ -1,5 +1,9 @@ Changelog for the c-ares project +* April 9 + +- Made sortlist support CIDR matching for IPv4. + * April 8 - Added preliminary IPv6 support to ares_gethostbyname. Currently, sortlist diff --git a/ares_gethostbyname.c b/ares_gethostbyname.c index 92dc0c7..afd4c71 100644 --- a/ares_gethostbyname.c +++ b/ares_gethostbyname.c @@ -34,6 +34,7 @@ #include "ares.h" #include "ares_private.h" #include "inet_net_pton.h" +#include "bitncmp.h" #ifdef WATT32 #undef WIN32 @@ -189,10 +190,7 @@ static void end_hquery(struct host_query *hquery, int status, static int fake_hostent(const char *name, int family, ares_host_callback callback, void *arg) { - struct in_addr addr; - struct in6_addr addr6; struct hostent hostent; - const char *p; char *aliases[1] = { NULL }; char *addrs[2]; int result = 0; @@ -333,8 +331,12 @@ static int get_address_index(struct in_addr *addr, struct apattern *sortlist, for (i = 0; i < nsort; i++) { - if ((addr->s_addr & sortlist[i].mask.s_addr) == sortlist[i].addr.s_addr) - break; + if (sortlist[i].type = PATTERN_MASK) + if ((addr->s_addr & sortlist[i].mask.addr.s_addr) == sortlist[i].addr.s_addr) + break; + else + if (!ares_bitncmp(&addr->s_addr, &sortlist[i].addr.s_addr, sortlist[i].mask.bits)) + break; } return i; } diff --git a/ares_init.c b/ares_init.c index c9d1cd2..980e3d1 100644 --- a/ares_init.c +++ b/ares_init.c @@ -27,6 +27,10 @@ #include #endif +#ifdef HAVE_SYS_SOCKET_H +#include +#endif + #include #include #include @@ -47,6 +51,7 @@ #include #include "ares.h" #include "ares_private.h" +#include "inet_net_pton.h" #ifdef WATT32 #undef WIN32 /* Redefined in MingW/MSVC headers */ @@ -63,6 +68,7 @@ static int config_nameserver(struct server_state **servers, int *nservers, static int set_search(ares_channel channel, const char *str); static int set_options(ares_channel channel, const char *str); static const char *try_option(const char *p, const char *q, const char *opt); +static int sortlist_alloc(struct apattern **sortlist, int *nsort, struct apattern *pat); #ifndef WIN32 static int ip_addr(const char *s, int len, struct in_addr *addr); static void natural_mask(struct apattern *pat); @@ -830,30 +836,50 @@ static int config_sortlist(struct apattern **sortlist, int *nsort, /* Add sortlist entries. */ while (*str && *str != ';') { + int bits; + char ipbuf[16], ipbufpfx[32]; + /* Find just the IP */ q = str; while (*q && *q != '/' && *q != ';' && !isspace((unsigned char)*q)) q++; - if (ip_addr(str, (int)(q - str), &pat.addr) == 0) + memcpy(ipbuf, str, (int)(q-str)); + ipbuf[(int)(q-str)] = 0; + /* Find the prefix */ + if (*q == '/') + { + const char *str2 = q+1; + while (*q && *q != ';' && !isspace((unsigned char)*q)) + q++; + memcpy(ipbufpfx, str, (int)(q-str)); + ipbufpfx[(int)(q-str)] = 0; + str = str2; + } + else + ipbufpfx[0] = 0; + /* Lets see if it is CIDR */ + if (ipbufpfx && + (bits = ares_inet_net_pton(AF_INET, ipbufpfx, &pat.addr, sizeof(pat.addr))) > 0) + { + pat.type = PATTERN_CIDR; + pat.mask.bits = bits; + if (!sortlist_alloc(sortlist, nsort, &pat)) + return ARES_ENOMEM; + } + /* See if it is just a regular IP */ + else if (ip_addr(ipbuf, (int)(q-str), &pat.addr) == 0) { - /* We have a pattern address; now determine the mask. */ - if (*q == '/') + if (ipbufpfx) { - str = q + 1; - while (*q && *q != ';' && !isspace((unsigned char)*q)) - q++; - if (ip_addr(str, (int)(q - str), &pat.mask) != 0) + memcpy(ipbuf, str, (int)(q-str)); + ipbuf[(int)(q-str)] = 0; + if (ip_addr(ipbuf, (int)(q - str), &pat.mask.addr) != 0) natural_mask(&pat); } else natural_mask(&pat); - - /* Add this pattern to our list. */ - newsort = realloc(*sortlist, (*nsort + 1) * sizeof(struct apattern)); - if (!newsort) + pat.type = PATTERN_MASK; + if (!sortlist_alloc(sortlist, nsort, &pat)) return ARES_ENOMEM; - newsort[*nsort] = pat; - *sortlist = newsort; - (*nsort)++; } else { @@ -971,16 +997,25 @@ static const char *try_option(const char *p, const char *q, const char *opt) return ((size_t)(q - p) > len && !strncmp(p, opt, len)) ? &p[len] : NULL; } +static int sortlist_alloc(struct apattern **sortlist, int *nsort, struct apattern *pat) +{ + struct apattern *newsort; + newsort = realloc(*sortlist, (*nsort + 1) * sizeof(struct apattern)); + if (!newsort) + return 0; + newsort[*nsort] = *pat; + *sortlist = newsort; + (*nsort)++; + return 1; +} + #ifndef WIN32 -static int ip_addr(const char *s, int len, struct in_addr *addr) +static int ip_addr(const char *ipbuf, int len, struct in_addr *addr) { - char ipbuf[16]; /* Four octets and three periods yields at most 15 characters. */ if (len > 15) return -1; - memcpy(ipbuf, s, len); - ipbuf[len] = 0; addr->s_addr = inet_addr(ipbuf); if (addr->s_addr == INADDR_NONE && strcmp(ipbuf, "255.255.255.255") != 0) @@ -1001,10 +1036,10 @@ static void natural_mask(struct apattern *pat) * still rely on it. */ if (IN_CLASSA(addr.s_addr)) - pat->mask.s_addr = htonl(IN_CLASSA_NET); + pat->mask.addr.s_addr = htonl(IN_CLASSA_NET); else if (IN_CLASSB(addr.s_addr)) - pat->mask.s_addr = htonl(IN_CLASSB_NET); + pat->mask.addr.s_addr = htonl(IN_CLASSB_NET); else - pat->mask.s_addr = htonl(IN_CLASSC_NET); + pat->mask.addr.s_addr = htonl(IN_CLASSC_NET); } #endif diff --git a/ares_private.h b/ares_private.h index cf67e19..723afb3 100644 --- a/ares_private.h +++ b/ares_private.h @@ -124,9 +124,17 @@ struct query { }; /* An IP address pattern; matches an IP address X if X & mask == addr */ +#define PATTERN_MASK 0x1 +#define PATTERN_CIDR 0x2 + struct apattern { struct in_addr addr; - struct in_addr mask; + union + { + struct in_addr addr; + unsigned short bits; + } mask; + unsigned short type; }; struct ares_channeldata { diff --git a/bitncmp.c b/bitncmp.c index 32b70a9..3986dc6 100644 --- a/bitncmp.c +++ b/bitncmp.c @@ -19,6 +19,7 @@ #include #include +#include #include "bitncmp.h" /* -- 2.7.4