grepcidr-2.0/0000700000175000017500000000000012267022663013002 5ustar jberkesjberkesgrepcidr-2.0/COPYING0000600000175000017500000003544610013343202014031 0ustar jberkesjberkes GNU GENERAL PUBLIC LICENSE Version 2, June 1991 Copyright (C) 1989, 1991 Free Software Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed. Preamble The licenses for most software are designed to take away your freedom to share and change it. By contrast, the GNU General Public License is intended to guarantee your freedom to share and change free software--to make sure the software is free for all its users. This General Public License applies to most of the Free Software Foundation's software and to any other program whose authors commit to using it. (Some other Free Software Foundation software is covered by the GNU Library General Public License instead.) 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Berkes www.berkes.ca This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include #include #include #include #include #include #include #include #include #include #include #include #define EXIT_OK 0 #define EXIT_NOMATCH 1 #define EXIT_ERROR 2 #define TXT_VERSION "grepcidr 2.0\nCopyright (C) 2004 - 2014 Jem E. Berkes \n" #define TXT_USAGE "Usage:\n" \ "\tgrepcidr [-V] [-cisvx] PATTERN [FILE...]\n" \ "\tgrepcidr [-V] [-cisvx] [-e PATTERN | -f PATFILE] [FILE...]\n" #define TXT_USAGE2 "grepcidr: Specify PATTERN or -f FILE to read patterns from\n" #define TXT_BADPAT "grepcidr: Not a valid pattern" #define TXT_FATAL "grepcidr: Fatal error: unexpected size of data type(s) on this system!\n" #define TXT_MEMORY "grepcidr: Fatal error: out of memory!\n" /* Use GREPERROR instead of perror */ #define GREPERROR(prefix) fprintf(stderr, "grepcidr: %s: %s\n", prefix, strerror(errno)); #define MAXFIELD 512 #define TOKEN_SEPS " \t,\r\n" /* so user can specify multiple patterns on command line */ #define INIT_NETWORKS 8192 /* Specifies a network. Whether originally in CIDR format (IP/mask) or a range of IPs (IP_start-IP_end), spec is converted to a range. The range is min to max (32-bit IPs) inclusive. */ struct netspec { unsigned int min; unsigned int max; }; /* IPv6 version of pattern */ struct netspec6 { unsigned char min[16]; unsigned char max[16]; }; /* Macro to test for valid IP address in four integers */ #define VALID_IP(IP) ((IP[0]<256) && (IP[1]<256) && (IP[2]<256) && (IP[3]<256)) /* Macro to build 32-bit IP from four integers */ #define BUILD_IP(IP) ((IP[0]<<24) | (IP[1]<<16) | (IP[2]<<8) | IP[3]) /* Parameters and macros for hints-based search */ #define HINT_LOOKAHEAD 4 /* e.g. if hints looks at P[4], then use 4 */ #define IPV4_FIELD "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz." #define IPV4_BUFSIZE 16 #define IPV4_HINT(P) (isdigit((int)P[0]) && ((P[1]=='.') || (P[2]=='.') || (P[3]=='.'))) #define IPV6_FIELD "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz:." #define IPV6_BUFSIZE 46 #define IPV6_HINT1(P) ((P[0]==':') && (P[1]==':') && isxdigit((int)P[2])) #define IPV6_HINT2(P) (isxdigit((int)P[0]) && (P[1]==':')) #define IPV6_HINT3(P) (isxdigit((int)P[0]) && isxdigit((int)P[1]) && (P[2]==':')) #define IPV6_HINT4(P) (isxdigit((int)P[0]) && isxdigit((int)P[1]) && isxdigit((int)P[2]) && (P[3]==':')) #define IPV6_HINT5(P) (isxdigit((int)P[0]) && isxdigit((int)P[1]) && isxdigit((int)P[2]) && isxdigit((int)P[3]) && (P[4]==':')) /* Global variables */ int anymatch = 0; /* did anything match? for exit code */ int invert = 0; /* flag for inverted mode */ unsigned int counting = 0; /* when non-zero, counts matches */ int include_noip = 0; /* flag to include lines without IPs when inverting */ int strict_align = 0; /* flag to enforce strict base alignment */ int strict_nosearch = 0; /* flag for original style, single IP match */ int match_one = 0; /* for -v, have matched one IP on this line */ int seen_ip = 0; /* for -v, have seen an IP on this line */ int shownames = 0; /* show file names with output lines */ unsigned int patterns = 0; /* total patterns in IPv4 array */ unsigned int capacity = 0; /* current capacity of IPv4 array */ struct netspec* array = NULL; /* IPv4 array of patterns */ unsigned int patterns6 = 0; /* total patterns in IPv6 array */ unsigned int capacity6 = 0; /* current capacity of IPv6 array */ struct netspec6* array6 = NULL; /* IPv6 array of patterns */ /* Insert new spec inside array of network spec Dynamically grow array buffer as needed The array must have already been initially allocated, with valid capacity */ void array_insert(struct netspec* newspec) { if (patterns == capacity) { capacity *= 2; array = realloc(array, capacity*sizeof(struct netspec)); } array[patterns++] = *newspec; } void array_insert6(struct netspec6* newspec) { if (patterns6 == capacity6) { capacity6 *= 2; array6 = realloc(array6, capacity6*sizeof(struct netspec6)); } array6[patterns6++] = *newspec; } /* Convert IPv4 address string at location p, string length len, into result which must point to an unsigned int. Returns 1 on success, 0 on failure */ int ipv4_to_uint(const char* p, unsigned long len, unsigned int* result) { unsigned char parsed[4] = { 0 }; char buf[IPV4_BUFSIZE]; if (len > IPV4_BUFSIZE-1) return 0; /* too long to be a valid IPv4 */ memset(buf, 0, sizeof(buf)); memcpy(buf, p, len); if (inet_pton(AF_INET, buf, &parsed) == 1) { *result = BUILD_IP(parsed); return 1; } else return 0; } /* Convert IPv6 address string at location p, string length len, into result which must point to 16 byte unsigned char array. This uses system's inet_pton() which is quite fast on Linux. Returns 1 on success, 0 on failure */ int ipv6_to_uchar(const char* p, unsigned long len, unsigned char* result) { char buf[IPV6_BUFSIZE]; if (len > IPV6_BUFSIZE-1) return 0; /* too long to be a valid IPv6 */ memset(buf, 0, sizeof(buf)); memcpy(buf, p, len); if (inet_pton(AF_INET6, buf, result) == 1) return 1; else return 0; } /* Increment IPv6 address (array at input) and store result. Both input and result must point to 16 byte unsigned char array. */ void ipv6_increment(unsigned char* input, unsigned char* result) { int i, carry=1; for (i=15; i>=0; i--) /* network byte order is big endian */ { int sum = input[i] + carry; result[i] = (unsigned char)(sum & 0xFF); carry = sum >> 8; } } /* Given string, fills in the struct netspec (must be allocated) Accept CIDR IP/mask format or IP_start-IP_end range. Returns true (nonzero) on success, false (zero) on failure. */ int net_parse(const char* line, struct netspec* spec) { unsigned int IP1[4], IP2[4]; int maskbits = 32; /* if using CIDR IP/mask format */ /* Try parsing IP/mask, CIDR format */ if (strchr(line, '/') && (sscanf(line, "%u.%u.%u.%u/%d", &IP1[0], &IP1[1], &IP1[2], &IP1[3], &maskbits) == 5) && VALID_IP(IP1)) { unsigned int ipaddress = BUILD_IP(IP1); if (maskbits == 0) { if (strict_align && (ipaddress != 0)) return 0; /* invalid */ spec->min = 0; spec->max = 0xFFFFFFFF; return 1; } else if ((maskbits < 0) || (maskbits > 32)) return 0; /* invalid */ if (strict_align && (ipaddress & (((1 << (32-maskbits))-1) & 0xFFFFFFFF))) return 0; /* invalid, there are non-zero host bits */ spec->min = ipaddress & (~((1 << (32-maskbits))-1) & 0xFFFFFFFF); spec->max = spec->min | (((1 << (32-maskbits))-1) & 0xFFFFFFFF); return 1; } /* Try parsing a range. Spaces around hyphen are optional. */ else if (strchr(line, '-') && (sscanf(line, "%u.%u.%u.%u - %u.%u.%u.%u", &IP1[0], &IP1[1], &IP1[2], &IP1[3], &IP2[0], &IP2[1], &IP2[2], &IP2[3]) == 8) && VALID_IP(IP1) && VALID_IP(IP2)) { spec->min = BUILD_IP(IP1); spec->max = BUILD_IP(IP2); if (spec->max >= spec->min) return 1; else return 0; } /* Try simple IP address */ else if ((sscanf(line, "%u.%u.%u.%u", &IP1[0], &IP1[1], &IP1[2], &IP1[3]) == 4) && VALID_IP(IP1)) { spec->min = BUILD_IP(IP1); spec->max = spec->min; return 1; } return 0; /* could not parse */ } /* Parse an IPv6 pattern (struct netspec6) Accepts IP or IP/x format Returns true (nonzero) on success, false (zero) on failure. */ int net_parse6(const char* line, struct netspec6* v6spec) { size_t field_len = strspn(line, IPV6_FIELD); unsigned char address[16] = { 0 }; int maskbits = 128; if (!ipv6_to_uchar(line, field_len, address)) return 0; /* no IPv6 found here */ /* Simple IPv6 address is in address */ memcpy(v6spec->min, address, 16); memcpy(v6spec->max, address, 16); if (sscanf(line+field_len, "/%d", &maskbits) == 1) { unsigned char mask; int bytenum; if ((maskbits < 0) || (maskbits > 128)) return 0; /* invalid */ if (maskbits == 0) bytenum = -1; else { bytenum = (maskbits-1)/8; mask = (unsigned char)0xFF << (7 - ((maskbits-1)%8)); v6spec->min[bytenum] &= mask; v6spec->max[bytenum] |= (unsigned char)~mask; } for (++bytenum; bytenum<16; bytenum++) { v6spec->min[bytenum] = 0; v6spec->max[bytenum] = 0xFF; } if (strict_align && (memcmp(v6spec->min, address, 16) != 0)) return 0; /* bad CIDR alignment */ } return 1; } /* Compare two netspecs, for sorting. Comparison is done on minimum of range */ int netsort(const void* a, const void* b) { unsigned int c1 = ((struct netspec*)a)->min; unsigned int c2 = ((struct netspec*)b)->min; if (c1 < c2) return -1; if (c1 > c2) return +1; return 0; } int netsort6(const void* a, const void* b) { unsigned char* c1 = ((struct netspec6*)a)->min; unsigned char* c2 = ((struct netspec6*)b)->min; int n = memcmp(c1, c2, 16); if (n < 0) return -1; if (n > 0) return +1; return 0; } /* Compare two netspecs, for searching. Test if key (only min) is inside range */ int netsearch(const void* a, const void* b) { unsigned int key = ((struct netspec*)a)->min; unsigned int min = ((struct netspec*)b)->min; unsigned int max = ((struct netspec*)b)->max; if (key < min) return -1; if (key > max) return +1; return 0; } int netsearch6(const void* a, const void* b) { unsigned char* key = ((struct netspec6*)a)->min; unsigned char* min = ((struct netspec6*)b)->min; unsigned char* max = ((struct netspec6*)b)->max; if (memcmp(key, min, 16) < 0) return -1; if (memcmp(key, max, 16) > 0) return +1; return 0; } /* Action to take upon a matching line, print the line or count it */ void print_or_count(char* line, const char* filename) { anymatch = 1; if (counting) counting++; else { if (filename && shownames) printf("%s:", filename); printf("%s", line); } } /* Search for this IP (passed in key) among loaded network patterns and determine if it's a "match" Provide either an IPv4 or IPv6 key, but not both. Returns true or false, whether IP matched patterns. */ int match_ip(struct netspec* v4key, struct netspec6* v6key, char* line, const char* filename) { int match = 0; seen_ip = 1; if (v4key && bsearch(v4key, array, patterns, sizeof(struct netspec), netsearch)) match = 1; else if (v6key && bsearch(v6key, array6, patterns6, sizeof(struct netspec6), netsearch6)) match = 1; if (match) { match_one = 1; if (!invert) print_or_count(line, filename); /* take action if not using -v */ } return match; } /* Load patterns defining networks */ void load_patterns(const char* pat_filename, char* pat_strings) { if (pat_filename) { FILE* data = fopen(pat_filename, "r"); if (data) { char line[MAXFIELD]; while (fgets(line, sizeof(line), data)) { struct netspec ipv4_pat; struct netspec6 ipv6_pat; if ((*line=='#')||(*line=='\n')||(*line=='\r')) continue; /* skip blank lines and comments */ if (net_parse(line, &ipv4_pat)) array_insert(&ipv4_pat); else if (net_parse6(line, &ipv6_pat)) array_insert6(&ipv6_pat); else fprintf(stderr, TXT_BADPAT ": %s", line); } fclose(data); } else { GREPERROR(pat_filename); exit(EXIT_ERROR); } } if (pat_strings) { char* token = strtok(pat_strings, TOKEN_SEPS); while (token) { struct netspec ipv4_pat; struct netspec6 ipv6_pat; if (net_parse(token, &ipv4_pat)) array_insert(&ipv4_pat); else if (net_parse6(token, &ipv6_pat)) array_insert6(&ipv6_pat); else fprintf(stderr, TXT_BADPAT ": %s\n", token); token = strtok(NULL, TOKEN_SEPS); } } /* Prepare array for rapid searching */ if (patterns) { unsigned int item; qsort(array, patterns, sizeof(struct netspec), netsort); /* cure overlaps so that ranges are disjoint and consistent */ for (item=1; item= argc) inp_stream = stdin; else { /* One or more file names are specified on the command line */ if (optind+1 < argc) shownames = 1; /* more than one file */ curfilename = argv[optind++]; inp_stream = fopen(curfilename, "r"); if (!inp_stream) { GREPERROR(curfilename); return EXIT_ERROR; } } /* Ready to search this stream or file */ search_stream(inp_stream, curfilename); if (inp_stream != stdin) fclose(inp_stream); } while (optind < argc); if (counting) printf("%u\n", counting-1); /* Cleanup */ if (array) free(array); if (array6) free(array6); if (anymatch) return EXIT_OK; else return EXIT_NOMATCH; } grepcidr-2.0/grepcidr.sgml0000600000175000017500000001744012266566672015511 0ustar jberkesjberkes Jem Berkes
jem@berkes.ca
2013 Jem Berkes Jan 4, 2014 GREPCIDR 1 grepcidr Filter IPv4 and IPv6 addresses matching CIDR patterns grepcidr PATTERN grepcidr | DESCRIPTION grepcidr can be used to filter a list of IP addresses against one or more Classless Inter-Domain Routing (CIDR) specifications. As with grep, there are options to invert matching and load patterns from a file. grepcidr is capable of efficiently processing large numbers of IPs and networks. OPTIONS Show software version Display count of the matching lines, instead of showing the lines Inverse match, include lines without an IP, implies -v Enforce strict alignment of CIDR mask; host portion must be all zero Invert the sense of matching, output lines with IPs that don't match Strict matching, only look at start of line Specify individual IP or CIDR pattern(s) on command-line Load individual IP or CIDR pattern(s) from file USAGE NOTES PATTERN specified on the command line may contain multiple patterns separated by whitespace or commas. For long lists of network patterns, use to load a file where each line contains one pattern (can be IPv4 or IPv6). Blank lines and comments starting with # are ignored. Each IPv4 pattern, whether on command line or loaded from a file, may be: a.b.c.d/xy (CIDR format) a.b.c.d-e.f.g.h (IP range) a.b.c.d (Single IP) And similarly for IPv6: a:b:c::/xyz (CIDR format) a:b:c:: (Single IP) Dotted-decimal IPv4 format, or any legal IPv6 format is supported (see: man inet_pton). IP addresses that appear anywhere on the input line will be compared and matched against the patterns. To be recognized, an IP (field) must end with terminating text. An IPv4 field terminates upon anything other than alphanumeric or dot. An IPv6 field terminates upon anything other than alphanumeric, dot, or colon. This is to prevent accidental matching of ambiguous text such as host names containing reverse DNS. Use the option to do a strict parse without searching the whole line, and grepcidr will only look for the single IP at the start of the line. EXAMPLES grepcidr -f ournetworks blacklist > abuse.log Find customers (CIDR ranges in file) that appear in blacklist grepcidr 2001:db8::/32 log.1 log.2 Search for this IPv6 network inside two files grepcidr 127.0.0.0/8 iplog Searches for any localnet IP addresses inside the iplog file grepcidr "192.168.0.1-192.168.10.13" iplog Searches for IPs matching indicated range in the iplog file script | grepcidr -vf whitelist > blacklist Create a blacklist, with whitelisted networks removed (inverse) grepcidr -f list1 list2 Cross-reference two lists, outputs IPs common to both lists EXIT STATUS As with grep: the exit status is 0 if matching IPs are found, and 1 if not found. If an error occurred the exit status is 2. AUTHOR This software and manual page was written by Jem Berkes <jem@berkes.ca> based on the first man page and DocBook format contributed by Ryan Finnie. Permission is granted to copy, distribute and/or modify this document under the terms of the GNU General Public License, Version 2 or any later version published by the Free Software Foundation. WEB SITE http://www.pc-tools.net/unix/grepcidr/ THANKS Sponsored in part by the Spamhaus Project, http://www.spamhaus.org/ Thanks to John Levine <johnl@taugh.com> for sharing his alternative implementation. I used a couple ideas from his code, such as portable 128-bit numbers and support for multiple input files. However, John's version is quite different and represents a significant fork in the project. Thanks to Ryan Finnie <ryan@finnie.org> for his work on the Debian package. I've adopted several of his changes including the Makefile, and the DocBook format which now is the source of the man page. Thanks to Ryan for writing the first manual in DocBook format. Many thanks to Dick Wesseling <ftu@fi.uu.nl> who suggested an improved data structure format as well as binary search, to improve grepcidr performance. grepcidr-2.0/README0000600000175000017500000001040612266421240013656 0ustar jberkesjberkesgrepcidr 2.0 - Filter IPv4 and IPv6 addresses matching CIDR patterns Copyright (C) 2004 - 2014 Jem E. Berkes http://www.pc-tools.net/unix/grepcidr/ http://www.berkes.ca/ Sponsored in part by the Spamhaus Project, http://www.spamhaus.org/ DESCRIPTION ----------- grepcidr can be used to filter a list of IP addresses against one or more Classless Inter-Domain Routing (CIDR) specifications. As with grep, there are options to invert matching and load patterns from a file. grepcidr is capable of efficiently processing large numbers of IPs and networks. grepcidr has endless uses in network software, including: mail filtering and processing, network security, log analysis, and many custom applications. COMPILING & INSTALLING ---------------------- make make doc make install COMMAND USAGE ------------- grepcidr [-V] [-cisvx] PATTERN [FILE...] grepcidr [-V] [-cisvx] [-e PATTERN | -f PATFILE] [FILE...] -V Show software version -c Display count of the matching lines, instead of showing the lines -i Inverse match, include lines without an IP, implies -v -s Enforce strict alignment of CIDR mask; host portion must be all zero -v Invert the sense of matching, output lines with IPs that don't match -x Strict matching, only look at start of line -e Specify individual IP or CIDR pattern(s) on command-line -f Load individual IP or CIDR pattern(s) from file MAJOR 2.0 CHANGES ----------------- Version 2.0 adds support for IPv6 addresses. As with 1.4, version 2.0 finds IP addresses anywhere on the line. Use -x to search only from the start of line, like versions 1.3 and earlier. USAGE NOTES ----------- PATTERN specified on the command line may contain multiple patterns separated by whitespace or commas. For long lists of network patterns, use -f to load a file where each line contains one pattern (can be IPv4 or IPv6). Blank lines and comments starting with # are ignored. Each IPv4 pattern, whether on command line or loaded from a file, may be: a.b.c.d/xy (CIDR format) a.b.c.d-e.f.g.h (IP range) a.b.c.d (Single IP) And similarly for IPv6: a:b:c::/xyz (CIDR format) a:b:c:: (Single IP) Dotted-decimal IPv4 format, or any legal IPv6 format is supported (see: man inet_pton). IP addresses that appear anywhere on the input line will be compared and matched against the patterns. To be recognized, an IP (field) must end with terminating text. An IPv4 field terminates upon anything other than alphanumeric or dot. An IPv6 field terminates upon anything other than alphanumeric, dot, or colon. This is to prevent accidental matching of ambiguous text such as host names containing reverse DNS. Use the -x option to do a strict parse without searching the whole line, and grepcidr will only look for the single IP at the start of the line. EXAMPLES -------- grepcidr -f ournetworks blacklist > abuse.log Find customers (CIDR ranges in file) that appear in blacklist grepcidr 2001:db8::/32 log.1 log.2 Search for this IPv6 network inside two files grepcidr 127.0.0.0/8 iplog Searches for any localnet IP addresses inside the iplog file grepcidr "192.168.0.1-192.168.10.13" iplog Searches for IPs matching indicated range in the iplog file script | grepcidr -vf whitelist > blacklist Create a blacklist, with whitelisted networks removed (inverse) grepcidr -f list1 list2 Cross-reference two lists, outputs IPs common to both lists EXIT STATUS ----------- As with grep: the exit status is 0 if matching IPs are found, and 1 if not found. If an error occurred the exit status is 2. THANKS ------ Sponsored in part by the Spamhaus Project, http://www.spamhaus.org/ Thanks to John Levine for sharing his alternative implementation. I used a couple ideas from his code, such as portable 128-bit numbers and support for multiple input files. However, John's version is quite different and represents a significant fork in the project. Thanks to Ryan Finnie for his work on the Debian package. I've adopted several of his changes including the Makefile, and the DocBook format which now is the source of the man page. Thanks to Ryan for writing the first manual in DocBook format. Many thanks to Dick Wesseling who suggested an improved data structure format as well as binary search, to improve grepcidr performance. grepcidr-2.0/Makefile0000600000175000017500000000124612256223406014443 0ustar jberkesjberkesDESTDIR= PREFIX=/usr/local DATAROOTDIR=$(PREFIX)/share DATADIR=$(DATAROOTDIR) EXEC_PREFIX=$(PREFIX) BINDIR=$(EXEC_PREFIX)/bin SBINDIR=$(EXEC_PREFIX)/sbin MANDIR=$(DATAROOTDIR)/man INFODIR=$(DATAROOTDIR)/info CPPFLAGS= CFLAGS=-O3 -Wall -Werror LDFLAGS= all: grepcidr grepcidr: grepcidr.o $(CC) $(CFLAGS) grepcidr.o -o grepcidr doc: grepcidr.1 grepcidr.1: grepcidr.sgml docbook-to-man $< >$@ install: grepcidr install -m 0755 -d $(DESTDIR)$(BINDIR) install -m 0755 grepcidr $(DESTDIR)$(BINDIR)/grepcidr install -m 0755 -d $(DESTDIR)$(MANDIR)/man1 install -m 0644 grepcidr.1 $(DESTDIR)$(MANDIR)/man1/grepcidr.1 clean: rm -f grepcidr *.o doc-clean: rm -f grepcidr.1 grepcidr-2.0/ChangeLog0000600000175000017500000000376212327361112014556 0ustar jberkesjberkesVersion 2.0, 2014-04-27 ======================= * Added IPv6 support * Replaced regex with 'hints' scanner (2x to 10x faster on some platforms) * IP text now require strict termination, avoids matching reverse DNS * Now complains about bad pattern formats instead of silently ignoring * Supports multiple file names on command line, like regular grep * Updated Makefile to be FreeBSD-friendly; also now includes -O3 * Fixed invert (-v) logic and added -i to include lines without an IP * Now supports unlimited line length within input stream/file * Added -s option to enforce strict alignment of CIDR mask * Fixed bug, now recognizes /0 and 0.0.0.0 Version 1.4, 2013-11-20 ======================= * Default behaviour in 1.4 has changed to search anywhere on line * Includes regex to search anywhere on line (based on Jeff Makey's patch) * Added -x option to search without regex, old-style strict (faster) * Makefile and packaging update rollup, courtesy Ryan Finnie * Adopted DocBook man format, contributed by Ryan Finnie * Enhanced documentation and manual page * Increased maximum line length to 1024 bytes Version 1.3, 2005-04-23 ======================= * Much faster than past versions due to binary search of patterns * Decreased memory usage * Applied search improvements suggested by Dick Wesseling * Now supports IP ranges as well as CIDR format * Improved usage to be more grep-like (e.g. filename on command line) * Now uses grep-like exit code (0=ok, 1=no match, 2=error) Version 1.2, 2004-04-23 ======================= * Improved algorithm for faster processing with large number of patterns (approx. 50 times as fast on test set, with specs from diverse regions) version 1.1, 2004-02-16 ======================= * New algorithm has increased speed by about 2.4 times! * Added -c (count) option, like grep * Reduced memory usage in case loading large files (-f) * Added simple Makefile version 1.0, 2004-02-14 ======================= * First public release grepcidr-2.0/grepcidr.10000600000175000017500000001126212266666270014676 0ustar jberkesjberkes.TH "GREPCIDR" "1" .SH "NAME" grepcidr \(em Filter IPv4 and IPv6 addresses matching CIDR patterns .SH "SYNOPSIS" .PP \fBgrepcidr\fR [\fB\fIOPTIONS\fR\fP] PATTERN [\fB\fIFILE...\fR\fP] .PP \fBgrepcidr\fR [\fB\fIOPTIONS\fR\fP] [\fB-e \fIPATTERN\fR\fP | \fB-f \fIPATFILE\fR\fP] [\fB\fIFILE...\fR\fP] .SH "DESCRIPTION" .PP \fBgrepcidr\fR can be used to filter a list of IP addresses against one or more Classless Inter-Domain Routing (CIDR) specifications. As with grep, there are options to invert matching and load patterns from a file. \fBgrepcidr\fR is capable of efficiently processing large numbers of IPs and networks. .SH "OPTIONS" .IP "\fB-V\fP" 10 Show software version .IP "\fB-c\fP" 10 Display count of the matching lines, instead of showing the lines .IP "\fB-i\fP" 10 Inverse match, include lines without an IP, implies \-v .IP "\fB-s\fP" 10 Enforce strict alignment of CIDR mask; host portion must be all zero .IP "\fB-v\fP" 10 Invert the sense of matching, output lines with IPs that don't match .IP "\fB-x\fP" 10 Strict matching, only look at start of line .IP "\fB-e\fP" 10 Specify individual IP or CIDR pattern(s) on command-line .IP "\fB-f\fP" 10 Load individual IP or CIDR pattern(s) from file .SH "USAGE NOTES" .PP PATTERN specified on the command line may contain multiple patterns separated by whitespace or commas. For long lists of network patterns, use \fB-f\fP to load a file where each line contains one pattern (can be IPv4 or IPv6). Blank lines and comments starting with # are ignored. .PP Each IPv4 pattern, whether on command line or loaded from a file, may be: .PP .nf a.b.c.d/xy (CIDR format) a.b.c.d-e.f.g.h (IP range) a.b.c.d (Single IP) .fi .PP .PP And similarly for IPv6: .PP .nf a:b:c::/xyz (CIDR format) a:b:c:: (Single IP) .fi .PP .PP Dotted-decimal IPv4 format, or any legal IPv6 format is supported (see: man inet_pton). .PP IP addresses that appear anywhere on the input line will be compared and matched against the patterns. To be recognized, an IP (field) must end with terminating text. An IPv4 field terminates upon anything other than alphanumeric or dot. An IPv6 field terminates upon anything other than alphanumeric, dot, or colon. This is to prevent accidental matching of ambiguous text such as host names containing reverse DNS. .PP Use the \fB-x\fP option to do a strict parse without searching the whole line, and \fBgrepcidr\fR will only look for the single IP at the start of the line. .SH "EXAMPLES" .PP \fI\fBgrepcidr\fR \-f ournetworks blacklist > abuse.log\fP .PP Find customers (CIDR ranges in file) that appear in blacklist .PP \fI\fBgrepcidr\fR 2001:db8::/32 log.1 log.2\fP .PP Search for this IPv6 network inside two files .PP \fI\fBgrepcidr\fR 127.0.0.0/8 iplog\fP .PP Searches for any localnet IP addresses inside the iplog file .PP \fI\fBgrepcidr\fR "192.168.0.1-192.168.10.13" iplog\fP .PP Searches for IPs matching indicated range in the iplog file .PP \fI\fBscript\fR | \fBgrepcidr\fR \-vf whitelist > blacklist\fP .PP Create a blacklist, with whitelisted networks removed (inverse) .PP \fI\fBgrepcidr\fR \-f list1 list2\fP .PP Cross-reference two lists, outputs IPs common to both lists .SH "EXIT STATUS" .PP As with grep: the exit status is 0 if matching IPs are found, and 1 if not found. If an error occurred the exit status is 2. .SH "AUTHOR" .PP This software and manual page was written by Jem Berkes based on the first man page and DocBook format contributed by Ryan Finnie. Permission is granted to copy, distribute and/or modify this document under the terms of the GNU General Public License, Version 2 or any later version published by the Free Software Foundation. .SH "WEB SITE" .PP http://www.pc-tools.net/unix/grepcidr/ .SH "THANKS" .PP Sponsored in part by the Spamhaus Project, http://www.spamhaus.org/ .PP Thanks to John Levine for sharing his alternative implementation. I used a couple ideas from his code, such as portable 128-bit numbers and support for multiple input files. However, John's version is quite different and represents a significant fork in the project. .PP Thanks to Ryan Finnie for his work on the Debian package. I've adopted several of his changes including the Makefile, and the DocBook format which now is the source of the man page. Thanks to Ryan for writing the first manual in DocBook format. .PP Many thanks to Dick Wesseling who suggested an improved data structure format as well as binary search, to improve grepcidr performance. .\" created by instant / docbook-to-man, Sun 19 Jan 2014, 01:12