dev: make paths unlikely, simplify code

[netsniff-ng.git] / geoip.c

/*
 * netsniff-ng - the packet sniffing beast
 * Copyright 2013 Daniel Borkmann.
 * Subject to the GPL, version 2.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <GeoIP.h>
#include <GeoIPCity.h>
#include <netinet/in.h>
#include <netdb.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>

#include "built_in.h"
#include "die.h"
#include "ioops.h"
#include "str.h"
#include "xmalloc.h"
#include "zlib.h"
#include "geoip.h"

struct file {
        const char *desc, *local;
        const char *remote, *possible_prefix;
};

#define PRE     "/download/geoip/database"
static const struct file files[] = {
        [GEOIP_CITY_EDITION_REV1] = {
                        .desc = "City IPv4",
                        .local = PREFIX_STRING "/etc/netsniff-ng/city4.dat",
                        .remote = "/GeoLiteCity.dat.gz",
                        .possible_prefix = PRE,
                },
        [GEOIP_CITY_EDITION_REV1_V6] = {
                        .desc = "City IPv6",
                        .local = PREFIX_STRING "/etc/netsniff-ng/city6.dat",
                        .remote = "/GeoLiteCityv6.dat.gz",
                        .possible_prefix = PRE "/GeoLiteCityv6-beta",
                },
        [GEOIP_COUNTRY_EDITION] = {
                        .desc = "Country IPv4",
                        .local = PREFIX_STRING "/etc/netsniff-ng/country4.dat",
                        .remote = "/GeoIP.dat.gz",
                        .possible_prefix = PRE "/GeoLiteCountry",
                },
        [GEOIP_COUNTRY_EDITION_V6] = {
                        .desc = "Country IPv6",
                        .local = PREFIX_STRING "/etc/netsniff-ng/country6.dat",
                        .remote = "/GeoIPv6.dat.gz",
                        .possible_prefix = PRE,
                },
        [GEOIP_ASNUM_EDITION] = {
                        .desc = "AS Numbers IPv4",
                        .local = PREFIX_STRING "/etc/netsniff-ng/asname4.dat",
                        .remote = "/GeoIPASNum.dat.gz",
                        .possible_prefix = PRE "/asnum",
                },
        [GEOIP_ASNUM_EDITION_V6] = {
                        .desc = "AS Numbers IPv6",
                        .local = PREFIX_STRING "/etc/netsniff-ng/asname6.dat",
                        .remote = "/GeoIPASNumv6.dat.gz",
                        .possible_prefix = PRE "/asnum",
                },
};

static GeoIP *gi4_asname = NULL, *gi6_asname = NULL;
static GeoIP *gi4_country = NULL, *gi6_country = NULL;
static GeoIP *gi4_city = NULL, *gi6_city = NULL;

static GeoIPRecord empty = { 0 };

static char *servers[16] = { 0 };

#define CITYV4          (1 << 0)
#define CITYV6          (1 << 1)
#define COUNTRYV4       (1 << 2)
#define COUNTRYV6       (1 << 3)
#define ASNAMV4         (1 << 4)
#define ASNAMV6         (1 << 5)

#define HAVEALL         (CITYV4 | CITYV6 | COUNTRYV4 | COUNTRYV6 | ASNAMV4 | ASNAMV6)

static int geoip_db_present = 0;

int geoip_working(void)
{
        return geoip_db_present == HAVEALL;
}

static int geoip_get_remote_fd(const char *server, const char *port)
{
        int ret, fd = -1;
        struct addrinfo hints, *ahead, *ai;

        bug_on(!server || !port);

        memset(&hints, 0, sizeof(hints));

        hints.ai_family = PF_UNSPEC;
        hints.ai_socktype = SOCK_STREAM;
        hints.ai_protocol = IPPROTO_TCP;
        hints.ai_flags = AI_NUMERICSERV;

        ret = getaddrinfo(server, port, &hints, &ahead);
        if (ret != 0)
                return -EIO;

        for (ai = ahead; ai != NULL && fd < 0; ai = ai->ai_next) {
                fd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
                if (fd < 0)
                        continue;

                ret = connect(fd, ai->ai_addr, ai->ai_addrlen);
                if (ret < 0) {
                        close(fd);
                        fd = -1;
                        continue;
                }

                break;
        }

        freeaddrinfo(ahead);

        return fd;
}

static void geoip_inflate(int which)
{
        int ret, ret2 = 1;
        gzFile fpi;
        FILE *fpo;
        char zfile[128], raw[4096];

        slprintf(zfile, sizeof(zfile), "%s.gz", files[which].local);
        fpi = gzopen(zfile, "rb");
        if (fpi == NULL)
                panic("No %s file!\n", zfile);

        fpo = fopen(files[which].local, "wb");
        if (fpo == NULL)
                panic("Cannot create %s!\n", files[which].local);

        while ((ret = gzread(fpi, raw, sizeof(raw))) && ret2)
                ret2 = fwrite(raw, ret, 1, fpo);

        gzclose(fpi);
        fclose(fpo);
}

static int geoip_get_database(const char *host, int which)
{
        int found, sock, fd, i, good, retry = 0;
        ssize_t ret, len, rtotlen = 0, totlen = 0;
        char raw[4096], *ptr, zfile[128];
        size_t lenl = strlen("Content-Length: ");
        size_t lent = strlen("HTTP/1.1 200 OK");
        size_t lenc = strlen("\r\n\r\n");

again:
        found = good = 0;
        ptr = NULL;
        len = 0;

        sock = geoip_get_remote_fd(host, "80");
        if (sock < 0)
                return -EIO;

        slprintf(raw, sizeof(raw), "GET %s%s HTTP/1.1\nHost: %s\r\n\r\n",
                 retry ? files[which].possible_prefix : "",
                 files[which].remote, host);

        ret = write(sock, raw, strlen(raw));
        if (ret <= 0) {
                close(sock);
                return -EIO;
        }

        shutdown(sock, SHUT_WR);

        slprintf(zfile, sizeof(zfile), "%s.gz", files[which].local);
        fd = open_or_die_m(zfile, O_WRONLY | O_CREAT | O_TRUNC, DEFFILEMODE);

        memset(raw, 0, sizeof(raw));
        ret = read(sock, raw, sizeof(raw));
        if (ret <= 0) {
                close(fd);
                close(sock);
                return -EIO;
        }

        raw[sizeof(raw) - 1] = 0;

        for (i = 0; i < ret; i++) {
                if (!strncmp(raw + i, "Content-Length: ", min(ret - i, lenl))) {
                        ptr = raw + i + lenl;
                        rtotlen = strtoul(ptr, NULL, 10);
                }

                if (!strncmp(raw + i, "HTTP/1.1 200 OK", min(ret - i, lent)))
                        good = 1;

                if (!strncmp(raw + i, "\r\n\r\n", min(ret - i, lenc))) {
                        ptr = raw + i + lenc;
                        len = ret - i - lenc;
                        found = 1;
                        break;
                }
        }

        if (!found || ptr >= raw + ret || len < 0 || rtotlen == 0 || good == 0) {
                close(fd);
                close(sock);

                if (retry == 0) {
                        retry = 1;
                        goto again;
                }

                return -ENOENT;
        }

        do {
                write_or_die(fd, ptr, len);
                totlen += len;
                printf("\r%s [%.2f%%, %zd/%zd, %s]", files[which].desc,
                       100.f * totlen / rtotlen, totlen, rtotlen, host);
                fflush(stdout);

                memset(raw, 0, sizeof(raw));
                ret = read(sock, raw, sizeof(raw));

                ptr = raw;
                len = ret;
        } while(ret > 0);

        printf("\n");

        close(fd);
        close(sock);

        if (totlen != rtotlen) {
                unlink(files[which].local);
                return -EIO;
        }

        geoip_inflate(which);
        unlink(zfile);

        return 0;
}

static GeoIPRecord *geoip4_get_record(struct sockaddr_in sa)
{
        bug_on(gi4_city == NULL);

        return GeoIP_record_by_ipnum(gi4_city, ntohl(sa.sin_addr.s_addr)) ? : &empty;
}

static GeoIPRecord *geoip6_get_record(struct sockaddr_in6 sa)
{
        bug_on(gi6_city == NULL);

        return GeoIP_record_by_ipnum_v6(gi6_city, sa.sin6_addr) ? : &empty;
}

const char *geoip4_as_name(struct sockaddr_in sa)
{
        bug_on(gi4_asname == NULL);

        return GeoIP_name_by_ipnum(gi4_asname, ntohl(sa.sin_addr.s_addr));
}

const char *geoip6_as_name(struct sockaddr_in6 sa)
{
        bug_on(gi6_asname == NULL);

        return GeoIP_name_by_ipnum_v6(gi6_asname, sa.sin6_addr);
}

float geoip4_longitude(struct sockaddr_in sa)
{
        return geoip4_get_record(sa)->longitude;
}

float geoip4_latitude(struct sockaddr_in sa)
{
        return geoip4_get_record(sa)->latitude;
}

float geoip6_longitude(struct sockaddr_in6 sa)
{
        return geoip6_get_record(sa)->longitude;
}

float geoip6_latitude(struct sockaddr_in6 sa)
{
        return geoip6_get_record(sa)->latitude;
}

const char *geoip4_city_name(struct sockaddr_in sa)
{
        return geoip4_get_record(sa)->city;
}

const char *geoip6_city_name(struct sockaddr_in6 sa)
{
        return geoip6_get_record(sa)->city;
}

const char *geoip4_region_name(struct sockaddr_in sa)
{
        return geoip4_get_record(sa)->region;
}

const char *geoip6_region_name(struct sockaddr_in6 sa)
{
        return geoip6_get_record(sa)->region;
}

const char *geoip4_country_name(struct sockaddr_in sa)
{
        bug_on(gi4_country == NULL);

        return GeoIP_country_name_by_ipnum(gi4_country, ntohl(sa.sin_addr.s_addr));
}

const char *geoip6_country_name(struct sockaddr_in6 sa)
{
        bug_on(gi6_country == NULL);

        return GeoIP_country_name_by_ipnum_v6(gi6_country, sa.sin6_addr);
}

static int fdout, fderr;

/* GeoIP people were too stupid to come to the idea that you could set
 * errno appropriately and return NULL instead of printing stuff from
 * the library directly that noone can turn off.
 */

static void geoip_open_prepare(void)
{
        fflush(stdout);
        fdout = dup_or_die(1);

        fflush(stderr);
        fderr = dup_or_die(2);

        close(1);
        close(2);
}

static void geoip_open_restore(void)
{
        dup2_or_die(fdout, 1);
        dup2_or_die(fderr, 2);

        close(fdout);
        close(fderr);
}

static GeoIP *geoip_open_type(int type, int flags)
{
        GeoIP *ret;

        geoip_open_prepare();
        ret = GeoIP_open_type(type, flags);
        geoip_open_restore();

        return ret;
}

static GeoIP *geoip_open(const char *filename, int flags)
{
        GeoIP *ret;

        geoip_open_prepare();
        ret = GeoIP_open(filename, flags);
        geoip_open_restore();

        return ret;
}

static void init_geoip_city_open4(int enforce)
{
        gi4_city = geoip_open(files[GEOIP_CITY_EDITION_REV1].local, GEOIP_MMAP_CACHE);
        if (gi4_city == NULL) {
                gi4_city = geoip_open_type(GEOIP_CITY_EDITION_REV1, GEOIP_MMAP_CACHE);
                if (gi4_city == NULL)
                        if (enforce)
                                panic("Cannot open GeoIP4 city database, try --update!\n");
        }

        if (gi4_city) {
                GeoIP_set_charset(gi4_city, GEOIP_CHARSET_UTF8);
                geoip_db_present |= CITYV4;
        }
}

static void init_geoip_city_open6(int enforce)
{
        gi6_city = geoip_open(files[GEOIP_CITY_EDITION_REV1_V6].local, GEOIP_MMAP_CACHE);
        if (gi6_city == NULL) {
                gi6_city = geoip_open_type(GEOIP_CITY_EDITION_REV1_V6, GEOIP_MMAP_CACHE);
                if (gi6_city == NULL)
                        if (enforce)
                                panic("Cannot open GeoIP6 city database, try --update!\n");
        }

        if (gi6_city) {
                GeoIP_set_charset(gi6_city, GEOIP_CHARSET_UTF8);
                geoip_db_present |= CITYV6;
        }
}

static void init_geoip_city(int enforce)
{
        init_geoip_city_open4(enforce);
        init_geoip_city_open6(enforce);
}

static void destroy_geoip_city(void)
{
        GeoIP_delete(gi4_city);
        GeoIP_delete(gi6_city);
}

static void init_geoip_country_open4(int enforce)
{
        gi4_country = geoip_open(files[GEOIP_COUNTRY_EDITION].local, GEOIP_MMAP_CACHE);
        if (gi4_country == NULL) {
                gi4_country = geoip_open_type(GEOIP_COUNTRY_EDITION, GEOIP_MMAP_CACHE);
                if (gi4_country == NULL)
                        if (enforce)
                                panic("Cannot open GeoIP4 country database, try --update!\n");
        }

        if (gi4_country) {
                GeoIP_set_charset(gi4_country, GEOIP_CHARSET_UTF8);
                geoip_db_present |= COUNTRYV4;
        }
}

static void init_geoip_country_open6(int enforce)
{
        gi6_country = geoip_open(files[GEOIP_COUNTRY_EDITION_V6].local, GEOIP_MMAP_CACHE);
        if (gi6_country == NULL) {
                gi6_country = geoip_open_type(GEOIP_COUNTRY_EDITION_V6, GEOIP_MMAP_CACHE);
                if (gi6_country == NULL)
                        if (enforce)
                                panic("Cannot open GeoIP6 country database, try --update!\n");
        }

        if (gi6_country) {
                GeoIP_set_charset(gi6_country, GEOIP_CHARSET_UTF8);
                geoip_db_present |= COUNTRYV6;
        }
}

static void init_geoip_country(int enforce)
{
        init_geoip_country_open4(enforce);
        init_geoip_country_open6(enforce);
}

static void destroy_geoip_country(void)
{
        GeoIP_delete(gi4_country);
        GeoIP_delete(gi6_country);
}

static void init_geoip_asname_open4(int enforce)
{
        gi4_asname = geoip_open(files[GEOIP_ASNUM_EDITION].local, GEOIP_MMAP_CACHE);
        if (gi4_asname == NULL) {
                gi4_asname = geoip_open_type(GEOIP_ASNUM_EDITION, GEOIP_MMAP_CACHE);
                if (gi4_asname == NULL)
                        if (enforce)
                                panic("Cannot open GeoIP4 AS database, try --update!\n");
        }

        if (gi4_asname) {
                GeoIP_set_charset(gi4_asname, GEOIP_CHARSET_UTF8);
                geoip_db_present |= ASNAMV4;
        }
}

static void init_geoip_asname_open6(int enforce)
{
        gi6_asname = geoip_open(files[GEOIP_ASNUM_EDITION_V6].local, GEOIP_MMAP_CACHE);
        if (gi6_asname == NULL) {
                gi6_asname = geoip_open_type(GEOIP_ASNUM_EDITION_V6, GEOIP_MMAP_CACHE);
                if (gi6_asname == NULL)
                        if (enforce)
                                panic("Cannot open GeoIP6 AS database, try --update!\n");
        }

        if (gi6_asname) {
                GeoIP_set_charset(gi6_asname, GEOIP_CHARSET_UTF8);
                geoip_db_present |= ASNAMV6;
        }
}

static void init_geoip_asname(int enforce)
{
        init_geoip_asname_open4(enforce);
        init_geoip_asname_open6(enforce);
}

static void destroy_geoip_asname(void)
{
        GeoIP_delete(gi4_asname);
        GeoIP_delete(gi6_asname);
}

static void init_mirrors(void)
{
        int i = 0;
        FILE *fp;
        char buff[256];

        fp = fopen(PREFIX_STRING "/etc/netsniff-ng/geoip.conf", "r");
        if (!fp)
                panic("Cannot open geoip.conf!\n");

        fmemset(buff, 0, sizeof(buff));
        while (fgets(buff, sizeof(buff), fp) != NULL &&
               i < array_size(servers)) {
                buff[sizeof(buff) - 1] = 0;
                buff[strlen(buff) - 1] = 0;

                if (buff[0] == '#') {
                        fmemset(buff, 0, sizeof(buff));
                        continue;
                }

                servers[i++] = xstrdup(buff);
                fmemset(buff, 0, sizeof(buff));
        }

        fclose(fp);
}

static void destroy_mirrors(void)
{
        int i;

        for (i = 0; i < array_size(servers); ++i)
                free(servers[i]);
}

void init_geoip(int enforce)
{
        init_geoip_city(enforce);
        init_geoip_country(enforce);
        init_geoip_asname(enforce);
}

void update_geoip(void)
{
        int i, j, ret, good = 0;

        init_mirrors();

        for (i = 0; i < array_size(files); ++i) {
                if (files[i].local && files[i].remote) {
                        good = 0;

                        for (j = 0; j < array_size(servers); ++j) {
                                if (servers[j] == NULL)
                                        continue;
                                ret = geoip_get_database(servers[j], i);
                                if (!ret) {
                                        good = 1;
                                        break;
                                }
                        }

                        if (good == 0)
                                panic("Cannot get %s from mirrors!\n",
                                      files[i].remote);
                }
        }

        destroy_mirrors();
}

void destroy_geoip(void)
{
        destroy_geoip_city();
        destroy_geoip_country();
        destroy_geoip_asname();

        geoip_db_present = 0;
}