mirror of https://github.com/M66B/NetGuard.git
75 lines
2.6 KiB
C
75 lines
2.6 KiB
C
/*
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This file is part of NetGuard.
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NetGuard is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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NetGuard is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with NetGuard. If not, see <http://www.gnu.org/licenses/>.
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Copyright 2015-2018 by Marcel Bokhorst (M66B)
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*/
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#include "netguard.h"
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FILE *pcap_file = NULL;
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size_t pcap_record_size = 64;
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long pcap_file_size = 2 * 1024 * 1024;
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void write_pcap_hdr() {
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struct pcap_hdr_s pcap_hdr;
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pcap_hdr.magic_number = 0xa1b2c3d4;
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pcap_hdr.version_major = 2;
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pcap_hdr.version_minor = 4;
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pcap_hdr.thiszone = 0;
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pcap_hdr.sigfigs = 0;
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pcap_hdr.snaplen = pcap_record_size;
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pcap_hdr.network = LINKTYPE_RAW;
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write_pcap(&pcap_hdr, sizeof(struct pcap_hdr_s));
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}
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void write_pcap_rec(const uint8_t *buffer, size_t length) {
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struct timespec ts;
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if (clock_gettime(CLOCK_REALTIME, &ts))
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log_android(ANDROID_LOG_ERROR, "clock_gettime error %d: %s", errno, strerror(errno));
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size_t plen = (length < pcap_record_size ? length : pcap_record_size);
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struct pcaprec_hdr_s pcap_rec;
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pcap_rec.ts_sec = (guint32_t) ts.tv_sec;
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pcap_rec.ts_usec = (guint32_t) (ts.tv_nsec / 1000);
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pcap_rec.incl_len = (guint32_t) plen;
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pcap_rec.orig_len = (guint32_t) length;
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write_pcap(&pcap_rec, sizeof(struct pcaprec_hdr_s));
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write_pcap(buffer, plen);
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}
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void write_pcap(const void *ptr, size_t len) {
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if (fwrite(ptr, len, 1, pcap_file) < 1)
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log_android(ANDROID_LOG_ERROR, "PCAP fwrite error %d: %s", errno, strerror(errno));
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else {
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long fsize = ftell(pcap_file);
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log_android(ANDROID_LOG_VERBOSE, "PCAP wrote %d @%ld", len, fsize);
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if (fsize > pcap_file_size) {
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log_android(ANDROID_LOG_WARN, "PCAP truncate @%ld", fsize);
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if (ftruncate(fileno(pcap_file), sizeof(struct pcap_hdr_s)))
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log_android(ANDROID_LOG_ERROR, "PCAP ftruncate error %d: %s",
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errno, strerror(errno));
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else {
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if (!lseek(fileno(pcap_file), sizeof(struct pcap_hdr_s), SEEK_SET))
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log_android(ANDROID_LOG_ERROR, "PCAP ftruncate error %d: %s",
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errno, strerror(errno));
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}
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}
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}
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}
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