46 lines
1.4 KiB
C
46 lines
1.4 KiB
C
/* Pi-hole: A black hole for Internet advertisements
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* (c) 2020 Pi-hole, LLC (https://pi-hole.net)
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* Network-wide ad blocking via your own hardware.
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*
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* FTL Engine
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* Pi-hole syscall implementation for sendto
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*
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* This file is copyright under the latest version of the EUPL.
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* Please see LICENSE file for your rights under this license. */
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#include "../FTL.h"
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//#include "syscalls.h" is implicitly done in FTL.h
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#include "../log.h"
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#include <sys/types.h>
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#include <sys/socket.h>
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#undef sendto
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ssize_t FTLsendto(int sockfd, void *buf, size_t len, int flags, const struct sockaddr *dest_addr, socklen_t addrlen, const char *file, const char *func, const int line)
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{
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ssize_t ret = 0;
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do
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{
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// Reset errno before trying to write
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errno = 0;
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ret = sendto(sockfd, buf, len, flags, dest_addr, addrlen);
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}
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// Try again if the last accept() call failed due to an interruption by an
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// incoming signal
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while(ret < 0 && errno == EINTR);
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// Backup errno value
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const int _errno = errno;
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// Final error checking (may have failed for some other reason then an
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// EINTR = interrupted system call), also ignore EPROTONOSUPPORT (ARP scanning)
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// and EPERM + ENOKEY (DHCP probing)
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if(ret < 0 && errno != EPROTONOSUPPORT && errno != EPERM && errno != ENOKEY)
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logg("WARN: Could not sendto() in %s() (%s:%i): %s",
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func, file, line, strerror(errno));
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// Restore errno value
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errno = _errno;
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return ret;
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} |