tor_multipath_voip/src/packet.c

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#include "packet.h"
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size_t get_full_size(struct buffer_packet* bp) {
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union abstract_packet* ap = &bp->ip.ap;
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for (int i = 0; i < bp->ap_count; i++) {
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ap = (union abstract_packet*)(&ap->raw + ap->fmt.headers.size);
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}
return &ap->raw - &bp->ip.ap.raw;
}
enum FD_STATE read_packet_from_tcp(int fd, struct buffer_packet* bp) {
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ssize_t nread;
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size_t pkt_size_size = sizeof(bp->ip.ap.fmt.headers.size);
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if (bp->mode != BP_READING) return FDS_ERR;
while (bp->aread < pkt_size_size) {
nread = read(fd, &(bp->ip.ap.raw) + bp->aread, pkt_size_size - bp->aread);
if (nread == 0) return FDS_AGAIN;
if (nread == -1 && errno == EAGAIN) return FDS_AGAIN;
if (nread == -1) return FDS_ERR;
bp->aread += nread;
}
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while (bp->aread < bp->ip.ap.fmt.headers.size) {
nread = read(fd, &(bp->ip.ap.raw) + bp->aread, bp->ip.ap.fmt.headers.size - bp->aread);
if (nread == 0) return FDS_AGAIN;
if (nread == -1 && errno == EAGAIN) return FDS_AGAIN;
if (nread == -1) return FDS_ERR;
bp->aread += nread;
}
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bp->mode = BP_WRITING;
bp->awrite = 0;
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bp->ap_count = 1;
return FDS_READY;
}
enum FD_STATE write_packet_to_tcp(int fd, struct buffer_packet* bp) {
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ssize_t nwrite;
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if (bp->mode != BP_WRITING) return FDS_ERR;
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while (bp->awrite < get_full_size(bp)) {
nwrite = send(fd, &(bp->ip.ap.raw) + bp->awrite, get_full_size(bp) - bp->awrite, 0);
if (nwrite == -1 && errno == EAGAIN) return FDS_AGAIN;
if (nwrite == -1) return FDS_ERR;
bp->awrite += nwrite;
}
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bp->mode = BP_READING;
bp->aread = 0;
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bp->ap_count = 0;
return FDS_READY;
}
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enum FD_STATE write_packet_to_udp(int fd, struct buffer_packet* bp, struct udp_target* udp_t) {
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ssize_t nwrite;
size_t bytes_to_send;
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assert(bp->ip.ap.fmt.headers.cmd == CMD_CLEAR);
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size_t pkt_header_size = sizeof(bp->ip.ap.fmt.headers) + sizeof(bp->ip.ap.fmt.content.clear) - sizeof(char);
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struct sockaddr* addr = NULL;
socklen_t addrlen = 0;
if (udp_t->set) {
addr = (struct sockaddr*) &udp_t->addr;
addrlen = sizeof(struct sockaddr_in);
}
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if (bp->mode != BP_WRITING) return FDS_ERR;
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bytes_to_send = bp->ip.ap.fmt.headers.size - pkt_header_size;
nwrite = sendto(fd,
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&(bp->ip.ap.fmt.content.clear.payload),
bytes_to_send,
0,
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addr,
addrlen);
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if (nwrite == -1 && errno == EAGAIN) return FDS_AGAIN;
if (nwrite != bytes_to_send) return FDS_ERR;
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bp->mode = BP_READING;
bp->aread = 0;
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bp->ap_count = 0;
return FDS_READY;
}
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enum FD_STATE read_packet_from_udp (int fd, struct buffer_packet* bp, struct udp_target* udp_t) {
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ssize_t nread;
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if (bp->mode != BP_READING) {
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fprintf(stderr, "Buffer packet is not in reading mode (mode: %d)\n", bp->mode);
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return FDS_ERR;
}
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size_t pkt_header_size = sizeof(bp->ip.ap.fmt.headers) + sizeof(bp->ip.ap.fmt.content.clear) - sizeof(char); // We remove the payload
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size_t udp_packet_size = sizeof(struct internet_packet) - pkt_header_size;
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socklen_t addrlen = sizeof(struct sockaddr_in);
nread = recvfrom(fd,
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&(bp->ip.ap.fmt.content.clear.payload),
udp_packet_size,
MSG_TRUNC,
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(struct sockaddr*)&udp_t->addr,
&addrlen);
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if ((int)nread > (int)udp_packet_size) {
fprintf(stderr, "Packet has been truncated (%ld instead of %d)\n", nread, (int)udp_packet_size);
return FDS_ERR;
}
if (nread == -1 && errno == EAGAIN) return FDS_AGAIN;
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if (nread == -1 && errno == EAGAIN) return FDS_AGAIN;
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if (nread == -1) {
fprintf(stderr, "A system error occured\n");
return FDS_ERR;
}
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udp_t->set = 1;
udp_t->addrlen = addrlen;
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bp->ip.ap.fmt.headers.size = nread + pkt_header_size;
bp->ip.ap.fmt.headers.cmd = CMD_CLEAR;
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bp->mode = BP_WRITING;
bp->awrite = 0;
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bp->ap_count = 1;
return FDS_READY;
}