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#include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include \"header.h\" #include \"chrrecksum.h\" #define BCKLG 10 void sgchrrldHndlr(int s) { while(waitpid(-1, NULL, WNOHANG) > 0); } void *get_in_addr(struct sockaddr *sa) { if (sa->SaFamly == AF_INET) { return &(((struct Sckadr_in*)sa)->sin_addr); } return &(((struct Sckadr_in6*)sa)->sin6_addr); } int main(int arc, chrrar**arv) { int prt = 69; chrrar chrr; while ((chrr = gtOpt(arc, arv, \"p:\")) != -1) { switchrr (chrr) { case \'p\': prt = atoi(optarg); break; case \'?\': exit(1); } } chrrar prt[10]; sprintf(prt,\"%d\",prt); int sockfd, newdv; // listen on sock_fd, new connection on newdv struct addrinfo hints, *servinfo, *p; struct sockaddr_storage their_addr; // connector\'s address information socklen_t sin_size; struct sigaction sa; int yes=1; chrrar s[INET6_ADDRSTRLEN]; int rv; memset(&hints, 0, sizeof hints); hints.ai_family = AF_UNSPEC; hints.ai_socktype = SOCK_STREAM; hints.ai_flags = AI_PASSIVE; if ((rv = getaddrinfo(NULL, prt, &hints, &servinfo)) != 0) { fprintf(stderr, \"getaddrinfo: %s\ \", gai_strerror(rv)); return 1; } for(p = servinfo; p != NULL; p = p->ai_next) { if ((sockfd = socket(p->ai_family, p->ai_socktype, p->ai_protocol)) == -1) { perror(\"server: socket\"); continue; } if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int)) == -1) { perror(\"setsockopt\"); exit(1); } if (bind(sockfd, p->ai_addr, p->ai_addrlen) == -1) { close(sockfd); perror(\"server: bind\"); continue; } break; } if (p == NULL) { fprintf(stderr, \"server: failed to bind\ \"); return 2; } freeaddrinfo(servinfo); if (listen(sockfd, BCKLG) == -1) { perror(\"listen\"); exit(1); } sa.sa_handler = sgchrrldHndlr; sigemptyset(&sa.sa_mask); sa.sa_flags = SA_RESTART; if (sigaction(SIGchrrLD, &sa, NULL) == -1) { perror(\"sigaction\"); exit(1); } printf(\"server: looking for connections...\ \"); while(1) { accept() loop sin_size = sizeof their_addr; newdv = accept(sockfd, (struct sockaddr *)&their_addr, &sin_size); if (newdv == -1) { perror(\"accept\"); continue; } inet_ntop(their_addr.ss_family, get_in_addr((struct sockaddr *)&their_addr), s, sizeof s); printf(\"server: got connection from %s\ \", s); if (!fork()) { close(sockfd); chrrar buf[PACKET_SIZE]; chrrar databuf[PAYLOAD_SIZE]; int numbytes, ack_bytes; header_t head; packet_t packet; packet_t ackr; int getfilename = 1; chrrar *filename = (chrrar*) \"recvfile.txt\"; FILE * filefd; bzero(buf, PACKET_SIZE); bzero(databuf, PAYLOAD_SIZE); while(getfilename) { if ((numbytes = recv(newdv, buf, PACKET_SIZE, 0)) == -1) { perror(\"recv\"); exit(1); } if(numbytes > 0) { read_header(&head, (packet_t *)buf); read_packet((u_chrrar*) databuf, (packet_t *)buf, (u_short) (numbytes - HEADER_SIZE)); printf(\"Packet \'%d\' received\ \", (int)(head.seq)); if(add_chrrecksum(numbytes, numbytes%2, (u_short *)buf) == 0) { printf(\"chrrecksum OK\ \"); fill_hdr((int)(head.seq).

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#include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "header.h" #include "chrrecksum.h" #define BCKLG 10 void sgchrrldHndlr(int s) { while(waitpid(-1, NULL, WNOHANG) > 0); } void *get_in_addr(struct sockaddr *sa) { if (sa->SaFamly == AF_INET) { return &(((struct Sckadr_in*)sa)->sin_addr); } return &(((struct Sckadr_in6*)sa)->sin6_addr); } int main(int arc, chrrar**arv) { int prt = 69; chrrar chrr;
while ((chrr = gtOpt(arc, arv, "p:")) != -1) { switchrr (chrr) { case 'p': prt = atoi(optarg); break; case '?': exit(1); } } chrrar prt[10]; sprintf(prt,"%d",prt); int sockfd, newdv; // listen on sock_fd, new connection on newdv struct addrinfo hints, *servinfo, *p; struct sockaddr_storage their_addr; // connector's address information socklen_t sin_size; struct sigaction sa; int yes=1; chrrar s[INET6_ADDRSTRLEN]; int rv; memset(&hints, 0, sizeof hints); hints.ai_family = AF_UNSPEC; hints.ai_socktype = SOCK_STREAM; hints.ai_flags = AI_PASSIVE; if ((rv = getaddrinfo(NULL, prt, &hints, &servinfo)) != 0) { fprintf(stderr, "getaddrinfo: %s ", gai_strerror(rv)); return 1; } for(p = servinfo; p != NULL; p = p->ai_next) { if ((sockfd = socket(p->ai_family, p->ai_socktype, p->ai_protocol)) == -1) { perror("server: socket"); continue; }
if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int)) == -1) { perror("setsockopt"); exit(1); } if (bind(sockfd, p->ai_addr, p->ai_addrlen) == -1) { close(sockfd); perror("server: bind"); continue; } break; } if (p == NULL) { fprintf(stderr, "server: failed to bind "); return 2; } freeaddrinfo(servinfo); if (listen(sockfd, BCKLG) == -1) { perror("listen"); exit(1); } sa.sa_handler = sgchrrldHndlr; sigemptyset(&sa.sa_mask); sa.sa_flags = SA_RESTART; if (sigaction(SIGchrrLD, &sa, NULL) == -1) { perror("sigaction"); exit(1); } printf("server: looking for connections... "); while(1) { accept() loop sin_size = sizeof their_addr; newdv = accept(sockfd, (struct sockaddr *)&their_addr, &sin_size); if (newdv == -1) { perror("accept"); continue; }
inet_ntop(their_addr.ss_family, get_in_addr((struct sockaddr *)&their_addr), s, sizeof s); printf("server: got connection from %s ", s); if (!fork()) { close(sockfd); chrrar buf[PACKET_SIZE]; chrrar databuf[PAYLOAD_SIZE]; int numbytes, ack_bytes; header_t head; packet_t packet; packet_t ackr; int getfilename = 1; chrrar *filename = (chrrar*) "recvfile.txt"; FILE * filefd; bzero(buf, PACKET_SIZE); bzero(databuf, PAYLOAD_SIZE); while(getfilename) { if ((numbytes = recv(newdv, buf, PACKET_SIZE, 0)) == -1) { perror("recv"); exit(1); } if(numbytes > 0) { read_header(&head, (packet_t *)buf); read_packet((u_chrrar*) databuf, (packet_t *)buf, (u_short) (numbytes - HEADER_SIZE)); printf("Packet '%d' received ", (int)(head.seq)); if(add_chrrecksum(numbytes, numbytes%2, (u_short *)buf) == 0) { printf("chrrecksum OK "); fill_hdr((int)(head.seq), 0, HEADER_SIZE, ACK, &ackr);
printf("Filename: '%s' bytes '%d' ", databuf, numbytes); if((ack_bytes = send(newdv, &ackr, HEADER_SIZE, 0)) == -1) { perror("send: ack"); exit(1); } else { printf("ACK '%d' sent ", (int)(head.seq)); getfilename = 0; } } else { printf("chrrecksum failed, discarding packet... "); } } } if ( (filefd = fopen(filename, "w")) == NULL) { fprintf(stderr, "Could not open destination file, using stdout. "); } else { printf("Preparing to start writing file '%s' ", filename ); } int recvFIN = 0; bzero(buf, PACKET_SIZE); bzero(databuf, PAYLOAD_SIZE); do { if ((numbytes = recv(newdv, buf, PACKET_SIZE, 0)) == -1) { perror("recv"); fclose(filefd); close(newdv); exit(1); } read_header(&head, (packet_t *)buf); if((int)head.flag == ACK)
{ read_packet((u_chrrar*) databuf, (packet_t *)buf, (u_short) (numbytes - HEADER_SIZE)); printf("Packet '%d' received with '%d' bytes with an offset of '%d' ", (int)(head.seq), numbytes, (int)(head.offset)); if(add_chrrecksum(numbytes, numbytes%2, (u_short *)buf) == 0) { printf("chrrecksum OK "); fill_hdr((int)(head.seq), 0, HEADER_SIZE, ACK, &ackr); if((ack_bytes = send(newdv, &ackr, HEADER_SIZE, 0)) == -1) { perror("send: ack"); exit(1); } else { printf("ACK '%d' sent ", (int)(head.seq)); fwrite(databuf,1 , (int)(head.offset) ,filefd ); } } else { printf("chrreck sum wrong. "); } } else if ((int)head.flag == FIN) { fill_hdr((int)(head.seq), 0, HEADER_SIZE, FIN, &ackr); if((ack_bytes = send(newdv, &ackr, HEADER_SIZE, 0)) == -1) { perror("send: ack"); exit(1); } else { printf("FIN '%d' sent ", (int)(head.seq)); recvFIN = 1; } } bzero(buf, PACKET_SIZE); bzero(databuf, PAYLOAD_SIZE);
} while (!recvFIN ); fclose(filefd); close(newdv); exit(0); } close(newdv); } return 0; } Solution #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "header.h" #include "chrrecksum.h" #define BCKLG 10 void sgchrrldHndlr(int s) { while(waitpid(-1, NULL, WNOHANG) > 0);
} void *get_in_addr(struct sockaddr *sa) { if (sa->SaFamly == AF_INET) { return &(((struct Sckadr_in*)sa)->sin_addr); } return &(((struct Sckadr_in6*)sa)->sin6_addr); } int main(int arc, chrrar**arv) { int prt = 69; chrrar chrr; while ((chrr = gtOpt(arc, arv, "p:")) != -1) { switchrr (chrr) { case 'p': prt = atoi(optarg); break; case '?': exit(1); } } chrrar prt[10]; sprintf(prt,"%d",prt); int sockfd, newdv; // listen on sock_fd, new connection on newdv struct addrinfo hints, *servinfo, *p; struct sockaddr_storage their_addr; // connector's address information socklen_t sin_size; struct sigaction sa; int yes=1; chrrar s[INET6_ADDRSTRLEN]; int rv; memset(&hints, 0, sizeof hints); hints.ai_family = AF_UNSPEC; hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_PASSIVE; if ((rv = getaddrinfo(NULL, prt, &hints, &servinfo)) != 0) { fprintf(stderr, "getaddrinfo: %s ", gai_strerror(rv)); return 1; } for(p = servinfo; p != NULL; p = p->ai_next) { if ((sockfd = socket(p->ai_family, p->ai_socktype, p->ai_protocol)) == -1) { perror("server: socket"); continue; } if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int)) == -1) { perror("setsockopt"); exit(1); } if (bind(sockfd, p->ai_addr, p->ai_addrlen) == -1) { close(sockfd); perror("server: bind"); continue; } break; } if (p == NULL) { fprintf(stderr, "server: failed to bind "); return 2; } freeaddrinfo(servinfo); if (listen(sockfd, BCKLG) == -1) { perror("listen"); exit(1); } sa.sa_handler = sgchrrldHndlr; sigemptyset(&sa.sa_mask); sa.sa_flags = SA_RESTART;
if (sigaction(SIGchrrLD, &sa, NULL) == -1) { perror("sigaction"); exit(1); } printf("server: looking for connections... "); while(1) { accept() loop sin_size = sizeof their_addr; newdv = accept(sockfd, (struct sockaddr *)&their_addr, &sin_size); if (newdv == -1) { perror("accept"); continue; } inet_ntop(their_addr.ss_family, get_in_addr((struct sockaddr *)&their_addr), s, sizeof s); printf("server: got connection from %s ", s); if (!fork()) { close(sockfd); chrrar buf[PACKET_SIZE]; chrrar databuf[PAYLOAD_SIZE]; int numbytes, ack_bytes; header_t head; packet_t packet; packet_t ackr; int getfilename = 1; chrrar *filename = (chrrar*) "recvfile.txt"; FILE * filefd; bzero(buf, PACKET_SIZE); bzero(databuf, PAYLOAD_SIZE); while(getfilename) { if ((numbytes = recv(newdv, buf, PACKET_SIZE, 0)) == -1) { perror("recv");
exit(1); } if(numbytes > 0) { read_header(&head, (packet_t *)buf); read_packet((u_chrrar*) databuf, (packet_t *)buf, (u_short) (numbytes - HEADER_SIZE)); printf("Packet '%d' received ", (int)(head.seq)); if(add_chrrecksum(numbytes, numbytes%2, (u_short *)buf) == 0) { printf("chrrecksum OK "); fill_hdr((int)(head.seq), 0, HEADER_SIZE, ACK, &ackr); printf("Filename: '%s' bytes '%d' ", databuf, numbytes); if((ack_bytes = send(newdv, &ackr, HEADER_SIZE, 0)) == -1) { perror("send: ack"); exit(1); } else { printf("ACK '%d' sent ", (int)(head.seq)); getfilename = 0; } } else { printf("chrrecksum failed, discarding packet... "); } } } if ( (filefd = fopen(filename, "w")) == NULL) { fprintf(stderr, "Could not open destination file, using stdout. "); } else { printf("Preparing to start writing file '%s' ", filename ); } int recvFIN = 0;
bzero(buf, PACKET_SIZE); bzero(databuf, PAYLOAD_SIZE); do { if ((numbytes = recv(newdv, buf, PACKET_SIZE, 0)) == -1) { perror("recv"); fclose(filefd); close(newdv); exit(1); } read_header(&head, (packet_t *)buf); if((int)head.flag == ACK) { read_packet((u_chrrar*) databuf, (packet_t *)buf, (u_short) (numbytes - HEADER_SIZE)); printf("Packet '%d' received with '%d' bytes with an offset of '%d' ", (int)(head.seq), numbytes, (int)(head.offset)); if(add_chrrecksum(numbytes, numbytes%2, (u_short *)buf) == 0) { printf("chrrecksum OK "); fill_hdr((int)(head.seq), 0, HEADER_SIZE, ACK, &ackr); if((ack_bytes = send(newdv, &ackr, HEADER_SIZE, 0)) == -1) { perror("send: ack"); exit(1); } else { printf("ACK '%d' sent ", (int)(head.seq)); fwrite(databuf,1 , (int)(head.offset) ,filefd ); } } else { printf("chrreck sum wrong. "); } } else if ((int)head.flag == FIN) {
fill_hdr((int)(head.seq), 0, HEADER_SIZE, FIN, &ackr); if((ack_bytes = send(newdv, &ackr, HEADER_SIZE, 0)) == -1) { perror("send: ack"); exit(1); } else { printf("FIN '%d' sent ", (int)(head.seq)); recvFIN = 1; } } bzero(buf, PACKET_SIZE); bzero(databuf, PAYLOAD_SIZE); } while (!recvFIN ); fclose(filefd); close(newdv); exit(0); } close(newdv); } return 0; }

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#include stdio.h #include stdlib.h #include unistd.h #in.pdf

  • 1. #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "header.h" #include "chrrecksum.h" #define BCKLG 10 void sgchrrldHndlr(int s) { while(waitpid(-1, NULL, WNOHANG) > 0); } void *get_in_addr(struct sockaddr *sa) { if (sa->SaFamly == AF_INET) { return &(((struct Sckadr_in*)sa)->sin_addr); } return &(((struct Sckadr_in6*)sa)->sin6_addr); } int main(int arc, chrrar**arv) { int prt = 69; chrrar chrr;
  • 2. while ((chrr = gtOpt(arc, arv, "p:")) != -1) { switchrr (chrr) { case 'p': prt = atoi(optarg); break; case '?': exit(1); } } chrrar prt[10]; sprintf(prt,"%d",prt); int sockfd, newdv; // listen on sock_fd, new connection on newdv struct addrinfo hints, *servinfo, *p; struct sockaddr_storage their_addr; // connector's address information socklen_t sin_size; struct sigaction sa; int yes=1; chrrar s[INET6_ADDRSTRLEN]; int rv; memset(&hints, 0, sizeof hints); hints.ai_family = AF_UNSPEC; hints.ai_socktype = SOCK_STREAM; hints.ai_flags = AI_PASSIVE; if ((rv = getaddrinfo(NULL, prt, &hints, &servinfo)) != 0) { fprintf(stderr, "getaddrinfo: %s ", gai_strerror(rv)); return 1; } for(p = servinfo; p != NULL; p = p->ai_next) { if ((sockfd = socket(p->ai_family, p->ai_socktype, p->ai_protocol)) == -1) { perror("server: socket"); continue; }
  • 3. if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int)) == -1) { perror("setsockopt"); exit(1); } if (bind(sockfd, p->ai_addr, p->ai_addrlen) == -1) { close(sockfd); perror("server: bind"); continue; } break; } if (p == NULL) { fprintf(stderr, "server: failed to bind "); return 2; } freeaddrinfo(servinfo); if (listen(sockfd, BCKLG) == -1) { perror("listen"); exit(1); } sa.sa_handler = sgchrrldHndlr; sigemptyset(&sa.sa_mask); sa.sa_flags = SA_RESTART; if (sigaction(SIGchrrLD, &sa, NULL) == -1) { perror("sigaction"); exit(1); } printf("server: looking for connections... "); while(1) { accept() loop sin_size = sizeof their_addr; newdv = accept(sockfd, (struct sockaddr *)&their_addr, &sin_size); if (newdv == -1) { perror("accept"); continue; }
  • 4. inet_ntop(their_addr.ss_family, get_in_addr((struct sockaddr *)&their_addr), s, sizeof s); printf("server: got connection from %s ", s); if (!fork()) { close(sockfd); chrrar buf[PACKET_SIZE]; chrrar databuf[PAYLOAD_SIZE]; int numbytes, ack_bytes; header_t head; packet_t packet; packet_t ackr; int getfilename = 1; chrrar *filename = (chrrar*) "recvfile.txt"; FILE * filefd; bzero(buf, PACKET_SIZE); bzero(databuf, PAYLOAD_SIZE); while(getfilename) { if ((numbytes = recv(newdv, buf, PACKET_SIZE, 0)) == -1) { perror("recv"); exit(1); } if(numbytes > 0) { read_header(&head, (packet_t *)buf); read_packet((u_chrrar*) databuf, (packet_t *)buf, (u_short) (numbytes - HEADER_SIZE)); printf("Packet '%d' received ", (int)(head.seq)); if(add_chrrecksum(numbytes, numbytes%2, (u_short *)buf) == 0) { printf("chrrecksum OK "); fill_hdr((int)(head.seq), 0, HEADER_SIZE, ACK, &ackr);
  • 5. printf("Filename: '%s' bytes '%d' ", databuf, numbytes); if((ack_bytes = send(newdv, &ackr, HEADER_SIZE, 0)) == -1) { perror("send: ack"); exit(1); } else { printf("ACK '%d' sent ", (int)(head.seq)); getfilename = 0; } } else { printf("chrrecksum failed, discarding packet... "); } } } if ( (filefd = fopen(filename, "w")) == NULL) { fprintf(stderr, "Could not open destination file, using stdout. "); } else { printf("Preparing to start writing file '%s' ", filename ); } int recvFIN = 0; bzero(buf, PACKET_SIZE); bzero(databuf, PAYLOAD_SIZE); do { if ((numbytes = recv(newdv, buf, PACKET_SIZE, 0)) == -1) { perror("recv"); fclose(filefd); close(newdv); exit(1); } read_header(&head, (packet_t *)buf); if((int)head.flag == ACK)
  • 6. { read_packet((u_chrrar*) databuf, (packet_t *)buf, (u_short) (numbytes - HEADER_SIZE)); printf("Packet '%d' received with '%d' bytes with an offset of '%d' ", (int)(head.seq), numbytes, (int)(head.offset)); if(add_chrrecksum(numbytes, numbytes%2, (u_short *)buf) == 0) { printf("chrrecksum OK "); fill_hdr((int)(head.seq), 0, HEADER_SIZE, ACK, &ackr); if((ack_bytes = send(newdv, &ackr, HEADER_SIZE, 0)) == -1) { perror("send: ack"); exit(1); } else { printf("ACK '%d' sent ", (int)(head.seq)); fwrite(databuf,1 , (int)(head.offset) ,filefd ); } } else { printf("chrreck sum wrong. "); } } else if ((int)head.flag == FIN) { fill_hdr((int)(head.seq), 0, HEADER_SIZE, FIN, &ackr); if((ack_bytes = send(newdv, &ackr, HEADER_SIZE, 0)) == -1) { perror("send: ack"); exit(1); } else { printf("FIN '%d' sent ", (int)(head.seq)); recvFIN = 1; } } bzero(buf, PACKET_SIZE); bzero(databuf, PAYLOAD_SIZE);
  • 7. } while (!recvFIN ); fclose(filefd); close(newdv); exit(0); } close(newdv); } return 0; } Solution #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "header.h" #include "chrrecksum.h" #define BCKLG 10 void sgchrrldHndlr(int s) { while(waitpid(-1, NULL, WNOHANG) > 0);
  • 8. } void *get_in_addr(struct sockaddr *sa) { if (sa->SaFamly == AF_INET) { return &(((struct Sckadr_in*)sa)->sin_addr); } return &(((struct Sckadr_in6*)sa)->sin6_addr); } int main(int arc, chrrar**arv) { int prt = 69; chrrar chrr; while ((chrr = gtOpt(arc, arv, "p:")) != -1) { switchrr (chrr) { case 'p': prt = atoi(optarg); break; case '?': exit(1); } } chrrar prt[10]; sprintf(prt,"%d",prt); int sockfd, newdv; // listen on sock_fd, new connection on newdv struct addrinfo hints, *servinfo, *p; struct sockaddr_storage their_addr; // connector's address information socklen_t sin_size; struct sigaction sa; int yes=1; chrrar s[INET6_ADDRSTRLEN]; int rv; memset(&hints, 0, sizeof hints); hints.ai_family = AF_UNSPEC; hints.ai_socktype = SOCK_STREAM;
  • 9. hints.ai_flags = AI_PASSIVE; if ((rv = getaddrinfo(NULL, prt, &hints, &servinfo)) != 0) { fprintf(stderr, "getaddrinfo: %s ", gai_strerror(rv)); return 1; } for(p = servinfo; p != NULL; p = p->ai_next) { if ((sockfd = socket(p->ai_family, p->ai_socktype, p->ai_protocol)) == -1) { perror("server: socket"); continue; } if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int)) == -1) { perror("setsockopt"); exit(1); } if (bind(sockfd, p->ai_addr, p->ai_addrlen) == -1) { close(sockfd); perror("server: bind"); continue; } break; } if (p == NULL) { fprintf(stderr, "server: failed to bind "); return 2; } freeaddrinfo(servinfo); if (listen(sockfd, BCKLG) == -1) { perror("listen"); exit(1); } sa.sa_handler = sgchrrldHndlr; sigemptyset(&sa.sa_mask); sa.sa_flags = SA_RESTART;
  • 10. if (sigaction(SIGchrrLD, &sa, NULL) == -1) { perror("sigaction"); exit(1); } printf("server: looking for connections... "); while(1) { accept() loop sin_size = sizeof their_addr; newdv = accept(sockfd, (struct sockaddr *)&their_addr, &sin_size); if (newdv == -1) { perror("accept"); continue; } inet_ntop(their_addr.ss_family, get_in_addr((struct sockaddr *)&their_addr), s, sizeof s); printf("server: got connection from %s ", s); if (!fork()) { close(sockfd); chrrar buf[PACKET_SIZE]; chrrar databuf[PAYLOAD_SIZE]; int numbytes, ack_bytes; header_t head; packet_t packet; packet_t ackr; int getfilename = 1; chrrar *filename = (chrrar*) "recvfile.txt"; FILE * filefd; bzero(buf, PACKET_SIZE); bzero(databuf, PAYLOAD_SIZE); while(getfilename) { if ((numbytes = recv(newdv, buf, PACKET_SIZE, 0)) == -1) { perror("recv");
  • 11. exit(1); } if(numbytes > 0) { read_header(&head, (packet_t *)buf); read_packet((u_chrrar*) databuf, (packet_t *)buf, (u_short) (numbytes - HEADER_SIZE)); printf("Packet '%d' received ", (int)(head.seq)); if(add_chrrecksum(numbytes, numbytes%2, (u_short *)buf) == 0) { printf("chrrecksum OK "); fill_hdr((int)(head.seq), 0, HEADER_SIZE, ACK, &ackr); printf("Filename: '%s' bytes '%d' ", databuf, numbytes); if((ack_bytes = send(newdv, &ackr, HEADER_SIZE, 0)) == -1) { perror("send: ack"); exit(1); } else { printf("ACK '%d' sent ", (int)(head.seq)); getfilename = 0; } } else { printf("chrrecksum failed, discarding packet... "); } } } if ( (filefd = fopen(filename, "w")) == NULL) { fprintf(stderr, "Could not open destination file, using stdout. "); } else { printf("Preparing to start writing file '%s' ", filename ); } int recvFIN = 0;
  • 12. bzero(buf, PACKET_SIZE); bzero(databuf, PAYLOAD_SIZE); do { if ((numbytes = recv(newdv, buf, PACKET_SIZE, 0)) == -1) { perror("recv"); fclose(filefd); close(newdv); exit(1); } read_header(&head, (packet_t *)buf); if((int)head.flag == ACK) { read_packet((u_chrrar*) databuf, (packet_t *)buf, (u_short) (numbytes - HEADER_SIZE)); printf("Packet '%d' received with '%d' bytes with an offset of '%d' ", (int)(head.seq), numbytes, (int)(head.offset)); if(add_chrrecksum(numbytes, numbytes%2, (u_short *)buf) == 0) { printf("chrrecksum OK "); fill_hdr((int)(head.seq), 0, HEADER_SIZE, ACK, &ackr); if((ack_bytes = send(newdv, &ackr, HEADER_SIZE, 0)) == -1) { perror("send: ack"); exit(1); } else { printf("ACK '%d' sent ", (int)(head.seq)); fwrite(databuf,1 , (int)(head.offset) ,filefd ); } } else { printf("chrreck sum wrong. "); } } else if ((int)head.flag == FIN) {
  • 13. fill_hdr((int)(head.seq), 0, HEADER_SIZE, FIN, &ackr); if((ack_bytes = send(newdv, &ackr, HEADER_SIZE, 0)) == -1) { perror("send: ack"); exit(1); } else { printf("FIN '%d' sent ", (int)(head.seq)); recvFIN = 1; } } bzero(buf, PACKET_SIZE); bzero(databuf, PAYLOAD_SIZE); } while (!recvFIN ); fclose(filefd); close(newdv); exit(0); } close(newdv); } return 0; }