3 #include <sys/socket.h>
12 #define TFTP_PKT_SIZE 516
14 static const char *opcode_names[] = {
15 "RRQ", "WRQ", "DATA", "ACK", "ERR"
26 static inline void pkt_mknum(char *pkt, uint16_t n)
28 *(uint16_t*)pkt = htons(n);
31 static inline uint16_t pkt_num(char *pkt)
33 return ntohs(*(uint16_t*)pkt);
36 static void pkt_mkwrq(char *pkt, const char *filename, const char *mode)
42 strcpy(pkt + len, filename);
43 len += strlen(filename) + 1;
44 strcpy(pkt + len, mode);
45 len += strlen(mode) + 1;
48 static inline void pkt_print(char *pkt, FILE *fp)
50 uint16_t opcode = pkt_num(pkt);
51 if (!opcode || opcode > ERR) {
52 fprintf(fp, "(%d)", opcode);
54 fprintf(fp, "%s", opcode_names[opcode - 1]);
55 if (opcode == ACK || opcode == DATA) {
56 fprintf(fp, "(%d)", pkt_num(pkt + 2));
57 } else if (opcode == WRQ) {
58 fprintf(fp, "(%s, %s)", pkt + 2, pkt + 2 + strlen(pkt + 2) + 1);
63 static ssize_t tftp_recvfrom(int sock, char *pkt, struct sockaddr_in *src)
68 (void)src, (void)socklen;
70 len = recvfrom(sock, pkt, TFTP_PKT_SIZE, 0, NULL, NULL);
72 if (errno != EAGAIN) {
80 uint16_t opcode = pkt_num(pkt);
83 fprintf(stderr, "Error (%d): %.511s\n", pkt_num(pkt + 2), pkt + 4);
85 } else if (!opcode || opcode > ERR) {
86 /* The EX2700 I've tested this on sends a raw TFTP packet with no
87 * opcode, and an error message starting at offset 0.
89 fprintf(stderr, "Error: %.32s\n", pkt);
96 static ssize_t tftp_sendto(int sock, char *pkt, size_t len,
97 struct sockaddr_in *dst)
101 switch (pkt_num(pkt)) {
104 len = 2 + strlen(pkt + 2) + 1;
105 len += strlen(pkt + len) + 1;
114 len = 4 + strlen(pkt + 4);
117 fprintf(stderr, "Error: Invalid packet ");
118 pkt_print(pkt, stderr);
122 sent = sendto(sock, pkt, len, 0, (struct sockaddr*)dst, sizeof(*dst));
130 int sock_set_rx_timeout(int fd, unsigned msec)
135 tv.tv_usec = (msec % 1000) * 1000;
136 tv.tv_sec = msec / 1000;
137 if (setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv)) < 0) {
138 perror("setsockopt(SO_RCVTIMEO)");
146 int tftp_put(struct nmrpd_args *args)
148 struct sockaddr_in addr;
151 int fd, sock, err, timeout, last_len;
152 char rx[TFTP_PKT_SIZE], tx[TFTP_PKT_SIZE];
154 fd = open(args->filename, O_RDONLY);
161 sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
168 err = sock_set_rx_timeout(sock, args->rx_timeout);
173 err = !inet_aton(args->ipaddr, &addr.sin_addr);
179 addr.sin_family = AF_INET;
180 addr.sin_port = htons(args->port);
182 pkt_mkwrq(tx, args->filename, "octet");
184 len = tftp_sendto(sock, tx, 0, &addr);
190 len = tftp_recvfrom(sock, rx, &addr);
201 if (timeout || (pkt_num(rx) == ACK && pkt_num(rx + 2) == block)) {
205 pkt_mknum(tx + 2, block);
206 len = read(fd, tx + 4, 512);
212 if (last_len != 512) {
220 err = tftp_sendto(sock, tx, len, &addr);
224 } else if (pkt_num(rx) != ACK) {
225 fprintf(stderr, "Expected ACK(%d), got ", block);
226 pkt_print(rx, stderr);
227 fprintf(stderr, "!\n");
230 err = tftp_recvfrom(sock, rx, &addr);
236 fprintf(stderr, "Timeout while waiting for ACK(%d)\n.", block);