3 #include <sys/socket.h>
11 #define TFTP_PKT_SIZE 516
13 static const char *opcode_names[] = {
14 "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)
69 len = recvfrom(sock, pkt, TFTP_PKT_SIZE, 0, NULL, NULL);
71 if (errno != EAGAIN) {
79 uint16_t opcode = pkt_num(pkt);
82 fprintf(stderr, "Error (%d): %.511s\n", pkt_num(pkt + 2), pkt + 4);
84 } else if (!opcode || opcode > ERR) {
85 /* The EX2700 I've tested this on sends a raw TFTP packet with no
86 * opcode, and an error message starting at offset 0.
88 fprintf(stderr, "Error: %.32s\n", pkt);
95 static ssize_t tftp_sendto(int sock, char *pkt, size_t len,
96 struct sockaddr_in *dst)
100 switch (pkt_num(pkt)) {
103 len = 2 + strlen(pkt + 2) + 1;
104 len += strlen(pkt + len) + 1;
113 len = 4 + strlen(pkt + 4);
116 fprintf(stderr, "Error: Invalid packet ");
117 pkt_print(pkt, stderr);
121 sent = sendto(sock, pkt, len, 0, (struct sockaddr*)dst, sizeof(*dst));
129 int sock_set_rx_timeout(int fd, unsigned msec)
134 tv.tv_usec = (msec % 1000) * 1000;
135 tv.tv_sec = msec / 1000;
136 if (setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv)) < 0) {
137 perror("setsockopt(SO_RCVTIMEO)");
145 int tftp_put(const char *filename, const char *ipaddr, uint16_t port)
147 struct sockaddr_in dst, src;
148 enum tftp_opcode opcode;
152 int fd, sock, err, done, i, last_len;
153 char pkt[TFTP_PKT_SIZE];
155 fd = open(filename, O_RDONLY);
162 sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
169 err = sock_set_rx_timeout(sock, 999);
174 err = !inet_aton(ipaddr, &dst.sin_addr);
180 dst.sin_family = AF_INET;
181 dst.sin_port = htons(port);
183 pkt_mkwrq(pkt, filename, "octet");
185 len = tftp_sendto(sock, pkt, 0, &dst);
191 len = tftp_recvfrom(sock, pkt, &dst);
197 //dst.sin_port = src.sin_port;
204 if (pkt_num(pkt) == ACK && pkt_num(pkt + 2) == block) {
206 pkt_mknum(pkt, DATA);
207 pkt_mknum(pkt + 2, block);
208 len = read(fd, pkt + 4, 512);
214 done = last_len != 512;
219 len = tftp_sendto(sock, pkt, len, &dst);
225 fprintf(stderr, "Expected ACK(%d), got ", block);
226 pkt_print(pkt, stderr);
227 fprintf(stderr, "!\n");
232 len = tftp_recvfrom(sock, pkt, &dst);
235 fprintf(stderr, "Timeout while waiting for ACK(%d).\n", block);