1: #include "global.h"
2:
3:
4: static void *
5: timeoutSession(sched_task_t *task)
6: {
7: ETRACE();
8:
9: /* drop session */
10: if (cli.fd > 2)
11: close(cli.fd);
12: memset(&cli, 0, sizeof cli);
13:
14: taskExit(task, NULL);
15: }
16:
17: static void *
18: txPkt(sched_task_t *task)
19: {
20: int wlen;
21: rpack_t *pkt = TASK_DATA(task);
22: struct tftp_hdr *tftp = (struct tftp_hdr*) RPACK_BUF(pkt);
23:
24: ETRACE();
25:
26: wlen = sendto(TASK_FD(task), RPACK_BUF(pkt), TASK_DATLEN(task),
27: 0, &cli.addr.sa, cli.addr.sa.sa_len);
28: if (wlen == -1)
29: ESYSERR(0);
30: else if (wlen != TASK_DATLEN(task)) {
31: EERROR(EIO, "Sended %d bytes != packet %d bytes",
32: wlen, TASK_DATLEN(task));
33: schedCancelby(TASK_ROOT(task), taskTIMER, CRITERIA_CALL,
34: timeoutSession, NULL);
35: memset(&cli, 0, sizeof(sockaddr_t));
36: } else
37: EVERBOSE(2, "Sended %d bytes", wlen);
38: /* on error or argument, drop session */
39: if (TASK_ARG(task) == (void*) -1 || ntohs(tftp->tftp_opc) == TFTP_OPC_ERROR) {
40: schedCancelby(TASK_ROOT(task), taskTIMER, CRITERIA_CALL,
41: timeoutSession, NULL);
42: memset(&cli, 0, sizeof cli);
43: }
44:
45: taskExit(task, NULL);
46: }
47:
48: static void *
49: txData(sched_task_t *task)
50: {
51: rpack_t *pkt = TASK_DATA(task);
52: u_short code = 0, n = htons(TFTP_OPC_DATA);
53: int len;
54:
55: ETRACE();
56:
57: RPACK_REWIND(pkt);
58: rpack_uint16(pkt, &n, 0);
59: n = htons(cli.seq);
60: rpack_uint16(pkt, &n, 0);
61:
62: len = pread(cli.fd, RPACK_NEXT(pkt), cli.siz, (cli.seq - 1) * cli.siz);
63: if (len == -1) {
64: ESYSERR(0);
65: code = htole16(3);
66: goto end;
67: } else {
68: rpack_rnext(pkt, len);
69: EVERBOSE(3, "Read from file %s %d bytes", cli.file, len);
70: }
71:
72: if (cli.siz - len)
73: cli.close = 42; /* last sended packet, should be close! */
74:
75: schedEvent(TASK_ROOT(task), txPkt, NULL, TASK_FD(task),
76: TASK_DATA(task), RPACK_OFF(pkt));
77: taskExit(task, NULL);
78: end:
79: RPACK_REWIND(pkt);
80: n = htons(TFTP_OPC_ERROR);
81: rpack_uint16(pkt, &n, 0);
82: rpack_uint16(pkt, &code, 0);
83: rpack_rdata(pkt, errs[le16toh(code)].err_msg, strlen(errs[le16toh(code)].err_msg) + 1);
84:
85: schedEvent(TASK_ROOT(task), txPkt, (void*) -1, TASK_FD(task),
86: TASK_DATA(task), RPACK_OFF(pkt));
87: taskExit(task, NULL);
88: }
89:
90: static void *
91: txAck(sched_task_t *task)
92: {
93: rpack_t *pkt = TASK_DATA(task);
94: u_short n = htons(TFTP_OPC_ACK);
95:
96: ETRACE();
97:
98: RPACK_REWIND(pkt);
99: rpack_uint16(pkt, &n, 0);
100: n = htons(cli.seq);
101: rpack_uint16(pkt, &n, 0);
102:
103: schedEvent(TASK_ROOT(task), txPkt, NULL, TASK_FD(task),
104: TASK_DATA(task), RPACK_OFF(pkt));
105:
106: if (cli.close) {
107: schedCancelby(TASK_ROOT(task), taskTIMER, CRITERIA_CALL, timeoutSession, NULL);
108: schedEvent(TASK_ROOT(task), timeoutSession, NULL, 0, NULL, 0);
109: EVERBOSE(2, "Finish WRQ request");
110: }
111: taskExit(task, NULL);
112: }
113:
114: static void *
115: RQ(sched_task_t *task)
116: {
117: rpack_t *pkt = TASK_DATA(task);
118: struct tftp_hdr *tftp = (struct tftp_hdr*) RPACK_BUF(pkt);
119: int len, rlen = TASK_DATLEN(task) - 2;
120: char *str;
121: u_short code = 0;
122:
123: ETRACE();
124:
125: cli.siz = TFTP_LOAD_MAX;
126: len = str_getString(tftp->tftp_data, rlen, &str);
127: if (len == -1)
128: goto end;
129: else {
130: rlen -= len;
131: strlcpy(cli.file, (char*) tftp->tftp_data, sizeof cli.file);
132: }
133: len = str_getString((const u_char*) str, rlen, NULL);
134: if (len == -1)
135: goto end;
136: else {
137: rlen -= len;
138: if (!strcasecmp(str, TFTP_MODE_ASCII))
139: strlcpy(cli.mode, TFTP_MODE_ASCII, sizeof cli.mode);
140: else if (!strcasecmp(str, TFTP_MODE_OCTET))
141: strlcpy(cli.mode, TFTP_MODE_OCTET, sizeof cli.mode);
142: else if (!strcasecmp(str, TFTP_MODE_MAIL)) {
143: strlcpy(cli.mode, TFTP_MODE_MAIL, sizeof cli.mode);
144: code = htole16(4);
145: goto end;
146: } else {
147: code = htole16(1);
148: goto end;
149: }
150: }
151:
152: cli.opc = ntohs(tftp->tftp_opc);
153: switch (cli.opc) {
154: case TFTP_OPC_RRQ:
155: code = O_RDONLY;
156: EVERBOSE(2, "RRQ:: file=%s mode=%s\n", cli.file, cli.mode);
157: break;
158: case TFTP_OPC_WRQ:
159: code = O_WRONLY | O_CREAT;
160: str = (char*) cfg_getAttribute(&cfg, "tftpd", "override");
161: if (!str || tolower(*str) != 'y')
162: code |= O_EXCL;
163: EVERBOSE(2, "WRQ:: file=%s mode=%s\n", cli.file, cli.mode);
164: break;
165: }
166: cli.fd = open(cli.file, code, 0644);
167: if (cli.fd == -1) {
168: if (errno == EACCES)
169: code = htole16(2);
170: else if (errno == ENFILE)
171: code = htole16(3);
172: else if (errno == EEXIST)
173: code = htole16(6);
174: else
175: code = htole16(0);
176: ESYSERR(0);
177: goto end;
178: } else
179: cli.seq = 0;
180:
181: if (cli.opc == TFTP_OPC_WRQ) {
182: /* ack */
183: tftp->tftp_opc = htons(TFTP_OPC_ACK);
184: RPACK_REWIND(pkt);
185: rpack_uint16(pkt, NULL, 0);
186: rpack_uint16(pkt, &cli.seq, 0);
187:
188: schedEvent(TASK_ROOT(task), txPkt, NULL, TASK_FD(task),
189: TASK_DATA(task), RPACK_OFF(pkt));
190: } else
191: schedEvent(TASK_ROOT(task), txData, NULL, TASK_FD(task),
192: TASK_DATA(task), 0);
193:
194: cli.seq = 1; /* 1st ack */
195: taskExit(task, NULL);
196: end:
197: tftp->tftp_opc = htons(TFTP_OPC_ERROR);
198: RPACK_REWIND(pkt);
199: rpack_uint16(pkt, NULL, 0);
200: rpack_uint16(pkt, &code, 0);
201: rpack_rdata(pkt, errs[le16toh(code)].err_msg, strlen(errs[le16toh(code)].err_msg) + 1);
202:
203: schedEvent(TASK_ROOT(task), txPkt, (void*) -1, TASK_FD(task),
204: TASK_DATA(task), RPACK_OFF(pkt));
205: taskExit(task, NULL);
206: }
207:
208: static void *
209: ACK(sched_task_t *task)
210: {
211: rpack_t *pkt = TASK_DATA(task);
212: struct tftp_hdr *tftp = (struct tftp_hdr*) RPACK_BUF(pkt);
213: u_short code;
214:
215: ETRACE();
216:
217: RPACK_REWIND(pkt);
218: code = rpack_uint16(pkt, NULL, 0);
219: if (ntohs(code) != TFTP_OPC_ACK) {
220: code = htole16(5);
221: goto end;
222: }
223:
224: code = rpack_uint16(pkt, NULL, 0);
225: if (ntohs(code) > cli.seq || (ntohs(code) < (cli.seq - 1))) {
226: code = htole16(5);
227: goto end;
228: } else if (ntohs(code) == cli.seq)
229: cli.seq++;
230:
231: EVERBOSE(3, "ACK:: seq=%hu; my new seq=%hu;", ntohs(code), cli.seq);
232:
233: if (!cli.close)
234: schedEvent(TASK_ROOT(task), txData, NULL, TASK_FD(task),
235: TASK_DATA(task), 0);
236: else {
237: schedCancelby(TASK_ROOT(task), taskTIMER, CRITERIA_CALL, timeoutSession, NULL);
238: schedEvent(TASK_ROOT(task), timeoutSession, NULL, 0, NULL, 0);
239: EVERBOSE(2, "Finish RRQ request");
240: }
241: taskExit(task, NULL);
242: end:
243: tftp->tftp_opc = htons(TFTP_OPC_ERROR);
244: RPACK_REWIND(pkt);
245: rpack_uint16(pkt, NULL, 0);
246: rpack_uint16(pkt, &code, 0);
247: rpack_rdata(pkt, errs[le16toh(code)].err_msg, strlen(errs[le16toh(code)].err_msg) + 1);
248:
249: schedEvent(TASK_ROOT(task), txPkt, (void*) -1, TASK_FD(task),
250: TASK_DATA(task), RPACK_OFF(pkt));
251: taskExit(task, NULL);
252: }
253:
254: static void *
255: DATA(sched_task_t *task)
256: {
257: rpack_t *pkt = TASK_DATA(task);
258: struct tftp_hdr *tftp = (struct tftp_hdr*) RPACK_BUF(pkt);
259: u_short code;
260: int len;
261:
262: ETRACE();
263:
264: RPACK_REWIND(pkt);
265: code = rpack_uint16(pkt, NULL, 0);
266: if (ntohs(code) != TFTP_OPC_DATA) {
267: code = htole16(5);
268: goto end;
269: }
270:
271: code = rpack_uint16(pkt, NULL, 0);
272: if (ntohs(code) < cli.seq || ntohs(code) > cli.seq + 1) {
273: code = htole16(5);
274: goto end;
275: } else
276: cli.seq = ntohs(code);
277:
278: len = TASK_DATLEN(task) - RPACK_OFF(pkt);
279: if (len < cli.siz)
280: cli.close = 42; /* last received packet, should be close! */
281:
282: EVERBOSE(3, "DATA:: seq=%hu; len=%d", cli.seq, len);
283:
284: len = pwrite(cli.fd, RPACK_NEXT(pkt), len, (cli.seq - 1) * cli.siz);
285: if (len == -1) {
286: ESYSERR(0);
287: code = htole16(3);
288: goto end;
289: } else {
290: rpack_rnext(pkt, len);
291: EVERBOSE(3, "Written to file %s %d bytes", cli.file, len);
292: }
293:
294: schedEvent(TASK_ROOT(task), txAck, NULL, TASK_FD(task), TASK_DATA(task), 0);
295: taskExit(task, NULL);
296: end:
297: tftp->tftp_opc = htons(TFTP_OPC_ERROR);
298: RPACK_REWIND(pkt);
299: rpack_uint16(pkt, NULL, 0);
300: rpack_uint16(pkt, &code, 0);
301: rpack_rdata(pkt, errs[le16toh(code)].err_msg, strlen(errs[le16toh(code)].err_msg) + 1);
302:
303: schedEvent(TASK_ROOT(task), txPkt, (void*) -1, TASK_FD(task),
304: TASK_DATA(task), RPACK_OFF(pkt));
305: taskExit(task, NULL);
306: }
307:
308: void *
309: rxPkt(sched_task_t *task)
310: {
311: sockaddr_t sa;
312: socklen_t salen = sizeof sa;
313: int rlen;
314: rpack_t *pkt = TASK_DATA(task);
315: struct tftp_hdr *tftp = (struct tftp_hdr*) RPACK_BUF(pkt);
316: u_short code;
317:
318: ETRACE();
319:
320: memset(RPACK_BUF(pkt), 0, RPACK_LEN(pkt));
321: rlen = recvfrom(TASK_FD(task), RPACK_BUF(pkt), RPACK_LEN(pkt), 0, &sa.sa, &salen);
322: if (rlen == -1) {
323: ESYSERR(0);
324: goto end;
325: } else if (!cli.addr.sa.sa_len) {
326: cli.addr = sa;
327: switch (ntohs(tftp->tftp_opc)) {
328: case TFTP_OPC_RRQ:
329: case TFTP_OPC_WRQ:
330: schedEvent(TASK_ROOT(task), RQ, NULL, TASK_FD(task),
331: TASK_DATA(task), rlen);
332: break;
333: case TFTP_OPC_ERROR:
334: default:
335: RPACK_REWIND(pkt);
336: code = htons(TFTP_OPC_ERROR);
337: rpack_uint16(pkt, &code, 0);
338: code = htole16(4);
339: rpack_uint16(pkt, &code, 0);
340: rpack_rdata(pkt, errs[4].err_msg, strlen(errs[4].err_msg) + 1);
341:
342: schedEvent(TASK_ROOT(task), txPkt, (void*) -1, TASK_FD(task),
343: TASK_DATA(task), RPACK_OFF(pkt));
344: goto end;
345: }
346: } else if (memcmp(&cli.addr, &sa, salen)) {
347: EERROR(LOG_WARNING, "Packet dropped!!!\n"
348: "Get frame from different address for this session");
349: goto end;
350: } else
351: switch (ntohs(tftp->tftp_opc)) {
352: case TFTP_OPC_ACK:
353: schedEvent(TASK_ROOT(task), ACK, NULL, TASK_FD(task),
354: TASK_DATA(task), rlen);
355: break;
356: case TFTP_OPC_DATA:
357: schedEvent(TASK_ROOT(task), DATA, NULL, TASK_FD(task),
358: TASK_DATA(task), rlen);
359: break;
360: case TFTP_OPC_OACK:
361: ELOGGER(LOG_WARNING, "oack");
362: /*
363: schedEvent(TASK_ROOT(task), OACK, NULL, TASK_FD(task),
364: TASK_DATA(task), rlen);
365: */
366: break;
367: case TFTP_OPC_ERROR:
368: default:
369: RPACK_REWIND(pkt);
370: code = htons(TFTP_OPC_ERROR);
371: rpack_uint16(pkt, &code, 0);
372: code = htole16(4);
373: rpack_uint16(pkt, &code, 0);
374: rpack_rdata(pkt, errs[4].err_msg, strlen(errs[4].err_msg) + 1);
375:
376: schedEvent(TASK_ROOT(task), txPkt, (void*) -1, TASK_FD(task),
377: TASK_DATA(task), RPACK_OFF(pkt));
378: goto end;
379: }
380:
381: schedCancelby(TASK_ROOT(task), taskTIMER, CRITERIA_CALL, timeoutSession, NULL);
382: schedTimer(TASK_ROOT(task), timeoutSession, NULL, timeout, NULL, 0);
383: end:
384: schedReadSelf(task);
385: taskExit(task, NULL);
386: }
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