1: #include "global.h"
2: #include "exec.h"
3: #include "srv.h"
4:
5:
6: static void *
7: timeoutSession(sched_task_t *task)
8: {
9: rpack_t *pkt = TASK_DATA(task);
10:
11: ETRACE();
12:
13: /* drop session */
14: if (cli.fd > 2)
15: close(cli.fd);
16: rpack_resize(pkt, TFTP_PKT_MAX);
17: memset(&cli, 0, sizeof cli);
18:
19: taskExit(task, NULL);
20: }
21:
22: static void *
23: txPkt(sched_task_t *task)
24: {
25: int wlen;
26: rpack_t *pkt = TASK_DATA(task);
27: struct tftp_hdr *tftp = (struct tftp_hdr*) RPACK_BUF(pkt);
28:
29: ETRACE();
30:
31: wlen = sendto(TASK_FD(task), RPACK_BUF(pkt), TASK_DATLEN(task),
32: 0, &cli.addr.sa, cli.addr.sa.sa_len);
33: if (wlen == -1)
34: ESYSERR(0);
35: else if (wlen != TASK_DATLEN(task)) {
36: EERROR(EIO, "Sended %d bytes != packet %d bytes",
37: wlen, TASK_DATLEN(task));
38: schedEvent(TASK_ROOT(task), execProg, "error", 0, NULL, TFTP_OPC_ERROR);
39: schedCancelby(TASK_ROOT(task), taskTIMER, CRITERIA_CALL,
40: timeoutSession, NULL);
41: schedEvent(TASK_ROOT(task), timeoutSession, NULL, 0, TASK_DATA(task), 0);
42: } else
43: EVERBOSE(2, "Sended %d bytes", wlen);
44: /* on error or argument, drop session */
45: if (TASK_ARG(task) == (void*) -1 || ntohs(tftp->tftp_opc) == TFTP_OPC_ERROR) {
46: schedEvent(TASK_ROOT(task), execProg, "error", 0, NULL, TFTP_OPC_ERROR);
47: schedCancelby(TASK_ROOT(task), taskTIMER, CRITERIA_CALL,
48: timeoutSession, NULL);
49: schedEvent(TASK_ROOT(task), timeoutSession, NULL, 0, TASK_DATA(task), 0);
50: }
51:
52: taskExit(task, NULL);
53: }
54:
55: static void *
56: txData(sched_task_t *task)
57: {
58: rpack_t *pkt = TASK_DATA(task);
59: u_short code = 0, n = htons(TFTP_OPC_DATA);
60: int len;
61:
62: ETRACE();
63:
64: RPACK_REWIND(pkt);
65: rpack_uint16(pkt, &n, 0);
66: n = htons(cli.seq);
67: rpack_uint16(pkt, &n, 0);
68:
69: /* max file size check */
70: if (cli.tsiz && cli.tsiz < cli.seq * cli.siz) {
71: len = cli.tsiz - (cli.seq - 1) * cli.siz;
72: cli.close = 42; /* last sended packet, should be close! */
73: } else
74: len = cli.siz;
75:
76: len = pread(cli.fd, RPACK_NEXT(pkt), len, (cli.seq - 1) * cli.siz);
77: if (len == -1) {
78: ESYSERR(0);
79: code = htons(3);
80: goto end;
81: } else {
82: rpack_rnext(pkt, len);
83: EVERBOSE(3, "Read from file %s %d bytes", cli.file, len);
84: }
85:
86: if (cli.siz - len)
87: cli.close = 42; /* last sended packet, should be close! */
88:
89: schedEvent(TASK_ROOT(task), txPkt, NULL, TASK_FD(task),
90: TASK_DATA(task), RPACK_OFF(pkt));
91: taskExit(task, NULL);
92: end:
93: RPACK_REWIND(pkt);
94: n = htons(TFTP_OPC_ERROR);
95: rpack_uint16(pkt, &n, 0);
96: rpack_uint16(pkt, &code, 0);
97: rpack_rdata(pkt, errs[ntohs(code)].err_msg, strlen(errs[ntohs(code)].err_msg) + 1);
98:
99: schedEvent(TASK_ROOT(task), txPkt, (void*) -1, TASK_FD(task),
100: TASK_DATA(task), RPACK_OFF(pkt));
101: taskExit(task, NULL);
102: }
103:
104: static void *
105: txAck(sched_task_t *task)
106: {
107: rpack_t *pkt = TASK_DATA(task);
108: u_short n = htons(TFTP_OPC_ACK);
109:
110: ETRACE();
111:
112: RPACK_REWIND(pkt);
113: rpack_uint16(pkt, &n, 0);
114: n = htons(cli.seq);
115: rpack_uint16(pkt, &n, 0);
116:
117: schedEvent(TASK_ROOT(task), txPkt, NULL, TASK_FD(task),
118: TASK_DATA(task), RPACK_OFF(pkt));
119:
120: if (cli.close) {
121: schedEvent(TASK_ROOT(task), execProg, "complete", 0, NULL, TFTP_OPC_WRQ);
122: schedCancelby(TASK_ROOT(task), taskTIMER, CRITERIA_CALL, timeoutSession, NULL);
123: schedEvent(TASK_ROOT(task), timeoutSession, NULL, 0, TASK_DATA(task), 0);
124: EVERBOSE(2, "Finish WRQ request");
125: }
126: taskExit(task, NULL);
127: }
128:
129: static int
130: getOpts(rpack_t * __restrict pkt, int rlen)
131: {
132: char *opt, *val;
133: int len;
134:
135: if (!rlen)
136: return -1;
137:
138: do {
139: /* option */
140: len = str_getString(RPACK_NEXT(pkt), RPACK_REMAIN(pkt), NULL);
141: if (len == -1)
142: return -1;
143: else
144: rlen -= len;
145: opt = (char*) rpack_rnext(pkt, len);
146: if (!opt)
147: return -1;
148: EVERBOSE(7, "opt=%s rlen=%d", opt, rlen);
149: /* value */
150: len = str_getString(RPACK_NEXT(pkt), RPACK_REMAIN(pkt), NULL);
151: if (len == -1)
152: return -1;
153: else
154: rlen -= len;
155: val = (char*) rpack_rnext(pkt, len);
156: if (!val)
157: return -1;
158: EVERBOSE(7, "val=%s rlen=%d", val, rlen);
159:
160: if (!strcasecmp(opt, TFTP_OPT_BLKSIZE))
161: cli.tmp = strtol(val, NULL, 10);
162: else if (!strcasecmp(opt, TFTP_OPT_TSIZE))
163: cli.tsiz = strtoll(val, NULL, 10);
164: else if (!strcasecmp(opt, TFTP_OPT_TIMEOUT))
165: cli.tout.tv_sec = strtol(val, NULL, 10);
166: else if (!strcasecmp(opt, TFTP_OPT_ROLLOVER)) {
167: cli.roll = strtol(val, NULL, 10);
168: cli.roll++;
169: }
170: } while (rlen > 0);
171:
172: EVERBOSE(4, "blksize=%u tsize=%llu timeout=%u rollover=%u",
173: cli.siz, cli.tsiz, cli.tout.tv_sec, cli.roll - 1);
174: return 0;
175: }
176:
177: static void *
178: txOack(sched_task_t *task)
179: {
180: rpack_t *pkt = TASK_DATA(task);
181: u_short n = htons(TFTP_OPC_OACK);
182: struct stat sb;
183: char szStr[STRSIZ];
184:
185: ETRACE();
186:
187: RPACK_REWIND(pkt);
188: rpack_uint16(pkt, &n, 0);
189:
190: /* if opcode is RRQ and tsize is 0 then we must return file size to client */
191: if (cli.opc == TFTP_OPC_RRQ && !cli.tsiz && stat(cli.file, &sb) != -1)
192: cli.tsiz = sb.st_size;
193:
194: if (cli.siz > TFTP_LOAD_MAX) {
195: memset(szStr, 0, sizeof szStr);
196: snprintf(szStr, sizeof szStr, "%u", cli.siz);
197: rpack_rdata(pkt, TFTP_OPT_BLKSIZE, strlen(TFTP_OPT_BLKSIZE) + 1);
198: rpack_rdata(pkt, szStr, strlen(szStr) + 1);
199: }
200: if (cli.tsiz) {
201: memset(szStr, 0, sizeof szStr);
202: snprintf(szStr, sizeof szStr, "%llu", cli.tsiz);
203: rpack_rdata(pkt, TFTP_OPT_TSIZE, strlen(TFTP_OPT_TSIZE) + 1);
204: rpack_rdata(pkt, szStr, strlen(szStr) + 1);
205: }
206: if (cli.tout.tv_sec) {
207: memset(szStr, 0, sizeof szStr);
208: snprintf(szStr, sizeof szStr, "%u", cli.tout.tv_sec);
209: rpack_rdata(pkt, TFTP_OPT_TIMEOUT, strlen(TFTP_OPT_TIMEOUT) + 1);
210: rpack_rdata(pkt, szStr, strlen(szStr) + 1);
211: }
212: if (cli.roll) {
213: memset(szStr, 0, sizeof szStr);
214: snprintf(szStr, sizeof szStr, "%u", cli.roll - 1);
215: rpack_rdata(pkt, TFTP_OPT_ROLLOVER, strlen(TFTP_OPT_ROLLOVER) + 1);
216: rpack_rdata(pkt, szStr, strlen(szStr) + 1);
217: }
218:
219: EVERBOSE(4, "blksize=%u tsize=%llu timeout=%u rollover=%u",
220: cli.siz, cli.tsiz, cli.tout.tv_sec, cli.roll - 1);
221: schedCallOnce(TASK_ROOT(task), txPkt, NULL, TASK_FD(task),
222: TASK_DATA(task), RPACK_OFF(pkt));
223: taskExit(task, NULL);
224: }
225:
226: static void *
227: RQ(sched_task_t *task)
228: {
229: rpack_t *pkt = TASK_DATA(task);
230: struct tftp_hdr *tftp = (struct tftp_hdr*) RPACK_BUF(pkt);
231: int len, rlen = TASK_DATLEN(task) - 2;
232: char *str;
233: u_short code = 0;
234:
235: ETRACE();
236:
237: cli.siz = TFTP_LOAD_MAX;
238: cli.opc = ntohs(rpack_uint16(pkt, NULL, 0));
239: len = str_getString(RPACK_NEXT(pkt), rlen, &str);
240: if (len == -1)
241: goto end;
242: else {
243: strlcpy(cli.file, (char*) RPACK_NEXT(pkt), sizeof cli.file);
244: rlen -= len;
245: rpack_rnext(pkt, len);
246: }
247: len = str_getString((const u_char*) str, rlen, NULL);
248: if (len == -1)
249: goto end;
250: else {
251: rlen -= len;
252: rpack_rnext(pkt, len);
253: if (!strcasecmp(str, TFTP_MODE_ASCII))
254: strlcpy(cli.mode, TFTP_MODE_ASCII, sizeof cli.mode);
255: else if (!strcasecmp(str, TFTP_MODE_OCTET))
256: strlcpy(cli.mode, TFTP_MODE_OCTET, sizeof cli.mode);
257: else if (!strcasecmp(str, TFTP_MODE_MAIL)) {
258: strlcpy(cli.mode, TFTP_MODE_MAIL, sizeof cli.mode);
259: code = htons(4);
260: goto end;
261: } else {
262: code = htons(1);
263: goto end;
264: }
265: }
266:
267: switch (cli.opc) {
268: case TFTP_OPC_RRQ:
269: code = O_RDONLY;
270: EVERBOSE(2, "RRQ:: file=%s mode=%s\n", cli.file, cli.mode);
271: break;
272: case TFTP_OPC_WRQ:
273: code = O_WRONLY | O_CREAT;
274: str = (char*) cfg_getAttribute(&cfg, "tftpd", "override");
275: if (!str || tolower(*str) != 'y')
276: code |= O_EXCL;
277: EVERBOSE(2, "WRQ:: file=%s mode=%s\n", cli.file, cli.mode);
278: break;
279: }
280:
281: cli.fd = open(cli.file, code, 0644);
282: if (cli.fd == -1) {
283: if (errno == EACCES)
284: code = htons(2);
285: else if (errno == ENFILE)
286: code = htons(3);
287: else if (errno == EEXIST)
288: code = htons(6);
289: else
290: code = htons(0);
291: ESYSERR(0);
292: goto end;
293: } else
294: cli.seq = 0;
295:
296: schedEvent(TASK_ROOT(task), execProg, "request", 0, NULL, cli.opc);
297:
298: if (!getOpts(pkt, rlen)) {
299: if (cli.tmp > TFTP_LOAD_MAX) {
300: if (rpack_resize(pkt, cli.tmp + 4))
301: ELIBERR(elwix);
302: else
303: cli.siz = cli.tmp;
304: }
305: if (cli.tout.tv_sec) {
306: schedCancelby(TASK_ROOT(task), taskTIMER, CRITERIA_CALL,
307: timeoutSession, NULL);
308: schedTimer(TASK_ROOT(task), timeoutSession, NULL,
309: cli.tout, TASK_DATA(task), 0);
310: }
311: schedEvent(TASK_ROOT(task), txOack, NULL, TASK_FD(task),
312: TASK_DATA(task), 0);
313: } else if (cli.opc == TFTP_OPC_WRQ) {
314: /* ack */
315: tftp->tftp_opc = htons(TFTP_OPC_ACK);
316: RPACK_REWIND(pkt);
317: rpack_uint16(pkt, NULL, 0);
318: rpack_uint16(pkt, &cli.seq, 0);
319:
320: schedEvent(TASK_ROOT(task), txPkt, NULL, TASK_FD(task),
321: TASK_DATA(task), RPACK_OFF(pkt));
322: } else
323: schedEvent(TASK_ROOT(task), txData, NULL, TASK_FD(task),
324: TASK_DATA(task), 0);
325:
326: cli.seq = 1; /* 1st ack */
327: taskExit(task, NULL);
328: end:
329: tftp->tftp_opc = htons(TFTP_OPC_ERROR);
330: RPACK_REWIND(pkt);
331: rpack_uint16(pkt, NULL, 0);
332: rpack_uint16(pkt, &code, 0);
333: rpack_rdata(pkt, errs[ntohs(code)].err_msg, strlen(errs[ntohs(code)].err_msg) + 1);
334:
335: schedEvent(TASK_ROOT(task), txPkt, (void*) -1, TASK_FD(task),
336: TASK_DATA(task), RPACK_OFF(pkt));
337: taskExit(task, NULL);
338: }
339:
340: static void *
341: ACK(sched_task_t *task)
342: {
343: rpack_t *pkt = TASK_DATA(task);
344: struct tftp_hdr *tftp = (struct tftp_hdr*) RPACK_BUF(pkt);
345: u_short code;
346:
347: ETRACE();
348:
349: RPACK_REWIND(pkt);
350: code = rpack_uint16(pkt, NULL, 0);
351: if (ntohs(code) != TFTP_OPC_ACK) {
352: code = htons(5);
353: goto end;
354: }
355:
356: code = rpack_uint16(pkt, NULL, 0);
357: if (ntohs(code) > cli.seq || (ntohs(code) < (cli.seq - 1))) {
358: code = htons(5);
359: goto end;
360: } else if (ntohs(code) == cli.seq) {
361: /* check for rollover seq id */
362: if (cli.roll && cli.seq == USHRT_MAX)
363: cli.seq = cli.roll - 1;
364: else
365: cli.seq++;
366: }
367:
368: EVERBOSE(3, "ACK:: seq=%hu; my new seq=%hu;", ntohs(code), cli.seq);
369:
370: if (!cli.close)
371: schedEvent(TASK_ROOT(task), txData, NULL, TASK_FD(task),
372: TASK_DATA(task), 0);
373: else {
374: schedEvent(TASK_ROOT(task), execProg, "complete", 0, NULL, TFTP_OPC_RRQ);
375: schedCancelby(TASK_ROOT(task), taskTIMER, CRITERIA_CALL, timeoutSession, NULL);
376: schedEvent(TASK_ROOT(task), timeoutSession, NULL, 0, TASK_DATA(task), 0);
377: EVERBOSE(2, "Finish RRQ request");
378: }
379: taskExit(task, NULL);
380: end:
381: tftp->tftp_opc = htons(TFTP_OPC_ERROR);
382: RPACK_REWIND(pkt);
383: rpack_uint16(pkt, NULL, 0);
384: rpack_uint16(pkt, &code, 0);
385: rpack_rdata(pkt, errs[ntohs(code)].err_msg, strlen(errs[ntohs(code)].err_msg) + 1);
386:
387: schedEvent(TASK_ROOT(task), txPkt, (void*) -1, TASK_FD(task),
388: TASK_DATA(task), RPACK_OFF(pkt));
389: taskExit(task, NULL);
390: }
391:
392: static void *
393: DATA(sched_task_t *task)
394: {
395: rpack_t *pkt = TASK_DATA(task);
396: struct tftp_hdr *tftp = (struct tftp_hdr*) RPACK_BUF(pkt);
397: u_short code;
398: int len;
399:
400: ETRACE();
401:
402: RPACK_REWIND(pkt);
403: code = rpack_uint16(pkt, NULL, 0);
404: if (ntohs(code) != TFTP_OPC_DATA) {
405: code = htons(5);
406: goto end;
407: }
408:
409: code = rpack_uint16(pkt, NULL, 0);
410: if (ntohs(code) < cli.seq || ntohs(code) > cli.seq + 1) {
411: code = htons(5);
412: goto end;
413: } else
414: cli.seq = ntohs(code);
415:
416: /* max file size check */
417: len = TASK_DATLEN(task) - RPACK_OFF(pkt);
418: if (cli.tsiz && cli.tsiz < cli.seq * cli.siz)
419: len = MIN(len, cli.tsiz - (cli.seq - 1) * cli.siz);
420: if (len < cli.siz)
421: cli.close = 42; /* last received packet, should be close! */
422:
423: EVERBOSE(3, "DATA:: seq=%hu; len=%d", cli.seq, len);
424:
425: len = pwrite(cli.fd, RPACK_NEXT(pkt), len, (cli.seq - 1) * cli.siz);
426: if (len == -1) {
427: ESYSERR(0);
428: code = htons(3);
429: goto end;
430: } else {
431: rpack_rnext(pkt, len);
432: EVERBOSE(3, "Written to file %s %d bytes", cli.file, len);
433: }
434:
435: schedEvent(TASK_ROOT(task), txAck, NULL, TASK_FD(task), TASK_DATA(task), 0);
436: taskExit(task, NULL);
437: end:
438: tftp->tftp_opc = htons(TFTP_OPC_ERROR);
439: RPACK_REWIND(pkt);
440: rpack_uint16(pkt, NULL, 0);
441: rpack_uint16(pkt, &code, 0);
442: rpack_rdata(pkt, errs[ntohs(code)].err_msg, strlen(errs[ntohs(code)].err_msg) + 1);
443:
444: schedEvent(TASK_ROOT(task), txPkt, (void*) -1, TASK_FD(task),
445: TASK_DATA(task), RPACK_OFF(pkt));
446: taskExit(task, NULL);
447: }
448:
449: void *
450: rxPkt(sched_task_t *task)
451: {
452: sockaddr_t sa;
453: socklen_t salen = sizeof sa;
454: int rlen;
455: rpack_t *pkt = TASK_DATA(task);
456: struct tftp_hdr *tftp = (struct tftp_hdr*) RPACK_BUF(pkt);
457: u_short code;
458:
459: ETRACE();
460:
461: memset(RPACK_BUF(pkt), 0, RPACK_LEN(pkt));
462: rlen = recvfrom(TASK_FD(task), RPACK_BUF(pkt), RPACK_LEN(pkt), 0, &sa.sa, &salen);
463: if (rlen == -1) {
464: ESYSERR(0);
465: goto end;
466: } else if (!cli.addr.sa.sa_len) {
467: cli.addr = sa;
468: RPACK_REWIND(pkt);
469: switch (ntohs(tftp->tftp_opc)) {
470: case TFTP_OPC_RRQ:
471: case TFTP_OPC_WRQ:
472: schedEvent(TASK_ROOT(task), RQ, NULL, TASK_FD(task),
473: TASK_DATA(task), rlen);
474: break;
475: case TFTP_OPC_ERROR:
476: default:
477: RPACK_REWIND(pkt);
478: code = htons(TFTP_OPC_ERROR);
479: rpack_uint16(pkt, &code, 0);
480: code = htons(4);
481: rpack_uint16(pkt, &code, 0);
482: rpack_rdata(pkt, errs[4].err_msg, strlen(errs[4].err_msg) + 1);
483:
484: schedEvent(TASK_ROOT(task), txPkt, (void*) -1, TASK_FD(task),
485: TASK_DATA(task), RPACK_OFF(pkt));
486: goto end;
487: }
488: } else if (memcmp(&cli.addr, &sa, salen)) {
489: EERROR(LOG_WARNING, "Packet dropped!!!\n"
490: "Get frame from different address for this session");
491: goto end;
492: } else
493: switch (ntohs(tftp->tftp_opc)) {
494: case TFTP_OPC_ACK:
495: schedEvent(TASK_ROOT(task), ACK, NULL, TASK_FD(task),
496: TASK_DATA(task), rlen);
497: break;
498: case TFTP_OPC_DATA:
499: schedEvent(TASK_ROOT(task), DATA, NULL, TASK_FD(task),
500: TASK_DATA(task), rlen);
501: break;
502: case TFTP_OPC_OACK:
503: case TFTP_OPC_ERROR:
504: default:
505: RPACK_REWIND(pkt);
506: code = htons(TFTP_OPC_ERROR);
507: rpack_uint16(pkt, &code, 0);
508: code = htons(4);
509: rpack_uint16(pkt, &code, 0);
510: rpack_rdata(pkt, errs[4].err_msg, strlen(errs[4].err_msg) + 1);
511:
512: schedEvent(TASK_ROOT(task), txPkt, (void*) -1, TASK_FD(task),
513: TASK_DATA(task), RPACK_OFF(pkt));
514: goto end;
515: }
516:
517: schedCancelby(TASK_ROOT(task), taskTIMER, CRITERIA_CALL, timeoutSession, NULL);
518: schedTimer(TASK_ROOT(task), timeoutSession, NULL,
519: cli.tout.tv_sec ? cli.tout : timeout, TASK_DATA(task), 0);
520: end:
521: schedReadSelf(task);
522: taskExit(task, NULL);
523: }
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