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 = htole16(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[le16toh(code)].err_msg, strlen(errs[le16toh(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: } while (rlen > 0);
169:
170: EVERBOSE(4, "blksize=%u tsize=%llu timeout=%u rollover=%u",
171: cli.siz, cli.tsiz, cli.tout.tv_sec, cli.roll);
172: return 0;
173: }
174:
175: static void *
176: txOack(sched_task_t *task)
177: {
178: rpack_t *pkt = TASK_DATA(task);
179: u_short n = htons(TFTP_OPC_OACK);
180: struct stat sb;
181: char szStr[STRSIZ];
182:
183: ETRACE();
184:
185: RPACK_REWIND(pkt);
186: rpack_uint16(pkt, &n, 0);
187:
188: /* if opcode is RRQ and tsize is 0 then we must return file size to client */
189: if (cli.opc == TFTP_OPC_RRQ && !cli.tsiz && stat(cli.file, &sb) != -1)
190: cli.tsiz = sb.st_size;
191:
192: if (cli.siz > TFTP_LOAD_MAX) {
193: memset(szStr, 0, sizeof szStr);
194: snprintf(szStr, sizeof szStr, "%u", cli.siz);
195: rpack_rdata(pkt, TFTP_OPT_BLKSIZE, strlen(TFTP_OPT_BLKSIZE) + 1);
196: rpack_rdata(pkt, szStr, strlen(szStr) + 1);
197: }
198: if (cli.tsiz) {
199: memset(szStr, 0, sizeof szStr);
200: snprintf(szStr, sizeof szStr, "%llu", cli.tsiz);
201: rpack_rdata(pkt, TFTP_OPT_TSIZE, strlen(TFTP_OPT_TSIZE) + 1);
202: rpack_rdata(pkt, szStr, strlen(szStr) + 1);
203: }
204: if (cli.tout.tv_sec) {
205: memset(szStr, 0, sizeof szStr);
206: snprintf(szStr, sizeof szStr, "%u", cli.tout.tv_sec);
207: rpack_rdata(pkt, TFTP_OPT_TIMEOUT, strlen(TFTP_OPT_TIMEOUT) + 1);
208: rpack_rdata(pkt, szStr, strlen(szStr) + 1);
209: }
210: if (cli.roll) {
211: memset(szStr, 0, sizeof szStr);
212: snprintf(szStr, sizeof szStr, "%u", cli.roll);
213: rpack_rdata(pkt, TFTP_OPT_ROLLOVER, strlen(TFTP_OPT_ROLLOVER) + 1);
214: rpack_rdata(pkt, szStr, strlen(szStr) + 1);
215: }
216:
217: EVERBOSE(4, "blksize=%u tsize=%llu timeout=%u rollover=%u",
218: cli.siz, cli.tsiz, cli.tout.tv_sec, cli.roll);
219: schedEvent(TASK_ROOT(task), txPkt, NULL, TASK_FD(task),
220: TASK_DATA(task), RPACK_OFF(pkt));
221: taskExit(task, NULL);
222: }
223:
224: static void *
225: RQ(sched_task_t *task)
226: {
227: rpack_t *pkt = TASK_DATA(task);
228: struct tftp_hdr *tftp = (struct tftp_hdr*) RPACK_BUF(pkt);
229: int len, rlen = TASK_DATLEN(task) - 2;
230: char *str;
231: u_short code = 0;
232:
233: ETRACE();
234:
235: cli.siz = TFTP_LOAD_MAX;
236: cli.opc = ntohs(rpack_uint16(pkt, NULL, 0));
237: len = str_getString(RPACK_NEXT(pkt), rlen, &str);
238: if (len == -1)
239: goto end;
240: else {
241: strlcpy(cli.file, (char*) RPACK_NEXT(pkt), sizeof cli.file);
242: rlen -= len;
243: rpack_rnext(pkt, len);
244: }
245: len = str_getString((const u_char*) str, rlen, NULL);
246: if (len == -1)
247: goto end;
248: else {
249: rlen -= len;
250: rpack_rnext(pkt, len);
251: if (!strcasecmp(str, TFTP_MODE_ASCII))
252: strlcpy(cli.mode, TFTP_MODE_ASCII, sizeof cli.mode);
253: else if (!strcasecmp(str, TFTP_MODE_OCTET))
254: strlcpy(cli.mode, TFTP_MODE_OCTET, sizeof cli.mode);
255: else if (!strcasecmp(str, TFTP_MODE_MAIL)) {
256: strlcpy(cli.mode, TFTP_MODE_MAIL, sizeof cli.mode);
257: code = htole16(4);
258: goto end;
259: } else {
260: code = htole16(1);
261: goto end;
262: }
263: }
264:
265: switch (cli.opc) {
266: case TFTP_OPC_RRQ:
267: code = O_RDONLY;
268: EVERBOSE(2, "RRQ:: file=%s mode=%s\n", cli.file, cli.mode);
269: break;
270: case TFTP_OPC_WRQ:
271: code = O_WRONLY | O_CREAT;
272: str = (char*) cfg_getAttribute(&cfg, "tftpd", "override");
273: if (!str || tolower(*str) != 'y')
274: code |= O_EXCL;
275: EVERBOSE(2, "WRQ:: file=%s mode=%s\n", cli.file, cli.mode);
276: break;
277: }
278:
279: cli.fd = open(cli.file, code, 0644);
280: if (cli.fd == -1) {
281: if (errno == EACCES)
282: code = htole16(2);
283: else if (errno == ENFILE)
284: code = htole16(3);
285: else if (errno == EEXIST)
286: code = htole16(6);
287: else
288: code = htole16(0);
289: ESYSERR(0);
290: goto end;
291: } else
292: cli.seq = 0;
293:
294: schedEvent(TASK_ROOT(task), execProg, "request", 0, NULL, cli.opc);
295:
296: if (!getOpts(pkt, rlen)) {
297: if (cli.tmp > TFTP_LOAD_MAX) {
298: if (rpack_resize(pkt, cli.tmp + 4))
299: ELIBERR(elwix);
300: else
301: cli.siz = cli.tmp;
302: }
303: if (cli.tout.tv_sec) {
304: schedCancelby(TASK_ROOT(task), taskTIMER, CRITERIA_CALL,
305: timeoutSession, NULL);
306: schedTimer(TASK_ROOT(task), timeoutSession, NULL,
307: cli.tout, TASK_DATA(task), 0);
308: }
309: schedEvent(TASK_ROOT(task), txOack, NULL, TASK_FD(task),
310: TASK_DATA(task), 0);
311: } else if (cli.opc == TFTP_OPC_WRQ) {
312: /* ack */
313: tftp->tftp_opc = htons(TFTP_OPC_ACK);
314: RPACK_REWIND(pkt);
315: rpack_uint16(pkt, NULL, 0);
316: rpack_uint16(pkt, &cli.seq, 0);
317:
318: schedEvent(TASK_ROOT(task), txPkt, NULL, TASK_FD(task),
319: TASK_DATA(task), RPACK_OFF(pkt));
320: } else
321: schedEvent(TASK_ROOT(task), txData, NULL, TASK_FD(task),
322: TASK_DATA(task), 0);
323:
324: cli.seq = 1; /* 1st ack */
325: taskExit(task, NULL);
326: end:
327: tftp->tftp_opc = htons(TFTP_OPC_ERROR);
328: RPACK_REWIND(pkt);
329: rpack_uint16(pkt, NULL, 0);
330: rpack_uint16(pkt, &code, 0);
331: rpack_rdata(pkt, errs[le16toh(code)].err_msg, strlen(errs[le16toh(code)].err_msg) + 1);
332:
333: schedEvent(TASK_ROOT(task), txPkt, (void*) -1, TASK_FD(task),
334: TASK_DATA(task), RPACK_OFF(pkt));
335: taskExit(task, NULL);
336: }
337:
338: static void *
339: ACK(sched_task_t *task)
340: {
341: rpack_t *pkt = TASK_DATA(task);
342: struct tftp_hdr *tftp = (struct tftp_hdr*) RPACK_BUF(pkt);
343: u_short code;
344:
345: ETRACE();
346:
347: RPACK_REWIND(pkt);
348: code = rpack_uint16(pkt, NULL, 0);
349: if (ntohs(code) != TFTP_OPC_ACK) {
350: code = htole16(5);
351: goto end;
352: }
353:
354: code = rpack_uint16(pkt, NULL, 0);
355: if (ntohs(code) > cli.seq || (ntohs(code) < (cli.seq - 1))) {
356: code = htole16(5);
357: goto end;
358: } else if (ntohs(code) == cli.seq) {
359: /* check for rollover seq id */
360: if (cli.roll && cli.seq == USHRT_MAX)
361: cli.seq = cli.roll;
362: else
363: cli.seq++;
364: }
365:
366: EVERBOSE(3, "ACK:: seq=%hu; my new seq=%hu;", ntohs(code), cli.seq);
367:
368: if (!cli.close)
369: schedEvent(TASK_ROOT(task), txData, NULL, TASK_FD(task),
370: TASK_DATA(task), 0);
371: else {
372: schedEvent(TASK_ROOT(task), execProg, "complete", 0, NULL, TFTP_OPC_RRQ);
373: schedCancelby(TASK_ROOT(task), taskTIMER, CRITERIA_CALL, timeoutSession, NULL);
374: schedEvent(TASK_ROOT(task), timeoutSession, NULL, 0, TASK_DATA(task), 0);
375: EVERBOSE(2, "Finish RRQ request");
376: }
377: taskExit(task, NULL);
378: end:
379: tftp->tftp_opc = htons(TFTP_OPC_ERROR);
380: RPACK_REWIND(pkt);
381: rpack_uint16(pkt, NULL, 0);
382: rpack_uint16(pkt, &code, 0);
383: rpack_rdata(pkt, errs[le16toh(code)].err_msg, strlen(errs[le16toh(code)].err_msg) + 1);
384:
385: schedEvent(TASK_ROOT(task), txPkt, (void*) -1, TASK_FD(task),
386: TASK_DATA(task), RPACK_OFF(pkt));
387: taskExit(task, NULL);
388: }
389:
390: static void *
391: DATA(sched_task_t *task)
392: {
393: rpack_t *pkt = TASK_DATA(task);
394: struct tftp_hdr *tftp = (struct tftp_hdr*) RPACK_BUF(pkt);
395: u_short code;
396: int len;
397:
398: ETRACE();
399:
400: RPACK_REWIND(pkt);
401: code = rpack_uint16(pkt, NULL, 0);
402: if (ntohs(code) != TFTP_OPC_DATA) {
403: code = htole16(5);
404: goto end;
405: }
406:
407: code = rpack_uint16(pkt, NULL, 0);
408: if (ntohs(code) < cli.seq || ntohs(code) > cli.seq + 1) {
409: code = htole16(5);
410: goto end;
411: } else
412: cli.seq = ntohs(code);
413:
414: /* max file size check */
415: len = TASK_DATLEN(task) - RPACK_OFF(pkt);
416: if (cli.tsiz && cli.tsiz < cli.seq * cli.siz)
417: len = MIN(len, cli.tsiz - (cli.seq - 1) * cli.siz);
418: if (len < cli.siz)
419: cli.close = 42; /* last received packet, should be close! */
420:
421: EVERBOSE(3, "DATA:: seq=%hu; len=%d", cli.seq, len);
422:
423: len = pwrite(cli.fd, RPACK_NEXT(pkt), len, (cli.seq - 1) * cli.siz);
424: if (len == -1) {
425: ESYSERR(0);
426: code = htole16(3);
427: goto end;
428: } else {
429: rpack_rnext(pkt, len);
430: EVERBOSE(3, "Written to file %s %d bytes", cli.file, len);
431: }
432:
433: schedEvent(TASK_ROOT(task), txAck, NULL, TASK_FD(task), TASK_DATA(task), 0);
434: taskExit(task, NULL);
435: end:
436: tftp->tftp_opc = htons(TFTP_OPC_ERROR);
437: RPACK_REWIND(pkt);
438: rpack_uint16(pkt, NULL, 0);
439: rpack_uint16(pkt, &code, 0);
440: rpack_rdata(pkt, errs[le16toh(code)].err_msg, strlen(errs[le16toh(code)].err_msg) + 1);
441:
442: schedEvent(TASK_ROOT(task), txPkt, (void*) -1, TASK_FD(task),
443: TASK_DATA(task), RPACK_OFF(pkt));
444: taskExit(task, NULL);
445: }
446:
447: void *
448: rxPkt(sched_task_t *task)
449: {
450: sockaddr_t sa;
451: socklen_t salen = sizeof sa;
452: int rlen;
453: rpack_t *pkt = TASK_DATA(task);
454: struct tftp_hdr *tftp = (struct tftp_hdr*) RPACK_BUF(pkt);
455: u_short code;
456:
457: ETRACE();
458:
459: memset(RPACK_BUF(pkt), 0, RPACK_LEN(pkt));
460: rlen = recvfrom(TASK_FD(task), RPACK_BUF(pkt), RPACK_LEN(pkt), 0, &sa.sa, &salen);
461: if (rlen == -1) {
462: ESYSERR(0);
463: goto end;
464: } else if (!cli.addr.sa.sa_len) {
465: cli.addr = sa;
466: RPACK_REWIND(pkt);
467: switch (ntohs(tftp->tftp_opc)) {
468: case TFTP_OPC_RRQ:
469: case TFTP_OPC_WRQ:
470: schedEvent(TASK_ROOT(task), RQ, NULL, TASK_FD(task),
471: TASK_DATA(task), rlen);
472: break;
473: case TFTP_OPC_ERROR:
474: default:
475: RPACK_REWIND(pkt);
476: code = htons(TFTP_OPC_ERROR);
477: rpack_uint16(pkt, &code, 0);
478: code = htole16(4);
479: rpack_uint16(pkt, &code, 0);
480: rpack_rdata(pkt, errs[4].err_msg, strlen(errs[4].err_msg) + 1);
481:
482: schedEvent(TASK_ROOT(task), txPkt, (void*) -1, TASK_FD(task),
483: TASK_DATA(task), RPACK_OFF(pkt));
484: goto end;
485: }
486: } else if (memcmp(&cli.addr, &sa, salen)) {
487: EERROR(LOG_WARNING, "Packet dropped!!!\n"
488: "Get frame from different address for this session");
489: goto end;
490: } else
491: switch (ntohs(tftp->tftp_opc)) {
492: case TFTP_OPC_ACK:
493: schedEvent(TASK_ROOT(task), ACK, NULL, TASK_FD(task),
494: TASK_DATA(task), rlen);
495: break;
496: case TFTP_OPC_DATA:
497: schedEvent(TASK_ROOT(task), DATA, NULL, TASK_FD(task),
498: TASK_DATA(task), rlen);
499: break;
500: case TFTP_OPC_OACK:
501: case TFTP_OPC_ERROR:
502: default:
503: RPACK_REWIND(pkt);
504: code = htons(TFTP_OPC_ERROR);
505: rpack_uint16(pkt, &code, 0);
506: code = htole16(4);
507: rpack_uint16(pkt, &code, 0);
508: rpack_rdata(pkt, errs[4].err_msg, strlen(errs[4].err_msg) + 1);
509:
510: schedEvent(TASK_ROOT(task), txPkt, (void*) -1, TASK_FD(task),
511: TASK_DATA(task), RPACK_OFF(pkt));
512: goto end;
513: }
514:
515: schedCancelby(TASK_ROOT(task), taskTIMER, CRITERIA_CALL, timeoutSession, NULL);
516: schedTimer(TASK_ROOT(task), timeoutSession, NULL,
517: cli.tout.tv_sec ? cli.tout : timeout, TASK_DATA(task), 0);
518: end:
519: schedReadSelf(task);
520: taskExit(task, NULL);
521: }
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