1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2018 */
6 /* See the file NOTICE for conditions of use and distribution. */
11 static uschar debug_buffer[2048];
12 static uschar *debug_ptr = debug_buffer;
13 static int debug_prefix_length = 0;
17 const uschar * rc_names[] = { /* Mostly for debug output */
22 [FAIL_FORCED] = US"FAIL_FORCED",
23 [DECLINE] = US"DECLINE",
25 [DISCARD] = US"DISCARD",
27 [REROUTED] = US"REROUTED",
30 [UNEXPECTED] = US"UNEXPECTED",
31 [CANCELLED] = US"CANCELLED",
32 [FAIL_SEND] = US"FAIL_SEND",
33 [FAIL_DROP] = US"FAIL_DROP"
37 /*************************************************
39 *************************************************/
41 /* Recursive tree-printing subroutine. It uses a static vector of uschar to
42 hold the line-drawing characters that need to be printed on every line as it
43 moves down the page. This function is used only in debugging circumstances. The
44 output is done via debug_printf(). */
46 #define tree_printlinesize 132 /* line size for printing */
47 static uschar tree_printline[tree_printlinesize];
49 /* Internal recursive subroutine.
53 pos amount of indenting & vertical bars to print
54 barswitch if TRUE print | at the pos value
60 tree_printsub(tree_node *p, int pos, int barswitch)
62 if (p->right) tree_printsub(p->right, pos+2, 1);
63 for (int i = 0; i <= pos-1; i++) debug_printf("%c", tree_printline[i]);
64 debug_printf("-->%s [%d]\n", p->name, p->balance);
65 tree_printline[pos] = barswitch? '|' : ' ';
68 tree_printline[pos+2] = '|';
69 tree_printsub(p->left, pos+2, 0);
73 /* The external function, with just a tree node argument. */
76 debug_print_tree(tree_node *p)
78 for (int i = 0; i < tree_printlinesize; i++) tree_printline[i] = ' ';
79 if (!p) debug_printf("Empty Tree\n"); else tree_printsub(p, 0, 0);
80 debug_printf("---- End of tree ----\n");
85 /*************************************************
86 * Print an argv vector *
87 *************************************************/
89 /* Called when about to obey execv().
91 Argument: the argv vector
96 debug_print_argv(const uschar ** argv)
99 while (*argv) debug_printf(" %.256s", *argv++);
105 /*************************************************
106 * Expand and print debugging string *
107 *************************************************/
109 /* The string is expanded and written as debugging output. If
110 expansion fails, a message is written instead.
117 debug_print_string(uschar *debug_string)
119 if (!debug_string) return;
122 uschar *s = expand_string(debug_string);
124 debug_printf("failed to expand debug_output \"%s\": %s\n", debug_string,
125 expand_string_message);
127 debug_printf("%s%s", s, (s[Ustrlen(s)-1] == '\n')? "" : "\n");
133 /*************************************************
134 * Print current uids and gids *
135 *************************************************/
138 Argument: an introductory string
143 debug_print_ids(uschar *s)
145 debug_printf("%s uid=%ld gid=%ld euid=%ld egid=%ld\n", s,
146 (long int)getuid(), (long int)getgid(), (long int)geteuid(),
147 (long int)getegid());
150 /************************************************/
152 /* Give a string for a return-code */
157 return rc < 0 || rc >= nelem(rc_names) ? US"?" : rc_names[rc];
164 /*************************************************
165 * Print debugging message *
166 *************************************************/
168 /* There are two entries, one for use when being called directly from a
169 function with a variable argument list, one for prepending an indent.
171 If debug_pid is nonzero, print the pid at the start of each line. This is for
172 tidier output when running parallel remote deliveries with debugging turned on.
173 Must do the whole thing with a single printf and flush, as otherwise output may
174 get interleaved. Since some calls to debug_printf() don't end with newline,
175 we save up the text until we do get the newline.
176 Take care to not disturb errno. */
179 /* Debug printf indented by ACL nest depth */
181 debug_printf_indent(const char * format, ...)
184 va_start(ap, format);
185 debug_vprintf(acl_level + expand_level, format, ap);
190 debug_printf(const char *format, ...)
193 va_start(ap, format);
194 debug_vprintf(0, format, ap);
199 debug_vprintf(int indent, const char *format, va_list ap)
201 int save_errno = errno;
203 if (!debug_file) return;
205 /* Various things can be inserted at the start of a line. Don't use the
206 tod_stamp() function for the timestamp, because that will overwrite the
207 timestamp buffer, which may contain something useful. (This was a bug fix: the
208 +memory debugging with +timestamp did cause a problem.) */
210 if (debug_ptr == debug_buffer)
218 gettimeofday(&now, NULL);
220 t = f.timestamps_utc ? gmtime(&tmp) : localtime(&tmp);
221 debug_ptr += sprintf(CS debug_ptr,
222 LOGGING(millisec) ? "%02d:%02d:%02d.%03d " : "%02d:%02d:%02d ",
223 t->tm_hour, t->tm_min, t->tm_sec, (int)(now.tv_usec/1000));
227 debug_ptr += sprintf(CS debug_ptr, "%5d ", (int)getpid());
229 /* Set up prefix if outputting for host checking and not debugging */
231 if (host_checking && debug_selector == 0)
233 Ustrcpy(debug_ptr, US">>> ");
237 debug_prefix_length = debug_ptr - debug_buffer;
242 for (int i = indent >> 2; i > 0; i--)
245 Ustrcpy(debug_ptr, US" !");
246 debug_ptr += 4; /* 3 spaces + shriek */
247 debug_prefix_length += 4;
251 Ustrcpy(debug_ptr, US" " UTF8_VERT_2DASH);
252 debug_ptr += 6; /* 3 spaces + 3 UTF-8 octets */
253 debug_prefix_length += 6;
256 Ustrncpy(debug_ptr, US" ", indent &= 3);
258 debug_prefix_length += indent;
261 /* Use the lengthchecked formatting routine to ensure that the buffer
262 does not overflow. Ensure there's space for a newline at the end.
263 However, use taint-unchecked routines for writing into the buffer
264 so that we can write tainted info into the static debug_buffer -
265 we trust that we will never expand the results. */
268 gstring gs = { .size = (int)sizeof(debug_buffer) - 1,
269 .ptr = debug_ptr - debug_buffer,
271 if (!string_vformat(&gs, SVFMT_TAINT_NOCHK, format, ap))
273 uschar * s = US"**** debug string too long - truncated ****\n";
274 uschar * p = gs.s + gs.ptr;
275 int maxlen = gs.size - Ustrlen(s) - 2;
276 if (p > gs.s + maxlen) p = gs.s + maxlen;
277 if (p > gs.s && p[-1] != '\n') *p++ = '\n';
279 while(*debug_ptr) debug_ptr++;
283 string_from_gstring(&gs);
284 debug_ptr = gs.s + gs.ptr;
288 /* Output the line if it is complete. If we added any prefix data and there
289 are internal newlines, make sure the prefix is on the continuation lines,
290 as long as there is room in the buffer. We want to do just a single fprintf()
291 so as to avoid interleaving. */
293 if (debug_ptr[-1] == '\n')
295 if (debug_prefix_length > 0)
297 uschar *p = debug_buffer;
298 int left = sizeof(debug_buffer) - (debug_ptr - debug_buffer) - 1;
299 while ((p = Ustrchr(p, '\n') + 1) != debug_ptr &&
300 left >= debug_prefix_length)
302 int len = debug_ptr - p;
303 memmove(p + debug_prefix_length, p, len + 1);
304 memmove(p, debug_buffer, debug_prefix_length);
305 debug_ptr += debug_prefix_length;
306 left -= debug_prefix_length;
310 fprintf(debug_file, "%s", CS debug_buffer);
312 debug_ptr = debug_buffer;
313 debug_prefix_length = 0;
320 /* Output the details of a socket */
323 debug_print_socket(int fd)
326 if (fstat(fd, &s) == 0 && (s.st_mode & S_IFMT) == S_IFSOCK)
330 socklen_t vlen = sizeof(val);
332 socklen_t alen = sizeof(a);
333 struct sockaddr_in * sinp = (struct sockaddr_in *)&a;
334 struct sockaddr_in6 * sin6p = (struct sockaddr_in6 *)&a;
335 struct sockaddr_un * sa_unp = (struct sockaddr_un *)&a;
337 if (getsockname(fd, &a, &alen) == 0)
338 switch (sinp->sin_family)
341 g = string_cat(g, US" domain AF_INET");
342 g = string_fmt_append(g, " lcl [%s]:%u",
343 inet_ntoa(sinp->sin_addr), ntohs(sinp->sin_port));
344 if (getpeername(fd, &a, &alen) == 0)
345 g = string_fmt_append(g, " rmt [%s]:%u",
346 inet_ntoa(sinp->sin_addr), ntohs(sinp->sin_port));
351 g = string_cat(g, US" domain AF_INET6");
352 g = string_fmt_append(g, " lcl [%s]:%u",
353 inet_ntop(AF_INET6, &sin6p->sin6_addr, CS buf, sizeof(buf)),
354 ntohs(sin6p->sin6_port));
355 if (getpeername(fd, &a, &alen) == 0)
356 g = string_fmt_append(g, " rmt [%s]:%u",
357 inet_ntop(AF_INET6, &sin6p->sin6_addr, CS buf, sizeof(buf)),
358 ntohs(sin6p->sin6_port));
362 g = string_cat(g, US" domain AF_UNIX");
363 g = string_fmt_append(g, " lcl %s%s",
364 sa_unp->sun_path[0] ? US"" : US"@",
365 sa_unp->sun_path[0] ? sa_unp->sun_path : sa_unp->sun_path+1);
366 if (getpeername(fd, &a, &alen) == 0)
367 g = string_fmt_append(g, " rmt %s%s",
368 sa_unp->sun_path[0] ? US"" : US"@",
369 sa_unp->sun_path[0] ? sa_unp->sun_path : sa_unp->sun_path+1);
372 g = string_fmt_append(g, " domain %u", sinp->sin_family);
375 if (getsockopt(fd, SOL_SOCKET, SO_TYPE, &val, &vlen) == 0)
378 case SOCK_STREAM: g = string_cat(g, US" type SOCK_STREAM"); break;
379 case SOCK_DGRAM: g = string_cat(g, US" type SOCK_DGRAM"); break;
380 default: g = string_fmt_append(g, " type %d", val); break;
383 if (getsockopt(fd, SOL_SOCKET, SO_PROTOCOL, &val, &vlen) == 0)
385 struct protoent * p = getprotobynumber(val);
387 ? string_fmt_append(g, " proto %s\n", p->p_name)
388 : string_fmt_append(g, " proto %d", val);
391 debug_printf_indent(" socket: %s\n", string_from_gstring(g));
394 debug_printf_indent(" fd st_mode 0%o\n", s.st_mode);