git.maemo.org Git - monky/blob - src/mboxscan.c

   1 /* Conky, a system monitor, based on torsmo
   2  *
   3  * Any original torsmo code is licensed under the BSD license
   4  *
   5  * All code written since the fork of torsmo is licensed under the GPL
   6  *
   7  * Please see COPYING for details
   8  *
   9  * Copyright (c) 2006 Marco Candrian <mac@calmar.ws>
  10  * Copyright (c) 2005-2009 Brenden Matthews, Philip Kovacs, et. al.
  11  *      (see AUTHORS)
  12  * All rights reserved.
  13  *
  14  * This program is free software: you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation, either version 3 of the License, or
  17  * (at your option) any later version.
  18  *
  19  * This program is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  25  *
  26  * vim: ts=4 sw=4 noet ai cindent syntax=c
  27  *
  28  */
  29
  30 #include "conky.h"
  31 #include "logging.h"
  32 #include "mail.h"
  33 #include <sys/stat.h>
  34 #include <sys/time.h>
  35 #include <errno.h>
  36 #include "mboxscan.h"
  37
  38 #define FROM_WIDTH 10
  39 #define SUBJECT_WIDTH 22
  40 #define PRINT_MAILS 5
  41 #define TIME_DELAY 5
  42
  43 struct ring_list {
  44         char *from;
  45         char *subject;
  46         struct ring_list *previous;
  47         struct ring_list *next;
  48 };
  49
  50 static time_t last_ctime;       /* needed for mutt at least */
  51 static time_t last_mtime;       /* not sure what to test: testing both now */
  52 static double last_update;
  53
  54 static int args_ok = 0;
  55 static int from_width;
  56 static int subject_width;
  57 static int print_mails;
  58 static int time_delay;
  59
  60 static char mbox_mail_spool[DEFAULT_TEXT_BUFFER_SIZE];
  61
  62 void mbox_scan(char *args, char *output, size_t max_len)
  63 {
  64         int i, u, flag;
  65         int force_rescan = 0;
  66         char buf[text_buffer_size];
  67         struct stat statbuf;
  68         struct ring_list *curr = 0, *prev = 0, *startlist = 0;
  69         FILE *fp;
  70
  71         /* output was set to 1 after malloc'ing in conky.c */
  72         /* -> beeing able to test it here for catching SIGUSR1 */
  73         if (output[0] == 1) {
  74                 force_rescan = 1;
  75                 output[0] = '\0';
  76         }
  77
  78         if (!args_ok || force_rescan) {
  79
  80                 char *substr = strstr(args, "-n");
  81
  82                 if (substr) {
  83                         if (sscanf(substr, "-n %i", &print_mails) != 1) {
  84                                 print_mails = PRINT_MAILS;
  85                         }
  86                 } else {
  87                         print_mails = PRINT_MAILS;
  88                 }
  89                 if (print_mails < 1) {
  90                         print_mails = 1;
  91                 }
  92
  93                 substr = strstr(args, "-t");
  94                 if (substr) {
  95                         if (sscanf(substr, "-t %i", &time_delay) != 1) {
  96                                 time_delay = TIME_DELAY;
  97                         }
  98                 } else {
  99                         time_delay = TIME_DELAY;
 100                 }
 101
 102                 substr = strstr(args, "-fw");
 103                 if (substr) {
 104                         if (sscanf(substr, "-fw %i", &from_width) != 1) {
 105                                 from_width = FROM_WIDTH;
 106                         }
 107                 } else {
 108                         from_width = FROM_WIDTH;
 109                 }
 110
 111                 substr = strstr(args, "-sw");
 112                 if (substr) {
 113                         if (sscanf(substr, "-sw %i", &subject_width) != 1) {
 114                                 subject_width = SUBJECT_WIDTH;
 115                         }
 116                 } else {
 117                         subject_width = SUBJECT_WIDTH;
 118                 }
 119                 /* encapsulated with "'s find first occurrence of " */
 120                 if (args[strlen(args) - 1] == '"') {
 121                         char *start;
 122                         strncpy(mbox_mail_spool, args, DEFAULT_TEXT_BUFFER_SIZE);
 123                         start = strchr(mbox_mail_spool, '"') + 1;
 124
 125                         start[(long) (strrchr(mbox_mail_spool, '"') - start)] = '\0';
 126                         strncpy(mbox_mail_spool, start, DEFAULT_TEXT_BUFFER_SIZE);
 127                 } else {
 128                         char *copy_args = strndup(args, text_buffer_size);
 129                         char *tmp = strtok(copy_args, " ");
 130                         char *start = tmp;
 131
 132                         while (tmp) {
 133                                 tmp = strtok(NULL, " ");
 134                                 if (tmp) {
 135                                         start = tmp;
 136                                 }
 137                         }
 138                         strncpy(mbox_mail_spool, start, DEFAULT_TEXT_BUFFER_SIZE);
 139                         free(copy_args);
 140                 }
 141                 if (strlen(mbox_mail_spool) < 1) {
 142                         CRIT_ERR(NULL, NULL, "Usage: ${mboxscan [-n <number of messages to print>] "
 143                                 "[-fw <from width>] [-sw <subject width>] "
 144                                 "[-t <delay in sec> mbox]}");
 145                 }
 146
 147                 /* allowing $MAIL in the config */
 148                 if (!strcmp(mbox_mail_spool, "$MAIL")) {
 149                         strcpy(mbox_mail_spool, current_mail_spool);
 150                 }
 151
 152                 if (stat(mbox_mail_spool, &statbuf)) {
 153                         CRIT_ERR(NULL, NULL, "can't stat %s: %s", mbox_mail_spool, strerror(errno));
 154                 }
 155                 args_ok = 1;    /* args-computing necessary only once */
 156         }
 157
 158         /* if time_delay not yet reached, then return */
 159         if (current_update_time - last_update < time_delay && !force_rescan) {
 160                 return;
 161         }
 162
 163         last_update = current_update_time;
 164
 165         /* mbox still exists? and get stat-infos */
 166         if (stat(mbox_mail_spool, &statbuf)) {
 167                 ERR("can't stat %s: %s", mbox_mail_spool, strerror(errno));
 168                 output[0] = '\0';       /* delete any output */
 169                 return;
 170         }
 171
 172         /* modification time has not changed, so skip scanning the box */
 173         if (statbuf.st_ctime == last_ctime && statbuf.st_mtime == last_mtime
 174                         && !force_rescan) {
 175                 return;
 176         }
 177
 178         last_ctime = statbuf.st_ctime;
 179         last_mtime = statbuf.st_mtime;
 180
 181         /* build up double-linked ring-list to hold data, while scanning down the
 182          * mbox */
 183         for (i = 0; i < print_mails; i++) {
 184                 curr = (struct ring_list *) malloc(sizeof(struct ring_list));
 185                 curr->from = (char *) malloc(sizeof(char[from_width + 1]));
 186                 curr->subject = (char *) malloc(sizeof(char[subject_width + 1]));
 187                 curr->from[0] = '\0';
 188                 curr->subject[0] = '\0';
 189
 190                 if (i == 0) {
 191                         startlist = curr;
 192                 }
 193                 if (i > 0) {
 194                         curr->previous = prev;
 195                         prev->next = curr;
 196                 }
 197                 prev = curr;
 198         }
 199
 200         /* connect end to start for an endless loop-ring */
 201         startlist->previous = curr;
 202         curr->next = startlist;
 203
 204         /* mbox */
 205         fp = fopen(mbox_mail_spool, "r");
 206         if (!fp) {
 207                 return;
 208         }
 209
 210         /* first find a "From " to set it to 0 for header-sarchings */
 211         flag = 1;
 212         while (!feof(fp)) {
 213                 if (fgets(buf, text_buffer_size, fp) == NULL) {
 214                         break;
 215                 }
 216
 217                 if (strncmp(buf, "From ", 5) == 0) {
 218                         curr = curr->next;
 219
 220                         /* skip until \n */
 221                         while (strchr(buf, '\n') == NULL && !feof(fp)) {
 222                                 fgets(buf, text_buffer_size, fp);
 223                         }
 224
 225                         flag = 0;       /* in the headers now */
 226                         continue;
 227                 }
 228
 229                 if (flag == 1) {        /* in the body, so skip */
 230                         continue;
 231                 }
 232
 233                 if (buf[0] == '\n') {
 234                         /* beyond the headers now (empty line), skip until \n */
 235                         /* then search for new mail ("From ") */
 236
 237                         while (strchr(buf, '\n') == NULL && !feof(fp)) {
 238                                 fgets(buf, text_buffer_size, fp);
 239                         }
 240                         flag = 1;       /* in the body now */
 241                         continue;
 242                 }
 243
 244                 if ((strncmp(buf, "X-Status: ", 10) == 0)
 245                                 || (strncmp(buf, "Status: R", 9) == 0)) {
 246
 247                         /* Mail was read or something, so skip that message */
 248                         flag = 1;       /* search for next From */
 249                         curr->subject[0] = '\0';
 250                         curr->from[0] = '\0';
 251                         /* (will get current again on new 'From ' finding) */
 252                         curr = curr->previous;
 253                         /* Skip until \n */
 254                         while (strchr(buf, '\n') == NULL && !feof(fp)) {
 255                                 fgets(buf, text_buffer_size, fp);
 256                         }
 257                         continue;
 258                 }
 259
 260                 /* that covers ^From: and ^from: ^From:<tab> */
 261                 if (strncmp(buf + 1, "rom:", 4) == 0) {
 262
 263                         i = 0;
 264                         u = 6;  /* no "From: " string needed, so skip */
 265                         while (1) {
 266
 267                                 if (buf[u] == '"') {    /* no quotes around names */
 268                                         u++;
 269                                         continue;
 270                                 }
 271
 272                                 /* some are: From: <foo@bar.com> */
 273                                 if (buf[u] == '<' && i > 1) {
 274
 275                                         curr->from[i] = '\0';
 276                                         /* skip until \n */
 277                                         while (strchr(buf, '\n') == NULL && !feof(fp)) {
 278                                                 fgets(buf, text_buffer_size, fp);
 279                                         }
 280                                         break;
 281                                 }
 282
 283                                 if (buf[u] == '\n') {
 284                                         curr->from[i] = '\0';
 285                                         break;
 286                                 }
 287
 288                                 if (buf[u] == '\0') {
 289                                         curr->from[i] = '\0';
 290                                         break;
 291                                 }
 292
 293                                 if (i >= from_width) {
 294                                         curr->from[i] = '\0';
 295                                         /* skip until \n */
 296                                         while (strchr(buf, '\n') == NULL && !feof(fp)) {
 297                                                 fgets(buf, text_buffer_size, fp);
 298                                         }
 299                                         break;
 300                                 }
 301
 302                                 /* nothing special so just set it */
 303                                 curr->from[i++] = buf[u++];
 304                         }
 305                 }
 306
 307                 /* that covers ^Subject: and ^subject: and ^Subjec:<tab> */
 308                 if (strncmp(buf + 1, "ubject:", 7) == 0) {
 309
 310                         i = 0;
 311                         u = 9;  /* no "Subject: " string needed, so skip */
 312                         while (1) {
 313
 314                                 if (buf[u] == '\n') {
 315                                         curr->subject[i] = '\0';
 316                                         break;
 317                                 }
 318                                 if (buf[u] == '\0') {
 319                                         curr->subject[i] = '\0';
 320                                         break;
 321                                 }
 322                                 if (i >= subject_width) {
 323                                         curr->subject[i] = '\0';
 324
 325                                         /* skip until \n */
 326                                         while (strchr(buf, '\n') == NULL && !feof(fp)) {
 327                                                 fgets(buf, text_buffer_size, fp);
 328                                         }
 329                                         break;
 330                                 }
 331
 332                                 /* nothing special so just set it */
 333                                 curr->subject[i++] = buf[u++];
 334                         }
 335                 }
 336         }
 337
 338         fclose(fp);
 339
 340         output[0] = '\0';
 341
 342         i = print_mails;
 343         while (i) {
 344                 struct ring_list *tmp;
 345                 if (curr->from[0] != '\0') {
 346                         if (i != print_mails) {
 347                                 snprintf(buf, text_buffer_size, "\nF: %-*s S: %-*s", from_width,
 348                                         curr->from, subject_width, curr->subject);
 349                         } else {        /* first time - no \n in front */
 350                                 snprintf(buf, text_buffer_size, "F: %-*s S: %-*s", from_width,
 351                                         curr->from, subject_width, curr->subject);
 352                         }
 353                 } else {
 354                         snprintf(buf, text_buffer_size, "\n");
 355                 }
 356                 strncat(output, buf, max_len - strlen(output));
 357
 358                 tmp = curr;
 359                 curr = curr->previous;
 360                 free(tmp->from);
 361                 free(tmp->subject);
 362                 free(tmp);
 363
 364                 i--;
 365         }
 366 }