pg.c

   1 #include <ctype.h>
   2 #include <stdio.h>
   3 #include <stdlib.h>
   4 #include <string.h>
   5 #include <time.h>
   6 #include "mail.h"
   7
   8 #define USERAGENT       "neatmail (git://repo.or.cz/neatmail.git)"
   9
  10 static void msg_new(char **msg, long *msglen);
  11 static int msg_reply(char *msg, long msglen, char **mod, long *modlen);
  12 static int msg_forward(char *msg, long msglen, char **mod, long *modlen);
  13
  14 static char *segment(char *d, char *s, int m)
  15 {
  16         char *r = strchr(s, m);
  17         char *e = r ? r + 1 : strchr(s, '\0');
  18         memcpy(d, s, e - s);
  19         d[e - s] = '\0';
  20         return e;
  21 }
  22
  23 static int msg_filter(char *msg, long msglen, char **mod, long *modlen, char *hdrs)
  24 {
  25         struct sbuf *sb = sbuf_make();
  26         char *hdr = malloc(strlen(hdrs) + 1);
  27         char *s = msg;
  28         char *e = msg + msglen;
  29         while ((hdrs = segment(hdr, hdrs, ':')) && hdr[0]) {
  30                 char *val = msg_get(msg, msglen, hdr);
  31                 if (val)
  32                         sbuf_mem(sb, val, hdrlen(val, msg + msglen - val));
  33         }
  34         free(hdr);
  35         while (s + 1 < e && (s[0] != '\n' || s[1] != '\n'))
  36                 s++;
  37         s++;
  38         sbuf_mem(sb, s, e - s);
  39         *modlen = sbuf_len(sb);
  40         *mod = sbuf_done(sb);
  41         return 0;
  42 }
  43
  44 static char *usage =
  45         "usage: neatmail pg [options] mbox msg\n\n"
  46         "options:\n"
  47         "   -h hdrs \tthe list of headers to include\n"
  48         "   -m      \tdecode mime message\n"
  49         "   -r      \tgenerate a reply\n"
  50         "   -f      \tgenerate a forward\n"
  51         "   -n      \tgenerate a new message\n";
  52
  53 int pg(char *argv[])
  54 {
  55         char *mbox, *addr;
  56         char *msg, *mod;
  57         char *hdrs = NULL;
  58         long msglen, modlen;
  59         int demime = 0;
  60         int reply = 0;
  61         int forward = 0;
  62         int newmsg = 0;
  63         int i;
  64         for (i = 0; argv[i] && argv[i][0] == '-'; i++) {
  65                 if (argv[i][1] == 'm')
  66                         demime = 1;
  67                 if (argv[i][1] == 'r')
  68                         reply = 1;
  69                 if (argv[i][1] == 'n')
  70                         newmsg = 1;
  71                 if (argv[i][1] == 'f')
  72                         forward = 1;
  73                 if (argv[i][1] == 'h') {
  74                         hdrs = argv[i][2] ? argv[i] + 2 : argv[++i];
  75                         continue;
  76                 }
  77         }
  78         if (newmsg) {
  79                 msg_new(&msg, &msglen);
  80                 xwrite(1, msg, msglen);
  81                 free(msg);
  82                 return 0;
  83         }
  84         if (!argv[i] || !argv[i + 1]) {
  85                 printf("%s", usage);
  86                 return 1;
  87         }
  88         mbox = argv[i];
  89         addr = argv[i + 1];
  90         if (!mbox_ith(mbox, atoi(addr), &msg, &msglen)) {
  91                 if (demime && !msg_demime(msg, msglen, &mod, &modlen)) {
  92                         free(msg);
  93                         msg = mod;
  94                         msglen = modlen;
  95                 }
  96                 if (reply && !msg_reply(msg, msglen, &mod, &modlen)) {
  97                         free(msg);
  98                         msg = mod;
  99                         msglen = modlen;
 100                 }
 101                 if (hdrs && !msg_filter(msg, msglen, &mod, &modlen, hdrs)) {
 102                         free(msg);
 103                         msg = mod;
 104                         msglen = modlen;
 105                 }
 106                 if (forward && !msg_forward(msg, msglen, &mod, &modlen)) {
 107                         free(msg);
 108                         msg = mod;
 109                         msglen = modlen;
 110                 }
 111                 xwrite(1, msg, msglen);
 112                 free(msg);
 113         }
 114         return 0;
 115 }
 116
 117 static void put_from_(struct sbuf *sb)
 118 {
 119         char buf[128];
 120         time_t t;
 121         time(&t);
 122         strftime(buf, sizeof(buf), "%a %b %d %H:%M:%S %Y", localtime(&t));
 123         sbuf_printf(sb, "From %s %s\n",
 124                 getenv("LOGNAME") ? getenv("LOGNAME") : "me", buf);
 125 }
 126
 127 static void put_date(struct sbuf *sb)
 128 {
 129         char buf[128];
 130         time_t t;
 131         time(&t);
 132         strftime(buf, sizeof(buf), "%a, %d %b %Y %H:%M:%S %z", localtime(&t));
 133         sbuf_printf(sb, "Date: %s\n", buf);
 134 }
 135
 136 static void put_id(struct sbuf *sb)
 137 {
 138         char buf[128];
 139         char host[32] = "neatmail.host";
 140         time_t t;
 141         time(&t);
 142         strftime(buf, sizeof(buf), "%Y%d%m%H%M%S", localtime(&t));
 143         sbuf_printf(sb, "Message-ID: <%s@%s>\n", buf, host);
 144 }
 145
 146 static void put_agent(struct sbuf *sb)
 147 {
 148         sbuf_printf(sb, "User-Agent: " USERAGENT "\n");
 149 }
 150
 151 static void msg_new(char **msg, long *msglen)
 152 {
 153         struct sbuf *sb = sbuf_make();
 154         put_from_(sb);
 155         sbuf_printf(sb, "From: \n");
 156         sbuf_printf(sb, "To: \n");
 157         sbuf_printf(sb, "Subject: \n");
 158         put_id(sb);
 159         put_date(sb);
 160         put_agent(sb);
 161         sbuf_chr(sb, '\n');
 162         *msglen = sbuf_len(sb);
 163         *msg = sbuf_done(sb);
 164 }
 165
 166 static char *hdr_val(char *hdr)
 167 {
 168         hdr = strchr(hdr, ':') + 1;
 169         while (isspace(*hdr))
 170                 hdr++;
 171         return hdr;
 172 }
 173
 174 static int hdr_len(char *hdr)
 175 {
 176         int l = hdrlen(hdr, 1024);
 177         while (l > 0 && strchr(" \r\n", (unsigned char) hdr[l - 1]))
 178                 l--;
 179         return l;
 180 }
 181
 182 static void put_subjreply(struct sbuf *sb, char *subj)
 183 {
 184         subj = hdr_val(subj);
 185         sbuf_str(sb, "Subject: ");
 186         if (tolower(subj[0]) != 'r' || tolower(subj[1]) != 'e')
 187                 sbuf_str(sb, "Re: ");
 188         sbuf_mem(sb, subj, hdr_len(subj));
 189         sbuf_str(sb, "\n");
 190 }
 191
 192 static void put_subjfwd(struct sbuf *sb, char *subj)
 193 {
 194         subj = hdr_val(subj);
 195         sbuf_str(sb, "Subject: ");
 196         sbuf_str(sb, "Fwd: ");
 197         sbuf_mem(sb, subj, hdr_len(subj));
 198         sbuf_str(sb, "\n");
 199 }
 200
 201 static void put_replyto(struct sbuf *sb, char *id, char *ref)
 202 {
 203         id = hdr_val(id);
 204         sbuf_str(sb, "In-Reply-To: ");
 205         sbuf_mem(sb, id, hdr_len(id));
 206         sbuf_str(sb, "\n");
 207         sbuf_str(sb, "References: ");
 208         if (ref) {
 209                 ref = hdr_val(ref);
 210                 sbuf_mem(sb, ref, hdr_len(ref));
 211                 sbuf_str(sb, "\n\t");
 212         }
 213         sbuf_mem(sb, id, hdr_len(id));
 214         sbuf_str(sb, "\n");
 215 }
 216
 217 static void put_reply(struct sbuf *sb, char *from, char *to, char *cc, char *rply)
 218 {
 219         if (from || rply) {
 220                 char *hdr = rply ? rply : from;
 221                 hdr = hdr_val(hdr);
 222                 sbuf_str(sb, "To: ");
 223                 sbuf_mem(sb, hdr, hdr_len(hdr));
 224                 sbuf_str(sb, "\n");
 225         }
 226         if (to || cc || (rply && from)) {
 227                 int n = 0;
 228                 sbuf_str(sb, "Cc: ");
 229                 if (to) {
 230                         to = hdr_val(to);
 231                         if (n++)
 232                                 sbuf_str(sb, ",\n\t");
 233                         sbuf_mem(sb, to, hdr_len(to));
 234                 }
 235                 if (rply && from) {
 236                         from = hdr_val(from);
 237                         if (n++)
 238                                 sbuf_str(sb, ",\n\t");
 239                         sbuf_mem(sb, from, hdr_len(from));
 240                 }
 241                 if (cc) {
 242                         cc = hdr_val(cc);
 243                         if (n++)
 244                                 sbuf_str(sb, ",\n\t");
 245                         sbuf_mem(sb, cc, hdr_len(cc));
 246                 }
 247                 sbuf_str(sb, "\n");
 248         }
 249 }
 250
 251 static void quote_body(struct sbuf *sb, char *msg, long msglen)
 252 {
 253         char *from = msg_get(msg, msglen, "From:");
 254         char *s = msg;
 255         char *e = msg + msglen;
 256         while (s + 1 < e && (s[0] != '\n' || s[1] != '\n'))
 257                 s++;
 258         s += 2;
 259         sbuf_chr(sb, '\n');
 260         if (from) {
 261                 from = hdr_val(from);
 262                 sbuf_mem(sb, from, hdr_len(from));
 263                 sbuf_str(sb, " wrote:\n");
 264         }
 265         while (s < e) {
 266                 char *r = memchr(s, '\n', e - s);
 267                 if (!r)
 268                         break;
 269                 sbuf_str(sb, "> ");
 270                 sbuf_mem(sb, s, r - s + 1);
 271                 s = r + 1;
 272         }
 273 }
 274
 275 static int msg_reply(char *msg, long msglen, char **mod, long *modlen)
 276 {
 277         struct sbuf *sb = sbuf_make();
 278         char *id_hdr = msg_get(msg, msglen, "Message-ID:");
 279         char *ref_hdr = msg_get(msg, msglen, "References:");
 280         char *from_hdr = msg_get(msg, msglen, "From:");
 281         char *subj_hdr = msg_get(msg, msglen, "Subject:");
 282         char *to_hdr = msg_get(msg, msglen, "To:");
 283         char *cc_hdr = msg_get(msg, msglen, "CC:");
 284         char *rply_hdr = msg_get(msg, msglen, "Reply-To:");
 285         put_from_(sb);
 286         put_date(sb);
 287         sbuf_printf(sb, "From: \n");
 288         put_reply(sb, from_hdr, to_hdr, cc_hdr, rply_hdr);
 289         if (subj_hdr)
 290                 put_subjreply(sb, subj_hdr);
 291         put_id(sb);
 292         if (id_hdr)
 293                 put_replyto(sb, id_hdr, ref_hdr);
 294         put_agent(sb);
 295         quote_body(sb, msg, msglen);
 296         *modlen = sbuf_len(sb);
 297         *mod = sbuf_done(sb);
 298         return 0;
 299 }
 300
 301 static int msg_forward(char *msg, long msglen, char **mod, long *modlen)
 302 {
 303         struct sbuf *sb = sbuf_make();
 304         char *subj_hdr = msg_get(msg, msglen, "Subject:");
 305         put_from_(sb);
 306         put_date(sb);
 307         sbuf_printf(sb, "From: \n");
 308         sbuf_printf(sb, "To: \n");
 309         put_subjfwd(sb, subj_hdr);
 310         put_id(sb);
 311         put_agent(sb);
 312         sbuf_str(sb, "\n-------- Original Message --------\n");
 313         sbuf_mem(sb, msg, msglen);
 314         *modlen = sbuf_len(sb);
 315         *mod = sbuf_done(sb);
 316         return 0;
 317 }