send.c

   1 #include <ctype.h>
   2 #include <fcntl.h>
   3 #include <stdlib.h>
   4 #include <string.h>
   5 #include <time.h>
   6 #include <unistd.h>
   7 #include <sys/stat.h>
   8 #include "config.h"
   9 #include "mbox.h"
  10 #include "util.h"
  11 #include "send.h"
  12 #include "str.h"
  13
  14 #define USERAGENT               "git://repo.or.cz/mailx.git"
  15
  16 static int isaddr(int c)
  17 {
  18         return isalpha(c) || isdigit(c) || strchr("_.-@", c);
  19 }
  20
  21 static char *cut_addr(char *dst, char *src)
  22 {
  23         while (*src && !isaddr(*src))
  24                 src++;
  25         while (isaddr(*src))
  26                 *dst++ = *src++;
  27         *dst++ = '\0';
  28         return src;
  29 }
  30
  31 static int parse_addr(char **recips, int size, char *s, int len)
  32 {
  33         int n = 0;
  34         char *d = s + len;
  35         while (n < size && s < d && *(s = cut_addr(recips[n], s)))
  36                 if (strchr(recips[n], '@'))
  37                         n++;
  38         return n;
  39 }
  40
  41 static int mail_recips(char **recips, int size, char *s)
  42 {
  43         struct mail mail = {{0}};
  44         char *to, *cc;
  45         int n = 0;
  46         mail_read(&mail, s);
  47         if ((to = mail_hdr(&mail, "To:")))
  48                 n += parse_addr(recips + n, size - n, to + 3, hdr_len(to) - 3);
  49         if ((cc = mail_hdr(&mail, "CC:")))
  50                 n += parse_addr(recips + n, size - n, cc + 3, hdr_len(cc) - 3);
  51         return n;
  52 }
  53
  54 static char *put_from_(char *s)
  55 {
  56         time_t t;
  57         time(&t);
  58         s = put_str(s, "From ");
  59         s = put_str(s, getlogin());
  60         s += strftime(s, MAXLINE, " %a %b %d %H:%M:%S %Y\n", localtime(&t));
  61         return s;
  62 }
  63
  64 static char *put_date(char *s)
  65 {
  66         long tz;
  67         time_t t;
  68         time(&t);
  69         tzset();
  70         s = put_str(s, "Date: ");
  71         s += strftime(s, MAXLINE, "%a, %d %b %Y %H:%M:%S ", localtime(&t));
  72         tz = abs(timezone);
  73         *s++ = timezone < 0 ? '-' : '+';
  74         s = put_intz(s, tz / 3600, 2);
  75         s = put_intz(s, (tz % 3600) / 60, 2);
  76         s = put_str(s, "\n");
  77         return s;
  78 }
  79
  80 static char *put_id(char *s)
  81 {
  82         time_t t;
  83         time(&t);
  84         s = put_str(s, "Message-ID: <");
  85         s += strftime(s, MAXLINE, "%Y%d%m%H%M%S", localtime(&t));
  86         s = put_str(s, "@" HOSTNAME ">\n");
  87         return s;
  88 }
  89
  90 static char *put_from(char *s)
  91 {
  92         return FROM ? put_str(s, "From: " FROM "\n") : s;
  93 }
  94
  95 static char *put_to(char *s, char **to, int n)
  96 {
  97         int i;
  98         s = put_str(s, "To: ");
  99         s = put_str(s, to[0]);
 100         for (i = 1; i < n; i++) {
 101                 s = put_str(s, ",\n\t");
 102                 s = put_str(s, to[i]);
 103         }
 104         if (*(s - 1) != '\n')
 105                 s = put_str(s, "\n");
 106         return s;
 107 }
 108
 109 static char *put_subj(char *s, char *subj)
 110 {
 111         s = put_str(s, "Subject: ");
 112         s = put_str(s, subj);
 113         s = put_str(s, "\n");
 114         return s;
 115 }
 116
 117 static char *put_agent(char *s)
 118 {
 119         return put_str(s, "User-Agent: " USERAGENT "\n");
 120 }
 121
 122 void draft_init(struct draft *draft, char **to, int nto, char *subj)
 123 {
 124         char *s = draft->mail;
 125         s = put_from_(s);
 126         s = put_date(s);
 127         s = put_from(s);
 128         if (to && nto)
 129                 s = put_to(s, to, nto);
 130         if (subj)
 131                 s = put_subj(s, subj);
 132         s = put_id(s);
 133         s = put_agent(s);
 134         draft->len = s - draft->mail;
 135 }
 136
 137 static char *hdr_val(char *hdr)
 138 {
 139         hdr = strchr(hdr, ':') + 1;
 140         while (isspace(*hdr))
 141                 hdr++;
 142         return hdr;
 143 }
 144
 145 static char *put_replysubj(char *s, char *subj)
 146 {
 147         subj = hdr_val(subj);
 148         s = put_str(s, "Subject: ");
 149         if (tolower(subj[0]) != 'r' || tolower(subj[1]) != 'e')
 150                 s = put_str(s, "Re: ");
 151         s = put_mem(s, subj, hdr_len(subj));
 152         return s;
 153 }
 154
 155 static char *put_replyto(char *s, char *id, char *ref)
 156 {
 157         s = put_str(s, "In-Reply-To: ");
 158         id = hdr_val(id);
 159         s = put_mem(s, id, hdr_len(id));
 160         s = put_str(s, "References: ");
 161         if (ref) {
 162                 ref = hdr_val(ref);
 163                 s = put_mem(s, ref, hdr_len(ref));
 164                 s = put_str(s, "\t");
 165         }
 166         s = put_mem(s, id, hdr_len(id));
 167         return s;
 168 }
 169
 170 static char *put_reply(char *s, char *from, char *to, char *cc)
 171 {
 172         if (from) {
 173                 from = hdr_val(from);
 174                 s = put_str(s, "To: ");
 175                 s = put_mem(s, from, hdr_len(from));
 176         }
 177         if (to || cc) {
 178                 s = put_str(s, "Cc: ");
 179                 if (to) {
 180                         to = hdr_val(to);
 181                         s = put_mem(s, to, hdr_len(to));
 182                 }
 183                 if (cc) {
 184                         cc = hdr_val(cc);
 185                         if (to) {
 186                                 while (strchr("\r\n ", *(s - 1)))
 187                                         s--;
 188                                 s = put_str(s, ",\n\t");
 189                         }
 190                         s = put_mem(s, cc, hdr_len(cc));
 191                 }
 192         }
 193         return s;
 194 }
 195
 196 static char *quote_body(char *s, int size, struct mail *mail)
 197 {
 198         char *from = mail_hdr(mail, "From:");
 199         char *r = mail->body;
 200         char *rd = r + mail->body_len;
 201         char *sd = s + size - 16;
 202         s = put_str(s, "\n");
 203         if (from) {
 204                 from = hdr_val(from);
 205                 s = put_mem(s, from, hdr_len(from) - 1);
 206                 s = put_str(s, " wrote:\n");
 207         }
 208         while (s < sd && r < rd) {
 209                 char *nl = memchr(r, '\n', rd - r);
 210                 s = put_str(s, "> ");
 211                 nl = nl ? nl + 1 : rd;
 212                 s = put_mem(s, r, MIN(sd - s, nl - r));
 213                 r = nl;
 214         }
 215         *s = '\0';
 216         return s;
 217 }
 218
 219 void draft_reply(struct draft *draft, struct mail *mail)
 220 {
 221         char *s = draft->mail;
 222         char *id_hdr = mail_hdr(mail, "Message-ID:");
 223         char *ref_hdr = mail_hdr(mail, "References:");
 224         char *from_hdr = mail_hdr(mail, "From:");
 225         char *subj_hdr = mail_hdr(mail, "Subject:");
 226         char *to_hdr = mail_hdr(mail, "To:");
 227         char *cc_hdr = mail_hdr(mail, "CC:");
 228
 229         s = put_from_(s);
 230         s = put_date(s);
 231         s = put_from(s);
 232         s = put_reply(s, from_hdr, to_hdr, cc_hdr);
 233         if (subj_hdr)
 234                 s = put_replysubj(s, subj_hdr);
 235         s = put_id(s);
 236         if (id_hdr)
 237                 s = put_replyto(s, id_hdr, ref_hdr);
 238         s = put_agent(s);
 239         s = quote_body(s, sizeof(draft->mail) - (s - draft->mail), mail);
 240         draft->len = s - draft->mail;
 241 }
 242
 243 void draft_edit(struct draft *draft, char *editor)
 244 {
 245         char *edit_argv[] = {NULL, DRAFT, NULL};
 246         int fd;
 247         if ((fd = open(DRAFT, O_WRONLY | O_CREAT, S_IRUSR | S_IWUSR)) == -1)
 248                 return;
 249         xwrite(fd, draft->mail, draft->len);
 250         close(fd);
 251         edit_argv[0] = editor;
 252         exec_file(editor, edit_argv);
 253         if ((fd = open(DRAFT, O_RDONLY)) == -1)
 254                 return;
 255         draft->len = xread(fd, draft->mail, sizeof(draft->mail) - 1);
 256         close(fd);
 257         draft->mail[draft->len] = '\0';
 258         unlink(DRAFT);
 259 }
 260
 261 void draft_send(struct draft *draft)
 262 {
 263         char recips[MAXRECP][MAXLINE];
 264         char *send_argv[MAXRECP + 3] = {SENDMAIL, "-i"};
 265         char *beg = strchr(draft->mail, '\n') + 1;
 266         char *end = draft->mail + draft->len;
 267         int i;
 268         for (i = 0; i < MAXRECP; i++)
 269                 send_argv[i + 2] = recips[i];
 270         send_argv[2 + mail_recips(send_argv + 2, MAXRECP, draft->mail)] = NULL;
 271         exec_pipe(SENDMAIL, send_argv, beg, end - beg);
 272 }
 273
 274 static void write_nofrom(int fd, char *s, int len)
 275 {
 276         char *beg = s;
 277         char *d = s + len;
 278         char *r;
 279         while (s < d) {
 280                 if (!strncmp("\nFrom ", s, 6)) {
 281                         write(fd, beg, s - beg + 1);
 282                         write(fd, ">", 1);
 283                         beg = s + 1;
 284                 }
 285                 r = strchr(s + 1, '\n');
 286                 s = r ? r : d;
 287         }
 288         write(fd, beg, s - beg);
 289 }
 290
 291 void draft_save(struct draft *draft, char *path)
 292 {
 293         int fd = open(path, O_WRONLY | O_APPEND | O_CREAT, S_IRUSR | S_IWUSR);
 294         if (fd < -1)
 295                 return;
 296         write_nofrom(fd, draft->mail, draft->len);
 297         write(fd, "\n", 1);
 298         close(fd);
 299 }