adam@0: #include <stdio.h>
adam@0: #include <string.h>
adam@0: #include <stdlib.h>
adam@0: #include <ctype.h>
adam@0: #include <sys/types.h>
adam@0: #include <sys/socket.h>
adam@0: #include <netinet/in.h>
adam@0: #include <arpa/inet.h>
adam@0: 
adam@0: #include <urweb.h>
adam@0: 
adam@0: struct headers {
adam@0:   uw_Basis_string from, to, cc, bcc, subject;
adam@0: };
adam@0: 
adam@0: typedef struct headers *uw_Mail_headers;
adam@0: 
adam@0: uw_Mail_headers uw_Mail_empty = NULL;
adam@0: 
adam@0: static void header(uw_context ctx, uw_Basis_string s) {
adam@0:   if (strlen(s) > 100)
adam@0:     uw_error(ctx, FATAL, "Header value too long");
adam@0: 
adam@0:   for (; *s; ++s)
adam@0:     if (*s == '\r' || *s == '\n')
adam@0:       uw_error(ctx, FATAL, "Header value contains newline");
adam@0: }
adam@0: 
adam@0: static void address(uw_context ctx, uw_Basis_string s) {
adam@0:   header(ctx, s);
adam@0: 
adam@0:   if (strchr(s, ','))
adam@0:     uw_error(ctx, FATAL, "E-mail address contains comma");
adam@0: }
adam@0: 
adam@0: uw_Mail_headers uw_Mail_from(uw_context ctx, uw_Basis_string s, uw_Mail_headers h) {
adam@0:   // char **allowed = uw_get_global(ctx, "mail_from");
adam@0:   // Might add this policy checking (or some expanded version of it) back later.
adam@0:   uw_Mail_headers h2 = uw_malloc(ctx, sizeof(struct headers));
adam@0: 
adam@0:   if (h)
adam@0:     *h2 = *h;
adam@0:   else
adam@0:     memset(h2, 0, sizeof(*h2));
adam@0: 
adam@0:   if (h2->from)
adam@0:     uw_error(ctx, FATAL, "Duplicate From header");
adam@0: 
adam@0:   /*
adam@0:   if (!allowed)
adam@0:     uw_error(ctx, FATAL, "No From address whitelist has been set.  Perhaps you are not authorized to send e-mail.");
adam@0: 
adam@0:   if (!(allowed[0] && !strcmp(allowed[0], "*"))) {
adam@0:     for (; *allowed; ++allowed)
adam@0:       if (!strcmp(*allowed, s))
adam@0:         goto ok;
adam@0: 
adam@0:     uw_error(ctx, FATAL, "From address is not in whitelist");
adam@0:   }
adam@0: 
adam@0:  ok:
adam@0:   */
adam@0:   address(ctx, s);
adam@0:   h2->from = s;
adam@0: 
adam@0:   return h2;
adam@0: }
adam@0: 
adam@0: uw_Mail_headers uw_Mail_to(uw_context ctx, uw_Basis_string s, uw_Mail_headers h) {
adam@0:   uw_Mail_headers h2 = uw_malloc(ctx, sizeof(struct headers));
adam@0:   if (h)
adam@0:     *h2 = *h;
adam@0:   else
adam@0:     memset(h2, 0, sizeof(*h2));
adam@0: 
adam@0:   address(ctx, s);
adam@0:   if (h2->to) {
adam@4:     uw_Basis_string all = uw_malloc(ctx, strlen(h2->to) + 2 + strlen(s));
adam@0:     sprintf(all, "%s,%s", h2->to, s);
adam@0:     h2->to = all;
adam@0:   } else
adam@0:     h2->to = s;
adam@0: 
adam@0:   return h2;
adam@0: }
adam@0: 
adam@0: uw_Mail_headers uw_Mail_cc(uw_context ctx, uw_Basis_string s, uw_Mail_headers h) {
adam@0:   uw_Mail_headers h2 = uw_malloc(ctx, sizeof(struct headers));
adam@0:   if (h)
adam@0:     *h2 = *h;
adam@0:   else
adam@0:     memset(h2, 0, sizeof(*h2));
adam@0: 
adam@0:   address(ctx, s);
adam@0:   if (h2->cc) {
adam@0:     uw_Basis_string all = uw_malloc(ctx, strlen(h2->cc) + 1 + strlen(s));
adam@0:     sprintf(all, "%s,%s", h2->cc, s);
adam@0:     h2->cc = all;
adam@0:   } else
adam@0:     h2->cc = s;
adam@0: 
adam@0:   return h2;
adam@0: }
adam@0: 
adam@0: uw_Mail_headers uw_Mail_bcc(uw_context ctx, uw_Basis_string s, uw_Mail_headers h) {
adam@0:   uw_Mail_headers h2 = uw_malloc(ctx, sizeof(struct headers));
adam@0:   if (h)
adam@0:     *h2 = *h;
adam@0:   else
adam@0:     memset(h2, 0, sizeof(*h2));
adam@0: 
adam@0:   address(ctx, s);
adam@0:   if (h2->bcc) {
adam@0:     uw_Basis_string all = uw_malloc(ctx, strlen(h2->bcc) + 1 + strlen(s));
adam@0:     sprintf(all, "%s,%s", h2->bcc, s);
adam@0:     h2->bcc = all;
adam@0:   } else
adam@0:     h2->bcc = s;
adam@0: 
adam@0:   return h2;
adam@0: }
adam@0: 
adam@0: uw_Mail_headers uw_Mail_subject(uw_context ctx, uw_Basis_string s, uw_Mail_headers h) {
adam@0:   uw_Mail_headers h2 = uw_malloc(ctx, sizeof(struct headers));
adam@0: 
adam@0:   if (h)
adam@0:     *h2 = *h;
adam@0:   else
adam@0:     memset(h2, 0, sizeof(*h2));
adam@0: 
adam@0:   if (h2->subject)
adam@0:     uw_error(ctx, FATAL, "Duplicate Subject header");
adam@0: 
adam@0:   header(ctx, s);
adam@0:   h2->subject = s;
adam@0: 
adam@0:   return h2;
adam@0: }
adam@0: 
adam@0: typedef struct {
adam@0:   uw_context ctx;
adam@0:   uw_Mail_headers h;
adam@0:   uw_Basis_string body, xbody;
adam@0: } job;
adam@0: 
adam@0: #define BUFLEN 1024
adam@0: 
adam@0: static int smtp_read(uw_context ctx, int sock, char *buf, ssize_t *pos) {
adam@0:   char *s;
adam@0: 
adam@0:   while (1) {
adam@0:     ssize_t recvd;
adam@0: 
adam@0:     buf[*pos] = 0;
adam@0:   
adam@0:     if ((s = strchr(buf, '\n'))) {
adam@0:       int n;
adam@0: 
adam@0:       *s = 0;
adam@0: 
adam@0:       if (sscanf(buf, "%d ", &n) != 1) {
adam@0:         close(sock);
adam@0:         uw_set_error_message(ctx, "Mail server response does not begin with a code.");
adam@0:         return 0;
adam@0:       }
adam@0: 
adam@0:       *pos -= s - buf + 1;
adam@0:       memmove(buf, s+1, *pos);
adam@0: 
adam@0:       return n;
adam@0:     }
adam@0: 
adam@0:     recvd = recv(sock, buf + *pos, BUFLEN - *pos - 1, 0);
adam@0: 
adam@0:     if (recvd == 0) {
adam@0:       close(sock);
adam@0:       uw_set_error_message(ctx, "Mail server response ends unexpectedly.");
adam@0:       return 0;
adam@0:     } else if (recvd < 0) {
adam@0:       close(sock);
adam@0:       uw_set_error_message(ctx, "Error reading mail server response.");
adam@0:       return 0;
adam@0:     }
adam@0: 
adam@0:     *pos += recvd;
adam@0:   }
adam@0: }
adam@0: 
adam@0: static int really_string(int sock, const char *s) {
adam@0:   return uw_really_send(sock, s, strlen(s));
adam@0: }
adam@0: 
adam@0: static int sendAddrs(const char *kind, uw_context ctx, int sock, char *s, char *buf, ssize_t *pos) {
adam@0:   char *p;
adam@0:   char out[BUFLEN];
adam@0: 
adam@0:   if (!s)
adam@0:     return 0;
adam@0: 
adam@0:   for (p = strchr(s, ','); p; p = strchr(p+1, ',')) {
adam@0:     *p = 0;
adam@0: 
adam@2:     snprintf(out, sizeof(out), "RCPT TO:%s\r\n", s);
adam@0:     out[sizeof(out)-1] = 0;
adam@0:     *p = ',';
adam@0: 
adam@0:     if (really_string(sock, out) < 0) {
adam@0:       close(sock);
adam@0:       uw_set_error_message(ctx, "Error sending RCPT TO for %s", kind);
adam@0:       return 1;
adam@0:     }
adam@0: 
adam@0:     if (smtp_read(ctx, sock, buf, pos) != 250) {
adam@0:       close(sock);
adam@0:       uw_set_error_message(ctx, "Mail server doesn't respond to %s RCPT TO with code 250.", kind);
adam@0:       return 1;
adam@0:     }
adam@0:   }
adam@0: 
adam@0:   if (*s) {
adam@2:     snprintf(out, sizeof(out), "RCPT TO:%s\r\n", s);
adam@0:     out[sizeof(out)-1] = 0;
adam@0: 
adam@0:     if (really_string(sock, out) < 0) {
adam@0:       close(sock);
adam@0:       uw_set_error_message(ctx, "Error sending RCPT TO for %s", kind);
adam@0:       return 1;
adam@0:     }
adam@0: 
adam@0:     if (smtp_read(ctx, sock, buf, pos) != 250) {
adam@0:       close(sock);
adam@0:       uw_set_error_message(ctx, "Mail server doesn't respond to %s RCPT TO with code 250.", kind);
adam@0:       return 1;
adam@0:     }
adam@0:   }
adam@0: 
adam@0:   return 0;
adam@0: }
adam@0: 
adam@0: static void commit(void *data) {
adam@0:   job *j = data;
adam@0:   int sock;
adam@0:   struct sockaddr_in my_addr;
adam@0:   char buf[BUFLEN], out[BUFLEN];
adam@0:   ssize_t pos = 0;
adam@0:   char *s;
adam@0: 
adam@0:   if ((sock = socket(PF_INET, SOCK_STREAM, 0)) < 0) {
adam@0:     uw_set_error_message(j->ctx, "Can't create socket for mail server connection");
adam@0:     return;
adam@0:   }
adam@0: 
adam@0:   my_addr.sin_family = AF_INET;
adam@0:   my_addr.sin_port = htons(25);
adam@0:   my_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
adam@0:   memset(my_addr.sin_zero, 0, sizeof my_addr.sin_zero);
adam@0: 
adam@0:   if (connect(sock, (struct sockaddr *)&my_addr, sizeof my_addr) < 0) {
adam@0:     close(sock);
adam@0:     uw_set_error_message(j->ctx, "Error connecting to mail server");
adam@0:     return;
adam@0:   }
adam@0: 
adam@0:   if (smtp_read(j->ctx, sock, buf, &pos) != 220) {
adam@0:     close(sock);
adam@0:     uw_set_error_message(j->ctx, "Mail server doesn't greet with code 220.");
adam@0:     return;
adam@0:   }
adam@0: 
adam@2:   if (really_string(sock, "HELO localhost\r\n") < 0) {
adam@0:     close(sock);
adam@0:     uw_set_error_message(j->ctx, "Error sending HELO");
adam@0:     return;
adam@0:   }
adam@0: 
adam@0:   if (smtp_read(j->ctx, sock, buf, &pos) != 250) {
adam@0:     close(sock);
adam@0:     uw_set_error_message(j->ctx, "Mail server doesn't respond to HELO with code 250.");
adam@0:     return;
adam@0:   }
adam@0: 
adam@2:   snprintf(out, sizeof(out), "MAIL FROM:%s\r\n", j->h->from);
adam@0:   out[sizeof(out)-1] = 0;
adam@0: 
adam@0:   if (really_string(sock, out) < 0) {
adam@0:     close(sock);
adam@0:     uw_set_error_message(j->ctx, "Error sending MAIL FROM");
adam@0:     return;
adam@0:   }
adam@0: 
adam@0:   if (smtp_read(j->ctx, sock, buf, &pos) != 250) {
adam@0:     close(sock);
adam@0:     uw_set_error_message(j->ctx, "Mail server doesn't respond to MAIL FROM with code 250.");
adam@0:     return;
adam@0:   }
adam@0: 
adam@0:   if (sendAddrs("To", j->ctx, sock, j->h->to, buf, &pos)) return;
adam@0:   if (sendAddrs("Cc", j->ctx, sock, j->h->cc, buf, &pos)) return;
adam@0:   if (sendAddrs("Bcc", j->ctx, sock, j->h->bcc, buf, &pos)) return;
adam@0: 
adam@2:   if (really_string(sock, "DATA\r\n") < 0) {
adam@0:     close(sock);
adam@0:     uw_set_error_message(j->ctx, "Error sending DATA");
adam@0:     return;
adam@0:   }
adam@0: 
adam@0:   if (smtp_read(j->ctx, sock, buf, &pos) != 354) {
adam@0:     close(sock);
adam@0:     uw_set_error_message(j->ctx, "Mail server doesn't respond to DATA with code 354.");
adam@0:     return;
adam@0:   }
adam@0: 
adam@0:   snprintf(out, sizeof(out), "From: %s\r\n", j->h->from);
adam@0:   out[sizeof(out)-1] = 0;
adam@0: 
adam@0:   if (really_string(sock, out) < 0) {
adam@0:     close(sock);
adam@0:     uw_set_error_message(j->ctx, "Error sending From");
adam@0:     return;
adam@0:   }
adam@0: 
adam@0:   if (j->h->subject) {
adam@0:     snprintf(out, sizeof(out), "Subject: %s\r\n", j->h->subject);
adam@0:     out[sizeof(out)-1] = 0;
adam@0: 
adam@0:     if (really_string(sock, out) < 0) {
adam@0:       close(sock);
adam@0:       uw_set_error_message(j->ctx, "Error sending Subject");
adam@0:       return;
adam@0:     }
adam@0:   }
adam@0: 
adam@0:   if (j->h->to) {
adam@0:     snprintf(out, sizeof(out), "To: %s\r\n", j->h->to);
adam@0:     out[sizeof(out)-1] = 0;
adam@0: 
adam@0:     if (really_string(sock, out) < 0) {
adam@0:       close(sock);
adam@0:       uw_set_error_message(j->ctx, "Error sending To");
adam@0:       return;
adam@0:     }
adam@0:   }
adam@0: 
adam@0:   if (j->h->cc) {
adam@0:     snprintf(out, sizeof(out), "Cc: %s\r\n", j->h->cc);
adam@0:     out[sizeof(out)-1] = 0;
adam@0: 
adam@0:     if (really_string(sock, out) < 0) {
adam@0:       close(sock);
adam@0:       uw_set_error_message(j->ctx, "Error sending Cc");
adam@0:       return;
adam@0:     }
adam@0:   }
adam@0: 
adam@0:   if (j->h->bcc) {
adam@0:     snprintf(out, sizeof(out), "Bcc: %s\r\n", j->h->bcc);
adam@0:     out[sizeof(out)-1] = 0;
adam@0: 
adam@0:     if (really_string(sock, out) < 0) {
adam@0:       close(sock);
adam@0:       uw_set_error_message(j->ctx, "Error sending Bcc");
adam@0:       return;
adam@0:     }
adam@0:   }
adam@0: 
adam@0:   if ((s = uw_get_global(j->ctx, "extra_mail_headers"))) {
adam@0:     if (really_string(sock, s) < 0) {
adam@0:       close(sock);
adam@0:       uw_set_error_message(j->ctx, "Error sending extra headers");
adam@0:       return;
adam@0:     }
adam@0:   }
adam@0: 
adam@0:   if (j->xbody) {
adam@0:     char separator[11];
adam@0:     separator[sizeof(separator)-1] = 0;
adam@0: 
adam@0:     do {
adam@0:       int i;
adam@0: 
adam@0:       for (i = 0; i < sizeof(separator)-1; ++i)
adam@0:         separator[i] = 'A' + (rand() % 26);
adam@0:     } while (strstr(j->body, separator) || strstr(j->xbody, separator));
adam@0: 
adam@0:     snprintf(out, sizeof(out), "MIME-Version: 1.0\r\n"
adam@0:              "Content-Type: multipart/alternative; boundary=\"%s\"\r\n"
adam@0:              "\r\n"
adam@0:              "--%s\r\n"
adam@0:              "Content-Type: text/plain\r\n"
adam@0:              "\r\n",
adam@0:              separator, separator);
adam@0:     out[sizeof(out)-1] = 0;
adam@0: 
adam@0:     if (really_string(sock, out) < 0) {
adam@0:       close(sock);
adam@0:       uw_set_error_message(j->ctx, "Error sending multipart beginning");
adam@0:       return;
adam@0:     }
adam@0: 
adam@0:     if (really_string(sock, j->body) < 0) {
adam@0:       close(sock);
adam@0:       uw_set_error_message(j->ctx, "Error sending message text body");
adam@0:       return;
adam@0:     }
adam@0: 
adam@0:     snprintf(out, sizeof(out), "\r\n"
adam@0:              "--%s\r\n"
adam@0:              "Content-Type: text/html\r\n"
adam@0:              "\r\n",
adam@0:              separator);
adam@0:     out[sizeof(out)-1] = 0;
adam@0: 
adam@0:     if (really_string(sock, out) < 0) {
adam@0:       close(sock);
adam@0:       uw_set_error_message(j->ctx, "Error sending multipart middle");
adam@0:       return;
adam@0:     }
adam@0: 
adam@0:     if (really_string(sock, j->xbody) < 0) {
adam@0:       close(sock);
adam@0:       uw_set_error_message(j->ctx, "Error sending message HTML body");
adam@0:       return;
adam@0:     }
adam@0: 
adam@0:     snprintf(out, sizeof(out), "\r\n"
adam@0:              "--%s--",
adam@0:              separator);
adam@0:     out[sizeof(out)-1] = 0;
adam@0: 
adam@0:     if (really_string(sock, out) < 0) {
adam@0:       close(sock);
adam@0:       uw_set_error_message(j->ctx, "Error sending multipart end");
adam@0:       return;
adam@0:     }
adam@0:   } else {
adam@0:     if (really_string(sock, "Content-Type: text/plain\r\n\r\n") < 0) {
adam@0:       close(sock);
adam@0:       uw_set_error_message(j->ctx, "Error sending text Content-Type");
adam@0:       return;
adam@0:     }
adam@0: 
adam@0:     if (really_string(sock, j->body) < 0) {
adam@0:       close(sock);
adam@0:       uw_set_error_message(j->ctx, "Error sending message body");
adam@0:       return;
adam@0:     }
adam@0:   }
adam@0: 
adam@0:   if (really_string(sock, "\r\n.\r\n") < 0) {
adam@0:     close(sock);
adam@0:     uw_set_error_message(j->ctx, "Error sending message terminator");
adam@0:     return;
adam@0:   }
adam@0: 
adam@0:   if (smtp_read(j->ctx, sock, buf, &pos) != 250) {
adam@0:     close(sock);
adam@0:     uw_set_error_message(j->ctx, "Mail server doesn't respond to end of message with code 250.");
adam@0:     return;
adam@0:   }
adam@0: 
adam@2:   if (really_string(sock, "QUIT\r\n") < 0) {
adam@0:     close(sock);
adam@0:     uw_set_error_message(j->ctx, "Error sending QUIT");
adam@0:     return;
adam@0:   }
adam@0: 
adam@0:   if (smtp_read(j->ctx, sock, buf, &pos) != 221) {
adam@0:     close(sock);
adam@0:     uw_set_error_message(j->ctx, "Mail server doesn't respond to QUIT with code 221.");
adam@0:     return;
adam@0:   }
adam@0: 
adam@0:   close(sock);
adam@0: }
adam@0: 
adam@0: uw_unit uw_Mail_send(uw_context ctx, uw_Mail_headers h, uw_Basis_string body, uw_Basis_string xbody) {
adam@0:   job *j;
adam@0:   char *s;
adam@0: 
adam@0:   if (!h || !h->from)
adam@0:     uw_error(ctx, FATAL, "No From address set for e-mail message");
adam@0: 
adam@0:   if (!h->to && !h->cc && !h->bcc)
adam@0:     uw_error(ctx, FATAL, "No recipients specified for e-mail message");
adam@0: 
adam@0:   for (s = strchr(body, '.'); s; s = strchr(s+1, '.'))
adam@0:     if ((s[1] == '\n' || s[1] == '\r')
adam@0:         && (s <= body || s[-1] == '\n' || s[-1] == '\r'))
adam@0:       uw_error(ctx, FATAL, "Message body contains a line with just a period");
adam@0: 
adam@0:   if (xbody) {
adam@0:     for (s = strchr(xbody, '.'); s; s = strchr(s+1, '.'))
adam@0:       if ((s[1] == '\n' || s[1] == '\r')
adam@0:           && (s <= xbody || s[-1] == '\n' || s[-1] == '\r'))
adam@0:         uw_error(ctx, FATAL, "HTML message body contains a line with just a period");
adam@0:   }
adam@0: 
adam@0:   j = uw_malloc(ctx, sizeof(job));
adam@0: 
adam@0:   j->ctx = ctx;
adam@0:   j->h = h;
adam@0:   j->body = body;
adam@0:   j->xbody = xbody;
adam@0: 
adam@0:   uw_register_transactional(ctx, j, commit, NULL, NULL);
adam@0: 
adam@0:   return uw_unit_v;
adam@0: }