1 # include <stdio.h> 2 # include <pwd.h> 3 # include "sendmail.h" 4 5 static char SccsId[] = "@(#)savemail.c 3.9 08/09/81"; 6 7 /* 8 ** SAVEMAIL -- Save mail on error 9 ** 10 ** If the MailBack flag is set, mail it back to the originator 11 ** together with an error message; otherwise, just put it in 12 ** dead.letter in the user's home directory (if he exists on 13 ** this machine). 14 ** 15 ** Parameters: 16 ** none 17 ** 18 ** Returns: 19 ** none 20 ** 21 ** Side Effects: 22 ** Saves the letter, by writing or mailing it back to the 23 ** sender, or by putting it in dead.letter in her home 24 ** directory. 25 ** 26 ** WARNING: the user id is reset to the original user. 27 */ 28 29 savemail() 30 { 31 register struct passwd *pw; 32 register FILE *xfile; 33 char buf[MAXLINE+1]; 34 extern errhdr(); 35 auto ADDRESS to_addr; 36 extern struct passwd *getpwnam(); 37 register char *p; 38 register int i; 39 auto long tim; 40 extern int errno; 41 extern char *ttypath(); 42 extern ADDRESS *parse(); 43 static int exclusive; 44 extern char *strcpy(), *strcat(); 45 extern char *expand(); 46 47 if (exclusive++) 48 return; 49 50 /* 51 ** In the unhappy event we don't know who to return the mail 52 ** to, make someone up. 53 */ 54 55 if (From.q_paddr == NULL) 56 { 57 if (parse("root", &From, 0) == NULL) 58 { 59 syserr("Cannot parse root!"); 60 ExitStat = EX_SOFTWARE; 61 finis(); 62 } 63 } 64 To = NULL; 65 66 /* 67 ** If called from Eric Schmidt's network, do special mailback. 68 ** Fundamentally, this is the mailback case except that 69 ** it returns an OK exit status (assuming the return 70 ** worked). 71 */ 72 73 if (BerkNet) 74 { 75 ExitStat = EX_OK; 76 MailBack++; 77 } 78 79 /* 80 ** If writing back, do it. 81 ** If the user is still logged in on the same terminal, 82 ** then write the error messages back to hir (sic). 83 ** If not, set the MailBack flag so that it will get 84 ** mailed back instead. 85 */ 86 87 if (WriteBack) 88 { 89 p = ttypath(); 90 if (p == NULL || freopen(p, "w", stdout) == NULL) 91 { 92 MailBack++; 93 errno = 0; 94 } 95 else 96 { 97 xfile = fopen(Transcript, "r"); 98 if (xfile == NULL) 99 syserr("Cannot open %s", Transcript); 100 printf("\r\nMessage from %s\r\n", expand("$n", buf, &buf[sizeof buf - 1])); 101 printf("Errors occurred while sending mail, transcript follows:\r\n"); 102 while (fgets(buf, sizeof buf, xfile) && !ferror(stdout)) 103 fputs(buf, stdout); 104 if (ferror(stdout)) 105 syserr("savemail: stdout: write err"); 106 fclose(xfile); 107 } 108 } 109 110 /* 111 ** If mailing back, do it. 112 ** Throw away all further output. Don't do aliases, since 113 ** this could cause loops, e.g., if joe mails to x:joe, 114 ** and for some reason the network for x: is down, then 115 ** the response gets sent to x:joe, which gives a 116 ** response, etc. Also force the mail to be delivered 117 ** even if a version of it has already been sent to the 118 ** sender. 119 */ 120 121 if (MailBack) 122 { 123 freopen("/dev/null", "w", stdout); 124 NoAlias++; 125 ForceMail++; 126 127 /* fake up an address header for the from person */ 128 bmove((char *) &From, (char *) &to_addr, sizeof to_addr); 129 if (parse(expand("$n", buf, &buf[sizeof buf - 1]), &From, -1) == NULL) 130 { 131 syserr("Can't parse myself!"); 132 ExitStat = EX_SOFTWARE; 133 finis(); 134 } 135 i = deliver(&to_addr, errhdr); 136 bmove((char *) &to_addr, (char *) &From, sizeof From); 137 if (i != 0) 138 syserr("Can't return mail to %s", p); 139 else 140 return; 141 } 142 143 /* 144 ** Save the message in dead.letter. 145 ** If we weren't mailing back, and the user is local, we 146 ** should save the message in dead.letter so that the 147 ** poor person doesn't have to type it over again -- 148 ** and we all know what poor typists programmers are. 149 */ 150 151 setuid(getuid()); 152 setgid(getgid()); 153 setpwent(); 154 p = NULL; 155 if (From.q_mailer == M_LOCAL) 156 { 157 if (From.q_home != NULL) 158 p = From.q_home; 159 else if ((pw = getpwnam(From.q_user)) != NULL) 160 p = pw->pw_dir; 161 } 162 if (p == NULL) 163 { 164 syserr("Can't return mail to %s", From.q_paddr); 165 # ifdef DEBUG 166 p = "/usr/tmp"; 167 # else 168 p = NULL; 169 # endif 170 } 171 if (p != NULL) 172 { 173 /* we have a home directory; open dead.letter */ 174 message("050", "Saving message in dead.letter"); 175 define('z', p); 176 expand("$z/dead.letter", buf, &buf[sizeof buf - 1]); 177 To = buf; 178 i = mailfile(buf); 179 giveresponse(i, TRUE, Mailer[M_LOCAL]); 180 } 181 182 /* add terminator to writeback message */ 183 if (WriteBack) 184 printf("-----\r\n"); 185 } 186 /* 187 ** ERRHDR -- Output the header for error mail. 188 ** 189 ** This is the edit filter to error mailbacks. 190 ** 191 ** Algorithm: 192 ** Output fixed header. 193 ** Output the transcript part. 194 ** Output the original message. 195 ** 196 ** Parameters: 197 ** xfile -- the transcript file. 198 ** fp -- the output file. 199 ** 200 ** Returns: 201 ** none 202 ** 203 ** Side Effects: 204 ** input from xfile 205 ** output to fp 206 ** 207 ** Called By: 208 ** deliver 209 */ 210 211 212 errhdr(fp) 213 register FILE *fp; 214 { 215 char buf[MAXLINE]; 216 register FILE *xfile; 217 extern int errno; 218 219 fflush(stdout); 220 if ((xfile = fopen(Transcript, "r")) == NULL) 221 syserr("Cannot open %s", Transcript); 222 errno = 0; 223 fprintf(fp, "To: %s\n", To); 224 fprintf(fp, "Subject: Unable to deliver mail\n"); 225 fprintf(fp, "\n ----- Transcript of session follows -----\n"); 226 while (fgets(xfile, buf, sizeof buf) != NULL) 227 fputs(buf, fp); 228 fprintf(fp, "\n ----- Unsent message follows -----\n"); 229 fflush(fp); 230 putmessage(fp, Mailer[1]); 231 close(xfile); 232 if (errno != 0) 233 syserr("errhdr: I/O error"); 234 } 235