1 | /* This file is part of the Project Athena Zephyr Notification System. |
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2 | * It contains code for the "zmailnotify" command. |
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3 | * |
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4 | * Created by: Robert French |
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5 | * |
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6 | * $Id: zmailnotify.c,v 1.25 1997-10-25 21:47:11 ghudson Exp $ |
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7 | * |
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8 | * Copyright (c) 1987,1993 by the Massachusetts Institute of Technology. |
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9 | * For copying and distribution information, see the file |
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10 | * "mit-copyright.h". |
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11 | */ |
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12 | |
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13 | #include <sysdep.h> |
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14 | #include <zephyr/mit-copyright.h> |
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15 | #include <zephyr/zephyr.h> |
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16 | |
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17 | #ifndef lint |
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18 | static const char rcsid_zmailnotify_c[] = |
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19 | "$Id: zmailnotify.c,v 1.25 1997-10-25 21:47:11 ghudson Exp $"; |
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20 | #endif |
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21 | |
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22 | #include <sys/socket.h> |
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23 | #include <pwd.h> |
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24 | #include <netdb.h> |
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25 | #ifdef HAVE_HESIOD |
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26 | #include <hesiod.h> |
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27 | #endif |
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28 | |
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29 | #ifndef HAVE_KRB4 |
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30 | #undef KPOP |
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31 | #endif |
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32 | |
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33 | #ifdef KPOP |
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34 | #include <krb.h> |
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35 | #endif |
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36 | |
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37 | #define NOTOK (-1) |
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38 | #define OK 0 |
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39 | #define DONE 1 |
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40 | |
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41 | FILE *sfi; |
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42 | FILE *sfo; |
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43 | char Errmsg[80]; |
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44 | |
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45 | #ifdef KPOP |
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46 | char *PrincipalHostname(); |
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47 | #endif |
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48 | |
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49 | void get_message(), pop_close(), mail_notify(), fatal_pop_err (); |
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50 | int pop_command __P((char *, ...)); |
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51 | #define MAXMAIL 4 |
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52 | |
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53 | struct _mail { |
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54 | char *from; |
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55 | char *to; |
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56 | char *subj; |
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57 | } maillist[MAXMAIL]; |
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58 | |
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59 | char *mailptr = NULL; |
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60 | char *prog = "zmailnotify"; |
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61 | |
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62 | /* This entire program is a kludge - beware! */ |
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63 | |
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64 | main(argc, argv) |
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65 | char *argv[]; |
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66 | { |
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67 | FILE *lock; |
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68 | int nmsgs; |
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69 | char *user,response[512],lockfile[100]; |
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70 | char *host,*dir; |
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71 | char *auth_cmd; |
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72 | int i,nbytes,retval,uselock; |
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73 | struct passwd *pwd; |
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74 | struct _mail mymail; |
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75 | #ifdef HAVE_HESIOD |
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76 | struct hes_postoffice *p; |
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77 | #endif |
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78 | |
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79 | if (argv[0] && *argv[0]) |
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80 | prog = argv[0]; |
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81 | |
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82 | if ((retval = ZInitialize()) != ZERR_NONE) { |
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83 | com_err(prog,retval,"while initializing"); |
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84 | exit(1); |
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85 | } |
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86 | |
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87 | dir = (char *)getenv("HOME"); |
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88 | user = (char *)getenv("USER"); |
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89 | if (!user || !dir) { |
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90 | pwd = (struct passwd *)getpwuid((int) getuid()); |
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91 | if (!pwd) { |
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92 | fprintf(stderr,"%s: Can't figure out who you are!\n", |
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93 | prog); |
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94 | exit(1); |
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95 | } |
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96 | if (!user) |
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97 | user = pwd->pw_name; |
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98 | if (!dir) |
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99 | dir = pwd->pw_dir; |
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100 | } |
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101 | if (argc > 1) |
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102 | user = argv[1]; |
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103 | |
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104 | (void) sprintf(lockfile,"%s/.maillock",dir); |
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105 | |
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106 | host = (char *)getenv("MAILHOST"); |
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107 | #ifdef HAVE_HESIOD |
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108 | if (host == NULL) { |
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109 | p = hes_getmailhost(user); |
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110 | if (p != NULL && strcmp(p->po_type, "POP") == 0) |
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111 | host = p->po_host; |
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112 | else { |
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113 | fprintf(stderr, |
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114 | "%s: no POP server listed in Hesiod for %s\n", |
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115 | prog, user); |
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116 | exit(1); |
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117 | } |
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118 | } |
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119 | #endif |
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120 | if (host == NULL) { |
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121 | fprintf(stderr,"%s: no MAILHOST defined\n", prog); |
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122 | exit(1); |
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123 | } |
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124 | |
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125 | lock = fopen(lockfile,"r+"); |
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126 | #ifdef _POSIX_VERSION |
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127 | if (lock) { |
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128 | struct flock fl; |
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129 | |
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130 | /* lock the whole file exclusively */ |
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131 | fl.l_type = F_WRLCK; |
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132 | fl.l_whence = SEEK_SET; |
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133 | fl.l_start = 0; |
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134 | fl.l_len = 0; |
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135 | (void) fcntl(fileno(lock),F_SETLKW,&fl); |
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136 | } |
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137 | #else |
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138 | if (lock) |
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139 | (void) flock(fileno(lock),LOCK_EX); |
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140 | #endif |
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141 | |
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142 | if (pop_init(host) == NOTOK) { |
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143 | fprintf(stderr,"%s: %s\n",prog, Errmsg); |
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144 | exit(1); |
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145 | } |
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146 | |
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147 | if ((getline(response, sizeof response, sfi) != OK) || |
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148 | (*response != '+')) { |
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149 | fprintf(stderr,"%s: %s\n",prog,response); |
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150 | exit(1); |
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151 | } |
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152 | |
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153 | #ifdef KPOP |
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154 | auth_cmd = "PASS %s"; |
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155 | #else |
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156 | auth_cmd = "RPOP %s"; |
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157 | #endif |
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158 | if (pop_command("USER %s", user) == NOTOK |
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159 | || pop_command(auth_cmd, user) == NOTOK) |
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160 | fatal_pop_err (); |
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161 | |
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162 | if (pop_stat(&nmsgs, &nbytes) == NOTOK) |
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163 | fatal_pop_err (); |
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164 | |
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165 | if (!nmsgs) { |
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166 | if (lock) { |
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167 | #ifdef _POSIX_VERSION |
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168 | struct flock fl; |
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169 | |
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170 | /* unlock the whole file */ |
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171 | fl.l_type = F_UNLCK; |
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172 | fl.l_whence = SEEK_SET; |
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173 | fl.l_start = 0; |
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174 | fl.l_len = 0; |
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175 | (void) fcntl(fileno(lock),F_SETLKW,&fl); |
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176 | #else |
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177 | (void) flock(fileno(lock),LOCK_UN); |
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178 | #endif |
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179 | (void) fclose(lock); |
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180 | } |
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181 | (void) unlink(lockfile); |
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182 | (void) pop_command("QUIT"); |
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183 | pop_close(); |
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184 | exit (0); |
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185 | } |
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186 | |
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187 | uselock = 0; |
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188 | if (lock) { |
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189 | uselock = 1; |
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190 | mymail.to = (char *)malloc(BUFSIZ); |
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191 | mymail.from = (char *)malloc(BUFSIZ); |
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192 | mymail.subj = (char *)malloc(BUFSIZ); |
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193 | if (fgets(mymail.from,BUFSIZ,lock) != NULL) |
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194 | mymail.from[strlen(mymail.from)-1] = 0; |
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195 | else |
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196 | mymail.from[0]=0; |
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197 | if (fgets(mymail.to,BUFSIZ,lock) != NULL) |
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198 | mymail.to[strlen(mymail.to)-1] = 0; |
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199 | else |
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200 | mymail.to[0] = 0; |
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201 | if (fgets(mymail.subj,BUFSIZ,lock) != NULL) |
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202 | mymail.subj[strlen(mymail.subj)-1] = 0; |
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203 | else |
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204 | mymail.subj[0] = 0; |
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205 | } |
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206 | else { |
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207 | lock = fopen(lockfile,"w"); |
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208 | #ifdef _POSIX_VERSION |
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209 | if (lock) { |
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210 | struct flock fl; |
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211 | |
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212 | /* lock the whole file exclusively */ |
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213 | fl.l_type = F_WRLCK; |
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214 | fl.l_whence = SEEK_SET; |
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215 | fl.l_start = 0; |
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216 | fl.l_len = 0; |
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217 | (void) fcntl(fileno(lock),F_SETLKW,&fl); |
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218 | } |
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219 | #else |
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220 | if (lock) |
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221 | (void) flock(fileno(lock),LOCK_EX); |
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222 | #endif |
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223 | uselock = 0; |
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224 | } |
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225 | |
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226 | for (i=nmsgs;i>0;i--) { |
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227 | if (nmsgs-i == MAXMAIL) |
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228 | break; |
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229 | if (get_mail(i,&maillist[nmsgs-i])) |
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230 | exit (1); |
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231 | if (uselock && (!strcmp(maillist[nmsgs-i].to,mymail.to) && |
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232 | !strcmp(maillist[nmsgs-i].from,mymail.from) && |
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233 | !strcmp(maillist[nmsgs-i].subj,mymail.subj))) |
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234 | break; |
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235 | } |
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236 | |
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237 | (void) pop_command("QUIT"); |
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238 | pop_close(); |
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239 | |
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240 | i++; |
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241 | for (;i<=nmsgs;i++) |
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242 | mail_notify(&maillist[nmsgs-i]); |
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243 | i--; |
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244 | if (lock) { |
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245 | #ifdef _POSIX_VERSION |
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246 | struct flock fl; |
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247 | |
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248 | /* unlock the whole file */ |
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249 | fl.l_type = F_UNLCK; |
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250 | fl.l_whence = SEEK_SET; |
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251 | fl.l_start = 0; |
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252 | fl.l_len = 0; |
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253 | (void) fcntl(fileno(lock),F_SETLKW,&fl); |
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254 | #else |
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255 | (void) flock(fileno(lock),LOCK_UN); |
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256 | #endif |
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257 | (void) fclose(lock); |
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258 | } |
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259 | lock = fopen(lockfile,"w"); |
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260 | if (!lock) |
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261 | exit (1); |
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262 | fprintf(lock,"%s\n%s\n%s\n", |
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263 | maillist[nmsgs-i].from, |
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264 | maillist[nmsgs-i].to, |
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265 | maillist[nmsgs-i].subj); |
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266 | (void) fclose(lock); |
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267 | |
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268 | exit(0); |
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269 | } |
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270 | |
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271 | void fatal_pop_err () |
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272 | { |
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273 | fprintf (stderr, "%s: %s\n", prog, Errmsg); |
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274 | (void) pop_command ("QUIT"); |
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275 | pop_close (); |
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276 | exit (1); |
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277 | } |
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278 | |
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279 | void get_message(i) |
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280 | int i; |
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281 | { |
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282 | int mbx_write(); |
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283 | if (pop_scan(i, mbx_write, 0) != OK) |
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284 | fatal_pop_err (); |
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285 | } |
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286 | |
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287 | /* Pop stuff */ |
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288 | |
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289 | void pop_close() |
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290 | { |
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291 | if (sfi) |
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292 | (void) fclose(sfi); |
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293 | if (sfo) |
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294 | (void) fclose(sfo); |
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295 | } |
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296 | |
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297 | get_mail(i,mail) |
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298 | int i; |
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299 | struct _mail *mail; |
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300 | { |
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301 | char from[512],to[512],subj[512]; |
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302 | char *c,*ptr,*ptr2; |
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303 | |
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304 | *from = 0; |
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305 | *to = 0; |
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306 | *subj = 0; |
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307 | |
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308 | if (mailptr) |
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309 | free(mailptr); |
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310 | |
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311 | mailptr = 0; |
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312 | |
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313 | get_message(i); |
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314 | |
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315 | ptr = mailptr; |
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316 | while (ptr) { |
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317 | ptr2 = strchr(ptr,'\n'); |
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318 | if (ptr2) |
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319 | *ptr2++ = 0; |
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320 | if (*ptr == '\0') |
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321 | break; |
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322 | if (!strncmp(ptr, "From: ", 6)) |
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323 | (void) strcpy(from, ptr+6); |
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324 | else if (!strncmp(ptr, "To: ", 4)) |
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325 | (void) strcpy(to, ptr+4); |
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326 | else if (!strncmp(ptr, "Subject: ", 9)) |
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327 | (void) strcpy(subj, ptr+9); |
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328 | ptr = ptr2; |
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329 | } |
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330 | |
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331 | /* add elipsis at end of "To:" field if it continues onto */ |
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332 | /* more than one line */ |
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333 | i = strlen(to) - 2; |
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334 | c = to+i; |
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335 | if (*c++ == ',') { |
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336 | *c++ = ' '; |
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337 | *c++ = '.'; |
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338 | *c++ = '.'; |
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339 | *c++ = '.'; |
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340 | *c++ = '\n'; |
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341 | *c = 0; |
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342 | } |
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343 | |
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344 | mail->from = (char *)malloc((unsigned)(strlen(from)+1)); |
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345 | (void) strcpy(mail->from,from); |
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346 | mail->to = (char *)malloc((unsigned)(strlen(to)+1)); |
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347 | (void) strcpy(mail->to,to); |
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348 | mail->subj = (char *)malloc((unsigned)(strlen(subj)+1)); |
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349 | (void) strcpy(mail->subj,subj); |
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350 | |
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351 | return (0); |
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352 | } |
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353 | |
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354 | void |
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355 | mail_notify(mail) |
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356 | struct _mail *mail; |
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357 | { |
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358 | int retval; |
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359 | char *fields[3]; |
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360 | ZNotice_t notice; |
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361 | |
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362 | (void) memset((char *)¬ice, 0, sizeof(notice)); |
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363 | notice.z_kind = UNACKED; |
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364 | notice.z_port = 0; |
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365 | notice.z_class = "MAIL"; |
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366 | notice.z_class_inst = "POPRET"; |
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367 | notice.z_opcode = "NEW_MAIL"; |
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368 | notice.z_sender = 0; |
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369 | notice.z_recipient = ZGetSender(); |
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370 | notice.z_default_format = "You have new mail:\n\nFrom: $1\nTo: $2\nSubject: $3"; |
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371 | |
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372 | fields[0] = mail->from; |
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373 | fields[1] = mail->to; |
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374 | fields[2] = mail->subj; |
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375 | |
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376 | if ((retval = ZSendList(¬ice,fields,3,ZNOAUTH)) != ZERR_NONE) |
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377 | com_err(prog,retval,"while sending notice"); |
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378 | } |
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379 | |
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380 | /* |
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381 | * These are the necessary KPOP routines snarfed from |
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382 | * the GNU movemail program. |
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383 | */ |
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384 | |
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385 | pop_init(host) |
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386 | char *host; |
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387 | { |
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388 | register struct hostent *hp; |
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389 | register struct servent *sp; |
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390 | int lport = IPPORT_RESERVED - 1; |
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391 | struct sockaddr_in sin; |
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392 | register int s; |
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393 | #ifdef KPOP |
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394 | KTEXT ticket = (KTEXT)NULL; |
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395 | int rem; |
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396 | long authopts; |
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397 | char *host_save; |
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398 | #endif |
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399 | char *svc_name; |
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400 | |
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401 | hp = gethostbyname(host); |
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402 | if (hp == NULL) { |
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403 | (void) sprintf(Errmsg, "MAILHOST unknown: %s", host); |
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404 | return(NOTOK); |
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405 | } |
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406 | |
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407 | |
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408 | #ifdef KPOP |
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409 | #ifdef ATHENA_COMPAT |
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410 | svc_name = "knetd"; |
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411 | #else |
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412 | svc_name = "kpop"; |
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413 | #endif |
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414 | #else |
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415 | svc_name = "pop"; |
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416 | #endif |
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417 | |
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418 | sp = getservbyname (svc_name, "tcp"); |
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419 | if (sp == 0) { |
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420 | (void) sprintf (Errmsg, "%s/tcp: unknown service", svc_name); |
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421 | return NOTOK; |
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422 | } |
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423 | sin.sin_family = hp->h_addrtype; |
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424 | (void) memcpy((char *)&sin.sin_addr, hp->h_addr, hp->h_length); |
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425 | sin.sin_port = sp->s_port; |
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426 | #ifdef KPOP |
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427 | s = socket(AF_INET, SOCK_STREAM, 0); |
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428 | #else |
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429 | s = rresvport(&lport); |
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430 | #endif |
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431 | if (s < 0) { |
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432 | (void) sprintf(Errmsg, "error creating socket: %s", strerror(errno)); |
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433 | return(NOTOK); |
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434 | } |
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435 | |
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436 | if (connect(s, (struct sockaddr *)&sin, sizeof sin) < 0) { |
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437 | (void) sprintf(Errmsg, "error during connect: %s", strerror(errno)); |
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438 | (void) close(s); |
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439 | return(NOTOK); |
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440 | } |
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441 | #ifdef KPOP |
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442 | ticket = (KTEXT)malloc( sizeof(KTEXT_ST) ); |
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443 | rem=KSUCCESS; |
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444 | #ifdef ATHENA_COMPAT |
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445 | authopts = KOPT_DO_OLDSTYLE; |
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446 | rem = krb_sendsvc(s,"pop"); |
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447 | if (rem != KSUCCESS) { |
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448 | (void) sprintf(Errmsg, "kerberos error: %s", krb_get_err_text(rem)); |
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449 | (void) close(s); |
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450 | return(NOTOK); |
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451 | } |
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452 | #else |
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453 | authopts = 0L; |
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454 | #endif |
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455 | host_save = malloc(strlen(hp->h_name) + 1); |
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456 | if (!host_save) { |
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457 | sprintf(Errmsg, "Out of memory."); |
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458 | return(NOTOK); |
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459 | } |
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460 | strcpy(host_save, hp->h_name); |
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461 | rem = krb_sendauth(authopts, s, ticket, "pop", host_save, (char *)0, |
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462 | 0, (MSG_DAT *) 0, (CREDENTIALS *) 0, |
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463 | (bit_64 *) 0, (struct sockaddr_in *)0, |
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464 | (struct sockaddr_in *)0,"ZMAIL0.0"); |
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465 | free(host_save); |
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466 | free(ticket); |
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467 | if (rem != KSUCCESS) { |
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468 | (void) sprintf(Errmsg, "kerberos error: %s",krb_get_err_text(rem)); |
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469 | (void) close(s); |
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470 | return(NOTOK); |
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471 | } |
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472 | #endif |
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473 | |
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474 | sfi = fdopen(s, "r"); |
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475 | sfo = fdopen(s, "w"); |
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476 | if (sfi == NULL || sfo == NULL) { |
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477 | (void) sprintf(Errmsg, "error in fdopen: %s", strerror(errno)); |
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478 | (void) close(s); |
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479 | return(NOTOK); |
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480 | } |
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481 | |
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482 | return(OK); |
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483 | } |
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484 | |
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485 | #ifdef __STDC__ |
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486 | pop_command(char *fmt, ...) |
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487 | #else |
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488 | pop_command(fmt, va_alist) |
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489 | va_dcl |
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490 | #endif |
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491 | { |
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492 | va_list args; |
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493 | char buf[4096]; |
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494 | |
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495 | VA_START(args, fmt); |
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496 | (void) vsprintf(buf, fmt, args); |
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497 | va_end(args); |
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498 | |
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499 | if (putline(buf, Errmsg, sfo) == NOTOK) return(NOTOK); |
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500 | |
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501 | if (getline(buf, sizeof buf, sfi) != OK) { |
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502 | (void) strcpy(Errmsg, buf); |
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503 | return(NOTOK); |
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504 | } |
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505 | |
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506 | if (*buf != '+') { |
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507 | (void) strcpy(Errmsg, buf); |
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508 | return(NOTOK); |
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509 | } else { |
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510 | return(OK); |
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511 | } |
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512 | } |
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513 | |
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514 | |
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515 | pop_stat(nmsgs, nbytes) |
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516 | int *nmsgs, *nbytes; |
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517 | { |
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518 | char buf[4096]; |
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519 | |
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520 | if (putline("STAT", Errmsg, sfo) == NOTOK) return(NOTOK); |
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521 | |
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522 | if (getline(buf, sizeof buf, sfi) != OK) { |
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523 | (void) strcpy(Errmsg, buf); |
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524 | return(NOTOK); |
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525 | } |
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526 | |
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527 | if (*buf != '+') { |
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528 | (void) strcpy(Errmsg, buf); |
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529 | return(NOTOK); |
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530 | } else { |
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531 | if (sscanf(buf, "+OK %d %d", nmsgs, nbytes) != 2) |
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532 | return(NOTOK); |
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533 | return(OK); |
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534 | } |
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535 | } |
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536 | |
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537 | pop_scan(msgno, action, arg) |
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538 | int (*action)(); |
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539 | { |
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540 | char buf[4096]; |
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541 | |
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542 | #ifdef HAVE_POP3_TOP |
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543 | (void) sprintf(buf, "TOP %d 0", msgno); |
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544 | #else |
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545 | (void) sprintf(buf, "RETR %d", msgno); |
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546 | #endif |
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547 | if (putline(buf, Errmsg, sfo) == NOTOK) return(NOTOK); |
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548 | |
---|
549 | if (getline(buf, sizeof buf, sfi) != OK) { |
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550 | (void) strcpy(Errmsg, buf); |
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551 | return(NOTOK); |
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552 | } |
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553 | |
---|
554 | while (1) { |
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555 | switch (multiline(buf, sizeof buf, sfi)) { |
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556 | case OK: |
---|
557 | (*action)(buf, arg); |
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558 | break; |
---|
559 | case DONE: |
---|
560 | return (OK); |
---|
561 | case NOTOK: |
---|
562 | (void) strcpy(Errmsg, buf); |
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563 | return (NOTOK); |
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564 | } |
---|
565 | } |
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566 | } |
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567 | |
---|
568 | getline(buf, n, f) |
---|
569 | char *buf; |
---|
570 | register int n; |
---|
571 | FILE *f; |
---|
572 | { |
---|
573 | register char *p; |
---|
574 | |
---|
575 | p = fgets(buf, n, f); |
---|
576 | |
---|
577 | if (ferror(f)) { |
---|
578 | (void) strcpy(buf, "error on connection"); |
---|
579 | return (NOTOK); |
---|
580 | } |
---|
581 | |
---|
582 | if (p == NULL) { |
---|
583 | (void) strcpy(buf, "connection closed by foreign host\n"); |
---|
584 | return (DONE); |
---|
585 | } |
---|
586 | |
---|
587 | p = buf + strlen(buf); |
---|
588 | if (*--p == '\n') *p = '\0'; |
---|
589 | if (*--p == '\r') *p = '\0'; |
---|
590 | return(OK); |
---|
591 | } |
---|
592 | |
---|
593 | multiline(buf, n, f) |
---|
594 | char *buf; |
---|
595 | register int n; |
---|
596 | FILE *f; |
---|
597 | { |
---|
598 | if (getline(buf, n, f) != OK) return (NOTOK); |
---|
599 | if (*buf == '.') { |
---|
600 | if (*(buf+1) == '\0') { |
---|
601 | return (DONE); |
---|
602 | } else { |
---|
603 | (void) strcpy(buf, buf+1); |
---|
604 | } |
---|
605 | } else if (*buf == '\0') { |
---|
606 | /* suck up all future lines, since this is after all only for headers */ |
---|
607 | while(! ((buf[0]=='.') && (buf[1] == '\0')) ) { |
---|
608 | if (getline(buf, n, f) != OK) return (NOTOK); |
---|
609 | } |
---|
610 | return DONE; |
---|
611 | } |
---|
612 | return(OK); |
---|
613 | } |
---|
614 | |
---|
615 | putline(buf, err, f) |
---|
616 | char *buf; |
---|
617 | char *err; |
---|
618 | FILE *f; |
---|
619 | { |
---|
620 | fprintf(f, "%s\r\n", buf); |
---|
621 | (void) fflush(f); |
---|
622 | if (ferror(f)) { |
---|
623 | (void) strcpy(err, "lost connection"); |
---|
624 | return(NOTOK); |
---|
625 | } |
---|
626 | return(OK); |
---|
627 | } |
---|
628 | |
---|
629 | /*ARGSUSED*/ |
---|
630 | mbx_write(line, dummy) |
---|
631 | char *line; |
---|
632 | int dummy; /* for consistency with pop_scan */ |
---|
633 | { |
---|
634 | if (mailptr) { |
---|
635 | mailptr = (char *)realloc(mailptr,(unsigned)(strlen(mailptr)+strlen(line)+2)); |
---|
636 | (void) strcat(mailptr,line); |
---|
637 | } |
---|
638 | else { |
---|
639 | mailptr = (char *)malloc((unsigned)(strlen(line)+2)); |
---|
640 | (void) strcpy(mailptr,line); |
---|
641 | } |
---|
642 | (void) strcat(mailptr,"\n"); |
---|
643 | return(0); |
---|
644 | } |
---|