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1 | /* mail-common.c - mail sending utilities | |
2 | * Copyright 2002-2004, 2007 srvx Development Team | |
3 | * | |
4 | * This file is part of srvx. | |
5 | * | |
6 | * srvx is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 3 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with srvx; if not, write to the Free Software Foundation, | |
18 | * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. | |
19 | */ | |
20 | ||
21 | #include "mail-common.c" | |
22 | ||
23 | #ifdef HAVE_SYS_WAIT_H | |
24 | #include <sys/wait.h> | |
25 | #endif | |
26 | ||
27 | /* This function sends the given "paragraph" as flowed text, as | |
28 | * defined in RFC 2646. It lets us only worry about line wrapping | |
29 | * here, and not in the code that generates mail. | |
30 | */ | |
31 | static void | |
32 | send_flowed_text(FILE *where, const char *para) | |
33 | { | |
34 | const char *eol = strchr(para, '\n'); | |
35 | unsigned int shift; | |
36 | ||
37 | while (*para) { | |
38 | /* Do we need to space-stuff the line? */ | |
39 | if ((*para == ' ') || (*para == '>') || !strncmp(para, "From ", 5)) { | |
40 | fputc(' ', where); | |
41 | shift = 1; | |
42 | } else { | |
43 | shift = 0; | |
44 | } | |
45 | /* How much can we put on this line? */ | |
46 | if (!eol && (strlen(para) < (80 - shift))) { | |
47 | /* End of paragraph; can put on one line. */ | |
48 | fputs(para, where); | |
49 | fputs("\n", where); | |
50 | break; | |
51 | } else if (eol && (eol < para + (80 - shift))) { | |
52 | /* Newline inside paragraph, no need to wrap. */ | |
53 | fprintf(where, "%.*s\n", (int)(eol - para), para); | |
54 | para = eol + 1; | |
55 | } else { | |
56 | int pos; | |
57 | /* Need to wrap. Where's the last space in the line? */ | |
58 | for (pos=72-shift; pos && (para[pos] != ' '); pos--) ; | |
59 | /* If we didn't find a space, look ahead instead. */ | |
60 | if (pos == 0) pos = strcspn(para, " \n"); | |
61 | fprintf(where, "%.*s\n", pos+1, para); | |
62 | para += pos + 1; | |
63 | } | |
64 | if (eol && (eol < para)) eol = strchr(para, '\n'); | |
65 | } | |
66 | } | |
67 | ||
68 | void | |
69 | mail_send(struct userNode *from, struct handle_info *to, const char *subject, const char *body, int first_time) | |
70 | { | |
71 | struct sigaction sv; | |
72 | pid_t child; | |
73 | int infds[2], outfds[2]; | |
74 | const char *fromaddr; | |
75 | const char *str; | |
76 | ||
77 | /* Grab some config items first. */ | |
78 | str = conf_get_data("mail/enable", RECDB_QSTRING); | |
79 | if (!str || !enabled_string(str)) | |
80 | return; | |
81 | fromaddr = conf_get_data("mail/from_address", RECDB_QSTRING); | |
82 | ||
83 | /* How this works: We fork, and the child tries to send the mail. | |
84 | * It does this by setting up a pipe pair, and forking again (the | |
85 | * grandchild exec()'s the mailer program). The mid-level child | |
86 | * sends the text to the grandchild's stdin, and then logs the | |
87 | * success or failure. | |
88 | */ | |
89 | ||
90 | child = fork(); | |
91 | if (child < 0) { | |
92 | log_module(MAIN_LOG, LOG_ERROR, "sendmail() to %s couldn't fork(): %s (%d)", to->email_addr, strerror(errno), errno); | |
93 | return; | |
94 | } else if (child > 0) { | |
95 | return; | |
96 | } | |
97 | /* Reset the SIGCHLD signal handler to the default. */ | |
98 | memset(&sv, 0, sizeof(sv)); | |
99 | sigemptyset(&sv.sa_mask); | |
100 | sv.sa_handler = SIG_DFL; | |
101 | sigaction(SIGCHLD, &sv, NULL); | |
102 | /* We're in a child now; must _exit() to die properly. */ | |
103 | if (pipe(infds) < 0) { | |
104 | log_module(MAIN_LOG, LOG_ERROR, "sendmail() child to %s couldn't pipe(infds): %s (%d)", to->email_addr, strerror(errno), errno); | |
105 | _exit(1); | |
106 | } | |
107 | if (pipe(outfds) < 0) { | |
108 | log_module(MAIN_LOG, LOG_ERROR, "sendmail() child to %s couldn't pipe(outfds): %s (%d)", to->email_addr, strerror(errno), errno); | |
109 | _exit(1); | |
110 | } | |
111 | child = fork(); | |
112 | if (child < 0) { | |
113 | log_module(MAIN_LOG, LOG_ERROR, "sendmail() child to %s couldn't fork(): %s (%d)", to->email_addr, strerror(errno), errno); | |
114 | _exit(1); | |
115 | } else if (child > 0) { | |
116 | /* Mid-level child; get ready to send the mail. */ | |
117 | FILE *out = fdopen(infds[1], "w"); | |
118 | struct string_list *extras; | |
119 | unsigned int nn; | |
120 | int res, rv; | |
121 | ||
122 | /* Close the end of pipes we do not use. */ | |
123 | close(infds[0]); | |
124 | close(outfds[1]); | |
125 | ||
126 | /* Content type? (format=flowed is a standard for plain text | |
127 | * that lets the receiver reconstruct paragraphs, defined in | |
128 | * RFC 2646. See comment above send_flowed_text() for more.) | |
129 | */ | |
130 | if (!(str = conf_get_data("mail/charset", RECDB_QSTRING))) str = "us-ascii"; | |
131 | fprintf(out, "Content-Type: text/plain; charset=%s; format=flowed\n", str); | |
132 | ||
133 | /* Send From, To and Subject headers */ | |
134 | if (!fromaddr) fromaddr = "admin@poorly.configured.network"; | |
135 | fprintf(out, "From: %s <%s>\n", from->nick, fromaddr); | |
136 | fprintf(out, "To: \"%s\" <%s>\n", to->handle, to->email_addr); | |
137 | fprintf(out, "Subject: %s\n", subject); | |
138 | ||
139 | /* Do we have any "extra" headers to send? */ | |
140 | extras = conf_get_data("mail/extra_headers", RECDB_STRING_LIST); | |
141 | if (extras) { | |
142 | for (nn=0; nn<extras->used; nn++) { | |
143 | fputs(extras->list[nn], out); | |
144 | fputs("\n", out); | |
145 | } | |
146 | } | |
147 | ||
148 | /* Send mail body */ | |
149 | fputs("\n", out); /* terminate headers */ | |
150 | extras = conf_get_data((first_time?"mail/body_prefix_first":"mail/body_prefix"), RECDB_STRING_LIST); | |
151 | if (extras) { | |
152 | for (nn=0; nn<extras->used; nn++) { | |
153 | send_flowed_text(out, extras->list[nn]); | |
154 | } | |
155 | fputs("\n", out); | |
156 | } | |
157 | send_flowed_text(out, body); | |
158 | extras = conf_get_data((first_time?"mail/body_suffix_first":"mail/body_suffix"), RECDB_STRING_LIST); | |
159 | if (extras) { | |
160 | fputs("\n", out); | |
161 | for (nn=0; nn<extras->used; nn++) | |
162 | send_flowed_text(out, extras->list[nn]); | |
163 | } | |
164 | ||
165 | /* Close file (sending mail) and check for return code */ | |
166 | fflush(out); | |
167 | fclose(out); | |
168 | do { | |
169 | rv = wait4(child, &res, 0, NULL); | |
170 | } while ((rv == -1) && (errno == EINTR)); | |
171 | if (rv == child) { | |
172 | /* accept the wait() result */ | |
173 | } else { | |
174 | log_module(MAIN_LOG, LOG_ERROR, "sendmail() child to %s: Bad wait() return code %d: %s (%d)", to->email_addr, rv, strerror(errno), errno); | |
175 | _exit(1); | |
176 | } | |
177 | if (res) { | |
178 | log_module(MAIN_LOG, LOG_ERROR, "sendmail() grandchild to %s: Exited with code %d", to->email_addr, res); | |
179 | _exit(1); | |
180 | } else { | |
181 | log_module(MAIN_LOG, LOG_INFO, "sendmail() sent email to %s <%s>: %s", to->handle, to->email_addr, subject); | |
182 | } | |
183 | _exit(0); | |
184 | } else { | |
185 | /* Grandchild; dup2 the fds and exec the mailer. */ | |
186 | const char *argv[10], *mpath; | |
187 | unsigned int argc = 0; | |
188 | ||
189 | /* Close the end of pipes we do not use. */ | |
190 | close(infds[1]); | |
191 | close(outfds[0]); | |
192 | ||
193 | dup2(infds[0], STDIN_FILENO); | |
194 | dup2(outfds[1], STDOUT_FILENO); | |
195 | mpath = conf_get_data("mail/mailer", RECDB_QSTRING); | |
196 | if (!mpath) mpath = "/usr/sbin/sendmail"; | |
197 | argv[argc++] = mpath; | |
198 | if (fromaddr) { | |
199 | argv[argc++] = "-f"; | |
200 | argv[argc++] = fromaddr; | |
201 | } | |
202 | argv[argc++] = to->email_addr; | |
203 | argv[argc++] = NULL; | |
204 | if (execv(mpath, (char**)argv) < 0) { | |
205 | log_module(MAIN_LOG, LOG_ERROR, "sendmail() grandchild to %s couldn't execv(): %s (%d)", to->email_addr, strerror(errno), errno); | |
206 | } | |
207 | _exit(1); | |
208 | } | |
209 | } | |
210 | ||
211 | void | |
212 | mail_init(void) | |
213 | { | |
214 | mail_common_init(); | |
215 | } |