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Commit | Line | Data |
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fa59b86f | 1 | /* $Id$ |
ca401c43 | 2 | * |
7ac48069 | 3 | * Pass an mr_params off to the Moira server and get a reply |
4 | * | |
5 | * Copyright (C) 1987-1998 by the Massachusetts Institute of Technology | |
6 | * For copying and distribution information, please see the file | |
7 | * <mit-copyright.h>. | |
ca401c43 | 8 | */ |
9 | ||
babbc197 | 10 | #include <mit-copyright.h> |
7ac48069 | 11 | #include <moira.h> |
8defc06b | 12 | #include "mr_private.h" |
ca401c43 | 13 | |
85330553 | 14 | #include <errno.h> |
85330553 | 15 | #include <stdlib.h> |
16 | #include <string.h> | |
533bacb3 | 17 | #ifndef _WIN32 |
18 | #include <netinet/in.h> | |
19 | #endif /* _WIN32 */ | |
20 | ||
21 | #ifdef HAVE_UNISTD_H | |
85330553 | 22 | #include <unistd.h> |
533bacb3 | 23 | #endif |
85330553 | 24 | |
7ac48069 | 25 | RCSID("$Header$"); |
26 | ||
85330553 | 27 | /* Moira RPC format: |
28 | ||
29 | 4-byte total length (including these 4 bytes) | |
30 | 4-byte version number (MR_VERSION_2 == 2) | |
31 | 4-byte opcode (from client) or status (from server) | |
32 | 4-byte argc | |
33 | ||
34 | 4-byte len, followed by null-terminated string, padded to 4-byte boundary | |
35 | (the len doesn't include the padding) | |
36 | ... | |
37 | ||
38 | (followed by more packets if status was MR_MORE_DATA) | |
39 | ||
40 | All numbers are in network byte order. | |
41 | */ | |
42 | ||
43 | int mr_do_call(struct mr_params *params, struct mr_params *reply) | |
ca401c43 | 44 | { |
85330553 | 45 | int status; |
46 | ||
5eaef520 | 47 | CHECK_CONNECTED; |
48 | ||
85330553 | 49 | status = mr_send(_mr_conn, params); |
50 | if (status == MR_SUCCESS) | |
51 | status = mr_receive(_mr_conn, reply); | |
52 | ||
53 | if (status) | |
54 | mr_disconnect(); | |
55 | ||
56 | return status; | |
57 | } | |
58 | ||
59 | int mr_send(int fd, struct mr_params *params) | |
60 | { | |
533bacb3 | 61 | u_long length; |
62 | int written; | |
85330553 | 63 | int i, *argl; |
64 | char *buf, *p; | |
65 | ||
66 | length = 16; /* length + version + opcode/status + argc */ | |
67 | ||
68 | if (params->mr_argl) | |
69 | { | |
70 | argl = params->mr_argl; | |
71 | for (i = 0; i < params->mr_argc; i++) | |
72 | length += 8 + argl[i]; | |
73 | } | |
74 | else | |
75 | { | |
76 | argl = malloc(params->mr_argc * sizeof(int)); | |
77 | if (params->mr_argc && !argl) | |
78 | return ENOMEM; | |
79 | for (i = 0; i < params->mr_argc; i++) | |
80 | { | |
81 | argl[i] = strlen(params->mr_argv[i]) + 1; | |
82 | length += 8 + argl[i]; | |
83 | } | |
84 | } | |
85 | ||
86 | buf = malloc(length); | |
87 | if (!buf) | |
88 | { | |
89 | if (!params->mr_argl) | |
90 | free(argl); | |
91 | return ENOMEM; | |
92 | } | |
93 | memset(buf, 0, length); | |
94 | ||
95 | putlong(buf + 4, MR_VERSION_2); | |
96 | putlong(buf + 8, params->u.mr_procno); | |
97 | putlong(buf + 12, params->mr_argc); | |
5eaef520 | 98 | |
85330553 | 99 | for (i = 0, p = buf + 16; i < params->mr_argc; i++) |
100 | { | |
101 | putlong(p, argl[i]); | |
102 | memcpy(p += 4, params->mr_argv[i], argl[i]); | |
103 | p += argl[i] + (4 - argl[i] % 4) % 4; | |
104 | } | |
105 | length = p - buf; | |
106 | putlong(buf, length); | |
107 | ||
533bacb3 | 108 | written = send(fd, buf, length, 0); |
85330553 | 109 | free(buf); |
110 | if (!params->mr_argl) | |
111 | free(argl); | |
5eaef520 | 112 | |
533bacb3 | 113 | if (written != (int)length) |
85330553 | 114 | return MR_ABORTED; |
115 | else | |
116 | return MR_SUCCESS; | |
117 | } | |
118 | ||
119 | int mr_receive(int fd, struct mr_params *reply) | |
12cbd6bd | 120 | { |
121 | int status; | |
122 | ||
123 | memset(reply, 0, sizeof(struct mr_params)); | |
124 | do | |
125 | status = mr_cont_receive(fd, reply); | |
126 | while (status == -1); | |
127 | ||
128 | return status; | |
129 | } | |
130 | ||
456d95f6 | 131 | /* Read some or all of a client response, without losing if it turns |
132 | * out to be malformed. Returns MR_SUCCESS on success, an error code | |
133 | * on failure, or -1 if the packet hasn't been completely received | |
134 | * yet. | |
135 | */ | |
533bacb3 | 136 | |
12cbd6bd | 137 | int mr_cont_receive(int fd, struct mr_params *reply) |
85330553 | 138 | { |
139 | u_long length, data; | |
533bacb3 | 140 | int size, more; |
456d95f6 | 141 | char *p, *end; |
85330553 | 142 | int i; |
5eaef520 | 143 | |
85330553 | 144 | if (!reply->mr_flattened) |
85330553 | 145 | { |
12cbd6bd | 146 | char lbuf[4]; |
147 | ||
533bacb3 | 148 | size = recv(fd, lbuf, 4, 0); |
12cbd6bd | 149 | if (size != 4) |
150 | return size ? MR_ABORTED : MR_NOT_CONNECTED; | |
151 | getlong(lbuf, length); | |
456d95f6 | 152 | if (length > 8192) |
153 | return MR_INTERNAL; | |
12cbd6bd | 154 | reply->mr_flattened = malloc(length); |
155 | if (!reply->mr_flattened) | |
156 | return ENOMEM; | |
157 | memcpy(reply->mr_flattened, lbuf, 4); | |
158 | reply->mr_filled = 4; | |
159 | ||
160 | return -1; | |
85330553 | 161 | } |
12cbd6bd | 162 | else |
163 | getlong(reply->mr_flattened, length); | |
164 | ||
533bacb3 | 165 | more = recv(fd, reply->mr_flattened + reply->mr_filled, |
166 | length - reply->mr_filled, 0); | |
12cbd6bd | 167 | if (more == -1) |
5eaef520 | 168 | { |
85330553 | 169 | mr_destroy_reply(*reply); |
5eaef520 | 170 | return MR_ABORTED; |
83e80378 | 171 | } |
85330553 | 172 | |
12cbd6bd | 173 | reply->mr_filled += more; |
456d95f6 | 174 | |
12cbd6bd | 175 | if (reply->mr_filled != length) |
176 | return -1; | |
177 | ||
178 | getlong(reply->mr_flattened + 4, data); | |
85330553 | 179 | if (data != MR_VERSION_2) |
180 | { | |
181 | mr_destroy_reply(*reply); | |
182 | return MR_VERSION_MISMATCH; | |
183 | } | |
184 | ||
12cbd6bd | 185 | getlong(reply->mr_flattened + 8, reply->u.mr_status); |
186 | getlong(reply->mr_flattened + 12, reply->mr_argc); | |
533bacb3 | 187 | if (reply->mr_argc > ((int)length - 16) / 8) |
456d95f6 | 188 | { |
189 | mr_destroy_reply(*reply); | |
190 | return MR_INTERNAL; | |
191 | } | |
85330553 | 192 | reply->mr_argv = malloc(reply->mr_argc * sizeof(char *)); |
193 | reply->mr_argl = malloc(reply->mr_argc * sizeof(int)); | |
194 | if (reply->mr_argc && (!reply->mr_argv || !reply->mr_argl)) | |
195 | { | |
196 | mr_destroy_reply(*reply); | |
197 | return ENOMEM; | |
198 | } | |
199 | ||
456d95f6 | 200 | p = (char *)reply->mr_flattened + 16; |
201 | end = (char *)reply->mr_flattened + length; | |
202 | for (i = 0; i < reply->mr_argc && p + 4 <= end; i++) | |
85330553 | 203 | { |
204 | getlong(p, reply->mr_argl[i]); | |
456d95f6 | 205 | if (p + 4 + reply->mr_argl[i] > end) |
206 | break; | |
85330553 | 207 | reply->mr_argv[i] = p + 4; |
208 | p += 4 + reply->mr_argl[i] + (4 - reply->mr_argl[i] % 4) % 4; | |
209 | } | |
210 | ||
456d95f6 | 211 | if (i != reply->mr_argc) |
212 | { | |
213 | mr_destroy_reply(*reply); | |
214 | return MR_INTERNAL; | |
215 | } | |
216 | ||
85330553 | 217 | return MR_SUCCESS; |
218 | } | |
219 | ||
220 | void mr_destroy_reply(mr_params reply) | |
221 | { | |
222 | free(reply.mr_argl); | |
223 | free(reply.mr_argv); | |
224 | free(reply.mr_flattened); | |
ca401c43 | 225 | } |